Organic Compound Patents (Class 203/57)
  • Patent number: 9205388
    Abstract: Herein disclosed is a method, comprising: forming a dispersion under high shear comprising gas bubbles of an oxidant dispersed in a liquid phase, wherein the bubbles have a mean diameter of less than 1.5 micron; and contacting the dispersion with an oxidation catalyst to produce a product stream, wherein the product stream comprises a substance selected from the group consisting of dicarboxylic acid, benzoic acid, 2-methylbenzoic acid, 3-methylbenzoic acid, 4-methylbenzoic acid, and phthalic anhydride. In some cases, forming the dispersion under high shear comprises introducing the oxidant and the liquid phase into a high shear device comprising at least one rotor and at least one complementarily-shaped stator. Herein also disclosed is a system for producing a substance selected from the group consisting of dicarboxylic acid, benzoic acid, 2-methylbenzoic acid, 3-methylbenzoic acid, 4-methylbenzoic acid, and phthalic anhydride.
    Type: Grant
    Filed: August 12, 2010
    Date of Patent: December 8, 2015
    Assignee: H R D Corporation
    Inventors: Abbas Hassan, Aziz Hassan, Rayford G. Anthony, Gregory G. Borsinger
  • Patent number: 9005405
    Abstract: Recovering high purity benzene from hydrocarbon feedstock containing aromatics and non-aromatics is implemented by simple and low-cost modifications to conventional extractive distillation columns (EDCs). Methyl cyclohexane (MCH) that is generated through non-selective hydrogenation of toluene in hydrodesulfurization (HDS) units is a major contaminant in benzene production. To meet MCH specifications, often times the extractive distillation (ED) process for recovering purified benzene is operated with excessive benzene loss to the overhead raffinate stream, producing a lower quality non-aromatic product.
    Type: Grant
    Filed: March 1, 2012
    Date of Patent: April 14, 2015
    Assignees: CPC Corporation, Taiwan, AMT International, Inc.
    Inventors: Kuang-Yeu Wu, Tzong-Bin Lin, Fu-Ming Lee, Tsung-Min Chiu, Jeng-Cheng Lee
  • Patent number: 8975456
    Abstract: The present invention provides a method for purifying HFO-1234yf, comprising the steps of (1) cooling a liquid mixture containing HFO-1234yf and HF to separate the mixture into a upper liquid phase having a high concentration of HF and a lower liquid phase having a high concentration of 2,3,3,3-tetrafluoropropene; and (2) subjecting the lower liquid phase obtained in step (1) to a distillation operation to withdraw a mixture containing HFO-1234yf and HF from a top of a distillation column, thereby obtaining substantially HF-free HFO-1234yf from a bottom of the distillation column. According to the present invention, HF and HFO-1234yf contained in a mixture containing HF and HFO-1234yf can be separated under simple and economically advantageous conditions.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: March 10, 2015
    Assignee: Daikin Industries, Ltd.
    Inventors: Takehiro Chaki, Kazuhiro Takahashi, Yoshinori Tanaka, Hitoshi Yoshimi
  • Patent number: 8968523
    Abstract: A process for recovering butanol from a mixture of a water-immiscible organic extractant, water, butanol, and optionally a non-condensable gas, is provided. The butanol is selected from 1-butanol, isobutanol, and mixtures thereof. An overhead stream from a first distillation column is decanted into two liquid phases. The wet butanol phase is refined in a second distillation column; the aqueous phase is returned to the first distillation column. A portion of the wet butanol phase from the decanter is also returned to the first distillation column. The extractant may be C7 to C22 fatty alcohols, C7 to C22 fatty acids, esters of C7 to C22 fatty acids, C7 to C22 fatty aldehydes, and mixtures thereof.
    Type: Grant
    Filed: July 13, 2010
    Date of Patent: March 3, 2015
    Assignee: Butamax Advanced Biofuels LLC
    Inventors: Yihui Tom Xu, William D. Parten
  • Patent number: 8968522
    Abstract: A process for recovering butanol from a mixture of a water-immiscible organic extractant, water, butanol, and optionally a noncondensable gas, is provided. The butanol is selected from 1-butanol, isobutanol, and mixtures thereof An overhead stream from a first distillation column is decanted into two liquid phases. The wet butanol phase is returned to the first distillation column as reflux. A bottom stream from the first distillation column is refined in a second distillation column to obtain a second overhead stream and a second bottoms stream. The extractant may be C7 to C22 fatty alcohols, C7 to C22 fatty acids, esters of C7 to C22 fatty acids, C7 to C22 fatty aldehydes, and mixtures thereof.
    Type: Grant
    Filed: July 13, 2010
    Date of Patent: March 3, 2015
    Assignee: Butamax Advanced Biofuels LLC
    Inventors: Yihui Tom Xu, William D. Parten
  • Publication number: 20140374235
    Abstract: Embodiments of the invention are directed toward a novel pressurized vapor cycle for distilling liquids. In an embodiment of the invention, a liquid purification system is revealed, including the elements of an input for receiving untreated liquid, a vaporizer coupled to the input for transforming the liquid to vapor, a head chamber for collecting the vapor, a vapor pump with an internal drive shaft and an eccentric rotor with a rotatable housing for compressing vapor, a condenser in communication with the vapor pump for transforming the compressed vapor into a distilled product, and an electric motor with motor rotor and magnets hermetically sealed within the fluid pressure boundary of the distillation system.
    Type: Application
    Filed: September 8, 2014
    Publication date: December 25, 2014
    Inventors: Jason A. Demers, Scott A. Leonard, Kingston Owens
  • Patent number: 8916031
    Abstract: Described is a process to obtain tetracosanol from a complex mixture derived from tall oil pitch that comprises terpenoids, rosin alcohols, rosin aldehydes, aliphatic alcohols, hydrocarbons and stilbene derivatives. The process comprises a mixture crystallization step from hexane and a fractional distillation of the crystallized solids, which yields tetracosanol with more than 90% purity.
    Type: Grant
    Filed: May 10, 2010
    Date of Patent: December 23, 2014
    Assignees: Pontificia Universidad Catolica de Valparaiso, Harting S.A.
    Inventors: Miguel Angel Fuenzalida Diaz, Alejandro Markovits Rojas, Miriam Berrios Cornejo, Mabel Keller Mena, Jose Rodrigo Vergara Salinas, Glenda Cea Barcia, Andres Illanes Frontaura, Rolando Arturo Chamy Maggi, Andres Markovits Schersl, Araceli Olivares Miralles
  • Patent number: 8900417
    Abstract: This invention provides a method for purifying HFO-1234yf by removing HF from a mixture of HFO-1234yf and HF under simple and economically advantageous conditions.
    Type: Grant
    Filed: July 21, 2011
    Date of Patent: December 2, 2014
    Assignee: Daikin Industries, Ltd.
    Inventors: Takehiro Chaki, Kazuhiro Takahashi
  • Patent number: 8771476
    Abstract: High temperatures and oxygen exposure during extractive distillation can result in polymerization of vinyl aromatic compounds. In various embodiments, the present disclosure relates to methods for inhibiting polymerization of vinyl aromatic compounds during extractive distillation. In various embodiments, the methods include a) providing a mixture containing at least one vinyl aromatic compound, b) adding at least one dinitrophenol inhibitor to the mixture, and c) after step b), performing an extractive distillation on the mixture to isolate the at least one vinyl aromatic compound. Purified styrene can be isolated by the methods described herein. In some embodiments, the dinitrophenol inhibitor is 2-sec-butyl-4,6-dinitrophenol (DNBP).
    Type: Grant
    Filed: February 15, 2010
    Date of Patent: July 8, 2014
    Assignee: GTC Technology LP
    Inventors: Amy Sealey, George A. Ball, B. Bryant Slimp, Jr.
  • Patent number: 8628644
    Abstract: The present invention relates to a process for separating close-boiling and azeotropic components of mixtures, wherein said mixtures contain at least one hydrofluorocarbon compound, using at least one ionic liquid.
    Type: Grant
    Filed: September 22, 2006
    Date of Patent: January 14, 2014
    Assignee: E I du Pont Nemours and Company
    Inventors: Mark B. Shiflett, Akimichi Yokozeki
  • Patent number: 8536397
    Abstract: A process for the separation of the aromatic compounds benzene, toluene and xylene from an aromatics-containing reformate gasoline and pyrolysis gasoline or a coke-oven light oil or an aromatics-containing refinery stream, in which the aromatics are separated by an extractive distillation uses a novel solvent combination made up of the compounds n,n?-diformyl piperazine or 2,2?-bis-(cyanoethyl)ether in a combination with n-formyl morpholine as a second solvent for extractive distillation so that the solvent combination obtained shows a higher selectivity with regard to the aromatics to be extracted so that a lower solvent load is required. The aromatics-containing feed mixture is first submitted to a pre-distillation so that the obtained fraction has a narrow boiling point range. This fraction is then submitted to an extractive distillation in a first column, in which an aromatics-lean head product of predominantly paraffinic hydrocarbons is obtained as well as an aromatics-enriched bottom product.
    Type: Grant
    Filed: August 5, 2008
    Date of Patent: September 17, 2013
    Assignee: UHDE GmbH
    Inventors: Oliver Noll, Helmut Gehrke, Christian Luebbecke, Baerbel Kolbe
  • Patent number: 8500961
    Abstract: Method of distilling mixtures comprising salts having a melting point of less than 200° C. at 1 bar (ionic liquids), wherein the mixtures additionally comprise an organic compound (called distillation aid below) which is not ionic has a molecular weight of less than 5000 has a boiling point which is at least 5° C. higher compared with the ionic mixtures included in the mixture.
    Type: Grant
    Filed: February 15, 2010
    Date of Patent: August 6, 2013
    Assignee: BASF SE
    Inventors: Guenter Forster, Vijay Narayanan Swaminathan
  • Patent number: 8475567
    Abstract: Process for separating propane and propylene using a distillation column and at least one membrane separation unit constituted by one or more modules operating in series, said membrane separation unit being placed either upstream, or downstream, or upstream and downstream of the distillation column.
    Type: Grant
    Filed: December 16, 2008
    Date of Patent: July 2, 2013
    Assignee: IFP Energies Nouvelles
    Inventors: Nathalie Cougard, Arnaud Baudot, Vincent Coupard
  • Publication number: 20130105296
    Abstract: This invention provides a method for purifying HFO-1234yf by removing HF from a mixture of HFO-1234yf and HF under simple and economically advantageous conditions.
    Type: Application
    Filed: July 21, 2011
    Publication date: May 2, 2013
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takehiro Chaki, Kazuhiro Takahashi
  • Publication number: 20130081936
    Abstract: In one embodiment, the invention is to a process for producing an acrylate product. The process comprises the step of providing a crude product stream comprising the acrylate product and an alkylenating agent. The process further comprises the step of separating at least a portion of the crude product stream to form an alkylenating agent stream and an intermediate product stream. The alkylenating agent stream comprises at least 1 wt % alkylenating agent and the intermediate product stream comprises acrylate product. The separating is performed in at least one column at an operating pressure ranging from 40 kPa to 80 kPa.
    Type: Application
    Filed: January 6, 2012
    Publication date: April 4, 2013
    Applicant: CELANESE INTERNATIONAL CORPORATION
    Inventors: Craig Peterson, Josefina Chapman, Jonathan Gallacher
  • Patent number: 8382961
    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: Grant
    Filed: June 7, 2010
    Date of Patent: February 26, 2013
    Assignee: AMT International, Inc.
    Inventors: Ji-Young Jang, Kuang-Yeu Wu, Ming-Mou Yang
  • Publication number: 20120312680
    Abstract: The disclosure relates to a process for separating propylene oxide for a crude propylene oxide stream, for example an intermediate stream from a PO/TBA process. The crude propylene oxide stream can be passed through an extractive distillation column. The distillation column is operated at a pressure in a range of greater than 25 up to 50 psig, and/or at a temperature in a range of from 70 to 150 degrees Celsius using C8-C20 paraffin as extractive solvent with an overhead distillate water wash drum. The crude propylene oxide stream include from 0.001 to 0.1 wt % methanol, based on the total composition of the crude propylene oxide stream. The systems, methods, and apparatuses can produce a propylene oxide stream having less formaldehyde and acetaldehyde than the prior art.
    Type: Application
    Filed: June 7, 2011
    Publication date: December 13, 2012
    Inventors: Xiangmin LI, David W. Leyshon, Te Chang
  • Patent number: 8080140
    Abstract: A process for debottlenecking a system for the separation of a conjugated diolefin the system including a first extraction section having an extractive distillation column and a stripping column and a second extraction section. The process includes the steps of withdrawing a first portion of an extract from the extractive distillation column, the extract having at least the first portion and a second portion, and transferring the first portion of the extract to a flash/separation vessel; separating the first portion of the extract into a vapor phase and a liquid phase by flashing in a flash/separation vessel; and combining the liquid phase of the separated first portion of the extract with the second portion of the extract to produce an extract feed for further processing. A system and process for the separation of a conjugated diolefin from a C4- or C5-hydrocarbon mixture containing the conjugated diolefin and higher acetylenes are also provided.
    Type: Grant
    Filed: April 18, 2007
    Date of Patent: December 20, 2011
    Assignee: Exxonmobil Chemical Patents Inc.
    Inventors: May-Ru Chen, Micheal E. Smith, Ross T. Garner
  • Patent number: 8062483
    Abstract: Crude chlorosilane streams containing lower-boiling chlorosilanes and higher-boiling chlorosilanes are separated by contacting them with a distillation aid. The lower-boiling chlorosilanes are separated from the crude chlorosilane stream, and then the distillation aid and the higher-boiling chlorosilanes are separated from one another. The distillation aid is a mono-cyano-substituted organic compound, a nitro-substituted organic compound, a mono-cyano-substituted organosilicon compound, a nitro-substituted organosilicon compound, or a mixture thereof. These distillation aids increase the relative volatility of crude chlorosilane streams such as methyltrichlorosilane and dimethyldichlorosilane resulting in improved separation at lower capital and/or fixed costs.
    Type: Grant
    Filed: December 6, 2006
    Date of Patent: November 22, 2011
    Assignee: Dow Corning Corporation
    Inventors: David Clay Miller, Jonathan David Wineland, Ora L. Flaningam
  • Patent number: 7879199
    Abstract: A process for the preparation of an alkali metal salt of 4-chloro-4?-hydroxy benzophenone including the steps of (a) preparing purified 4-chloro-4?-hydroxy benzophenone by a process including distilling under reduced pressure a liquid containing 4-chloro-4?-hydroxy benzophenone and a solvent selected from diphenyl sulphone, diphenylene sulphone, benzophenone and dichlorobenzophenone, and then (b) preparing the alkali metal salt of thus purified 4-chloro-4?-hydroxy benzophenone by the reaction of the purified 4-chloro-4?-hydroxy benzophenone with a stoichiometric excess of at least one alkali metal base. There is also described a polymerization process using the alkali metal salt to yield PEK with high inherent viscosity and improved mechanical and thermal properties.
    Type: Grant
    Filed: April 29, 2008
    Date of Patent: February 1, 2011
    Assignee: Gharda Chemicals Limited
    Inventors: Keki Hormusji Gharda, Ashokkumar M. Malte, Suchet S. Mathur, Pulinattu C. Joseph, Mathew Abraham, Janardan K. Nambodari, Sanjay C. Limaye, Shekhar V. Sathe, Kailas Ambadas Chavan, Deepak R. Naladkar
  • Patent number: 7699962
    Abstract: The invention relates to methods for separating mixture components such as reactor effluent components. In particular, the invention relates to the use of an extractive agent such as a hydrocarbon in an extractive distillation process to separate monomers such as a C4-C7 isoolefins such as isobutylene from mixtures such as reactor effluents including one or more hydrofluorocarbon(s) (HFC).
    Type: Grant
    Filed: June 23, 2004
    Date of Patent: April 20, 2010
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Michael Francis McDonald, Ralph Howard Schatz, Claude André Gautier, Richard Dwight Hembree
  • Patent number: 7692053
    Abstract: 1,3-butadiene is obtained by extractive distillation with a selective solvent from a C4 cut comprising C4 acetylenes as secondary components in a dividing wall column having a bottom evaporator, in which a dividing wall is disposed in the longitudinal direction of the column to form a first subregion, a second subregion and a lower combined column region. The column is disposed upstream of an extractive wash column. The energy input into the dividing wall column via the bottom evaporator is controlled in such a way that a bottom stream containing solvent, C4 acetylenes and 1,3-butadiene restricted such that the loss of 1,3-butadiene is economically acceptable, is drawn off and fed to an acetylenes outgasser where the C4 acetylenes are stripped out overhead and purified solvent is obtained as the bottom stream.
    Type: Grant
    Filed: February 4, 2005
    Date of Patent: April 6, 2010
    Assignee: BASF Aktiengesellschaft
    Inventor: Bernd Heida
  • Publication number: 20090166176
    Abstract: Process for distillatively purifying polymerizable compounds using a high-boiling, inert, thermally long-term-stable substance as a boiling oil, characterized in that the boiling oil is disposed in the bottom of a rectification column.
    Type: Application
    Filed: March 14, 2007
    Publication date: July 2, 2009
    Applicant: EVONIK ROEHM GMBH
    Inventors: Dirk Broell, Hermann Siegert
  • Publication number: 20090026062
    Abstract: Crude chlorosilane streams containing lower-boiling chlorosilanes and higher-boiling chlorosilanes are separated by contacting them with a distillation aid. The lower-boiling chlorosilanes are separated from the crude chlorosilane stream, and then the distillation aid and the higher-boiling chlorosilanes are separated from one another. The distillation aid is a mono-cyano-substituted organic compound, a nitro-substituted organic compound, a mono-cyano-substituted organosilicon compound, a nitro-substituted organosilicon compound, or a mixture thereof. These distillation aids increase the relative volatility of crude chlorosilane streams such as methyltrichlorosilane and dimethyldichlorosilane resulting in improved separation at lower capital and/or fixed costs.
    Type: Application
    Filed: December 6, 2006
    Publication date: January 29, 2009
    Applicant: DOW CORNING CORPORATION
    Inventors: David Clay Miller, Jonathan David Wineland, Oral L. Flaningam
  • Patent number: 7435318
    Abstract: The invention relates to a process for separating close-boiling, homo- and heteroazeotropic mixtures by using ionic liquids. Due to the selectivity and unusual combination of properties of the ionic liquids the process is superior to conventional extractive rectification from the point of view of costs and energy.
    Type: Grant
    Filed: March 14, 2002
    Date of Patent: October 14, 2008
    Assignee: BASF Aktiengesellschaft
    Inventors: Wolfgang Arlt, Matthias Seiler, Carsten Jork, Thomas Schneider
  • Publication number: 20080210541
    Abstract: The present invention relates to an improved process of distilling fermented mash, wherein one or more amylases and/or proteases are added to the fermentation mash before or during distillation.
    Type: Application
    Filed: April 6, 2005
    Publication date: September 4, 2008
    Applicants: Novozymes North America, Inc., Broin and Associates, Inc.
    Inventors: Kevin S. Wenger, Eric Allain, Stephen M. Lewis, John Michael Finck, Debbie Lynn Roth
  • Patent number: 7371309
    Abstract: The present invention provides extractive distillation processes for removing difluoromethane (HFC-32) from a mixture comprising HFC-32 and at least one of chlorodifluoromethane (CFC-12), 1,1,1-trifluoroethane (HFC-143a), chloropentafluoroethane (CFC-115), and pentafluoroethane (HFC-125) using hydrocarbon, chlorocarbon, and oxygen-containing extractive agents.
    Type: Grant
    Filed: August 12, 1998
    Date of Patent: May 13, 2008
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Sara W. Boehmer, Barry Asher Mahler, Ralph Newton Miller
  • Patent number: 7338579
    Abstract: A formaldehyde-containing product is separated from a formalin solution containing formaldehyde, water, and methanol by distilling in the presence of a water entraining compound, especially methyl propionate or methyl methacrylate. The product contains substantially less water than in the solution and may be used, for example, in a further process which requires a source of formaldehyde containing a relatively low level of water, for example, the catalyzed reaction of methy propionate with formaldehyde and methanol to produce methyl methacrylate.
    Type: Grant
    Filed: May 23, 2002
    Date of Patent: March 4, 2008
    Assignee: Lucite International UK Limited
    Inventor: William David Parten
  • Patent number: 7323579
    Abstract: A method of separating propylene oxide from a mixture (M) comprising 5 to 50 percent by weight propylene oxide and 50 to 85 percent by weight methanol, said method comprising (i) introducing said mixture (M) into an extractive distillation column; (ii) additionally introducing a polar solvent into said extractive distillation column; (iii) distilling propylene oxide overhead from said extractive distillation column at a bottoms temperature of from 40 to 70° C. and at a pressure of from 300 to 750 mbar.
    Type: Grant
    Filed: July 7, 2004
    Date of Patent: January 29, 2008
    Assignees: BASF Aktiengesellschaft, The Dow Chemical Company Legal Department Intellectual Property Section
    Inventors: Hans-Georg Göbbel, Henning Schultz, Peter Schultz, Renate Patrascu, Malte Schulz, Meinolf Weidenbach
  • Patent number: 7311807
    Abstract: A process for the separation of dichlorobenzene mixtures containing m- and p-dichlorobenzene in which: (i) the mixture is as an extracting agent contacted with a phosphoric ester of the general formula (I) as an extracting agent in which R1, R2 and R3 are identical or different and represent an aliphatic or cycloaliphatic alkyl or alkenyl radical and R1, R2, and R3 together contain at least 3C-atom and not more than 12 C-atoms, or a mixture of different phosphoric esters (I) of formula or is contacted with a phosphine oxide of the general formula (II) as an extracting agent in which R1, R2 and R3 are identical or different and represent an aliphatic or cycloaliphatic alkyl or alkenyl radical or hydrogen, and R1, R2 and R3 together contain at least 3 C-atoms and not more than 12 C-atoms, or a mixture of different phosphine oxides of formula (II) or a mixture of said phosphoric esters of formula (I) and phosphine oxides of formula (II), and subsequently (ii) the components of the mixture are
    Type: Grant
    Filed: November 4, 2003
    Date of Patent: December 25, 2007
    Assignee: Lanxess Deutschland GmbH
    Inventors: Gültekin Erdem, Morris Leckebusch, Günter Olf, Kay-Jochen Rinck, Günter Zühlke
  • Patent number: 7205438
    Abstract: A diene production stream comprising a solvent recovery blend from diene production comprising one or more fouling agent, one or more extractive distillation solvent, and from about 1 ppm to about 1000 ppm of N,N-disubstituted amide.
    Type: Grant
    Filed: March 9, 2005
    Date of Patent: April 17, 2007
    Assignee: Baker Hughes Incorporated
    Inventor: Marilyn Wood Blaschke
  • Patent number: 7182839
    Abstract: Methods and compositions effective to prevent deposition of fouling agents, preferably polymerization precursors, on handling equipment, particularly during solvent recovery.
    Type: Grant
    Filed: August 6, 2001
    Date of Patent: February 27, 2007
    Assignee: Baker Hughes Incorporated
    Inventor: Marilyn Wood Blaschke
  • Patent number: 7153397
    Abstract: A process for the purification of fluoromethyl hexafluoroisopropyl ether which comprises contacting a crude composition comprising fluoromethyl hexafluoroisopropyl ether and hexafluoroisopropyl alcohol with a modifier in the presence of which the vapor pressure of the ether and/or the alcohol is modified whereby the difference in vapor pressure of the ether and the alcohol increases relative to the difference in vapor pressure of the ether and alcohol in the absence of the modifier and separating the ether from the alcohol.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: December 26, 2006
    Assignee: Ineos Fluor Holdings Limited
    Inventors: Andrew Paul Sharratt, Lee Colin Draper
  • Patent number: 7141641
    Abstract: A method and apparatus for continuously producing an alkyl aryl ether and a diaryl carbonate by reacting a dialkyl carbonate and an aromatic alcohol in presence of a transesterification catalyst.
    Type: Grant
    Filed: June 26, 2003
    Date of Patent: November 28, 2006
    Assignee: General Electric Company
    Inventors: Vutukuru Lakshmi Narasimha Murthy, Ignacio Fernandez Vic, Ganesh Kailasam, Alberto Nisoli
  • Patent number: 7118654
    Abstract: A chimney tray for a column for thermal treatment of a liquid. The chimney tray includes a total take-off of liquid by a drain connection arranged at an edge of the chimney tray, and having one or more drain channels having a gradient in a direction of the drain connection, and having a gradient in a direction of the one or more drain channels.
    Type: Grant
    Filed: December 5, 2002
    Date of Patent: October 10, 2006
    Assignee: BASF Aktiengesellschaft
    Inventors: Ulrich Hammon, Juergen Schroeder
  • Patent number: 7049450
    Abstract: A process for the purification of a crude propene oxide containing methanol and acetaldehyde by a continuously operated extractive distillation using an extraction solvent lowering the volatility of methanol and feeding a compound containing an unsubstituted NH2 group capable of reacting with acetaldehyde to a distillation column at a point above the feeding point of the crude propene oxide to give a purified propene oxide containing less than 100 ppm methanol and less than 100 ppm acetaldehyde. There is also disclosed a process for the catalytic epoxidation of propene that includes this purification stage.
    Type: Grant
    Filed: November 26, 2003
    Date of Patent: May 23, 2006
    Assignees: Degussa AG, UHDE GmbH
    Inventors: Willi Hofen, Thomas Haas, Wolfgang Wöll, Georg Thiele
  • Patent number: 6964728
    Abstract: Bisphenol-A-bis(neopentylglycolphosphate) products of enhanced properties and processes for preparing them are described. One of the processes includes (a) mixing and reacting neopentyl glycol and bisphenol-A-bis(dichlorophosphate) in an inert polar organic solvent which (1) if mixed by itself with an equal volume of water at 25° C., will form a separate phase, (2) the solvent by itself will dissolve at least about 10 wt % of bisphenol-A-bis(neopentylglycolphosphate) at a temperature in the range of 25 to 50° C., and optionally but preferably (3) the solvent by itself can be completely vaporized at a temperature below about 180° C.; (b) washing bisphenol-A-bis(neopentylglycolphosphate) product formed in a) while dissolved in inert organic solvent having such characteristics at least once with an aqueous alkaline washing solution; and (c) optionally but preferably, recovering bisphenol-A-bis(neopentylglycolphosphate) product from organic solvent having such characteristics.
    Type: Grant
    Filed: May 16, 2002
    Date of Patent: November 15, 2005
    Inventors: Bonnie G. McKinnie, Robert E. Williams, Gary L. Sharp, Alireza M. Dadgar
  • Patent number: 6818121
    Abstract: Indene is produced from an indene-containing coal tar distillate by adding a glycol to the indene-containing coal tar distillate and then conducting azeotropic distillation to obtain an indene fraction while eliminating benzonitrile from the indene-containing coal tar distillate.
    Type: Grant
    Filed: January 25, 2001
    Date of Patent: November 16, 2004
    Assignee: JFE Chemical Corporation
    Inventors: Hiroaki Mori, Youko Sugio
  • Patent number: 6802959
    Abstract: A process for separating olefins from sulfur-containing hydrocarbons contained in a hydrocarbon feedstock is disclosed and includes contacting the hydrocarbon feedstock with N-hydroxyethyl pyrollidone in a contacting zone, removing at least one olefin overhead from the contacting zone, and removing at least a portion of the sulfur-containing hydrocarbons off the bottom of the contacting zone along with the N-hydroxyethyl pyrollidone.
    Type: Grant
    Filed: June 23, 2000
    Date of Patent: October 12, 2004
    Assignee: ConocoPhillips Company
    Inventor: Ronald E. Brown
  • Publication number: 20040144637
    Abstract: A process for the separation of dichlorobenzene mixtures containing m- and p-dichlorobenzene by means of extractive rectification using an extracting agent is described.
    Type: Application
    Filed: November 4, 2003
    Publication date: July 29, 2004
    Inventors: Gultekin Erdem, Morris Leckebusch, Gunter Olf, Kay-Jochen Rinck, Gunter Zuhlke
  • Patent number: 6632330
    Abstract: A process for the recovery of substantially pure alkyl alkanoate, such as ethyl acetate, from an impure feedstock. The impure feedstock is contacted with a selective hydrogenation catalyst in the presence of hydrogen in a selective hydrogenation zone maintained under selective hydrogenation conditions effective for selective hydrogenation of impurities containing reactive carbonyl groups thereby to hydrogenate the impurities to the corresponding alcohols. After recovery from the selective hydrogenation zone of a selectively hydrogenated reaction product mixture including the alkyl alkanoate and the corresponding alcohols, this is distilled in one or more distillation zones so as to produce substantially pure alkyl alkanoate therefrom which is recovered.
    Type: Grant
    Filed: June 5, 2001
    Date of Patent: October 14, 2003
    Assignee: Davy Process Technology Limited
    Inventors: Stephen William Colley, Norman Harris, Colin Rathmell
  • Publication number: 20030183502
    Abstract: A process for purifying alicyclic alcohols by distillation, wherein the alicyclic alcohols are distilled in the presence of from 1 to 550 ppm of acidic compounds.
    Type: Application
    Filed: December 13, 2002
    Publication date: October 2, 2003
    Inventors: Wolfgang Dukat, Peter Lappe, Klaus Schmid, Horst Scholz, Edgar Storm
  • Patent number: 6605193
    Abstract: A method for isolating 32 from a crude mixture containing HCl and an azeotropic mixture of 32 and HF is provided without the need to isolate any HF azeotrope.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: August 12, 2003
    Assignee: Atofina Chemicals, Inc.
    Inventor: John A. Wismer
  • Publication number: 20030146081
    Abstract: A method of recovering acrylic acid from a mixture comprising acrylic acid, water and acetic acid is disclosed, which includes: (a) extracting acrylic acid from the mixture with a solvent mixture comprising ethyl acrylate as the preponderant component thereof and an organic co-solvent selected from the group consisting of toluene, heptane, 1-heptene, methylcyclohexane, cycloheptane, cycloheptadiene, cycloheptatriene, 2,4-dimethyl-1,3 pentadiene, methylcyclohexene and methylenecyclohexene to form an extracted composition; and (b) azeotropically distilling the extracted composition to recover acrylic acid.
    Type: Application
    Filed: January 8, 2002
    Publication date: August 7, 2003
    Inventors: Salvador Aldrett, Diane Elizabeth Allen, Nathan K. Powell, Christopher Lawrence Wilkins, Edmund Jungpiao Yang
  • Publication number: 20030116422
    Abstract: The present invention provides extractive distillation processes for removing difluoromethane (HFC-32) from a mixture comprising HFC-32 and at least one of chlorodifluoromethane (CFC-12), 1,1,1-trifluoroethane (HFC-143a), chloropentafluoroethane (CFC-115), and pentafluoroethane (HFC-125) using hydrocarbon, chlorocarbon, and oxygen-containing extractive agents.
    Type: Application
    Filed: February 11, 2000
    Publication date: June 26, 2003
    Inventors: SARA W. BOEHMER, BARRY ASHER MAHLER, RALPH NEWTON MILLER
  • Patent number: 6582565
    Abstract: Disclosed is a process for the recovery and purification of 3,4-epoxy-1-butene (epoxybutene) from mixtures comprising epoxybutene and aliphatic and aromatic hydrocarbons containing five to seven carbon atoms having boiling points between about 20° C. and 115° C. by means of extractive distillation of the epoxybutene using certain extractive distillation solvents.
    Type: Grant
    Filed: January 17, 2002
    Date of Patent: June 24, 2003
    Assignee: Eastman Chemical Company
    Inventors: Scott Donald Barnicki, Robert Sterling Kline
  • Patent number: 6551502
    Abstract: A process for the removal of sulfur compounds from a hydrocarbon stream is disclosed. In a preferred embodiment, the process includes extractive distillation of a gasoline stream from a fluid catalytic cracker to reject olefins to a raffinate stream and simultaneously extract sulfur compounds to an extract stream.
    Type: Grant
    Filed: October 12, 2000
    Date of Patent: April 22, 2003
    Assignee: GTC Technology Corporation
    Inventors: Fu-Ming Lee, Joseph C. Gentry, Randi Wright Wytcherley, Lucia Cretoiu, Calambur Shyamkumar
  • Patent number: 6478929
    Abstract: A formaldehyde-containing product is separated from a formalin solution containing formaldehyde, water and methanol by distilling the solution in the presence of a water entraining compound, especially methyl propionate or methyl methacrylate. The product contains substantially less water than in the solution and may be used, for example, in a further process which requires a source of formaldehyde containing a relatively low level of water, for example, the catalyzed reaction of methyl propionate with formaldehyde and methanol to produce methyl methacrylate.
    Type: Grant
    Filed: January 22, 2001
    Date of Patent: November 12, 2002
    Assignee: Lucite International UK Limited
    Inventor: William David Parten
  • Patent number: 6475348
    Abstract: A mixture contains one or more vinyl-containing compounds as component (A) and, as a further component, a stabilizer (B) which contains one or more readily volatile nitroxyl compounds as component (b1), one or more sparingly volatile nitroxyl compounds as component (b2), if required one or more aromatic nitro compounds as component (b3) and, if required, one or more iron compounds as component (b4). Stabilizers (B) contain the components (b1) and (b2), (b1) and (b2) and (b3), (b1) and (b2) and (b4), and (b1), (b2), (b3) and (b4), and the premature polymerization of vinyl-containing compounds during their purification or distillation is inhibited by a process in which a stabilizer (B) is added or the components of stabilizer (B) are added as individual substances or in at least two groups of the components.
    Type: Grant
    Filed: December 17, 1999
    Date of Patent: November 5, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Heinz Friedrich Sutoris, Konrad Mitulla, Jacques Dupuis, Claus Kaliba
  • Patent number: 6458249
    Abstract: Nitrogen trifluoride (NF3) containing less than 10 parts-per-million molar impurities, e.g., tetrafluoromethane (PFC-14), is disclosed. Azeotropic and extractive distillation processes using entraining agents for separating NF3 and PFC-14 from each other and from mixtures with other electronics industry materials are disclosed.
    Type: Grant
    Filed: November 9, 1998
    Date of Patent: October 1, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Ralph Newton Miller, Chien-Ping Chai Kao, Barry Asher Mahler