And Returning Distillation Product To A Previous Distillation Zone Patents (Class 203/84)
  • Patent number: 9687755
    Abstract: An extraction tower includes a housing defining a light phase outlet at a top thereof, a heavy phase inlet at an upper portion thereof, a light phase inlet at a lower portion thereof and a heavy phase outlet at a bottom thereof; a heavy phase distributor disposed in the housing and communicated with the heavy phase inlet; a light phase distributor disposed in the housing and communicated with the light phase inlet; a packing layer disposed in the housing and located between the heavy phase distributor and the light phase distributor; and at least one layer of vertical plates disposed in at least one of the packing layers, each layer of the vertical plates comprising at least two vertical plates parallel or cross to each other, each vertical plate disposed in an axial direction.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: June 27, 2017
    Assignee: Beijing Zehua Chemical Engineering Co., Ltd.
    Inventors: Runxing Xie, Bin He, Hongping Tang, Weiyang Fei
  • Patent number: 9687808
    Abstract: A method and system for controlling a hydrocracker and fractionator reaction loop is disclosed. The method and system utilizes a sidedraw tray within the fractionator distillation zone upon which liquid is collected. This liquid is withdrawn as a sidedraw stream. The withdrawal of the liquid from the sidedraw tray is controlled based on the level of liquid on the sidedraw tray rather than at a set or determined flow rate. The sidedraw stream is separated into a first stream and a product stream. Unlike other processes where the flow rate of the product stream is set and the internal reflux flow rate varies, the method involves fixing the flow rate of the first stream that is returned to the distillation zone of the fractionators with the flow rate of the product stream being set so as to control the liquid level on the sidedraw tray.
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: June 27, 2017
    Assignee: SHELL OIL COMPANY
    Inventor: Robert James Redelmeier
  • Publication number: 20150101922
    Abstract: A system for molecular targeting and separating includes a microwave energy source; a vapor source; a column configured and positioned to receive microwave energy from the microwave energy source and vapor from the vapor source; and a condenser, the condenser in communication with the column, the condenser configured to condense the vapor after the vapor receives the microwave energy.
    Type: Application
    Filed: December 16, 2014
    Publication date: April 16, 2015
    Inventor: Donald W. Ramer
  • Patent number: 8864951
    Abstract: Systems and processes for improving quality and yield of one or more distillate products generated in a distillation column are disclosed. The system comprises a feed inlet distributor that reduces the amount of liquid entrained in vapor rising from the feed zone of the distillation column, a wash zone collection apparatus having an improved design for collecting slop wax falling from a liquid/vapor contacting structure provided in the wash zone, a recirculation subsystem for recirculating at least a portion of the collected slop wax to the top of the wash zone for distribution as wash oil, and a control subsystem. The feed inlet distributor ensures a horizontal fluid flow path free of transverse surfaces thereby minimizing atomization of liquid droplets entrained in vapor in the feed stream.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: October 21, 2014
    Assignee: ThioSolv, LLC
    Inventors: Mark C. Anderson, George R. Winter
  • Patent number: 8628643
    Abstract: A fermentation liquid feed including water and a product alcohol and optionally CO2 is at least partially vaporized such that a vapor stream is produced. The vapor stream is contacted with an absorption liquid under suitable conditions wherein an amount of the product alcohol is absorbed. The portion of the vapor stream that is absorbed can include an amount of each of the water, the product alcohol and optionally the CO2. The temperature at the onset of the absorption of the vapor stream into the absorption liquid can be greater than the temperature at the onset of condensation of the vapor stream in the absence of the absorption liquid. The product alcohol can be separated from the absorption liquid whereby the absorption liquid is regenerated. The absorption liquid can include a water soluble organic molecule such as an amine.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: January 14, 2014
    Assignee: Butamax Advanced Biofuels LLC
    Inventors: Michael Charles Grady, William D. Parten, Robert W. Sylvester, Joseph J. Zaher
  • Patent number: 8609922
    Abstract: An aromatics complex producing one or more xylene isomers offers a large number of opportunities to conserve energy by heat exchange within the complex. One previously unrecognized opportunity is through providing two parallel distillation columns operating at different pressures to separate C8 aromatics from C9+ aromatics. The parallel columns offer additional opportunities to conserve energy within the complex through heat exchange in associated xylene recovery facilities.
    Type: Grant
    Filed: August 25, 2010
    Date of Patent: December 17, 2013
    Assignee: UOP LLC
    Inventors: Gregory R. Werba, Xin X. Zhu, Phillip F. Daly, Saadet Ulas Acikgoz, Jason T. Corradi, David W. Ablin
  • Patent number: 8545681
    Abstract: Disclosed is a process for improving the efficiency of a combined-cycle power generation plant and desalination unit. The process includes supplying exhaust gases from a gas turbine set used to generate electrical power to a heat recovery steam generator (HRSG) and then directing the steam from the HRSG to a steam turbine set. Salinous water is supplied into an effect of the desalination unit. Steam exhausted from the steam turbine set is utilized in the effect of the desalination unit to produce a distillate vapor and brine from the effect by heat exchange. Additionally, steam is introduced steam from at least one additional heat source from the combined-cycle power generation plant to the effect to increase the mass flow rate of steam into the effect. In one embodiment, the additional heat source is an intercooler heat exchanger. Heated water from the intercooler heat exchanger is provided to a reduced atmosphere flash tank, and the steam flashed in the flash tank is provided to the effect.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: October 1, 2013
    Assignee: General Electric Company
    Inventors: Andrew Philip Shapiro, Nishith Vora, Ching-Jen Tang, AliciA Jillian Jackson Hardy, Douglas Westerkamp
  • Patent number: 8524047
    Abstract: A method of dehydrating tolylenediamine which includes subjecting tolylenediamine having a water content of 5-40 wt. % to first-stage distillation at a vacuum of 13-101.3 kPa and subjecting the bottoms from the first-stage distillation to second-stage distillation at a vacuum lower than 13kPa.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: September 3, 2013
    Assignee: Mitsui Chemicals Inc.
    Inventors: Toshiyuki Ogawa, Mitsunaga Dohzaki, Masaaki Sasaki
  • Patent number: 8283509
    Abstract: The invention comprises an absorption heat pump to supply energy to a distillation process or an outside process. The streams used to effect the absorption heat pump are to be combined in any case as a feedstream to a conversion process, and energy thus is conserved by avoiding the necessity of reseparating the streams.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: October 9, 2012
    Assignee: UOP LLC
    Inventors: Paul A. Sechrist, Stanley J. Frey
  • Patent number: 8092656
    Abstract: A process for treatment of an aqueous stream to produce a low solute containing distillate stream and a high solute/solids containing blowdown stream utilizing a method to increase the efficiency of an evaporator while providing an essentially scale free environment for the heat transfer surface. Multi-valent ions and non-hydroxide alkalinity are removed from aqueous feed streams to very low levels and then the pH is increased preferably to about 9 or higher to increase the ionization of low ionizable constituents in the aqueous solution. In this manner, species such as silica and boron become highly ionized, and their solubility in the concentrated solution that is present in the evaporation equipment is significantly increased. The result of this is high allowable concentration factors and a corresponding increase in the recovery of high quality reusable water with essentially no scaling.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: January 10, 2012
    Assignee: Aquatech International Corporation
    Inventors: Keith R. Minnich, Ramkumar Karlupudi, Richard M. Schoen
  • Patent number: 8083903
    Abstract: An azeotropic distillation method, comprising a reaction step, a distillation step for separating and refining a reaction product, and a recovery step for collecting a reactant after the distillation step; wherein at least one component constituting the reactant in the reaction step can act as an entrainer for the azeotropic distillation in the distillation step; and a portion of the reactant capable of acting as the entrainer is supplied to the distillation step.
    Type: Grant
    Filed: February 1, 2007
    Date of Patent: December 27, 2011
    Assignee: Showa Denko K.K.
    Inventors: Hiroshi Maruta, Chihiro Otogawa
  • Patent number: 8075742
    Abstract: An apparatus and process for the separation of refrigerant mixtures is provided. The apparatus includes a first distillation column, a first condenser, and a first collection vessel. The apparatus also includes a sorter vessel that includes a sorter agent, wherein the sorter vessel is fluidly connected to the first distillation column.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: December 13, 2011
    Assignee: Midwest Refrigerants, LLC
    Inventor: Gregorio Tarancon, III
  • Publication number: 20110297528
    Abstract: The invention disclosed is an apparatus and method for the recovery of acetic acid, azeotropic agent, extraction agent, re-usable water and other reaction products such as p-toluic acid, from an aqueous stream generated during a terephthalic acid production process, having superior energy efficiency and reduced water consumption.
    Type: Application
    Filed: June 7, 2010
    Publication date: December 8, 2011
    Inventors: Ji-Young Jang, Kuang-Yeu Wu, Ming-Mou Yang
  • Publication number: 20110226607
    Abstract: Systems and processes for improving quality and yield of one or more distillate products generated in a distillation column are disclosed. The system comprises a feed inlet distributor that reduces the amount of liquid entrained in vapor rising from the feed zone of the distillation column, a wash zone collection apparatus having an improved design for collecting slop wax falling from a liquid/vapor contacting structure provided in the wash zone, a recirculation subsystem for recirculating at least a portion of the collected slop wax to the top of the wash zone for distribution as wash oil, and a control subsystem. The feed inlet distributor ensures a horizontal fluid flow path free of transverse surfaces thereby minimizing atomization of liquid droplets entrained in vapor in the feed stream.
    Type: Application
    Filed: March 17, 2011
    Publication date: September 22, 2011
    Applicant: THIOSOLV, LLC
    Inventors: Mark C. Anderson, George R. Winter
  • Patent number: 7828939
    Abstract: A method for concentrating effectively the heavy nitrogen isotope 15N to 50 atom % or more in which 14N15N and/or 15N2, which are molecules containing a heavy nitrogen isotope of 15N, are concentrated by distilling successively nitrogen N2 using plural distillation columns T1 to T4 each of which includes at least one condenser C1 to C4 and at least one reboiler R1 to R4 and is arranged in series, and a part of nitrogen in the distillation is drawn out to be subjected to isotope scrambling in an isotope scrambler S1, and nitrogen after the isotope scrambling is returned to the distillation to produce nitrogen N2 with a 15N concentration of 50 atom % or more.
    Type: Grant
    Filed: March 12, 2007
    Date of Patent: November 9, 2010
    Assignee: Taiyo Nippon Sanso Corporation
    Inventors: Hitoshi Kihara, Takashi Kambe, Shigeru Hayashida
  • Publication number: 20100168347
    Abstract: A method for the separation of hydrocarbon compounds utilizing a dividing wall distillation column is described. The dividing wall distillation column enables one or more side draw stream to be removed from the dividing wall distillation column in addition to an overhead stream and a bottoms stream.
    Type: Application
    Filed: December 31, 2008
    Publication date: July 1, 2010
    Applicant: Fina Technology, Inc.
    Inventor: James R. Butler
  • Patent number: 7699961
    Abstract: A water-soluble organic material condensation apparatus equipped with a distillation column for distilling an aqueous solution of a water-soluble organic material, wherein a vapor generated at the top of the distillation column or a condensed liquid from the vapor is introduced to a device other than the distillation column which has the function to separate water from the water-soluble organic material to thereby condense the water-soluble organic material through separating water and then the condensed water-soluble organic material is recycled to the distillation column. The device other than the distillation column is desirably a separating film such as a zeolite film. The apparatus is improved in the operation of the upper portion of the condensation section of the distillation column and allows energy savings during distillation.
    Type: Grant
    Filed: October 19, 2001
    Date of Patent: April 20, 2010
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Shiro Ikeda, Takashi Nakane
  • Publication number: 20090071814
    Abstract: The object of the present invention is to provide a method for concentrating effectively the heavy nitrogen isotope 15N to 50 atom % or more. In order to achieve the object, the present invention provides a method for concentrating a heavy nitrogen isotope 15N, in which 14N15N and/or 15N2, which are molecules containing a heavy nitrogen isotope of 15N, are concentrated by distilling successively nitrogen N2 using plural distillation columns T1 to T4 each of which comprises at least one condenser C1 to C4 and at least one reboiler R1 to R4 and is arranged in series, and a part of nitrogen in the distillation is drawn out to be subjected to isotope scrambling in an isotope scrambler S1, and nitrogen after the isotope scrambling is returned to the distillation to produce nitrogen N2 with a 15N concentration of 50 atom % or more.
    Type: Application
    Filed: March 12, 2007
    Publication date: March 19, 2009
    Inventors: Hitoshi Kihara, Takashi Kambe, Shigeru Hayashida
  • Publication number: 20080128264
    Abstract: A novel method for connecting multiple existing columns which are retrofitted into vapor-liquid contacting devices with trays or packings suitable for the operation of a three-phase (vapor-liquid-liquid) extractive distillation column for aromatics recovery. The retrofitted columns are connected by a vapor transfer line to transfer the vapor phase from the top of the lower column to the bottom of the upper column, and by a liquid transfer line to transfer the liquid phase from the bottom of the upper column to the top of the lower column of the three-phase extractive distillation column.
    Type: Application
    Filed: August 8, 2007
    Publication date: June 5, 2008
    Inventors: KUANG YEU WU, ADAM T. LEE, TZONG-BIN LIN, HUNG-CHUNG SHEN
  • Patent number: 7311813
    Abstract: This invention is an improved distillation sequence for the separation and purification of ethylene from a cracked gas. A hydrocarbon feed enters a C2 distributor column. The top of the C2 distributor column is thermally coupled to an ethylene distributor column, and the bottoms liquid of a C2 distributor column feeds a deethanizer column. The C2 distributor column utilizes a conventional reboiler. The top of the ethylene distributor is thermally coupled with a demethanizer column, and the bottoms liquid of the ethylene distributor feeds a C2 splitter column. The ethylene distributor column utilizes a conventional reboiler. The deethanizer and C2 splitter columns are also thermally coupled and operated at a substantially lower pressure than the C2 distributor column, the ethylene distributor column, and the demethanizer column. Alternatively, a hydrocarbon feed enters a deethanizer column.
    Type: Grant
    Filed: March 20, 2003
    Date of Patent: December 25, 2007
    Assignee: Ineos USA LLC
    Inventors: Rian Reyneke, Michael Foral, Christos G. Papadopoulos, Jeffrey S. Logsdon, Wayne W. Y. Eng, Guang-Chung Lee, Ian Sinclair
  • Patent number: 7183448
    Abstract: A mixture comprising at least 1,1,1,3,3-pentafluoropropane and 1,1,1-trifluoro-3-chloro-2-propene is subjected to a distillation operation, and thereby, a distillate comprising an azeotropic composition consisting substantially of 1,1,1,3,3-pentafluoropropane and 1,1,1-trifluoro-3-chloro-2-propene is obtained and a bottom product comprising 1,1,1,3,3-pentafluoropropane or 1,1,1-trifluoro-3-chloro-2-propene which each is separated and purified.
    Type: Grant
    Filed: November 10, 1999
    Date of Patent: February 27, 2007
    Assignee: Daikin Industries, Ltd.
    Inventors: Tatsuo Nakada, Masayoshi Imoto, Takashi Shibanuma
  • Patent number: 6926810
    Abstract: Disclosed herein are methods for the recovery of an organic acid, such as a heat stable lactic acid, from a feed stream which contains at least one of an organic acid amide, an organic acid ammonium salt, or an alkylamine-organic acid complex. The feed stream is mixed with at least one azeotroping agent. The azeotroping agent is a hydrocarbon capable of forming at least one azeotrope with the organic acid that is produced by the thermal decomposition of the amide, ammonium salt, or complex in the feed stream. Preferably the azeotrope is a heteroazeotrope. The mixture of the feed stream and the azeotroping agent is heated to produce a vapor stream. The azeotrope is a component of the vapor stream. The vapor stream can be condensed to a liquid stream, and the organic acid is recovered in the liquid stream that is produced. When the azeotrope is a heteroazeotrope, the vapor stream can be condensed into a liquid stream, which can be separated into a first phase and a second phase.
    Type: Grant
    Filed: March 15, 2001
    Date of Patent: August 9, 2005
    Assignee: A. E. Staley Manufacturing Co.
    Inventors: Michael Charles Milner Cockrem, Istvan Kovacs
  • Patent number: 6793777
    Abstract: The invention relates to a method for separating and purifying an aqueous mixture that mainly consists of acetic acid, formic acid and high-boiling substances by extraction with a solvent in a cyclic process. The inventive method is characterized in that the flow of raffinate is fed to a solvent stripping column (11) with the major part of the water in order to remove the water from the cycle. The flow of extract is fed to a solvent recovery distillation column (8). In a first step, a mixture (A) that consists of water and solvent, is separated by overhead distillation. A mixture (B) that consists of acetic acid, formic acid and high-boiling substances is separated via a sump. Once the formic acid is removed in a column (29), mixture (B) is separated in an acetic acid distillation column to give pure acetic acid and high-boiling substances.
    Type: Grant
    Filed: December 5, 2001
    Date of Patent: September 21, 2004
    Assignee: Consortium für Elektrochemische Industrie GmbH
    Inventors: Christoph Rüdinger, Harald Herbert Voit, Michael Hallmann, Mehmet Günaltay, Barbara Reil, Hans-Jürgen Eberle
  • Patent number: 6579419
    Abstract: For the purification of the norbornene obtained by the reaction of dicyclopentadiene or cyclopentadiene and ethylene, the crude reaction mixture containing light impurities having boiling temperatures lower than that of norbornene; medium-heavy impurities having the boiling temperatures between that of norbornene and that of ethylnorbornene; and heavy impurities containing ethylnorbornene and compounds boiling higher than ethylnorbornene, boiling temperatures greater than that ethylnorbornene, a first distillation of the crude reaction mixture is carried out in a tailing column (C1), removing a portion of the heavy impurities and a portion of the medium-heavy impurities; then a second distillation of the crude mixture, thus tailed, is carried out in a topping column (C2), removing the light impurities; and a third distillation of the mixture, thus topped, is subsequently carried out in a tailing column (C3), removing the remainder of the heavy and medium-heavy impurities.
    Type: Grant
    Filed: July 7, 2000
    Date of Patent: June 17, 2003
    Assignee: Elf Atochem, S.A.
    Inventors: Roland Kotwica, André Marbach
  • Patent number: 6413378
    Abstract: An extractive distillation tower 4 supplied with a feedstock containing butadiene and a solvent and for distilling the feedstock to separate and purify the butadiene.
    Type: Grant
    Filed: October 5, 2000
    Date of Patent: July 2, 2002
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Masanobu Kanauchi, Yasuhiko Arimori, Toshihiro Nakano
  • Patent number: 6414205
    Abstract: A process for the selective hydrogenation of the methyl acetylene and propadiene (MAPD) in a propylene rich stream is disclosed wherein the selective hydrogenation is carried out stepwise (a) first in a single pass fixed bed reactor and then (b) in a distillation column reactor containing a supported PdO hydrogenation catalyst which serves as a component of a distillation structure. Conversion and selectivity to propylene in improved over the use of the single pass fixed bed reactor alone.
    Type: Grant
    Filed: March 24, 2000
    Date of Patent: July 2, 2002
    Assignee: Catalytic Distillation Technologies
    Inventors: Stephen J. Stanley, Gary R. Gildert
  • Patent number: 6336997
    Abstract: A heat-deteriorative compound contained in a liquid mixture is refined by a distillation procedure using a distillation column in which a vapor fraction and a liquid fraction containing the heat-deteriorative compound are generated from the liquid mixture, and a liquid film-falling reboiler in which the liquid fraction falls in the form of liquid films along inner surfaces of a plurality of vertical heat-conductive pipes at a Reynolds number (Re) of 700 to 10,000 and heated to a temperature lower than the heat-deterioration temperature of the heat deteriorative compound to such an extent that 1 to 15% by weight of the liquid fraction is evaporated per pass through the reboiler, the heated liquid fraction being returned into the distillation column to generate the vapor fraction from the liquid mixture fed into the distillation column.
    Type: Grant
    Filed: February 1, 1999
    Date of Patent: January 8, 2002
    Assignee: Ube Industries, Ltd.
    Inventors: Yukio Inaba, Kazunori Fujita, Hiroshi Kofuji
  • Patent number: 6120654
    Abstract: Processes for the purification and color stabilization of crude maleic anhydride by distillation in a batch or continuous distillation column.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: September 19, 2000
    Assignee: Huntsman Petrochemical Corporation
    Inventors: Henry C. Brown, William H. Alumbaugh, Joseph C. Burnett
  • Patent number: 6015875
    Abstract: Acetals are produced from the reaction of aldehydes and alcohols, e.g. methylal by the reaction of methanol and formaldehyde, by the reaction in a reaction distillation column of the alcohol and aldehyde in the presence of a catalyst and the concurrent fractional distillation of the reaction mixture to separate the reaction products, water and acetal.
    Type: Grant
    Filed: August 11, 1998
    Date of Patent: January 18, 2000
    Assignee: Catalytic Distillation Technologies
    Inventors: Lawrence A. Smith, Jr., Robert P. Arganbright
  • Patent number: 5993609
    Abstract: A process for the purification of recovered or regenerated phosphorus oxychloride contaminated by reactive organic compounds, by reacting the contaminated phosphorus oxychloride with from 0.1 to 5% by weight of an organic amine, having 1 or 2 tertiary N-atoms and a boiling point above the boiling point of phosphorus oxychloride, at the boiling temperature of the reaction mixture and subsequently carrying out fractional distillation at atmospheric pressure to obtain purified phosphorus oxychloride.
    Type: Grant
    Filed: September 2, 1998
    Date of Patent: November 30, 1999
    Assignee: DSM Fine Chemicals Austria GmbH
    Inventors: Karl Schwendinger, Engelbert Kloimstein
  • Patent number: 5804040
    Abstract: There is provided a purification process for dimethoxymethylsilane in which a mixture containing dimethoxymethylsilane and methanol is subjected to a first distillation step in which the mixture is distilled in the presence of methyl formate or methoxytrimethylsilane so that a distillate fraction containing methanol and methyl formate or methoxytrimethylsilane is distilled off and a balance fraction containing dimethoxymethylsilane and methanol is discharged, the amount of methanol in the balance fraction being substantially reduced relative to that of the mixture.
    Type: Grant
    Filed: September 6, 1996
    Date of Patent: September 8, 1998
    Assignee: Kaneka Corporation
    Inventors: Yousuke Asai, Nobuo Ogawa
  • Patent number: 5788818
    Abstract: A process for the purification of raw acetone deriving from processes for the production of phenol acetone, impurity mainly due to cumene, water, aldehydes and methanol, the steps of:feeding the stream of raw acetone coming from the primary fractionation of a plant for the production of phenol and acetone to a first distillation column to which a solution of sodium hydroxide at 2% is also fed;sending the stream at the head of the first column, containing of acetone, water and cumene to a second column to which the extractive solvent triethyleneglycol is also fed;recovering substantially anhydrous acetone from the head of the second column;feeding the bottom product of the second column, containing triethyleneglycol, water, cumene and acetone to a third distillation column in which an azeotropic mixture of water and cumene is recovered from the head and anhydrous triethyleneglycol from the bottom;sending the azeotropic mixture of water and cumene to a decanter in which a water phase is separated, containing ac
    Type: Grant
    Filed: September 16, 1996
    Date of Patent: August 4, 1998
    Assignee: Enichem S.p.A.
    Inventors: Lorenzo Lorenzoni, Salvatore Simula, Giuseppe Messina, Riccardo Mansani
  • Patent number: 5770021
    Abstract: A process including a first stage wherein a feed gas stream containing acrolein originating, for example from the gas-phase oxidation of propylene to acrolein, is fractionated into a gaseous effluent and a liquid stream in a cooling column operating such that the temperature of the liquid stream at the bottom of the column is lower than or equal to the condensation temperature of the feed gas stream, the difference in temperature not exceeding 20.degree. C. and, a second stage, wherein the gaseous effluent is condensed at a temperature that is lower than 20.degree. C., to give a liquid fraction and a purified gaseous fraction, is disclosed. An apparatus for carrying on the purification process is also disclosed.
    Type: Grant
    Filed: July 1, 1996
    Date of Patent: June 23, 1998
    Assignee: Rhone-Poulenc Nutrition Animale
    Inventors: Michel Hego, Frederic Kress
  • Patent number: 5723026
    Abstract: The production of high purity benzene and high purity toluene is obtained by utilizing the initial gas separating column for the treatment of the aromatic containing starting material as a separating column for separating a benzene rich from a toluene rich component. The benzene rich component is subject directly to distillation while the toluene is subject to predistillation to separate high boiling components and only then to extractive distillation is distilled to separate the high purity benzene from the high purity toluene.
    Type: Grant
    Filed: August 18, 1995
    Date of Patent: March 3, 1998
    Assignee: Krupp Koppers GmbH
    Inventors: Martin Leisse, Hans-Jurgen Vollmer, Uwe Ranke
  • Patent number: 5675054
    Abstract: The invention is a process for reducing capital and energy costs in ethylene recovery. Moderate pressure processing and thermally coupled fractionation steps are achieved through the use of integrator columns. Ethylene separation from cracked gas originating from ethane through gas oil feeds can now be done with thermodynamically efficient fractionation at capital cost competitive with low efficiency designs. Acetylene hydrogenation may be done before demethanization where desired, and dephlegmation is preferred to accomplish high-efficiency rectification of hydrogen and methane from ethylene. Open loop heat pumps can optionally be incorporated into the ethane/ethylene splitter fractionation step, whose desirability is controlled by optimization of capital and energy costs.
    Type: Grant
    Filed: July 17, 1995
    Date of Patent: October 7, 1997
    Inventors: David Manley, Hazem Haddad
  • Patent number: 5620568
    Abstract: An extractive distillation agent of 1-propanol is fed to an extractive distillation column used for the distillation of propylene oxide contaminated with water, acetone and methanol to obtain an overhead distillate fraction of essentially anhydrous propylene oxide contaminated with reduced quantities of acetone and methanol, and a heavier bottoms distillation fraction containing substantially all of the 1-propanol, water and acetone, some of the methanol and heavier by-products of propylene oxide formed in the distillation column.
    Type: Grant
    Filed: June 3, 1996
    Date of Patent: April 15, 1997
    Assignee: Texaco Chemical, Inc.
    Inventors: William A. Smith, Mark A. Mueller
  • Patent number: 5500097
    Abstract: The present invention provides a method for removing an organic compound in water at a high efficiency by separating an organic compound, particularly such an organic chlorine compound as 1,2-dichloroethane, carbon tetrachloride and chloroform dissolved in water or forming two liquid phases with water from a water phase, by the steps of:(i) charging water containing an organic compound into a first distillation column for conducting distillation or steam distillation to take the organic compound and water out of the top of the first distillation column and to obtain a bottom liquor containing the organic compound at a lower content from the bottom of the first distillation column, and(ii) charging the bottom liquor of the first distillation column into a second distillation column operated at a pressure lower than that in the first distillation column for conducting distillation, preferably flashing under reduced pressure, to take a gas distillate containing a large amount of the organic compound out of the t
    Type: Grant
    Filed: December 28, 1994
    Date of Patent: March 19, 1996
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Shinji Yamamoto, Kazutoshi Itoyama, Seiichi Fujimaki
  • Patent number: 5500098
    Abstract: Volatile acids containing metal salt impurities, such as metal pickling solutions-are regenerated by a process in which the acid is subjected to sulfuric acid distillation. Resulting volatile acid vapor is condensed and recycled to the pickle tank, while the residual acid mixture is treated in an acid sorption unit, preferably of the acid retardation type. Acid sorbed in the acid sorption unit is periodically eluted with water and recycled, while metal impurities are rejected in a deacidified by-product solution.
    Type: Grant
    Filed: August 5, 1993
    Date of Patent: March 19, 1996
    Assignee: Eco-Tec Limited
    Inventors: Craig J. Brown, Michael A. Sheedy
  • Patent number: 5399244
    Abstract: Benzene and other aromatics are separated from a stream of mixed hydrocarbons containing both aromatics and non-aromatics by extractive distillation with a solvent system containing dimethyl sulfoxide and optionally a co-solvent, preferably water, followed by distillation stripping of the aromatics from the enriched solvent system, and recycle of the lean solvent system to the extractive distillation step.
    Type: Grant
    Filed: December 6, 1993
    Date of Patent: March 21, 1995
    Assignee: Glitsch, Inc.
    Inventors: Joseph C. Gentry, Lloyd Berg, John C. McIntyre, Randa W. Wytcherley
  • Patent number: 5264117
    Abstract: Where side stream distillate strippers are used in the distillation of hydrocarbons, the required size of the distillation column and the amount of stripping gas or vapor required are reduced by passing components stripped from the distillates through a plurality of strippers in series, rather than directly back to the distillation zone.
    Type: Grant
    Filed: April 24, 1991
    Date of Patent: November 23, 1993
    Assignee: Sun Refining and Marketing Company
    Inventor: Gail M. DeLong
  • Patent number: 5252187
    Abstract: A method of recovering a solvent from a mother liquor in a system in which the mother liquor also contains non-volatile matter, volatile solute and volatile solvent, and the solute concentration is low, in which a heat pump distilling column (first column) is so operated as to work only as a concentrating section of a distilling column by feeding a mother liquor to the column bottom of the heat pump distilling column, contact of non-volatile matter with the concentrating section is prevented and the column bottom liquor is sent to an evaporator so as to separate the non-volatile matter by the evaporator, thereafter, a vapor from the evaporator is fed to a distilling column (second column), and distillates of first and second columns and bottoms of the second column are withdrawn as the products. The procedures described above are carried out under specific operation conditions.
    Type: Grant
    Filed: July 22, 1992
    Date of Patent: October 12, 1993
    Assignee: Toyo Engineering Corporation
    Inventors: Jun Ohtsu, Kanji Abe, Toshifumi Ida
  • Patent number: 5240568
    Abstract: A process for separating phenol obtained by the decomposition of cumene hydroperoxide from high boiling impurities, includes the following steps:a) feeding phenol rectification bottoms comprising phenol, acetophenone, cumylphenol, alpha-methylstyrene dimers and high boiler residues to a first phenol freeing distillation column A;b) feeding concentrated bottoms with substantially reduced phenol content from column A to a second residue concentration distillation column B;c) withdrawing a stream rich in compounds boiling between phenol and residue, particularly cumylphenol, from said column B from a point below the feed and returning at least a portion of said stream to said column A at a point above the feed;d) recovering overheads from column A comprising at least 95 weight percent phenol; ande) recovering acetophenone-rich overheads from column B comprising at least 70 weight percent acetophenone.
    Type: Grant
    Filed: August 29, 1991
    Date of Patent: August 31, 1993
    Assignee: Allied-Signal Inc.
    Inventors: Chong H. Chan, Lamberto Crescentini, Everett H. Hinton, Jr., Laszlo J. Balint, deceased
  • Patent number: 5238540
    Abstract: The method of obtaining a pure aromatic hydrocarbon from a hydrocarbon starting mixture includes extractively distilling the hydrocarbon starting mixture with a selective solvent; feeding the sump product of the extractive distillation through a first and second auxiliary boilers connected in series to form a cooled sump product at a temperature from 105.degree. to 120.degree. C.
    Type: Grant
    Filed: September 26, 1991
    Date of Patent: August 24, 1993
    Assignee: Krupp Koppers GmbH
    Inventors: Luzian Skatulla, Hans-Christoph Schneider, Hans-Jurgen Vollmer
  • Patent number: 5234553
    Abstract: Process for obtaining a pure hydrocarbon from a starting material containing the hydrocarbon including performing an extractive distillation of the starting material containing the hydrocarbon in an extractive distillation column using a solvent comprising an N-substituted morpholine having substituents with no more than seven carbon atoms; feeding the sump product of the extractive distillation column into a distillation separator column at an entry point in a center portion of the distillation separator column; distilling off the hydrocarbon from the top of the distillation separator column but advantageously returning a minor portion of it as a reflux; drawing off solvent from the sump of the distillation separator column; feeding the solvent drawn off from the sump of the distillation separator column into an evaporator to form a vapor in the evaporator at the pressure, p.sub.2, the pressure p.sub.2 in the evaporator being lower than the pressure p.sub.
    Type: Grant
    Filed: July 22, 1992
    Date of Patent: August 10, 1993
    Assignee: Krupp Koppers GmbH
    Inventors: Martin Kaiping, Udo Klaumunzner, Hans-Christoph Schneider, Hans-Jurgen Vollmer
  • Patent number: 5217582
    Abstract: A process is provided for separating high purity alkyl glycolate from a gaseous reaction mixture resulting from the catalyzed gas phase oxidation of alkyl glycolate. A hot solvent which is immiscible with water but selectively dissolves alkyl glycolate and alkyl glyoxylate is brought in contact with the gaseous reaction mixture, and water and alcohol vapors are removed from the hot solvent. The alkyl glyoxylate is removed from the solution by a first distillation and the alkyl glycolate and solvent are then separated in a second distillation.
    Type: Grant
    Filed: February 7, 1992
    Date of Patent: June 8, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: George E. Heinsohn, John F. Kook, John R. Kosak, Rudolf E. Svadlenak
  • Patent number: 5202521
    Abstract: A selective absorption process for separating C.sub.2 -C.sub.4 alkenes (in particular ethylene) from C.sub.1 -C.sub.5 alkanes with a liquid extractant comprising dissolved copper(I) compound(s), in particular dissolved Cu(I) hydrocarbonsulfonate(s), is carried out in a one-column operation, wherein an overhead product is withdrawn which contains alkene(s) at a lower concentration than the feed, a side product is withdrawn which contains alkene(s) at a higher concentration than the feed, and a bottoms stream is withdrawn which contains primarily the liquid extractant.
    Type: Grant
    Filed: June 5, 1992
    Date of Patent: April 13, 1993
    Assignee: Phillips Petroleum Company
    Inventors: Ronald E. Brown, Robert L. Hair
  • Patent number: 5180474
    Abstract: A method of separation of aromates from hydrocarbon mixtures by extractive distillation with a selective solvent, includes introducing a hydrocarbon mixture into the extractive distillation column, distillating out non-aromate components of the introduced hydrocarbon mixture from a head of the extractive distillation column, withdrawing aromates together with a used solvent from a sump of the extractive distillation column and supplying to a driving-out column, separating the aromates from the solvent in the driving-out column, withdrawing the aromates as a head product and the solvent as a sump product from the driving-out column, reintroducing the withdrawn solvent into the extractive distillation column, the withdrawing of the solvent from the driving-out column including withdrawing only part of the solvent with a high temperature required for the complete aromate driving-out from the sump of the driving-out column, while a rest of the solvent with a certain aromate content and a lower temperature is with
    Type: Grant
    Filed: January 27, 1992
    Date of Patent: January 19, 1993
    Assignee: Krupp Koppers GmbH
    Inventors: Luzian Skatulla, Hans-Jurgen Vollmer, Hans-Christoph Schneider
  • Patent number: 5168983
    Abstract: A process for separating cyclohexanol and other impurities from a mixture containing cyclohexanone and cyclohexanol is disclosed.
    Type: Grant
    Filed: March 22, 1991
    Date of Patent: December 8, 1992
    Assignee: Mitsubishi Kasei Corporation
    Inventors: Kazuo Tan, Kazuhiro Fujii, Michio Nakamura, Kazunao Hanada
  • Patent number: 5160587
    Abstract: An extractive distillation agent consisting essentially of dipropylene glycol is fed to an extractive distillation column used for the distillation of propylene oxide contaminated with water, acetone and methanol to obtain an overhead distillate fraction consisting of essentially anhydrous propylene oxide contaminated with reduced quantities of acetone and methanol, and a heavier bottoms distillation fraction containing substantially all of the dipropylene glycol, water and acetone and some of the methanol introduced into the distillation column.
    Type: Grant
    Filed: November 1, 1991
    Date of Patent: November 3, 1992
    Assignee: Texaco Chemical Company
    Inventors: Edward T. Marquis, George P. Speranza, Yu-Hwa E. Sheu, William K. Culbreth, III, David G. Pottratz
  • Patent number: 5154803
    Abstract: An extractive distillation agent consisting essentially of 2-methyl-2,4-pentanediol is fed to an extractive distillation column used for the distillation of propylene oxide contaminated with water, acetone and methanol to obtain an overhead distillate fraction consisting of essentially anhydrous propylene oxide contaminated with reduced quantities of acetone and methanol, and a heavier bottoms distillation fraction containing substantially all of the 2-methyl-2,4-pentanediol, water and acetone and some of the methanol introduced into the distillation column.
    Type: Grant
    Filed: November 1, 1991
    Date of Patent: October 13, 1992
    Assignee: Texaco Chemical Company
    Inventors: Edward T. Marquis, George P. Speranza, Yu-Hwa E. Sheu, William K. Culbreth, III, David G. Pottratz