Combination Patents (Class 203/DIG16)
  • Patent number: 5874575
    Abstract: An improved process for the preparation of caprolactam by heating 6-aminocapronitrile in the presence of a heterogenous catalyst and water under superatmospheric pressure without rapid deactivation of the catalysts used. The process further includes the addition of a low or high boiling alcohol in the heating phase, after which the products are obtained by distillation. The process further includes a method of working up the top and bottom products of the reactors to achieve higher yields.
    Type: Grant
    Filed: October 3, 1996
    Date of Patent: February 23, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Eberhard Fuchs, Guenther Achhammer
  • Patent number: 5868906
    Abstract: A method for the on-site reprocessing of isopropyl alcohol used in semiconductor manufacturing, to generate an ultradry and ultrapure isopropyl alcohol. This ultradry and ultrapure isopropyl alcohol is produced through a pervaporation step, followed by double distillation. In the first distillation step, an autonomous azeotropic self-stripping distillation column is used to produce an ultradry and partially purified isopropyl alcohol. In the next step, the isopropyl alcohol is distilled in an overhead product distillation column, to produce an ultrapure and ultradry isopropyl alcohol. Alternatively, if the feed isopropyl alcohol contains less than 2000 ppm water, the pervaporation step may be omitted.The resulting isopropyl alcohol has between a high of 100 parts per million (ppm) and a low of 0.1 ppm of water in the isopropyl alcohol. It also has zero particles per milliliter of a size larger than 2.0 microns, zero to 2 particles per milliliter of a size of 0.5 micron to 2.
    Type: Grant
    Filed: August 2, 1996
    Date of Patent: February 9, 1999
    Assignee: Athens Corporation
    Inventors: John A. Adams, Gerald A. Krulik, Christopher Blatt, David Persichini
  • Patent number: 5744010
    Abstract: The invention relates to a process for the preparation of acesulfam salts by reaction of salts of amidosulfonic acid with diketene to give a salt of acetoacetamidosulfonic acid (I), ring closure by the action of at least about an equivalent amount of SO.sub.3, at least this ring closure reaction being carried out in the presence of a halogenated, aliphatic hydrocarbon as an inert solvent, treatment of the cyclization product with water and conversion of the resulting acesulfam-H (II) into the form of a non-toxic salt, which comprises, in the work-up by distillation of the resulting crude solvent, after removal of water and low-boilers and recovery of solvent sufficiently pure for reuse in the preparation of compounds (I) and/or (II), directly returning :he remaining, solvent-containing distillation residue, without further purification, into the system downstream of the reaction vessel for carrying out the ring closure reaction.
    Type: Grant
    Filed: June 19, 1995
    Date of Patent: April 28, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gunter Roscher, Heinz Litterer, Axel Engelmann, Wolf-Dietmar Kaufmann, Bernd Laugwitz, Hans-Dietmar Schnabel
  • Patent number: 5681433
    Abstract: A process for the dehydration of a vaporous mixture. The basic process involves directing a predominantly condensable water vapor-containing vaporous mixture against the feed side of a membrane while maintaining the feed near saturation without condensing it, directing a condensable vapor sweep stream past the permeate side of the membrane in a countercurrent flow, thereby transporting water vapor in the vaporous mixture from the feed side to the permeate side of the membrane to form a noncondensed combined permeate side mixture of condensable vapor and transported water vapor.
    Type: Grant
    Filed: September 14, 1994
    Date of Patent: October 28, 1997
    Assignee: Bend Research, Inc.
    Inventors: Dwayne T. Friesen, David D. Newbold, Scott B. McCray, Roderick J. Ray
  • Patent number: 5676801
    Abstract: A radial-inflow large volume-rate low pressure-differential, single-stage compressor comprising 2 periphiral concentric sets of axial blades spaced circumferentially between two supporting rings and further strengthened against bending by intermediate rings if necessary. The outer set of blades rotates to impart energy to the working fluid and the inner set is stationary to recover kinetic energy. Stationary guide surfaces concentric with the blades direct the radially inward flow to axial. A diverging duct recovers further the kinetic energy. The compressor fills the pressure-ratio gap between blowers and turbo-compressors. Its use in desalination instead of the currently used centrifugal compressors, can scale-up the vapor-compression unit-size to more than three fold.
    Type: Grant
    Filed: February 6, 1995
    Date of Patent: October 14, 1997
    Inventor: Yehia El-Sayed
  • Patent number: 5637777
    Abstract: The invention concerns a process and an apparatus for preparing tertiary ethers. According to the process, C.sub.4 to C.sub.6 isoolefins and possibly heavier olefins contained in the feedstock are reacted with lower aliphatic alcohols, in particular methanol or ethanol, in a catalytic distillation reactor system in order to produce the corresponding ethers. According to the invention, the reaction between the isoolefins and the alcohols is essentially carried out in at least one reactor (5-7) of the kind, which is combined with a distillation column (3) intended for product separation, by conducting at least a part of the liquid flow of the column through the reactor and returning it to a lower tray than the one from which it was taken. At least half of cation exchange resin is placed in the side reactor (5-7). In the process according to the invention, the catalyst can be rapidly changed without stopping the process.
    Type: Grant
    Filed: September 16, 1994
    Date of Patent: June 10, 1997
    Assignee: Neste OY
    Inventors: Juhani Aittamaa, Isto Eilos, Juha Jakkula, Petri Lindqvist
  • Patent number: 5612007
    Abstract: An apparatus useful for preparing aromatic carboxylic acids by the exothermic liquid-phase oxidation reaction of an aromatic feedstock compound is disclosed, wherein energy is efficiently recovered from the exothermic oxidation reaction.
    Type: Grant
    Filed: May 22, 1995
    Date of Patent: March 18, 1997
    Assignee: Amoco Corporation
    Inventor: Kenneth J. Abrams
  • Patent number: 5609733
    Abstract: System and method for treating toxic washwater from ink, paint, pesticides and the like. The wash water is heated to a temperature on the order of 100.degree. F. in a sump positioned beneath a bed of horse manure media containing aerobic fungi and bacteria. Washwater is foam lifted from the sump to a level above the media and allowed to filter down through the media. Hot dry air is blown into the media from the side to maintain the media at a temperature on the order of 100.degree. F. and thereby promote microbiological activity and evaporation of the water in the media. Warm moist air from the media is cooled to condense the moisture, and the condensed moisture is collected as distilled water. A prefilter removes excessive amounts of solids from the washwater before it is introduced into the sump, and a Carnot cycle system provides the necessary heating and cooling for the water, media and air.
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: March 11, 1997
    Assignee: Advanced Bio-Gest, Inc.
    Inventor: R. Edward Burton
  • Patent number: 5607557
    Abstract: A process for separating a mixture containing mainly ethyl tertio-butyl ether (ETBE), ethanol and C.sub.4 hydrocarbons includes introducing the mixture to be separated into a debutanizer from which the C.sub.4 hydrocarbons are recovered overhead with a fraction of the ethanol, and purified ETBE is recovered as a bottom product; a side stream of an ethanol-rich phase is extracted and sent to a permeation zone in which the dense film of the membrane is constituted by a N,N-dimethylaminoethyl methacrylate polymer (DMAEMA) or a copolymer of DMAEMA with N-vinylcaprolactam (NVCL) and/or with N-vinyl pyrrolidone (NVP); the ethanol-depleted retentate from this permeation zone is returned to the debutanizer and the permeate contains mainly separated ethanol.The process can be integrated into an ETBE production process, in which the ethanol separated during the permeation step is recycled to the etherification reactor. The debutanizer may be replaced by a catalytic distillation column.
    Type: Grant
    Filed: March 28, 1995
    Date of Patent: March 4, 1997
    Assignee: Institut Francais du Petrole
    Inventor: Christian Streicher
  • Patent number: 5591311
    Abstract: A process for purifying impure 2,6-diisopropylphenol (DIP) mixtures having lower and higher boiling phenolic impurities is described. The process involves washing the mixture with aqueous alkali metal hydroxide solution in an inert atmosphere and separating the aqueous and organic phases, washing the resulting organic phase with water, and then subjecting the water-washed organic phase to distillation in an inert environment to recover purified DIP. Since only one distillation is required rather than two, the development of impurities in the DIP caused by in situ oxidation reactions at elevated temperatures due to the inevitable presence of traces of air in commercial distillation facilities is reduced to acceptable levels.
    Type: Grant
    Filed: October 26, 1995
    Date of Patent: January 7, 1997
    Assignee: Albemarle Corporation
    Inventor: Venkataraman Ramachandran
  • Patent number: 5582692
    Abstract: A method for the separation and purification in a single pass of a heat or oxygen-sensitive liquid feed, such as a plant derived liquid feed mixture of fatty acids, tocopherol compounds and sterols, into a low boiling point purified fraction of Vitamin E tocopherol compounds and a high boiling point concentrate fraction of triglycerides, which method can be maintained in the presence of an inert gas to provide reduced degradation and increased purity of the Vitamin E fraction.
    Type: Grant
    Filed: October 7, 1994
    Date of Patent: December 10, 1996
    Assignee: Artisan Industries, Inc.
    Inventor: James L. Baird
  • Patent number: 5582691
    Abstract: An improved ocean thermal energy conversion (OTEC) system which includes a novel combined evaporator/condenser. The combined evaporator/condenser further includes a plurality of evaporator spouts and a mist eliminator, wherein the pressure is maintained across the plurality of evaporator spouts. The OTEC system also generates fresh water as a primary product and generates only enough electricity, as a secondary product, to operate the OTEC system itself.
    Type: Grant
    Filed: December 14, 1993
    Date of Patent: December 10, 1996
    Inventors: Robert J. Flynn, George J. Cicchetti, Jonathan d'E. Coony
  • Patent number: 5552024
    Abstract: A process for making and purifying dipropylene glycol tert-butyl ethers (DPTB). DPTB is made by reacting dipropylene glycol with isobutylene in the presence of an acidic catalyst. Extractive distillation of the product mixture using a glycol extracting agent, preferably dipropylene glycol, allows removal of di-tert-butyl ether impurities as an overhead product. The DPTB product is then distilled to separate it from the glycol extracting agent. High-purity DPTB, substantially free of diethers and exceptionally useful as a solvent, is obtained from the process.
    Type: Grant
    Filed: February 28, 1994
    Date of Patent: September 3, 1996
    Assignee: ARCO Chemical Technology, L.P.
    Inventors: Te Chang, Stephen H. Harris
  • Patent number: 5552023
    Abstract: Recovery of ethylene glycol from dilute aqueous solutions is accomplished by passing the solution over the surface of a porous hydrophobic membrane capable of passing water vapor but not liquid water. The pressure and temperature provide a positive driving force for the movement of water vapor through the membrane to the opposite face where it is removed by condensation or a stream of gas or liquid. Preliminary concentration of the aqueous solutions may be provided by use of reverse osmosis membrane. The method is useful in the reclamation of spent deicing fluid.
    Type: Grant
    Filed: December 15, 1993
    Date of Patent: September 3, 1996
    Assignee: AlliedSignal Inc.
    Inventor: Shaojun J. Zhou
  • Patent number: 5549794
    Abstract: An apparatus (10) for continuously extracting a solute from a carrier medium (102) is provided. The apparatus is formed from a vessel (12) including a convergent baffle (22) separating the vessel into a lower distillation chamber (24) and an upper extraction chamber (26). The convergent baffle is configured as an inverted funnel such that it defines a conduit riser (28) projecting upwardly into the extraction chamber and terminating in a vaporized solvent port (30) placing the distillation chamber in fluid-flow direct communication with the extraction chamber. A vapor rotating spheres-condenser (34) is mounted on the upper end of the vessel and opens into the extraction chamber. Solvent is placed in the distillation chamber while the carrier medium containing the solute is placed in the extraction chamber. Solvent is vaporized in the distillation chamber, rises upwardly through the conduit riser, and passes through the carrier medium, thereby extracting solute in a continuous linear-toroidal motion.
    Type: Grant
    Filed: May 24, 1994
    Date of Patent: August 27, 1996
    Assignee: H-O-H Research Inc.
    Inventor: Michael W. Mar
  • Patent number: 5538599
    Abstract: A process is provided whereby phenol is separated from 1-phenyl ethanol, acetophenone or mixtures by extractive distillation with sulfolane as extractive distillation agent which decreases phenol volatility relative to 1-phenyl ethanol and acetophenone.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: July 23, 1996
    Assignee: ARCO Chemical Technology, L.P.
    Inventors: Tim T. Wong, Stephen H. Harris, Thomas S. Zak, Te Chang
  • Patent number: 5536376
    Abstract: A method for producing 2-chloropyridine and 2,6-dichloropyridine by the steps of mixing vaporized chlorine and vaporized water to obtain dilute chlorine; introducing the dilute chlorine and vaporized pyridine into a reactor; and reacting the vaporized pyridine with the dilute chlorine in a gas phase under ultraviolet rays irradiation. By the method, 2-chloropyridine and 2,6-dichloropyridine can be produced in high yields. The present invention is also directed to a method for separating 2,6-dichloropyridine from a mixture containing 2,6-dichloropyridine, 2-chloropyridine and pyridine by the step of carrying out distillation of the mixture containing 2,6-dichloropyridine, 2-chloropyridine and pyridine in the presence of water while adding sulfuric acid to a distillation column. Highly purified 2,6-dichloropyridine can be separated by the method.
    Type: Grant
    Filed: December 28, 1993
    Date of Patent: July 16, 1996
    Assignee: Sumitomo Seika Chemicals Co., Ltd.
    Inventors: Shigenobu Yamaguchi, Johji Ogasahara, Hiroyuki Hata, Ryoichi Tokura, Hiromoto Shigeta
  • Patent number: 5496778
    Abstract: Highly purified ammonia for use in processes for the production of high-precision electronic components is prepared on-site by drawing ammonia vapor from a liquid ammonia reservoir, passing the vapor through a filter capable of filtering out particles of less than 0.005 micron in size, and scrubbing the filtered vapor in a high-pH aqueous scrubber.
    Type: Grant
    Filed: January 7, 1994
    Date of Patent: March 5, 1996
    Assignee: Startec Ventures, Inc.
    Inventors: Joe G. Hoffman, R. Scot Clark
  • Patent number: 5487817
    Abstract: A novel process for the recovery of tocopherols and sterols from natural, especially vegetable, sources. This process is especially a process for the separation of tocopherols and sterols from deodorizer sludges by distillation of these deodorizer sludges, in that prior to the distillation the sterols present in the deodorizer sludge are esterified with the fatty acids which are also present, the resulting mixture is distilled to obtain residual fatty acids and subsequently to obtain tocopherols, whereby the sterol esters formed in the esterification remain in the residue of this distillation, and then the tocopherols are isolated from the distillate and the sterols, after cleavage of their esters, are isolated from the distillation residue.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: January 30, 1996
    Assignee: Hoffmann-La Roche Inc.
    Inventor: Christian Fizet
  • Patent number: 5478443
    Abstract: An apparatus for extracting, concentrating, and separating biochemical compounds from plant or animal biological substances. It has a heating vessel for the substance to be treated, and is connected at its lower part to an evaporation circuit. The evaporation circuit is connected to the upper part of the heating vessel and, by a valve, to the bottom of a distillation column. A condenser is connected to a vacuum source and, by a valve to the top of the distillation column. A decanter is connected by a valve to the condenser and then successively to a first tank for recovering essential oil, a second tank for recovering aromatic water, and to the vacuum source. A dual discharge circuit has its first circuit connected by two valves to a third tank for receiving light aromatic compounds and to a fourth tank for receiving regenerated solvents.
    Type: Grant
    Filed: May 10, 1993
    Date of Patent: December 26, 1995
    Inventor: Pierre O. Cogat
  • Patent number: 5468350
    Abstract: The apparatus includes a container for accommodating water to be treated and evaporating the water. Container is attached with water supply for supplying the water to be treated into the container. The water to be treated in container is heated by a heater. Vapor evaporated from the inside of container is cooled by a cooler. Distilled water output from cooler is irradiated with ultraviolet light by a ultraviolet light irradiator. An organic decomposed substance contained in the distilled water irradiated with the ultraviolet light is removed by organic decomposed substance removal device, and ultrapure water is obtained.
    Type: Grant
    Filed: July 15, 1993
    Date of Patent: November 21, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Cozy Ban
  • Patent number: 5466344
    Abstract: A pollution control apparatus (10) for controlling water-based liquid waste includes a vacuum distillation vessel (14) for separating water-based liquid waste into a distilled water component and a pumpable sludge component. A pH control system (12) allows the vacuum distillation vessel (14) to operate at maximum efficiency, and a purification system (22) allows the distilled water component to be purified to a level capable for reuse in chemistry, or else suitable for direct discharge into a municipal sewer. A microprocessor allows the apparatus (10) to operate automatically.
    Type: Grant
    Filed: April 11, 1994
    Date of Patent: November 14, 1995
    Assignee: Houston Fearless 76, Inc.
    Inventor: Paul A. Lindke
  • Patent number: 5464531
    Abstract: A water purification device mounted within a housing adapted to be positioned on an existing water cooler/dispenser has a valve control member extending from the base of the housing and is positionable within the water reservoir of the dispenser to control the release of purified water from the device to the reservoir. The device includes a feedwater tank into which supply water is fed and which feeds water to a water level control tank which communicates with the bottom of a boiler which is maintained at the same level as the water in the control tank. The control tank includes a control valve which maintains the water in it to a predetermined level above the level of the heating element in the boiler. The boiler is connected to condenser coils for condensing vaporized water from the boiler to form distilled water which is directed through a carbon filter to a distillate storage tank where the purified water is stored until required by the water cooler/dispenser.
    Type: Grant
    Filed: October 14, 1993
    Date of Patent: November 7, 1995
    Assignee: Market Design & Development, Inc.
    Inventor: Ralph G. Greene
  • Patent number: 5454878
    Abstract: A system for removing hydrocarbons from solid materials. Contaminated solids are combined with a solvent (preferably terpene based) to produce a mixture. The mixture is washed with water to generate a purified solid product (which is removed from the system) and a drainage product. The drainage product is separated into a first fraction (consisting mostly of contaminated solvent) and a second fraction (containing solids and water). The first fraction is separated into a third fraction (consisting mostly of contaminated solvent) and a fourth fraction (containing residual solids and water). The fourth fraction is combined with the second fraction to produce a sludge which is separated into a fifth fraction (containing water which is ultimately reused) and a sixth fraction (containing solids). The third fraction is then separated into a seventh fraction (consisting of recovered solvent which is ultimately reused) and an eighth fraction (containing hydrocarbon waste).
    Type: Grant
    Filed: February 17, 1994
    Date of Patent: October 3, 1995
    Assignee: Lockheed Idaho Technologies Company
    Inventors: Gregory A. Bala, Charles P. Thomas
  • Patent number: 5454913
    Abstract: A reaction with distillation structure utilizes a plurality of distillation trays and catalyst containers which provide a catalytic reaction zone and a primary flow path for descending liquid streams. Catalytic reaction of the liquid streams within the catalyst reaction zone formed in the containers occurs concurrently with fractionation of the reaction products on the distillation trays. The containers may extend continuously through the reaction zone of the distillation reactor to allow for dump loading and removal of the solid particulate catalyst. Alternatively, the catalyst containers may extend from one tray toward a lower tray without passing through the latter. Structure may also be provided within the containers to influence system hydraulics through the accumulation of liquid within the catalyst bed. This is done by providing an open area interiorly of the catalyst bed into which liquid on the distillation tray is driven.
    Type: Grant
    Filed: October 16, 1992
    Date of Patent: October 3, 1995
    Assignee: Koch Engineering Company, Inc.
    Inventors: Neil Yeoman, Ronald Pinaire, Michael A. Ulowetz, Timothy P. Nace, David A. Furse
  • Patent number: 5453165
    Abstract: A system and method for reducing hydrocarbons in wastewater includes an oil separator and a stripper tower. The tower has a housing that includes a stripper section and a condensation section. The stripper section includes a plurality of trays and steam inlet under the trays. The condensation section includes a plurality of trays and a pan tray having provisions to allow vapors to rise from the stripper section.
    Type: Grant
    Filed: July 25, 1994
    Date of Patent: September 26, 1995
    Assignee: Atlantic Richfield Company
    Inventor: David E. Bachmann
  • Patent number: 5447607
    Abstract: Process equipment is provided for separating ether, alcohol and hydrocarbon components from various etherifications of C.sub.4 or C.sub.5 isoolefins with an alcohol such as methanol or ethanol, and wherein identical process vessels are utilized for recovery of MTBE, ETBE, TAME, or TAEE. In use the process vessels are serially arranged in three zones. The first zone includes a first water wash vessel followed by a first fractionator and provides the ether product, the second zone includes a second wash vessel followed by a hydrocarbon stripper and recovers a stabilized hydrocarbon stream, the third zone includes a second fractionator which recovers an alcohol suitable for recycling.
    Type: Grant
    Filed: May 20, 1994
    Date of Patent: September 5, 1995
    Assignee: Phillips Petroleum Company
    Inventors: John H. Eason, Joseph Klepac
  • Patent number: 5447609
    Abstract: A reaction with distillation column is provided with a plurality of discrete catalytic reaction containers. The containers contain a plurality of solid catalyst particles which form a catalytic reaction zone. The containers also comprise a liquid collection tray cover which defines a liquid accumulation zone immediately overlying the catalytic reaction zone. Overflow weirs are provided on the tray cover to allow for overflow of liquid on the tray cover. A member may be provided within the containers to create an open area within the catalytic reaction zone to facilitate entry of the liquid into the catalytic reaction zone. The containers can be individually positioned within the reactor to suit particular process requirements.
    Type: Grant
    Filed: October 16, 1992
    Date of Patent: September 5, 1995
    Assignee: Koch Engineering Company, Inc.
    Inventors: Neil Yeoman, Ronald Pinaire, Michael A. Ulowetz, O. Jeffrey Berven, Timothy P. Nace, David A. Furse
  • Patent number: 5445731
    Abstract: Apparatus for breaking or separating a liquid mixture or emulsion having two or more components. The apparatus includes a closed vessel having one or more sequentially connected filtering compartments holding a filtering element such as a membrane assembly capable of achieving a multi-stage pervaporation to separate out a vaporous component of the solution. The apparatus further includes a bypass facility which interconnects adjacent filtering compartments. To compensate for the loss of heat energy during the vaporization segments, the residual liquid solution is bypassed into a second vaporization phase, the bypass facility including heating means for maintaining the residual solution of a predetermined liquid temperature prior to its entering the second or subsequent filtering phase.
    Type: Grant
    Filed: September 8, 1993
    Date of Patent: August 29, 1995
    Assignee: Texaco Inc.
    Inventors: David Tuohey, Craig R. Bartels, Vatsal M. Shah
  • Patent number: 5413681
    Abstract: A process useful for the recovery of terephthalic acid and ethylene glycol from poly(ethylene terephthalate) or its copolymers. The process is economical, beneficial to the environment and provides polymer grade terephthalic acid and ethylene glycol from post-consumer resin. The process is a six-step process including: (1) contacting a resin containing poly(ethylene terephthalate) with water at elevated temperature and pressure, (2) cooling the resulting mixture to provide a solid portion containing terephthalic acid and a liquid portion containing ethylene glycol, (3) recovery of the ethylene glycol from the liquid portion by distillation, (4) recovery of the terephthalic acid by heating the solid portion in the presence of water vapor at elevated temperature to produce a vapor containing terephthalic acid and water, (5) cooling terephthalic acid water vapor mixture to a temperature below the dew point of terephthalic acid and (6) collecting the polymer grade terephthalic acid.
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: May 9, 1995
    Assignee: Eastman Chemical Company
    Inventors: Gerald C. Tustin, Thomas M. Pell, Jr., David A. Jenkins, Mary T. Jernigan
  • Patent number: 5397440
    Abstract: Process for isolating dimethyl 4,4'-biphenyldicarboxylate from residues of DMT production, which includes first distilling the residues at a pressure of at most 7 mbar at a boiler temperature from 200.degree. to 350.degree. C., subsequently treating the distillate which distills over in the range from 230.degree. to 270.degree. C. at a pressure of, for example, 0.2 mbar for from 10 to 60 minutes with 0.7 to 10 times the amount of an organic solvent at a temperature from 70.degree. to 180.degree. C., if required, separating the clear solution from undissolved components, cooling the removed clear solution to a temperature from 45.degree. to 65.degree. C. and allowing it to crystallize at this temperature, resulting in a suspension of dimethyl 4,4'-biphenyldicarboxylate crystals from which the crystals are isolated by washing one or more times with the same or a different solvent and by drying.
    Type: Grant
    Filed: April 13, 1994
    Date of Patent: March 14, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Michael Frey, Ulrich Hertenstein, Rainer Schaller
  • Patent number: 5374337
    Abstract: A halohydrocarbon solvent recovery process. The process in one embodiment includes heating a gross mixture including solvent, fatty-acid impurities and water in a bath to vaporize at least a portion of the solvent and the impurities. A portion of the vapor is then condensed in a reflux condenser to form a condensate mixture. After drying and impurity absorption, a solvent product of at least 99% purity may be recovered. In one embodiment, the gross mixture is obtained from steam stripping dry-cleaner filter cartridges.
    Type: Grant
    Filed: August 20, 1993
    Date of Patent: December 20, 1994
    Assignee: Technichem Engineering, Ltd.
    Inventors: Mark J. Ng, Bruce T. Maeda
  • Patent number: 5340444
    Abstract: A circulation cooler (10) has a heat exchanger (12) in a housing (11) that contains a cooling liquid and is detachably connected by its forward flow (13) to an inlet line (5), and by its return line (14) to the outlet (6) of a condenser (4) of a distillation apparatus (1). The circulation cooler (10) moreover has a vacuum pump (21) inside its housing (11) and an absorber (28) outside its housing (11). A second condenser (24) is interposed along the cooling agent inlet line (13) between the circulation cooler (10) and the condenser (4) of the distillation apparatus (1), and is connected to a vacuum line (27). The cooling liquid (25) flows successively to the heat exchanger ( 12) through the two condensers (24, 4) , then back to the heat exchanger (12). In both condensers, which are under a vacuum through common vacuum line (26, 27) , the condensation of the liquid substances is effected in the form of main condensation and aftercondensation phases.
    Type: Grant
    Filed: June 22, 1993
    Date of Patent: August 23, 1994
    Assignee: Peter W. D. van der Heijden Laborbedarf
    Inventor: Peter W. D. van der Heijden
  • Patent number: 5336377
    Abstract: 2-Chloro-1,1-difluoroethylene (R-1122) is removed from 1,1,1,2-tetrafluoroethane (R-134a) by contacting the R-134a in the vapor phase with chlorine in the presence of ultraviolet light providing an exposure of at least about 2 watts-hour/kg.
    Type: Grant
    Filed: December 18, 1991
    Date of Patent: August 9, 1994
    Assignee: Allied-Signal Inc.
    Inventors: Stephen F. Yates, Daniel F. Harnish, Addison M. Smith
  • Patent number: 5322596
    Abstract: A combination filter and evaporator unit for use in small engine applications includes a filter member that is screw threadedly engaged to the evaporator unit to facilitate replacement of filter media as needed. The design of the unit constrains incoming oil to flow first through the filter media and then to an evaporation chamber. A central hub and a bottom wall of the evaporation chamber are directly heated by a heating element, and the evaporation chamber is closed by an imperforate lid so that heat loss is inhibited.
    Type: Grant
    Filed: December 30, 1992
    Date of Patent: June 21, 1994
    Assignee: Premo Lubrication Technologies, Inc.
    Inventor: Thomas L. Arntz
  • Patent number: 5316625
    Abstract: An apparatus for separating a partially miscible solvent from a contaminated water stream. The apparatus includes a fully enclosed containment vessel having an internal volume bounded by a plurality of walls which define the width, length and height of the internal volume. Devices for feeding the contaminated water, for discharging a solvent rich vapor stream, and for discharging a purified water stream are provided. A dam separates the internal volume into a phase separation zone and a falling film stripping zone with the dam located proximate one end of the internal volume. The dam includes a wall sealably disposed across the entire width of the internal volume and extended upward to a terminal location a distance from the bottom of the internal volume over a portion of the height of the internal volume. In use, the dam determines and maintains a maximum liquid level in the phase separation zone.
    Type: Grant
    Filed: June 3, 1993
    Date of Patent: May 31, 1994
    Assignee: Crown Iron Works Company
    Inventor: George E. Anderson
  • Patent number: 5314586
    Abstract: A distilled water fountain which is capable of supplying the users with purified icy, warm and hot drinking water and composed of a pre-heating exchanger, a condensing-and-heating exchanger, a distilled water tank, a steam generator, and an electronic chilling device. Running water flows into the pre-heating exchanger through water intake pipe, and further flows through the condensing-and-heating exchange into a steam generator wherein the water is vaporized and then condensed into distilled water for storage in the distilled water tank. The distilled water may be made available directly in warm water condition, or may be cooled into icy water through electronic chilling device, or heated into hot water through steam generator for drinking by users.
    Type: Grant
    Filed: October 16, 1992
    Date of Patent: May 24, 1994
    Inventor: Chan-Ming Chen
  • Patent number: 5314588
    Abstract: A process for recovering a distillate of tolylene diisocyanate and an isocyanate-group-containing sump product containing less than 200 ppm (by weight) tolylene diisocyanate from A) distillation residues obtained in the production of tolylene diisocyanate by mixing of the distillation residues A) with B) optionally urethane- and/or allophanate-modified polyisocyanates or polyisocyanate mixtures of the diphenyl methane series, heating of the mixture to 190.degree. to 250.degree. C. and simultaneously or subsequently working up by distillation.
    Type: Grant
    Filed: August 11, 1992
    Date of Patent: May 24, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Uwe J. Zarnack, Volker Weintritt, Christian Konig
  • Patent number: 5300197
    Abstract: A distillation apparatus includes a distillation unit for distilling feed water. The distillation unit includes an evaporation part, a condensation part and a hydrophobic porous membrane interposed between the evaporation part and the condensation part, which are integrated with one another. A heating unit for heating the feed water and a cooling portion for cooling distillate produced by distillation of the feed water are provided apart from the distillation unit. One or both of the heating unit and the cooling unit are provided with a heat pump. With this construction, an additional heater does not need to be provided, and the distillation unit and both of the heating unit and the cooling unit can be changed in size and performance independently of each other, so that the overall size of the distillation apparatus can be reduced.
    Type: Grant
    Filed: December 10, 1990
    Date of Patent: April 5, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Kenji Mitani, Akira Ashida, Katsuya Ebara, Hideaki Kurokawa
  • Patent number: 5298128
    Abstract: Polyurethane can be reclaimed from solvent-containing or solvent-free polyurethane wastage by adjusting the amount of solvent, preferably with methyl ethyl ketone; adding an emulsifier, preferably, acylpolyethyleneglycolester; then adding about twelve times the wastage weight of water; mixing, preferably for about one hour at room temperature to form an emulsion; and then expelling the solvent as a two-phase distillate using steam; separating solvent from the resulting two-phase distillate; filtering off polyurethane granular material left floating in the water residue, and drying the separated granular material.
    Type: Grant
    Filed: April 9, 1992
    Date of Patent: March 29, 1994
    Assignee: Firma Carl Freudenberg
    Inventors: Jorg Hausdorf, Bardo Anselm, Steffen Kosack
  • Patent number: 5290402
    Abstract: An automatic cold/hot distilled water fountain which automatically performs water boiling, condensing, storing and heating processes to provide purified cold/hot drinking water, mainly composed of a distilling chamber, a condensing mechanism, a water reservoir and a heating box, whereby by the automatic control system designed for the water fountain, the water is controllably supplied into the distilling chamber and distilled therein and the distilled water is then collected and stored in the water reservoir to be directly discharged therefrom as a purified cold drinking water or further heated by the heating box to serve as hot drinking water. By the above arrangement, the amount of the water stored in the water fountain is properly kept within a predetermined range and what is most important is the safety and hygiene in water drinking is insured.
    Type: Grant
    Filed: May 10, 1993
    Date of Patent: March 1, 1994
    Inventor: Yao K. Tsai
  • Patent number: 5284552
    Abstract: A method for refining a methylnaphthalene-containing oil includes the steps of azeotropically distilling the methylnaphthalene-containing oil with ethylene glycol to produce a methylnaphthalene fraction having a reduced content of nitrogen compounds; and hydrodesulfurizing the methylnaphthalene fraction in the presence of a catalyst having loaded thereto at least one member selected from molybdenum, cobalt and nickel.
    Type: Grant
    Filed: June 5, 1992
    Date of Patent: February 8, 1994
    Assignee: Kawasaki Steel Corporation
    Inventors: Toshihide Suzuki, Yoshinori Takagi, Tatsuya Nobusawa
  • Patent number: 5281310
    Abstract: A solar apparatus such as a solar water heater or cooler comprising a cell which is partially transparent to the sun's rays and has an internal section formed by an assembly of two casing which surround one another and define the variable capacity of the absorber as well as various means for supplying, storing and discharging water.
    Type: Grant
    Filed: December 19, 1991
    Date of Patent: January 25, 1994
    Inventors: Myriam Djelouah, Nadia Djelouah
  • Patent number: 5281309
    Abstract: A water purification device mounted within a housing adapted to be positioned on an existing water cooler/dispenser has a valve control member extending from the base of the housing and is positionable within the water reservoir of the dispenser to control the release of purified water from the device to the reservoir. The device includes a feedwater tank into which supply water is fed, either automatically, or manually. The feedwater tank, when the water is above a minimal level, feeds water to an anti-backflow control housing which communicates the water from the feedwater tank to the bottom of a boiler which is maintained at the same level as the water in the feedwater tank without the use of a float within the boiler. The anti-backflow housing includes a check valve in the form of a ball that prevents the backflow of heated water from the boiler into the feedwater tank.
    Type: Grant
    Filed: June 23, 1992
    Date of Patent: January 25, 1994
    Assignee: Market Design & Development, Inc.
    Inventor: Ralph G. Greene
  • Patent number: 5266170
    Abstract: A low profile water distiller has a housing. A steam chamber is located within the housing having a horizontal dimension greater than its vertical height. A condenser is also located within the housing having a horizontal dimension greater than its vertical height. The vertical height of the condenser is generally the same as the vertical height of the steam chamber. A raw water conduit extends in a generally horizontal plane within the housing for delivering water to be distilled into the steam chamber. A steam conduit also extends within the housing for delivering steam from the steam chamber to the condenser. The steam conduit extends in a generally horizontal plane parallel to the generally horizontal plane of the raw water conduit. An air circulation channel within the housing draws cooling air through the condenser in a generally horizontal path parallel to the generally horizontal planes of the raw water conduit and the steam conduit.
    Type: Grant
    Filed: February 18, 1992
    Date of Patent: November 30, 1993
    Assignee: Emerson Electric Co.
    Inventors: Thomas J. Weber, Richard E. Forrest, Dale L. Garrison
  • Patent number: 5196093
    Abstract: A water distiller has a housing having an open interior area and a door that can be opened and closed to permit and block access into the interior area. A steam chamber is located in the interior area. The steam chamber includes a movable tray for holding water to be distilled. The tray seats against a fixed top where steam created in the chamber by heating the water in the tray is collected. By opening the door to the distiller, the tray can be unseated and removed for cleaning. After cleaning, the tray can be returned to the distiller and reseated against the top steam collecting portion by closing the door. In a preferred arrangement, the tray includes a chamber for holding a water soluble disinfectant for release during the distillation process.
    Type: Grant
    Filed: January 18, 1991
    Date of Patent: March 23, 1993
    Assignee: Emerson Electric Co.
    Inventors: Thomas J. Weber, Dale L. Garrison, Richard E. Forrest
  • Patent number: 5110419
    Abstract: A low profile water distiller has a housing. A steam chamber is located within the housing having a horizontal dimension greater than its vertical height. A condenser is also located within the housing having a horizontal dimension greater than its vertical height. The vertical height of the condenser is generally the same as the vertical height of the steam chamber. A raw water conduit extends in a generally horizontal plane within the housing for delivering water to be distilled into the steam chamber. A steam conduit also extends within the housing for delivering steam from the steam chamber to the condenser. The steam conduit extends in a generally horizontal plane parallel to the generally horizontal plane of the raw water conduit. An air circulation channel within the housing draws cooling air through the condenser in a generally horizontal path parallel to the generally horizontal planes of the raw water conduit and the steam conduit.
    Type: Grant
    Filed: January 18, 1991
    Date of Patent: May 5, 1992
    Assignee: Emerson Electric Co.
    Inventors: Thomas J. Weber, Richard E. Forrest, Dale L. Garrison
  • Patent number: 5106425
    Abstract: A method for maintaining a flammable solvent in a nonflammable environment involves covering the flammable solvent with a nonflammable vapor blanket provided by a nonflammable solvent, such that vapors from the flammable and nonflammable solvents form a nonflammable gaseous mixture in the blanket. Such a method is used in removal of both oil-based and polar contaminants to control the flammability potential of an alcohol solvent. An apparatus for cleaning articles using fluorocarbon and alcohol solvents includes a chamber having a plurality of compartments for containing the solvents and a bounded vapor space. At least one of the compartments contains liquid fluorocarbon and at least one other will contain liquid alcohol. The solvents voltalize into the bounded vapor space to provide a nonflammable vapor blanket over the alcohol-containing compartment.
    Type: Grant
    Filed: February 22, 1991
    Date of Patent: April 21, 1992
    Assignee: Baxter International, Inc.
    Inventors: Robert M. Sluga, Randolph H. Watkins, Jerry D. Fisher, Dennis C. Berry, Milo Eldridge
  • Patent number: 4954222
    Abstract: A dry cleaning solvent recovery and filtering system includes a dry cleaning solvent tank containing solvent for use in a dry cleaning machine. A filtration path from the tank includes a centrifugal separator for removing coarse debris and a filter element for removing fine debris from the solvent fluid. The filter element includes a perforated metal cylinder, having an open mouth, with a Teflon.RTM. coated screen forming the interior debris collection surface. A rinsing spray nozzle situated at the mouth of the filter element directs a fluid spray under pressure against the collection surface in the same direction that debris contaminated solvent fluid flows therethrough. The pressure of the fluid spray is sufficient to dislodge fine debris adhered to the collection surface without forcing the debris into the perforations of the filter element.
    Type: Grant
    Filed: November 18, 1988
    Date of Patent: September 4, 1990
    Inventors: Larry L. Durr, B. Jan Clay, Larry J. Durr
  • Patent number: RE36527
    Abstract: A combination filter and evaporator unit for use in small engine applications includes a filter member that is screw threadedly engaged to the evaporator unit to facilitate replacement of filter media as needed. The design of the unit constrains incoming oil to flow first through the filter media and then to an evaporation chamber. A central hub and a bottom wall of the evaporation chamber are directly heated by a heating element, and the evaporation chamber is closed by an imperforate lid so that heat loss is inhibited.
    Type: Grant
    Filed: June 21, 1996
    Date of Patent: January 25, 2000
    Assignee: Premo Lubrication Technologies, Inc.
    Inventor: Thomas L. Arntz