Indirectly Heated Patents (Class 159/23)
  • Patent number: 9555341
    Abstract: A spray-drying device includes a spray nozzle that sprays the dehydrated filtrate from the desulfurization wastewater, in a spray-drying device body, an inlet that is provided in the spray-drying device body and introduces flue gas for drying spray liquid, a dry area that is provided in the spray-drying device body and dries the dehydrated filtrate by the flue gas, an outlet that discharged the flue gas contributing to the drying, a plurality of thermometers that are provided in the dry area and measure temperatures of the inside, a determination unit that determines whether or not a spray-drying state of the dehydrated filtrate is satisfactory on the basis of the measurement results of the thermometers, and a control unit that adjusts the flue gas or the dehydrated filtrate when it is determined that the spray-drying is not satisfactory as a result of the determination of the determination unit.
    Type: Grant
    Filed: March 22, 2012
    Date of Patent: January 31, 2017
    Inventors: Nobuyuki Ukai, Tatsuto Nagayasu, Naoyuki Kamiyama, Seiji Kagawa, Toshihiro Fukuda
  • Publication number: 20140000814
    Abstract: One evaporator includes a housing defining a generally enclosed interior area and a stepped cascade separating the interior area into an upper chamber and a lower chamber. The stepped cascade includes sequential trays and risers. At least one tray has a hole connecting the upper chamber with the lower chamber, and at least one riser has a hole connecting the upper chamber with the lower chamber. An input device selectively introduces wastewater into the upper chamber, and a heat source selectively introduces heat into the lower chamber sufficient to evaporate water from the wastewater atop and passing through the stepped cascade. A gas exit provides a passage for gas from the interior area to outside the housing.
    Type: Application
    Filed: June 27, 2013
    Publication date: January 2, 2014
    Inventor: Raymond E. VanKouwenberg
  • Publication number: 20130267675
    Abstract: A process is described for producing a high molar mass polylactic acid, which comprises the following steps: a) polycondensation in a reactor (R1) of a lactic acid solution, by heating in the form of temperature gradients and under controlled pressure, resulting in a polylactic acid oligomer within the range of 300 to 5000 g/mol; b) conversion, in reactor (200), of the polylactic acid of low molar mass obtained in step a) to a lactide, in the presence of a depolymerization catalyst; c) separation of the volatile fractions; d) recrystallization of the lactide in the vessel (R3), in order to obtain ethanol; e) polymerization, in a tube reactor (300), of the recrystallized lactide obtained in step d), via ring opening in the presence of the catalyst, producing a high molar mass polylactic acid; f) devolatilization, at (400), of the polymeric mass obtained in step e); and g) recovery of the final polylactic acid product with a high degree of purity, with a molar mass of between 50 000 and 200 000 g/mol and a reac
    Type: Application
    Filed: August 17, 2011
    Publication date: October 10, 2013
    Inventor: Paulo Yoshida
  • Publication number: 20130032298
    Abstract: A system and method for providing operational control to a dehydration unit involves monitoring a rate of liquid extraction from material in the unit. The volumetric flow rate of condensate from air extracted from the dehydrating unit may be monitored and used to control operation of the dehydrating unit, particularly termination of the heating process of the dehydrating unit.
    Type: Application
    Filed: June 26, 2012
    Publication date: February 7, 2013
    Inventors: Michael D. Putt, Steven M. Eno, Shaun A. Leid
  • Patent number: 8246916
    Abstract: Disclosed herein is provided an evaporator/calciner in which hazardous materials, such as radioactive liquids, are converted into chemically stable, solid forms by evaporating, drying and calcination within a single vessel, that can then be sealed and used for long term storage.
    Type: Grant
    Filed: April 16, 2010
    Date of Patent: August 21, 2012
    Assignee: Atomic Energy of Canada Limited
    Inventors: Kenneth James Franklin, Andrew Donald Kettner, Bruce Wayne Hildebrandt, Howard Charles Jessup, Jr.
  • Publication number: 20120111506
    Abstract: The invention relates to a method for the controlled evaporation of a liquid drop (2) in a closed or confined type microfluidic device (1), enabling the concentration of analytes possibly present in the drop (2) to be increased. According to the invention, a drop (2) and/or a bubble (4) are brought into contact with each other, said contact enabling the drop (2) to evaporate in the bubble (4).
    Type: Application
    Filed: November 9, 2011
    Publication date: May 10, 2012
    Inventor: Arnaud RIVAL
  • Patent number: 8080138
    Abstract: This invention describes a low temperature, self-sustainable desalination process operated under natural vacuum conditions created and maintained by barometric pressure head.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: December 20, 2011
    Assignee: Arrowhead Center, Inc.
    Inventors: Nagamany Nirmalakhandan, Veera Gnaneswar Gude
  • Patent number: 8034214
    Abstract: A reciprocating film type evaporator for solvents and other chemicals which eliminates the need for a large powerful motor, and other associated equipment such as rotary gaskets, by using reciprocation, versus 360 degree rotation.
    Type: Grant
    Filed: April 12, 2007
    Date of Patent: October 11, 2011
    Assignee: Tracera LLC
    Inventors: Collin McKinney, Rob Musser
  • Patent number: 7802376
    Abstract: An apparatus for treating particulate material has a process chamber for receiving and treating the material. A bottom is composed of a plurality of overlapping guide plates which are placed one above the other and between which annular slots for process air to pass through are formed. An annular-gap nozzle is arranged centrally in the bottom, the orifice of this annular-gap nozzle being designed in such a way that a planar spray pancake which runs approximately parallel to the bottom plane can be sprayed.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: September 28, 2010
    Inventor: Herbert Hüttlin
  • Patent number: 7332058
    Abstract: Disclosed is a process for devolatilizing a polymer including passing the polymer through a devolatizer including a plate heat exchanger wherein the plates of the plate heat exchanger are heated by a plurality of heating tubes and wherein the heating tube including a return tube nested inside of a supply tube. The use of the disclosed invention allows for a comparatively small heat profile across heating plates as compared to prior art plate heat exchangers.
    Type: Grant
    Filed: July 31, 2003
    Date of Patent: February 19, 2008
    Assignee: Fina Technology, Inc.
    Inventor: Jay Reimers
  • Patent number: 6969446
    Abstract: Process for producing a nitric acid of a concentration from 75 to 99.9% from a more diluted nitric acid, wherein a nitric acid of a concentration of about 45 to 70% is rectified in contact with a liquid extraction medium to prevent the formation of a nitric acid-water-azeotropic mixture, and the vapors of the concentrated nitric acid are condensed and a concentrated nitric acid is obtained and wherein additionally the extraction medium is reconstituted through reconcentration and returned into the extractive rectification, wherein the nitric acid to be concentrated is fed as a boiling liquid or partially vaporized to the extractive rectification preferably carried out in two columns (K 1.0, K 1.
    Type: Grant
    Filed: May 22, 2000
    Date of Patent: November 29, 2005
    Assignee: QVF Engineering GmbH
    Inventors: Gottfried Dichtl, Frank Dorstewitz, Manfred Sassenberg, Ulrich Walter
  • Patent number: 6887344
    Abstract: A compact, self-contained apparatus for treating wastewater containing as impurities and pollutants various non-volatile (at water boiling points) fluids such as greases, oils and soaps, a vessel for collecting the wastewater, a heating chamber including electric heating elements and a heat transfer liquid such as mineral oil to heat the wastewater admixture to boil off the water and to reduce the volume of liquid for disposal, and a wastewater supply tank positioned under the apparatus. The apparatus may further include a disposable liner to isolate the wastewater from the vessel itself and facilitate rapid and clean removal and disposal of waste material after evaporation of the water, and thermally-activated sensors to maintain a desired temperature differential between the heating elements and the heat transfer liquid contained in the apparatus.
    Type: Grant
    Filed: August 2, 2000
    Date of Patent: May 3, 2005
    Inventor: Raymond E. VanKouwenberg
  • Patent number: 6878342
    Abstract: An apparatus for evaporating liquid samples contained in sample holders mounted within a chamber and by rotated by the rotor during an evaporation process in which the pressure in the chamber is reduced below atmospheric and the sample holders are rotated at high speed so as to exert centrifugal force on the contents of the holders. Heat is supplied to elevate the temperature of the liquid component of the samples to assist in the evaporation process. The temperature of the sample material is continuously or regularly monitored during the evaporation process and temperature signals are transmitted to a remote computing means which is programmed to generate a control signal for controlling the supply of heat to the samples and controlling the evaporation process. The temperature may be sensed by a probe in a sample holder containing an evaporating liquid sample, or in an adjoining sample holder containing a buffer liquid. The rotational speed is also sensed and a speed signal conveyed to the computing means.
    Type: Grant
    Filed: November 28, 2001
    Date of Patent: April 12, 2005
    Inventor: Michael Cole
  • Patent number: 6699369
    Abstract: A method for removing dissolved solids, particularly salts, from water. An apparatus for performing the inventive method is disclosed. The aqueous solution to be treated, for example sea water, is atomized using special non-pneumatic nozzles, and sprayed into an evaporation chamber through which air, heated by waste heat, is blown. The micro-droplets undergo rapid evaporation in the chamber, resulting in the separation of the salt solids from the vapor phase of the water. The mixture of suspended solids and water vapor is filtered to remove and collect the salts, and the water vapor is condensed to collect the salt-free water.
    Type: Grant
    Filed: August 10, 2001
    Date of Patent: March 2, 2004
    Assignee: Aquasonics International
    Inventors: William Francis Hartman, Larry Joe Kepley, Jerry Van Fox
  • Publication number: 20040026225
    Abstract: The invention concerns appliances, one of which uses solar energy as sole source of power. It comprises an accumulation solar water heater (222) and quasi-reversible liquid/vapour heat exchanging alveolar elements, provided with hydrophilic coatings. Elements of types E and C, respectively assigned to water evaporation (224a, b, c) and to vapour condensation (226a-b) are interposed, with narrow free spaces, in a heat-insulated treatment chamber (223), arranged above the boiler (222). Hot water coming from the heater (222) flows in closed circuit, by thermosiphon, from the top downwards of elements E and from the bottom upwards of elements C. A slightly cooling member (242) is interposed between the bottom collectors (240-244) of elements E and C. Hot water spills over slowly from the top of the hydrophilic coatings of elements E and the vapour produced is condensed opposite, on the walls of elements C.
    Type: Application
    Filed: June 12, 2003
    Publication date: February 12, 2004
    Inventor: Jean-Paul Domen
  • Publication number: 20030188962
    Abstract: A distillation system is provided having an evaporation conduit and a condensing conduit connected by a transfer system for transferring distillate vapour from the evaporation conduit to the condensing conduit to condense the distillate. The evaporation and condensing conduits operate under vacuum pressure. An intake conduit and a return conduit communicate in an unrestricted manner between a source of solution and the evaporation conduit. A distillate conduit communicates with the condensing conduit for dispensing condensed distillate therefrom. A radiant heat capturing system is provided for capturing and using heat radiated from the distillate conduit to generate power.
    Type: Application
    Filed: April 3, 2002
    Publication date: October 9, 2003
    Inventor: George Atwell
  • Publication number: 20030150704
    Abstract: One or more water distillation chambers are provided wherein water containing salt or other impurities enters an upper inlet at a chamber and flows down a solar heated evaporative surface. The evaporative surface may be the interior of a pipe or the surface of a bottom sheet enclosed by a cover. In this way, the steam produced in the process will be constrained and be guided into a steam drum. The steam drum interior has cooling tubes whereby vapor entering the steam drum will be condensed into fresh water and collected for use. The cover may be heated to limit the amount of vapor condensing back into water before entering the steam drum. Multiple evaporation chambers and steam collection stages limit the distance water vapor must travel before entering a steam drum of a given stage, thereby minimizing the loss of water vapor through re-condensation before the vapor enters the steam drum.
    Type: Application
    Filed: January 6, 2003
    Publication date: August 14, 2003
    Inventor: Juan M. Posada
  • Publication number: 20030108473
    Abstract: Commercial grade ammonia is purified for use in production of semiconductors by initially passing the liquid ammonia through a liquid phase oil separation system. This removes the vast majority of the impurities. The filtered liquid ammonia is then passed through a vaporizer which quiescently forms ammonia vapor and prevents entrainment of impurities within the ammonia vapor. The vapor passes through a vapor filtration system and subsequently to a bubble column. The bubble column is designed so that the bubbles are small enough and travel at a rate which ensures that any entrapped particle within the bubble will have time to migrate to the surface of the bubble and thereby pass through the liquid phase. The collected vapor is directed through subsequent vapor filters and is collected. If anhydrous ammonia is desired, the ammonia vapor is collected upstream of the bubble column.
    Type: Application
    Filed: January 22, 2003
    Publication date: June 12, 2003
    Applicant: Ashland Inc.
    Inventors: Daniel J. Dershowitz, Ryan L. Mears, Jay F. Schnaith, Curtis Dove, Sadhana Mahapatra, Kevin K. Wadsworth
  • Patent number: 6485607
    Abstract: A method for removing volatile components from polymer solutions is disclosed. The method, yielding products having low content of residual volatile components and causing no thermal damage to the polymer, entails using apparatuses in which surfaces which come into contact with the product are made from materials which are low in iron content.
    Type: Grant
    Filed: October 13, 2000
    Date of Patent: November 26, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Elsner, Jürgen Heuser, Christian Kords
  • Publication number: 20020166758
    Abstract: The invention consists of a cost-effective process and facilities for obtaining high quality drinking water and high-grade brine as a chemical raw material from raw water regardless of how much salt it contains. When combined with a thermal power-generation process, the plant also produces electric power with a fuel utilization of over 85%.
    Type: Application
    Filed: July 3, 2002
    Publication date: November 14, 2002
    Inventor: Peter Vinz
  • Patent number: 6413361
    Abstract: A heavy oil emulsified fuel evaporator system is provided in which a heavy oil emulsified fuel, after being preheated at a preheater, flows into an evaporator to be heated and then to a separator for separation of its water content. The water content, after being separated, is used as a preheating source medium for said preheater, wherein water content separation at a predetermined level is enabled irrespective of load change in a heavy oil fuel combustion equipment, and no light oil content is discharged together with the separated water content. Heavy oil emulsified fuel 11a is preheated at a preheater 13, is heated at an evaporator 14 and flows into a separator 15 to be separated of its water content. Water content, after being separated, is sent via a piping 15a to be used as the preheating source medium for the preheater 13.
    Type: Grant
    Filed: May 14, 1998
    Date of Patent: July 2, 2002
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Hirokazu Hino, Kimishiro Tokuda, Toshimitsu Ichinose, Katsuyuki Ueda
  • Patent number: 6200428
    Abstract: Wastewater treatment apparatus having a fluid receiving vessel for collecting and heating wastewater to a temperature below boiling, a superheated vaporizing chamber and at least one spray head to spray wastewater into the vaporizing chamber for conversion of the wastewater to vapor to be withdrawn from the apparatus, with the contaminants in the wastewater collected in the apparatus for separate removal.
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: March 13, 2001
    Inventor: Raymond E. VanKouwenberg
  • Patent number: 6197152
    Abstract: A process and apparatus for continuously removing soluble minor constituents from brines containing soluble major and minor constituents by use of a Helminthoid evaporator.
    Type: Grant
    Filed: April 18, 1997
    Date of Patent: March 6, 2001
    Assignee: Tarim Associates for Scientific Mineral & Oil Exploration AG
    Inventor: Kenneth J. Hsu
  • Patent number: 6132555
    Abstract: A method and arrangement for increasing evaporation capacity in a multi-stage evaporation plant of spent liquor of a pulp mill. The method includes increasing the pressure of vapor discharged from an evaporation stage by a separate booster, and supplying the vapor having increased pressure to the following evaporation stage. In the arrangement the booster (A-E) is provided in a conduit through which vapor is supplied from one evaporation stage onwards for increasing the pressure of the vapor conducted in the conduit.
    Type: Grant
    Filed: October 30, 1997
    Date of Patent: October 17, 2000
    Assignee: Kvaerner Pulping Oy
    Inventors: Jouko Rikkinen, Tuomo Pokki
  • Patent number: 6027607
    Abstract: A process for extracting salt from brine contained in at least one open evaporation basin. At least part of the brine is heated in a heating unit located outside the evaporation basis and returned to the evaporation basin. The heating unit is driven by waste heat from a recooling industrial plant. According to this process, climatic values and the degree of recooling are measured and evaluated in a control unit. At least part of the heated brine and some non-heated brine are sprayed by a spraying device of the evaporation basin. The amount of sprayed brine is regulated by the control unit depending on the measured data.
    Type: Grant
    Filed: July 31, 1998
    Date of Patent: February 22, 2000
    Assignee: Krebs & Co. AG
    Inventor: Vicente Gracia Corniel
  • Patent number: 5772843
    Abstract: An evaporator includes a tank covered by a lightweight lid which is easily lifted to avoid high pressure in the event of an explosion. The bottom of the tank includes a flat portion which slopes downwardly toward an outlet in the sidewall of the tank. The flat section is substantially wider than the outlet to accommodate use of a square-nosed shovel to clean the tank. A fire tube in the bottom of the tank receives hot gases from a burner. A thermometer senses the temperature of the wall of the fire tube to respond to low liquid level in the tank, scale on the fire tube wall, and buildup of solids in the mixture. The open lower end of an upwardly extending standpipe is in liquid in the tank. The upper end of the standpipe is closed by a ball valve and extends above the mixture in the tank. Devices are provided for making the pressure in the standpipe different from atmospheric pressure.
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: June 30, 1998
    Inventor: Laurence Mark Rhodes
  • Patent number: 5730836
    Abstract: A method for concentrating a clay slurry by subjecting the slurry to indirect heat exchange within a heat exchanger to elevate the temperature of the slurry while specifically suppressing boiling of the liquid within the heat exchanger. The heated slurry is subsequently subjected to a rapid pressure reduction which causes flash evaporation of part of the liquid. The rapid pressure reduction can occur in a separation vessel.
    Type: Grant
    Filed: September 26, 1994
    Date of Patent: March 24, 1998
    Assignee: Comalco Aluminium Limited
    Inventors: Christopher Roy Greig, Peter James Tait, Peter John Noble
  • Patent number: 5639427
    Abstract: An assembly for prepping sulfuric acid for spectrometric analysis comprised of a vessel member having sleeve members formed with channels disposed about an outer peripheral surface and a cap member including a disc shaped top portion and a lower body portion and further including a gasket member to be positioned between the cap member and the vessel member wherein the lower body portion extending into a chamber of the vessel member and wherein the top portion includes channels to be aligned with the channels of the sleeves of the vessel member for receiving mounting devices for rigidly mounting the cap member to the vessel member.
    Type: Grant
    Filed: January 26, 1995
    Date of Patent: June 17, 1997
    Assignee: Ashland Inc.
    Inventors: Paul J. Chenevert, Peter Stone
  • Patent number: 5624530
    Abstract: Spray drying system for drying a liquid feed which is made up of a solution or suspension of particles in a fluid medium. The system enables the spray drying of wet material and converting the material into powder by evaporation of a liquid medium at reduced pressure or at a vacuum. The system includes a heating chamber and an evacuation device, communicating with the interior of the heating chamber. This provision enables creation of reduced pressure within the chamber, accompanied by evaporation of the fluid medium at temperatures lower than needed for evaporation at normal pressure, and evacuation of the moisture vapor generated during evaporation.
    Type: Grant
    Filed: April 21, 1994
    Date of Patent: April 29, 1997
    Assignee: Ultrasonic Dryer, Ltd.
    Inventors: Akper Sadykhov, Raphael Semiat
  • Patent number: 5582690
    Abstract: Desalination of sea water is achieved using a solar pond that includes a halocline interposed between a convective upper wind mixed layer exposed to the ambient atmosphere, and a lower heat storage layer of hot, concentrated brine, Hot brine from the heat storage layer is flashed into steam which is condensed into desalted water using an indirect heat exchanger cooled by saline water. The latent heat of condensation of the steam warms the saline water and effects evaporation of water therefrom in the form of vapor. The last mentioned water vapor is condensed into desalted water using a two-stage condenser, the first stage of which is an indirect heat exchanger cooled by saline feed water which is heated as a result producing warmed saline feed water that constitutes the saline water used for condensing the steam produced by flashing the brine from the heat storage layer of the pond.
    Type: Grant
    Filed: January 21, 1993
    Date of Patent: December 10, 1996
    Assignee: Ormat Turbines (1965) Ltd.
    Inventors: Joseph Weinberger, Uriyel Fisher, Gad Assaf, Benjamin Doron
  • Patent number: 5582680
    Abstract: A compact, transportable and self-contained apparatus for treating wastewater containing as impurities and pollutants various non-volatile (at water boiling points) fluids such as greases, oils and soaps, having a vessel/evaporator for receiving the wastewater, a heater below the evaporator to heat the wastewater admixture and boil off the water, a collector to draw off the non-volatile fluids from substantially the entire height of the water evaporator, and automatic refill/shutdown control devices for the apparatus.
    Type: Grant
    Filed: November 30, 1994
    Date of Patent: December 10, 1996
    Assignee: Raymond E. Vankouwenberg
    Inventors: Raymond E. Vankouwenberg, Robert D. Gendreau
  • Patent number: 5540813
    Abstract: Methods and apparatus are disclosed for purifying polymerized monovinyl aromatic compounds such as polystyrene by reducing the residual monomer content of the finished polymer, said methods and apparatus including a combination of heat exchangers and devolatilizers used in conjunction with a monovinyl aromatic polymerization reactor system.
    Type: Grant
    Filed: January 19, 1994
    Date of Patent: July 30, 1996
    Assignee: Fina Technology, Inc.
    Inventors: Jose M. Sosa, Robert M. Scates, James N. Weguespack, Bruce P. Blackmar, Scott W. Davis
  • Patent number: 5395483
    Abstract: A distillation apparatus by flashing and boiling of solution and condensing the resulting steam having a central rotating partitioned brine conduit with coupling to a two-disk centrifugal distributor and a wiping blade system in a chamber having at least one conically shaped wall heated by a condensing steam in a spirally formed conduit, and a surrounding annular spiral condenser. The vertical stacking of such conically shaped evaporators and annular spiral condensers with brine inflow and outflow through a central rotating partitioned tubular conduit make up the desalination tower. The solution flowing through the central tubular conduit to the centrifugal distributor is pressurized by the centrifugal force before flashing through spray nozzles. The flowing liquid film formed on the heated conical surface boils with further enhancement from thinning action due to a rotating wiping pivoting blade system.
    Type: Grant
    Filed: July 31, 1992
    Date of Patent: March 7, 1995
    Inventor: Osamah M. Al-Hawaj
  • Patent number: 5358681
    Abstract: An extruder having a reduced nip ratio and a process employing the same.
    Type: Grant
    Filed: April 29, 1993
    Date of Patent: October 25, 1994
    Assignee: Rohm and Haas Company
    Inventors: Robert E. Jerman, Paul J. Raymond, Sunil Satija
  • Patent number: 5306397
    Abstract: The apparatus is located almost completely under the surface of the sea. The vacua in the de-aeration and the evaporation chambers are generated by a vacuum pump and are maintained by the effects of a pressure reduction device at the inlet for warm seawater and a lifting pump at the outlet for brine. The de-aerator and the evaporator are laid out as heat exchangers and penetrated by heating tubes, which are flowed through passively by warm seawater. The immersion tube forming the steam compartment which is suspended vertically in the sea serves as a condenser. The condenser is cooled passively by cold seawater. The attachment to the bottom of the sea is performed by a single point mooring construction via an anchor chain at an anchor weight. The elevation of the water production unit is controlled automatically by means of an air chamber and an air compressor.
    Type: Grant
    Filed: October 28, 1992
    Date of Patent: April 26, 1994
    Assignee: PI Praktische Informatik GmbH
    Inventor: Edgar Schmidt
  • Patent number: 5290505
    Abstract: A method is indicated of recycling plastic sheet material coated with adhesive and available in chopped form. The method provides for separating the plastic from the adhesive. In a first method step the chopped sheet material (4) is introduced into a solvent bath (1) where the chopped sheet material (4) is moved for a predetermined dispersing time under mechanical action. The mechanical action preferably is exercized by rolling or kneading. In a second method step, the adhesive dispersed in the solvent is separated from the chopped sheet material (4) by mechanical action of forces--preferably by introducing squeezing forces in a conveyor screw.
    Type: Grant
    Filed: July 22, 1992
    Date of Patent: March 1, 1994
    Assignee: WNC-Nitrochemie GmbH
    Inventors: Gerhard Huber, Karl Pichl
  • Patent number: 5256707
    Abstract: In concentrating polymer solutions up to a desired specification level of residual solvents, encrustations can be prevented and the yield and the degree of purity can be increased, when the product is heated up under pressure, expanded through a restrictor element (3) with vapor formation into a first, preferably coiled flow pipe (7) and concentrated therein as far as possible, the mixture of vapors and polymer solution is whirled at an angle into a second flow pipe (9) in a sloping arrangement and fitted with self-cleaning elements (11, 12) and concentrated therein up to the desired level, and vapors and concentrate are separately discharged only downstream thereof.
    Type: Grant
    Filed: March 22, 1991
    Date of Patent: October 26, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Clemens Casper, Jorgen Weinschenck
  • Patent number: 5248387
    Abstract: An improved process and apparatus for producing concentrated kaolin slurries and spray dried kaolin particulates through the use of an arrangement where an evaporation system for producing concentrated slurries is coupled with a spray dryer such that off gases from the spray dryer are used to supply heat energy to the spray dryer and to the evaporation system.
    Type: Grant
    Filed: February 15, 1991
    Date of Patent: September 28, 1993
    Assignee: Niro A/S
    Inventor: Ove E. Hansen
  • Patent number: 5230773
    Abstract: The invention relates to a process for the recovery of heat and chemicals from a mixture of ashes and spent liquor by carrying out the final concentrating (2) of the liquor, and its feeding (8) into the soda recovery unit (5), under pressure and at a temperature higher than the atmospheric boiling point of the liquor. According to the invention, the ashes (1) are not mixed with the waste liquor (7) until after the final concentrating (2) of the liquor, and the mixture is further expansion evaporated (4) before the thus concentrated pressurized liquor is fed into the soda recovery unit (5).
    Type: Grant
    Filed: August 31, 1990
    Date of Patent: July 27, 1993
    Assignee: Oy Tampella AB
    Inventor: Pertti Petanen
  • Patent number: 5223088
    Abstract: An improved process and apparatus for producing concentrated kaolin slurries and spray dried kaolin particulates through the use of an arrangement where a system for producing concentrated slurries is coupled with a spray dryer such that off gases from the spray dryer are used to supply heat energy to the spray dryer and to the slurry concentrating system.
    Type: Grant
    Filed: October 11, 1991
    Date of Patent: June 29, 1993
    Assignee: NIRO A/S
    Inventor: Ove E. Hansen
  • Patent number: 5209828
    Abstract: A system and method of concentrating spent caustic at a refinery has a multi-stage flash drum for separating a spent caustic stream into an overhead output stream including vaporized water and volatile organic compounds, and a concentrated spent caustic output stream. The system also has a condenser for condensing the overhead output stream, and a separator for separating the condensed overhead output stream into a volatile organic compound stream, a liquid hydrocarbon stream and a water stream. The system further has an ejector for applying a vacuum to the flash drum to vaporize the spent caustic stream at a reduced temperature, and to the separator to remove the volatile organic compound stream. The volatile organic compounds are removed from the overhead of the separator through the ejector to a burner of a fired heater.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: May 11, 1993
    Assignee: Mobil Oil Corporation
    Inventors: Tai-Sheng Chou, Manuel Gonzalez
  • Patent number: 5200033
    Abstract: A method and device for removing organic compounds from soil, solids, sludges and other types of contaminated materials utilizing a non-rotating contactor which can be tightly sealed from air infiltration. Binders such as cement, lime, flyash or kiln dust may be added to the soil prior to treatment so as to aid in the volatilization of the volatile organics and to immobilize the non-volatile constituents in the treated solids. The contaminated materials are fed to a chamber with a movable rake therein and are subjected to temperatures sufficiently high to violatize the organic constituents. The volatilized contaminants are purged with small amounts of air or other non-condensible gas and with superheated steam. The organic constituents can be captured in a vapor phase or they can be condensed and captured in the condensed liquid.
    Type: Grant
    Filed: September 9, 1991
    Date of Patent: April 6, 1993
    Assignee: LWV Associates, Inc.
    Inventor: Leo Weitzman
  • Patent number: 5143579
    Abstract: The specification discloses a method for the treatment of black liquor from a kraft or soda pulping process which comprises forcibly conveying the black liquor through an elongate conduit containing at least one vent at a position along its length while subjecting the black liquor to a working action and maintaining the temperature of the black liquor at least about C. so that the black liquor is compressed and mixed as it is conveyed through the conduit to promote the separation of liquid components from the black liquor into the vent by expression and vaporization. As a result, the solids concentration of the material may be increased to provide an improved quality fuel for soda recovery boilers. The process is advantageously carried out using a vented screw extruder which is equipped to supply heat to the black liquor from the screw interiors and barrel housing to promote vaporization of volatiles and to maintain the flowability of the material as it is conveyed through the extruder.
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: September 1, 1992
    Assignee: International Paper Company
    Inventors: Jasper H. Field, Vladimir B. Lesokhin
  • Patent number: 5125824
    Abstract: A method of degassing a molten mass of thermoplastic, plastics material containing residual monomers and a twin-screw extruder capable of effecting such degassing. A molten mass of plastics material and a stripping agent are intermixed at a pressure which prevents the stripping agent from changing from liquid to gas at the temperature of the molten mass. The pressure necessary is achieved by the use of a pressure restrictor, which is yoke-shaped and is connected to the extruder housing in a force-fitting manner using centering means but which effectively blocks the processing chamber of the extruder downstream thereof to the molten material with the exception of a maximum of two throughbores for such material.
    Type: Grant
    Filed: July 3, 1991
    Date of Patent: June 30, 1992
    Assignee: Hermann Berstorff Maschinenbau GmbH
    Inventor: Holger Schaarschmidt
  • Patent number: 5102594
    Abstract: The invention relates to a process for the processing of a thermoplastic polycondensation polymer by supplying the polymer in finely distributed form to a first vented extruder in which the polymer is devolatilized at a temperature below its melting temperature. The polymer is then placed in a second extruder where the polymer is transported below the melting temperature of the polymer over a first length of the screw from the inlet of the extruder, with constant evacuation of volatile components by means of a vacuum exhausting device at a vacuum of less than 10 mbar and the polymer is compressed and melted over a second length of the screw and then leaves the extruder as an end product of a semimanufacture.
    Type: Grant
    Filed: January 10, 1990
    Date of Patent: April 7, 1992
    Assignee: Stamicarbon B.V.
    Inventors: Rudolf J. H. Burlet, Jozef M. H. Lemmens
  • Patent number: 5084134
    Abstract: A process for the devolatilization of polymer solutions including:(a) feeding the solution to a zone of indirect thermal exchange in which the ratio between the surface of thermal exchange and the flow per hour of the solution is over 80 m.sup.2 /m.sup.3 /h;(b) moving the solution forward into each channel at a speed below 0.5 mm/second;(c) keeping the solution of the polymer in each channel for about 120-200 seconds; and(d) separating the volatile components from the devolatilized polymer solution.
    Type: Grant
    Filed: January 16, 1991
    Date of Patent: January 28, 1992
    Assignee: Montedipe S.r.L.
    Inventors: Andrea Mattiussi, Claudio Buonerba, Franco Balestri, Dino Dall'Acqua, Savino Matarrese, Italo Borghi
  • Patent number: 5003001
    Abstract: Ionically crosslinked ethylene copolymers prepared by mixing a carboxyl-containing copolymer with an aqueous metal salt solution in the reaction zone of a twin-screw extruder and transferring the product to a devolatilization zone, and are used as adhesion promoters, injection molded articles or laminating films.
    Type: Grant
    Filed: June 14, 1989
    Date of Patent: March 26, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Norbert Hasenbein, Lothar Schlemmer, Thomas Muehlenbernd, Gernot Koehler
  • Patent number: 4981555
    Abstract: The solutions are concentrated by multiple-effect evaporation in indirectly heated evaporators. The highest concentration of the solution is reached in a final evaporator stage, which is heated with live steam. The final evaporators stage includes two to four falling-film evaporators, all of which are heated with live steam. The falling-film evaporators are consecutively flown through by the solution. Vapor is withdrawn from that falling-film evaporator which is the first to be supplied with the solution and at least part of said vapor is directly contacted with the solution as it flows down through the heating zone of at least one other evaporator of the final stage. From that falling-film evaporator of the final stage which is the first to be supplied with the solution the vapor may be fed to all other evaporators of the final stage.
    Type: Grant
    Filed: September 21, 1989
    Date of Patent: January 1, 1991
    Assignee: Metallgesellschaft AG
    Inventors: Klaus Hohmann, Manfred Mai
  • Patent number: 4963231
    Abstract: Process for the evaporative concentration of liquids. Vaporization is carried out by indirect heat exchange with a heating fluid in an evaporator. The vapor produced in the evaporator is thereafter condensed in a condenser by indirect heat exchange with a cooling liquid which is mainly composed of the liquid to be concentrated or the liquid which has already been concentrated in the evaporator. The vapor pressure over the cooling liquid in the condenser may be lowered by causing gas to flow in contact with the cooling liquid.
    Type: Grant
    Filed: June 13, 1988
    Date of Patent: October 16, 1990
    Assignee: Ahlstromforetagen Svenska AB
    Inventor: Rolf Ryham
  • Patent number: RE35283
    Abstract: A highly efficient distillation unit is provided for heating water and condensing the generated steam to remove the contaminants from the water. Efficiency is enhanced by providing a compact air cooled fin-and-tube heat exchanger which removes heat from the steam, with a powered blower passing air by the fins. A removable bowl which houses the evaporating water is suspended from a rod biased toward its upper position. Mechanical linkage interconnects the rod and a valve which controls incoming water flow to the bowl. The valve closure member is incrementally moved from an opened position to a closed position as a function of the weight of the water in the heating bowl. A low density electrical heating element is powered with from 40 to 55 watts per square inch of submerged heating element exterior surface. The bowl is configured to have a large surface area of heated water to heater input power, thereby further maximizing efficiency.
    Type: Grant
    Filed: November 21, 1991
    Date of Patent: June 25, 1996
    Inventor: Arthur R. Helmich