To Distillation Column Patents (Class 203/96)
  • Patent number: 9272229
    Abstract: The invention provides systems and methods for the pre-concentration of a target molecule from feed solution comprising a low concentration of the target molecule.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: March 1, 2016
    Assignee: Algenol Biotech LLC
    Inventors: Benjamin Moll, Edwin Malkiel, Rong Dong
  • Publication number: 20140202847
    Abstract: The present invention relates to a process for treating polyolefin granules in a treatment vessel comprising the steps of: —Providing a bed of granules in liquid in said treatment vessel —Withdrawing a first stream of liquid from said treatment vessel, wherein said first stream of liquid contains hydrocarboneous compounds —introducing a first stream of vapour into said treatment vessel —Withdrawing a second stream of vapour from said treatment vessel wherein said second stream of vapour contains volatile hydrocarboneous compounds —Recovering the granules from said treatment vessel wherein said first stream of vapour has a temperature from Tb to Tb+10° C., wherein Tb is the boiling point of the liquid at the applied pressure, and said first stream of vapour produces an upwards rising vapour stream in said treatment vessel, the superficial vapour velocity of which is no more than 0.2 m/s, and a plant suitable for conducting said process.
    Type: Application
    Filed: November 12, 2012
    Publication date: July 24, 2014
    Applicant: BOREALIS AG
    Inventors: Michiel Bergstra, Kai Hagane, Manfred Jarzombek, Pablo Ivan Aguayo Arellano
  • Patent number: 8696872
    Abstract: An improved water desalination system is disclosed, in which contaminated water such as seawater or brackish water is preheated and fed into a primary pressure vessel through a distribution head. The seawater is distributed from the distribution head over a non-adherent surface such as a plurality of silicone chords hanging below a distribution tank or a cone- and cylindrical-shaped surface. The water is exposed to a high temperature steam environment in the chamber to cause at least a portion of the water in the contaminated water to evaporate, while the remaining concentrated salts from the contaminated water fall to the bottom of the chamber. A portion of the steam in the primary pressure vessel is withdrawn to be condensed into fresh water. The energy withdrawn with the steam extracted from the primary pressure vessel is made up by a supplemental energy apparatus, such as a steam generator.
    Type: Grant
    Filed: June 19, 2012
    Date of Patent: April 15, 2014
    Assignee: Water Desalination International, Inc.
    Inventor: Frank Passarelli
  • Patent number: 8652304
    Abstract: The present invention is directed to an enhanced process for separating dissolved and suspended solids from valuable or harmful liquids and more particularly to improving the operational aspects and separation efficiency of treating certain water miscible fluids including those used for oil and gas processing such as glycols, as well as automobile and aircraft fluids, that have become contaminated with dissolved and/or suspended solid matter.
    Type: Grant
    Filed: June 15, 2009
    Date of Patent: February 18, 2014
    Assignees: Prime Services Trustee Limited, VBW Trustees No. 2 Limited
    Inventor: Craig Nazzer
  • Patent number: 8585870
    Abstract: A process for co-manufacture of acrylonitrile and hydrogen cyanide comprises combining a stream comprising hydrogen cyanide and an acrylonitrile reactor product stream, to produce a combined product stream, having a ratio of acrylonitrile to hydrogen cyanide of about 9 to 1 or less, which can be varied; and treating the combined product stream in a recovery/purification system of acrylonitrile process wherein pH is controlled by addition of an acid to prevent HCN polymerization. The ratio of acrylonitrile to hydrogen cyanide is generally between 2 to 1 and 9 to 1. The stream comprising hydrogen cyanide is advantageously a hydrogen cyanide product stream from a hydrogen cyanide synthesis reactor.
    Type: Grant
    Filed: March 5, 2008
    Date of Patent: November 19, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventors: Brent E. Basham, Richard Thomas Stimek
  • Publication number: 20130256117
    Abstract: Process for the purification of an aqueous stream coming from the Fischer-Tropsch reaction, which comprises feeding a part of said aqueous stream to a saturator, feeding a part of said aqueous stream to a distillation and/or stripping column, feeding the aqueous stream leaving the head of said distillation and/or stripping column to said saturator. Said process allows at least a part of the aqueous stream coming from the Fischer-Tropsch reaction to be used as process water in the synthesis gas production plant, subsequently sent to the Fischer Tropsch plant for the production of hydrocarbons.
    Type: Application
    Filed: October 6, 2010
    Publication date: October 3, 2013
    Inventors: Oliviero Perotti, Serafino Tonani, Palma Pizzocchi, Ines Perotti
  • Publication number: 20130168226
    Abstract: The invention relates to a method and a device with the aid of which hydrogen halide and water are removed from biomass hydrolyzates containing halogen acid. The core of the invention is an evacuated container (B1), which is continuously supplied with a heat-transfer medium and which is completely filled with the heat-transfer medium in a part. In said evaporation chamber, the biomass hydrolyzate is likewise continuously introduced. In the container (B1), heat is transferred from the heat-transfer medium to the hydrolyzate, wherein hydrogen halide and water are continuously evaporated. The remaining hydrolyzate particles are continuously discharged with the cooled heat-transfer medium and continuously removed by means of the heat-transfer medium and continuously separated from said heat-transfer medium. The invention described can also be used to treat other mixtures or solutions for the purpose of evaporation.
    Type: Application
    Filed: July 12, 2011
    Publication date: July 4, 2013
    Inventors: Frank Kose, Matthias Schmidt
  • Patent number: 8460517
    Abstract: Methods and apparatuses for extractive distillation using internal addition of steam to an extractive distillation column from a reboiler are described herein. The apparatuses include an extractive distillation column, a reboiler (for example, a kettle reboiler) coupled to the extractive distillation column, and a steam input line. The steam input line is coupled to an internal steam sparger device of the reboiler. Methods utilizing the apparatuses to perform extractive distillation of a hydrocarbon feed stream are also described herein.
    Type: Grant
    Filed: February 17, 2010
    Date of Patent: June 11, 2013
    Assignee: GTC Technology US LLC
    Inventors: Mircea Cretoiu, Andrei Cimpeanu
  • Patent number: 8337672
    Abstract: The invention relates to the oil processing industry and can be used for producing vacuum in a vacuum petroleum distillation column. The inventive method involves pumping out a vapor-gas medium from the column by of a gas-gas ejector in such a way that a vapor-gas mixture is formed at the entry thereof and supplying said mixture to a condenser for producing a gas mixture and a vapor phase condensate. The gas mixture is supplied from the condenser to a liquid-gas jet apparatus and the condensate is delivered to an additional separator. A hydrocarbon-containing condensate is removed from the additional separator for the intended use thereof and a water-containing condensate is fed to a steam generator for producing steam by supplying heat of a hot distillate evacuated from the vacuum column. The thus obtained steam is used in the gas-gas ejector as a high-pressure gas.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: December 25, 2012
    Inventor: Valery Grigorievich Tsegelsky
  • Patent number: 8328994
    Abstract: Processes for the recovery of ethanol, useful as a fuel, from various cellulosic feedstock materials fermented to produce ethanol-containing beer are disclosed. The present invention provides a method and a system for ethanol recovery from highly viscous fermented citrus waste biomass. The systems overcome various challenges, including effectively stripping the ethanol from biomass beer in an energy efficient and economical manner that may allow for the further dehydration of the ethanol/water mix in a traditional rectifier distillation column. In certain embodiments, a series of flash stages and beer stripping columns are capable of operating with highly viscous slurries and/or feedstocks containing high levels of solids.
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: December 11, 2012
    Inventor: David A. Stewart
  • Publication number: 20120253077
    Abstract: The present invention relates to a mixture of ethylenediamine (EDA) and N-methyl-ethylenediamine (Me-EDA) with a low content of Me-EDA, which comprises at least 99.5% by weight of ethylenediamine, and wherein the concentration of N-methylethylenediamine is in the range from 0.005 to 0.15% by weight. The present invention further relates to a process for distillative workup of a mixture comprising EDA, Me-EDA and water, by introducing the mixture into a distillation column which is operated at a column top pressure of 10 mbar to 4 bar, wherein the weight ratio of water to ethylenediamine in the mixture used is a*X:Y where X is the proportion by weight of water and Y is the proportion by weight of ethylenediamine at the azeotropic point of a binary mixture of water and ethylenediamine at the column top pressure in question, and a is a real number with a value of 0.9 or more.
    Type: Application
    Filed: November 30, 2010
    Publication date: October 4, 2012
    Applicant: BASF SE
    Inventors: Michael Jödecke, Jörg Pastre, Hugo Dirmstein
  • Patent number: 8226800
    Abstract: An improved water desalination system is disclosed, in which contaminated water such as seawater or brackish water is preheated and fed into a primary pressure vessel through a distribution head. The seawater is distributed from the distribution head over a non-adherent surface such as a plurality of silicone chords hanging below a distribution tank or a cone- and cylindrical-shaped surface. The water is exposed to a high temperature steam environment in the chamber to cause at least a portion of the water in the contaminated water to evaporate, while the remaining concentrated salts from the contaminated water fall to the bottom of the chamber. A portion of the steam in the primary pressure vessel is withdrawn to be condensed into fresh water. The energy withdrawn with the steam extracted from the primary pressure vessel is made up by a supplemental energy apparatus, such as a steam generator.
    Type: Grant
    Filed: December 15, 2008
    Date of Patent: July 24, 2012
    Assignee: Water Desalination International, Inc.
    Inventor: Frank Passarelli
  • Publication number: 20120168298
    Abstract: The invention relates to a method for reprocessing waste acid from methods for producing nitro-aromatics, in particular for producing dinitrotoluene (DNT) or trinitrotoluene (TNT), to recover concentrated and purified sulfuric acid and nitric acid, wherein in a first stage, the waste acid is separated in a stripping column countercurrently with water vapor from the bottom of the stripping column into at least one vapor phase, which contains nitric acid and possibly nitro-organics, and a pre-concentrated sulfuric acid, and the vapor phase and the pre-concentrated sulfuric acid are condensed and/or reprocessed in downstream method stages, wherein in the first stage of the method, in addition to the stripping, according to the invention the nitric acid contained in the stripping vapor is concentrated in the presence of additional concentrated sulfuric acid so that nitric acid in a highly concentrated form suitable for feeding back into the nitriding process is obtained directly in the first stage.
    Type: Application
    Filed: September 8, 2010
    Publication date: July 5, 2012
    Applicant: DE DIETRICH PROCESS SYSTEMS GMBH
    Inventors: Gottfried Dichtl, Harald Steeg
  • Publication number: 20120145528
    Abstract: One exemplary embodiment can be an apparatus for treating a hydrocarbon stream having one or more compounds with a boiling point of about 140° to about 450° C. The apparatus can include an extraction zone and a regeneration zone. The extraction zone can include at least one settler. Each settler can have a height and a length. Typically the length is greater than the height. Also, the settler can form a boot, which can be adapted to receive a feed at one end. The regeneration zone may include a regenerator for an ionic liquid. The regenerator can include a column adapted to provide a regenerated ionic liquid to the extraction zone.
    Type: Application
    Filed: February 17, 2012
    Publication date: June 14, 2012
    Applicant: UOP LLC
    Inventors: David Nathan Myers, Manuela Serban, Kurt Vanden Bussche, Alakananda Bhattacharyya, Luigi Laricchia, John Patrick Brady
  • Patent number: 8080139
    Abstract: The present invention relates to a method of anhydrous ethanol production using circulation by multiple towers' alternation, the procedure includes the steps of heating, adsorption, internal circulation, vacuum suction, washing and resolving etc. The method can prolong the life of adsorbent, reduce the heat exchanger's surface, cooling water, the equipment investment and energy consumption, provide high ethanol recovery rate and high dehydration, and protect environment.
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: December 20, 2011
    Inventors: Yaling Zhong, Yuming Zhong
  • Patent number: 8029650
    Abstract: A method for purifying used antifreeze is disclosed. An antifreeze recycling systems uses a simple-distillation apparatus adapted to distill clean antifreeze from used antifreeze. A novel scraper blade is used in the simple-distillation apparatus. Also, antifreeze recycling methods that minimize waste and generate nontoxic, landfillable waste are provided. An antifreeze product produced by the present method, and a nontoxic, landfillable sludge product produced by the present method, are disclosed.
    Type: Grant
    Filed: September 26, 2007
    Date of Patent: October 4, 2011
    Inventor: Dale L. Letcher
  • Publication number: 20110233045
    Abstract: Provided is a method of purifying hydrochloric acid by removing an organic substance having a boiling point of ?25° C. to 120° C. under atmospheric pressure from a first organic substance-containing hydrochloric acid that contains the organic substance and has a hydrogen chloride concentration higher than an azeotropic hydrogen chloride concentration under atmospheric pressure. The method includes the step of subjecting a second organic substance-containing hydrochloric acid to distillation using a distillation tower under atmospheric pressure, to distill out the organic substance from a top of the distillation tower. The second organic substance-containing hydrochloric acid is obtained by mixing the first organic substance-containing hydrochloric acid and water or dilute hydrochloric acid and has the hydrogen chloride concentration lower than the azeotropic hydrogen chloride concentration under atmospheric pressure.
    Type: Application
    Filed: November 24, 2009
    Publication date: September 29, 2011
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Toyomitsu Shimizu, Norihito Omoto, Shoichi Futagami, Sadayuki Miyamura
  • Patent number: 8021520
    Abstract: The invention relates to a device and method for preparing liquid from solid materials such as medicinal materials. It includes liquid and materials for preparing the liquid at the beginning and the end of the process. The device uses a steam generator, an intermediate switch valve and a material chamber, which are connected sequentially with pipes, and further includes an outlet pipe, which is at the bottom of the material chamber. The method involves the steps of: distillation and absorption; immersion; and repetition. The device and method for preparing liquid alternates the distillation and immersion steps, which reduces harmful substance in the prepared liquid that would otherwise occur by conventional methods. The method not only extracts soluble effective matter, but also reduces loss of volatile effective matter. Ultimately, the method makes the steps for preparing liquid simple and clear, and it can prepare liquid quantitatively, effectively and without pasty and shrinkable characteristics.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: September 20, 2011
    Assignee: Shenzhen Zofu Technology Co., Ltd
    Inventor: Linlin Yao
  • Patent number: 7695594
    Abstract: A distillation process for separating a target component from a mixture containing a solvent and the target includes the steps of flashing off a vapor mixture of said solvent and said target in an evaporator, separating said target from said vapor mixture, and providing additional solvent to said evaporator to maintain the temperature of said evaporator substantially below the boiling point of said target. The process also includes the step of removing accumulated non-volatile components from said evaporator by allowing the non-volatile components to precipitate from a mixture of the target and the solvent.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: April 13, 2010
    Inventor: Arthur F. Clark
  • Patent number: 7692031
    Abstract: A method of separating propylene oxide from a mixture (M) comprising propylene oxide and methanol, said method comprising: (i) introducing said mixture (M) into an extractive distillation column; (ii) additionally introducing an extracting solvent into said extractive distillation column; (iii) distilling propylene oxide overhead from said extractive distillation column as top stream; (iv) withdrawing a bottoms stream from said extractive distillation column; (v) compressing the top stream obtained overhead in (iii) by means of at least one compressor to give a compressed vapor.
    Type: Grant
    Filed: July 6, 2005
    Date of Patent: April 6, 2010
    Assignees: BASF Aktiengesellschaft, The Dow Chemical Company
    Inventors: Hans-Georg Goebbel, Henning Schultz, Peter Schultz, Renate Patrascu, Malte Schulz, Meinolf Weidenbach
  • Patent number: 7690445
    Abstract: A method and apparatus for treating for disposal oil contaminated substrates, such as drill cuttings from drilling with an oil-based mud, by steam distillation. If necessary, the contaminated substrate 10 can be pretreated with an emulsion breaker 14. The contaminated substrate 10 can be treated with steam 16 in a first mixing still 12. The substrate can be optionally treated with a second steam source 20 in a second mixing still 18. The steam provides heat to vaporize the oil, moisture to treat the substrate and water to the reaction mixture. Recoverable constituents in the vapor can be condensed in a vapor collection system 24. The treated substrate 22 is essentially free of oil and can have a controlled water content. The process exhibits low energy consumption, rapid treatment, compact equipment and a high degree of process control.
    Type: Grant
    Filed: October 27, 2004
    Date of Patent: April 6, 2010
    Assignee: Racional Energy & Environment Co.
    Inventor: Ramon Perez-Cordova
  • Patent number: 7594979
    Abstract: A process of separating a purified propylene oxide from a crude epoxidation product produced, preferably, in an epoxidation reaction of propylene with hydrogen peroxide. The process involves removing bulk water, bulk methanol, and unreacted propylene from the crude epoxidation product and thereafter subjecting the resulting propylene oxide product to extractive distillation with water as an extraction solvent. Under distillation conditions, including a bottoms temperature of greater than about 55° C. and less than about 75° C., an overhead or side-cut distillate stream containing a purified propylene oxide is obtained with low yield loss of propylene oxide to propylene glycols and other glycol heavies. The purified propylene oxide can be further purified in a finishing distillation to obtain propylene oxide meeting commercial grade purity requirements.
    Type: Grant
    Filed: March 4, 2004
    Date of Patent: September 29, 2009
    Assignee: Dow Global Technologies, Inc.
    Inventors: Renate Patrascu, Sabrina Astori, Meinolf M. Weidenbach
  • Patent number: 7442348
    Abstract: A sulfur-bearing residue treatment system is provided for the recovery of valuable organic components and the reduction of capital costs and operating costs. The treatment system involves the use of a stripping vessel in conjunction with a heating apparatus. All elements of the treatment system may be coupled together to form one integral piece of equipment.
    Type: Grant
    Filed: June 17, 2005
    Date of Patent: October 28, 2008
    Assignee: Rohm and Haas Company
    Inventors: Curtis Instad Carlson, Jr., Michael Stanley DeCourcy, Jamie Jerrick John Juliette, Thomas Albert Kaminski, Nelson Ivan Quiros, Paul Benjamin Schladenhauffen
  • Patent number: 7258766
    Abstract: A method for collecting acrylic acid is provided, which includes the step of collecting acrylic acid using an aqueous medium from a reaction gas containing acrylic acid obtained by catalytic vapor-phase oxidation of propane, propylene, and/or acrolein, the step being conducted so as to satisfy the following formula (1) (B/A)<1.25 (1) wherein A represents a weight fraction of acrylic acid to all condensable ingredients in the reaction gas before collecting acrylic acid and B represents a weight fraction of acrylic acid in bottoms of a collection device used in the step of collecting. According to the method, acrylic acid can be efficiently collected from the reaction gas containing acrylic acid obtained by catalytic vapor-phase oxidation.
    Type: Grant
    Filed: April 21, 2004
    Date of Patent: August 21, 2007
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Shuhei Yada, Kimikatsu Jinno, Yasushi Ogawa, Yoshiro Suzuki
  • Patent number: 7105687
    Abstract: In accordance with the invention, propylene oxide is formed by reaction of propylene and hydrogen peroxide or by reaction of propylene, oxygen and hydrogen in methanol solvent, methanol and methyl formate are separated from propylene oxide by extractive distillation wherein the aqueous bottoms from methanol recovery distillation is used as extractive distillation solvent after first having been neutralized.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: September 12, 2006
    Assignee: Lyondell Chemical Technology, L.P.
    Inventor: Te Chang
  • Patent number: 6956101
    Abstract: Process and installation for extracting a monomer from an aqueous broth of a polymer, in which, after the broth has been heated, the broth is subjected to a depressurization in a depressurization chamber and is then introduced into a vertical column, divided into several chambers, on which are superimposed perforated plates, where the broth is flushed with an ascending stream of inert gas.
    Type: Grant
    Filed: March 1, 2001
    Date of Patent: October 18, 2005
    Assignee: Solvay (Societe Anonyme)
    Inventors: Philippe Taranti, Mario Golin
  • Patent number: 6852199
    Abstract: A process is provided for the distillative separation of pentene nitrile isomers which have a relative volatility alpha ranging from 1.0 to 1.3 in the pressure range from 1 to 500 kPa, wherein the distillation is carried out in the presence of a liquid diluent which forms with the pentene nitrile isomers, under the same pressure conditions, azeotropes whose relative volatility alpha is higher than that of the pentene nitrile isomers to be separated.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: February 8, 2005
    Assignee: BASF Aktiengesellschaft
    Inventors: Tim Jungkamp, Dagmar Pascale Kunsmann-Keitel, Robert Baumann, Peter Bassler, Wolfgang Siegel
  • Patent number: 6844480
    Abstract: This invention is directed to a method of removing dimethyl ether from an olefin stream. Dimethyl ether is removed from the olefin stream by first separating the olefin stream into a first stream comprising dimethyl ether and lighter boiling point compounds, and a second stream comprising C4+ olefin and higher boiling point hydrocarbons. The dimethyl ether is then separated from the first stream using extractive distillation.
    Type: Grant
    Filed: June 27, 2002
    Date of Patent: January 18, 2005
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: James R. Lattner, David R Lumgair, Jr., Jeffrey A. Kabin, Michael Peter Nicoletti
  • Patent number: 6843890
    Abstract: A process of treating waste solvent acetonitrile streams which contain at least one water extractable impurity such as isopropyl acetate to remove substantially all of the impurity by distilling the waste solvent acetonitrile in the presence of water for a time sufficient to allow the water extractable impurity to be extractively distilled from the acetonitrile. In preferred embodiments of the present invention the feed may contain either a mixture of waste solvent acetonitrile and crude acetonitrile or crude acetonitrile free of hydrogen cyanide by itself.
    Type: Grant
    Filed: July 23, 1999
    Date of Patent: January 18, 2005
    Assignee: The Standard Oil Company
    Inventor: Sanjay Purushottam Godbole
  • Publication number: 20040026228
    Abstract: A process for cleaning apparatus in which (meth)acrylic acid-containing organic solvents have been treated and/or generated and contain fouling and/or polymer and residues of organic solvent, in which the apparatus contents are subjected to a steam distillation in the apparatus.
    Type: Application
    Filed: May 29, 2003
    Publication date: February 12, 2004
    Applicant: BASF Aktiengesellschaft
    Inventors: Volker Diehl, Ulrich Jager, Jurgen Schroder, Joachim Thiel
  • Patent number: 6623604
    Abstract: Methods of recovering free fatty acids having a low ester content from alkanol-containing solutions and oil mixtures containing tocopherols are disclosed which involve atmospheric or vacuum stripping at low temperatures. The recovered fatty acids have a high acid value, and have high commercial value in the production of high quality (high acid value) products, e.g., dimerized fatty acids, useful in polyamide resins.
    Type: Grant
    Filed: June 5, 2000
    Date of Patent: September 23, 2003
    Assignee: Cognis Corporation
    Inventors: A. Fred Elsasser, C. William Blewett
  • Patent number: 6613197
    Abstract: A method and apparatus for isolation of a barely volatile organic compound in a sample suspected to contain the same, e.g. a dioxin, which includes continuously adding superheated steam and a volatile and hardly water-soluble/water-insoluble solvent to a liquid or solid sample suspected to contain said organic compound to be isolated, a solid sample being dissolved in said solvent which can dissolve said organic compound to be isolated, distilling off an azeotropic mixture of said organic compound and said solvent by steam distillation, separating a solvent phase of said solvent dissolving said organic compound and said water phase, and recovering quantitatively said organic compound from said solvent. The dioxins are then further subjected to analysis, for example, GC, HRGC-MS and the like.
    Type: Grant
    Filed: September 13, 2000
    Date of Patent: September 2, 2003
    Assignees: Laboratory of Creative Science Co., Ltd.
    Inventor: Junichi Iwamura
  • Patent number: 6521097
    Abstract: A process for separating hydrogen chloride from a mixture including an N-(C1-C18)-alkyl-2-pyrrolidone and hydrogen chloride by distilling the mixture including an N-(C1-C18)-alkyl-2-pyrrolidone and hydrogen chloride at from 100 to 220° C. and from 50 to 850 hPa in the presence of water in a distillation column, condensing the water as water-hydrogen chloride azeotrope at the top by cooling, returning the water-hydrogen chloride azeotrope to the distillation column, separating off gaseous hydrogen chloride at the top and taking off the N-(C1-C18)-alkyl-2-pyrrolidone from the bottom.
    Type: Grant
    Filed: June 27, 2001
    Date of Patent: February 18, 2003
    Assignee: Clariant GmbH
    Inventor: Holger Geissler
  • Patent number: 6478930
    Abstract: A distillation procedure is provided for the separation of impurities from organic materials such as glycols and glycol ethers whereby a liquid stripping component is interfaced into a distillation column with or below the organic material introduction, heat being provided by a reboiler, the stripping component and impurities being removed overhead.
    Type: Grant
    Filed: August 23, 2001
    Date of Patent: November 12, 2002
    Assignee: Arco Chemical Technology, L.P.
    Inventor: Vijai P. Gupta
  • Publication number: 20020153310
    Abstract: A process for pretreating a oily/water stream for closed loop dilution steam production within an ethylene plant using countercurrent multi-stage extraction to remove both free and dissolved organic solutes from in-situ (net) quench water with an organic solvent to yield an aqueous raffinate containing only residual amounts of organic solute. The raffinate is steam stripped to remove the residual organic solutes, yielding a pretreated quench water stream substantially free of organic material. The pretreated quench water is suitable for reuse to generate dilution steam (without fouling). The (solvent) extract from extraction is regenerated in a solvent regenerator having an overhead stream for purging light ends, a bottom stream for purging heavy ends, and a heart-cut side stream for recycling solvent to the extractor.
    Type: Application
    Filed: February 12, 2002
    Publication date: October 24, 2002
    Inventors: Sabah Kurukchi, Joseph Gondolfe
  • Publication number: 20020134661
    Abstract: A process for separating water from methanol in an aqueous methanol initial mixture, comprising subjecting said mixture to azeotropic distillation in the presence of sufficient added methyl acrylate to form an azeotrope with most of the methanol in said initial mixture such that a substantial proportion of methanol in the initial mixture is removed as an azeotrope of methanol and methyl acrylate in the overhead vapors resulting from said distillation and a major proportion of water in said initial mixture is removed in the liquid residue of said distillation.
    Type: Application
    Filed: January 22, 2001
    Publication date: September 26, 2002
    Inventors: Benjamin A. Gilbert, Jeffrey R. Kirkpatrick, John C. McCall, Kenneth A. Windhorst
  • Patent number: 6379507
    Abstract: A process for producing methylal that involves feeding a liquid containing methanol, formaldehyde and water to an uppermost reactor of at least four solid acid catalyst-filled reactors which are each externally connected to an intermediate portion of a distillation column; and forcibly circulating a liquid containing methanol, formaldehyde, water and produced methylal in a temperature range of 80° C. to 100° C.
    Type: Grant
    Filed: August 3, 1999
    Date of Patent: April 30, 2002
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Seinosuke Satoh, Yukio Tanigawa
  • Patent number: 6375804
    Abstract: The present invention provides a distillation separation method whereby tertiary butyl acetate is separated by distillation as an overhead stream from a bottoms acetic acid stream with the proviso that water is incorporated in the system such that the bottoms acetic acid stream contains water in amount of 0.1 to 5 wt %.
    Type: Grant
    Filed: April 10, 2001
    Date of Patent: April 23, 2002
    Assignee: ARCO Chemical Technology, L.P.
    Inventor: Vijai P. Gupta
  • Patent number: 6358373
    Abstract: The preparation of polyamides, their oligomers or mixtures thereof, where appropriate with other reaction products, takes place by reacting amino nitrites (A) and, where appropriate, other polyamide-forming monomers and/or oligomers with water (D) in a reactive distillation, wherein the reaction product (P) is discharged from the bottom of the reactive distillation apparatus, and ammonia (N) which is produced and, where appropriate, other low molecular weight compounds which are produced, and water, are taken off overhead.
    Type: Grant
    Filed: August 23, 2000
    Date of Patent: March 19, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Martin Leemann, Volker Hildebrandt, Heino Thiele, Stefan Espig
  • Publication number: 20020014399
    Abstract: The present invention relates to a process for separating hydrogen chloride from a mixture comprising an N-(C1-C18)-alkyl-2-pyrrolidone and hydrogen chloride by distilling the mixture comprising an N-(C1-C18)-alkyl-2-pyrrolidone and hydrogen chloride at from 100 to 220° C. and from 50 to 850 hPa in the presence of water by means of a distillation column, condensing the water as water-hydrogen chloride azeotrope at the top by cooling, returning the water-hydrogen chloride azeotrope to the distillation column, separating off gaseous hydrogen chloride at the top and taking off the N-(C1-C18)-alkyl-2-pyrrolidone from the bottom.
    Type: Application
    Filed: June 27, 2001
    Publication date: February 7, 2002
    Applicant: Clariant GmbH
    Inventor: Holger Geissler
  • Publication number: 20020000366
    Abstract: A distillation procedure is provided for the separation of impurities from organic materials such as glycols and glycol ethers whereby a liquid stripping component is interfaced into a distillation column with or below the organic material introduction, heat being provided by a reboiler, the stripping component and impurities being removed overhead.
    Type: Application
    Filed: August 23, 2001
    Publication date: January 3, 2002
    Applicant: ARCO CHEMICAL TECHNOLOGY, L.P.
    Inventor: Vijai P. Gupta
  • Patent number: 6332958
    Abstract: An apparatus and a method for removing residual monomers from a slurry containing a polyvinyl chloride. The apparatus has a cylindrical tower with plural perforated plates provided in a vertical direction in the tower, plural chambers formed on the perforated plates serving as their bottom surface, slurry introducing portions provided at two or more of the chambers, flow-down sections provided between the perforated plates to allow the slurry to sequentially flow down from the perforated plate of an upper chamber to the perforated plate of a lower chamber, a steam introducing port at a bottom portion of the tower, a deaerating port at a top portion of the tower, a slurry discharging port at a chamber below a chamber having the slurry introducing port, and hot water ejectors directly under the perforated plates directed at least toward the lower surface of the perforated plates.
    Type: Grant
    Filed: August 19, 1999
    Date of Patent: December 25, 2001
    Assignee: Chisso Corporation
    Inventors: Etsuro Matsuda, Yuichi Ito, Toshinobu Kurazono
  • Patent number: 6332949
    Abstract: A process for concentrating spent sulphuric acids particularly sulphuric acids which arise during the nitration of hydrocarbons with nitric acid in the presence of sulphuric acid, wherein single- or multi-stage concentration is effected under vacuum.
    Type: Grant
    Filed: March 30, 1999
    Date of Patent: December 25, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heiko Beckhaus, Jürgen Münnig, Wolfgang Lorenz, Karl Schumacher
  • Patent number: 6306263
    Abstract: A distillation procedure is provided for the separation of impurities from organic materials such as glycols and glycol ethers whereby a liquid stripping component is interfaced into a distillation column with or below the organic material introduction, heat being provided by a reboiler, the stripping component and impurities being removed overhead.
    Type: Grant
    Filed: March 31, 1999
    Date of Patent: October 23, 2001
    Assignee: Arco Chemical Technology, L.P.
    Inventor: Vijai P. Gupta
  • Patent number: 6264800
    Abstract: A procedure is provided for the separation of close boiling impurities from products which have slightly higher polarity than the impurities, for example, separation of di-propylene glycol di-tert-butyl ether (DE) from di-propylene glycol mono-tert-butyl ether (DPTB) by distillation, water or steam being used as stripping component with heat provided by a reboiler.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: July 24, 2001
    Assignee: Arco Chemical Technology, L.P.
    Inventor: Vijai P. Gupta
  • Patent number: 6228226
    Abstract: A process for working up crude, liquid vinyl acetate feed containing acetic acid, water and ethyl acetate and optionally smaller amounts of other impurities by distillation, wherein there is introduced into the distillation column, above the feed point of the crude, liquid vinyl acetate, 0.1 to 5% by weight of water, based on the crude, liquid vinyl acetate feed, and 0.1 to 60% by weight of acetic acid, based on the crude, liquid vinyl acetate feed.
    Type: Grant
    Filed: May 21, 1999
    Date of Patent: May 8, 2001
    Assignee: Celanese GmbH
    Inventors: Stefan Hess, Michael Mark, Melchior A. Meilchen, Johann Stamm, Thomas Vernaleken, Martin Wagner
  • Patent number: 6214173
    Abstract: Provided is a novel on-site system and method for providing ultra-high-purity nitric acid to a point of use. The system includes a source of nitric acid at a concentration greater than 68 wt %; a reflux distillation column having an inlet in communication with the nitric acid source for introducing nitric acid into the column, a reboiler, and a condensate outlet to provide a flow of nitric acid condensate from the column; a reservoir in communication with the condensate outlet for receiving the flow of nitric acid condensate; and piping for delivering nitric acid from the reservoir to a point of use. The system and method can be used as an on-site subsystem, in a semiconductor device fabrication facility for supplying the nitric acid condensate to points of use in the semiconductor device fabrication facility.
    Type: Grant
    Filed: December 5, 1996
    Date of Patent: April 10, 2001
    Assignee: Air Liquide Electronics Chemicals & Services, Inc.
    Inventors: Mindi Xu, Wallace I. Yuan, Tracey Jacksier, Hwa-Chi Wang, Joe G. Hoffman, R. Scot Clark
  • Patent number: 6193849
    Abstract: A fractionator has a fractionation vessel, a reactor effluent vapors inlet, a vapor feed contacting zone, a baffled contacting section above the vapor feed contacting zone, a tops section above the baffled contacting section, a heavy bottoms liquid hold-up pool section below the vapor feed contacting zone, a bottoms outlet, a bottoms recycle system with a heat exchanger. Recycled, cooled bottoms is fed back to the fractionation vessel at the heavy bottoms liquid hold-up pool section and above the vapor feed contacting zone. The improvements involve providing a separation tray and downpipe for separating cooler bottoms liquid from hotter product vapors within the fractionation vessel: to avoid condensation and absorption of product vapors by the liquid pool; to have more rapid and uniform quenching of hot liquid entering the pool; and substantially reduce costly onstream maintenance to clean fouled bottoms recycle exchangers.
    Type: Grant
    Filed: April 21, 1995
    Date of Patent: February 27, 2001
    Inventor: William Lockett, Jr.
  • Patent number: 6100427
    Abstract: A process for producing an amide and/or acid from a nitrile comprises introducing a nitrile, as a first reactant, and a hydration compound, as a second reactant which is capable of reacting with the nitrile to convert it to its corresponding amide thus hydrating the nitrile and/or to convert it to its corresponding acid, into a treatment zone. The nitrile is subjected to catalytic distillation in the treatment zone in the presence of the hydration compound, to hydrate at least some of the nitrile to the corresponding amide and/or to form its corresponding acid. The amide and/or acid is withdrawn from the treatment zone.
    Type: Grant
    Filed: October 30, 1998
    Date of Patent: August 8, 2000
    Assignee: Catalytic Distillation Technologies
    Inventors: Barend Christiaan Buurman Bezuidenhout, Zamile Denga, Rian Steyn, Petrus Johannes Steynberg, Nicolaus Ladislaus Stark
  • Patent number: 6086723
    Abstract: A process for deodorizing and subsequently cooling dispersions or liquids comprisinga) passing steam through the dispersion or liquid to be cooled and held in a vessel (1), said dispersion or liquid being caused to foam up as a result,b) discharging the foam from the top section of the vessel via a nozzle (5) into an evacuated separation vessel (4), the foam being broken in the process,c) condensing the water vapor formed from the foam in a heat exchanger (8) and removing volatile organic components at the same time, andd) returning the broken foam to the vessel (1),in which the steps a) to d) are performed until the dispersion or liquid has been deodorized to the desired extent, wherein, after completion of the deodorization (in accordance with steps a) to d)), the hot dispersion or liquid is discharged from the bottom section of the vessel (1) through the nozzle (5) into the evacuated separation vessel (4), so that the dispersion or the liquid is cooled, the nozzle (5) and the evacuated separation vessel (4
    Type: Grant
    Filed: August 17, 1998
    Date of Patent: July 11, 2000
    Assignee: BASF Aktiengesellschaft
    Inventors: Wolfgang Hubinger, Rainer Wunder, Gerhard Bauer, Johannes Dobbelaar, Sven Lawrenz, Franz-Josef Mueseler, Jurgen Nahstoll, Robert Rupaner, Christian-Ulrich Schmidt