Organic Material Patents (Class 203/38)
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Patent number: 7048834Abstract: The present invention provides an industrially easy and economical method for purification of acrylic acid which enables to efficiently eliminate impurities from a crude acrylic acid containing aldehydes as the impurities while the formation of acrylic acid polymer is inhibited. The method for purification of acrylic acid includes the step of distilling a crude acrylic acid which is charged with an aldehyde treatment chemical, wherein the concentration ratio of furfural to acrolein by weight in the crude acrylic acid is adjusted so as to satisfy the following equation: (furfural concentration by weight)/(acrolein concentration by weight)?100.Type: GrantFiled: December 21, 2000Date of Patent: May 23, 2006Assignee: Nippon Shokubai Co., Ltd.Inventors: Yoshitake Ishii, Kouji Ueno, Kazuhiko Sakamoto, Sei Nakahara, Masatoshi Ueoka, Tetsuji Mitsumoto, Takeshi Nishimura, Mamoru Takamura, Hisao Nakama
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Patent number: 6964728Abstract: 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: GrantFiled: May 16, 2002Date of Patent: November 15, 2005Inventors: Bonnie G. McKinnie, Robert E. Williams, Gary L. Sharp, Alireza M. Dadgar
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Patent number: 6939444Abstract: 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: GrantFiled: June 7, 2002Date of Patent: September 6, 2005Assignee: Rohm and Haas CompanyInventors: Curtis Instad Carlson, Jr., Michael Stanley DeCourcy, Jamie Jerrick John Juliette, Thomas Albert Kaminski, Nicole Rendon Koegel, Nelson Ivan Quiros, Paul Benjamin Schladenhauffen, Peter John Schmeidler, Robert R. Maven, William Harry Engle, Jr., Arthur Meisch
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Patent number: 6849162Abstract: A process for the preparation of propylene oxide in the presence of methanol, in which propylene oxide is separated from a mixture propylene oxide and methanol, and the resultant methanol containing mixture is worked up, including seperating methanol from a mixture comprising methanol and methyl formate during the work-up.Type: GrantFiled: July 5, 2001Date of Patent: February 1, 2005Assignee: BASF AktiengesellschaftInventors: Joaquim Henrique Teles, Alwin Rehfinger, Peter Bassler, Anne Wenzel, Norbert Rieber, Peter Rudolf
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Patent number: 6790319Abstract: A method for recovering a titanium compound includes bringing a waste solution containing a titanium alkoxide into contact with a halogenating agent to convert at least a part of the titanium alkoxide to a titanium halide, and then distilling the solution containing the titanium halide to recover the titanium halide from the solution, or the method includes distilling a waste solution containing a titanium alkoxide and a titanium halide to recover at least a part of the titanium halide from the waste solution, bringing a residue in a distiller after the distillation into contact with a halogenating agent to convert at least a part of the titanium alkoxide to a titanium halide, and distilling the solution containing the titanium halide to recover the titanium halide from the solution. The method can recover an increased amount of a titanium compound from a waste solution containing a titanium alkoxide.Type: GrantFiled: November 28, 2001Date of Patent: September 14, 2004Assignee: Mitsui Chemicals, Inc.Inventors: Takumi Kitahara, Tetsuya Nakano
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Publication number: 20040055867Abstract: The invention pertains to a process for separating at least one reactive component from a liquid mixture of substances with at least two coupled reactive distillation columns in which at least one secondary product is removed from the system. The invention also describes devices for implementing this process.Type: ApplicationFiled: June 25, 2003Publication date: March 25, 2004Inventors: Erik Stein, Kai Sundmacher, Achim Kienle
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Publication number: 20040000471Abstract: The present invention concerns a process for providing tertiary amine products which are color-stable, and have a greatly reduced tendency to take on color during their storage. According to the invention, an ethyleneamine derivative is added to the distillation pot prior to or during the distillation of the tertiary amine product. Preferably, the ethyleneamine derivative has a higher boiling point than the desired tertiary amine product so as to preclude the ethyleneamine from distilling over with the tertiary amine.Type: ApplicationFiled: June 6, 2003Publication date: January 1, 2004Applicant: Huntsman Petrochemical CorporationInventors: Wei-Yang Su, Mark L. Posey, Maarten P. ter Weeme
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Patent number: 6632330Abstract: 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: GrantFiled: June 5, 2001Date of Patent: October 14, 2003Assignee: Davy Process Technology LimitedInventors: Stephen William Colley, Norman Harris, Colin Rathmell
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Publication number: 20030164284Abstract: Less colored trans-1,3-dichloropropene and a process for producing it, are presented.Type: ApplicationFiled: March 27, 2003Publication date: September 4, 2003Applicant: ASAHI GLASS COMPANY LIMITEDInventors: Tomoko Matsumoto, Tateo Nakano, Yutaka Yokoyama
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Publication number: 20030109757Abstract: The present invention provides a method for separating and recovering propargyl alcohol from a product mixture containing a solvent, water and propargyl alcohol, which alleviates the problems of prior art and which can separate and recover propargyl alcohol in a simple operation at an advantageous thermal energy without requiring a large distillation unit or a complicated separation operation or step.Type: ApplicationFiled: November 8, 2002Publication date: June 12, 2003Inventors: Hideki Omori, Goro Sawada, Hideo Fukuda, Tomohiko Sato, Mitsuru Takeuchi
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Patent number: 6554966Abstract: The invention relates to a process for preparing essentially formic acid-free N-alkyl-N′-methylalkyleneureas of the formula with R1=H or CH3, R2=CnH2n+1 with n=1-4 and x=0 or 1, from the corresponding alkyleneureas by reaction with monomeric or polymerized formaldehyde in the presence of formic acid. This entails feeding the mixture, obtained in the reaction, of N-alkyl-N′-methylalkyleneurea and formic acid to the upper region of a distillation column, distilling without further additions and removing essentially formic acid-free N-alkyl-N′-methylalkyleneurea in the lower region of the column.Type: GrantFiled: June 26, 2000Date of Patent: April 29, 2003Assignee: BASF AktiengesellschaftInventors: Andreas Kramer, Johann-Peter Melder, Heinz Rütter, Günter Riewe, Wolfgang Siegel, Hans-Jürgen Weyer
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Patent number: 6491795Abstract: High-purity benzyl benzoate is recovered by distilling the residue remaining after removal of unreacted toluene and benzoic acid from a reaction mixture produced by the oxidation of toluene by molecular oxygen in the presence of a metal catalyst thereby separating a fraction of benzyl benzoate containing 80 wt % or more benzyl benzoate, 10 wt % or less benzoic acid and 10 wt % or less fluorenone, and purifying the fraction of benzyl benzoate by crystallization such as recrystallization. According to this process, it is possible to recover high-purity benzyl benzoate by a simple operation at low cost from the by-product formed in the manufacture of benzoic acid.Type: GrantFiled: February 8, 2001Date of Patent: December 10, 2002Assignee: Nippon Steel Chemical Co., Ltd.Inventors: Noboru Daitou, Shingo Ueda, Ryouji Akamine, Kazuyoshi Horibe, Katsuhiko Sakura
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Publication number: 20020147349Abstract: This invention concerns a process to provide high purity alkylene carbonate though use of multiple distillations wherein the unused fractions are recycled to the reactor. The high purity alkylene carbonate may be further purified by use of carbon to produce electrochromic or photochromic grade alkylene carbonate by reducing its UV absorbance.Type: ApplicationFiled: March 29, 2002Publication date: October 10, 2002Applicant: Huntsman Petrochemical CorporationInventors: James R. Machac, Edward T. Marquis, Ronald L. Savage, Susan A. Woodrum, John R. Sanderson
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Publication number: 20020110514Abstract: The method for recovering a titanium compound according to the invention comprises bringing a waste solution containing a titanium alkoxide into contact with a halogenating agent to convert at least apart of the titanium alkoxide to a titanium halide and then distilling the solution containing the titanium halide to recover the titanium halide from the solution, or comprises distilling a waste solution containing a titanium alkoxide and a titanium halide to recover at least a part of the titanium halide from the waste solution, bringing a residue in distiller given after the distillation into contact with a halogenating agent to convert at least a part of the titanium alkoxide to a titanium halide, and distilling the solution containing the titanium halide to recover the titanium halide from the solution. According to the method of the invention, a larger amount of a titanium compound can be recovered from a waste solution containing a titanium alkoxide.Type: ApplicationFiled: November 28, 2001Publication date: August 15, 2002Applicant: MITSUI CHEMICALS, INC.Inventors: Takumi Kitahara, Tetsuya Nakano
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Patent number: 6423189Abstract: A process for the preparation of 1,3-dichloropropane by reacting bis(3-hydroxypropyl)ether with hydrogen chloride, optionally in the presence of tertiary basic nitrogen compounds or other tertiary aliphatic bases as catalysts, distilling off the 1,3-dichloropropane and the water of reaction and working up the two phases.Type: GrantFiled: May 30, 2000Date of Patent: July 23, 2002Assignee: Degussa AGInventor: Manfred Kaufhold
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Patent number: 6365413Abstract: Thin film thermal oxidative engine oil or other oleaginous liquid deposit device has an oleaginous test liquid placement volume; a heatable depositor surface in liquid communication with the volume; a supply for at least one of an oxidant and another substance which can adversely affect the test liquid; and a relatively thin film forming unit which delivers the test liquid to the depositor surface in a relatively thin film. Thin film thermal oxidative engine oil or other oleaginous fluid deposit method is also provided, which includes providing an oleaginous test liquid in an oleaginous test liquid placement volume; providing a depositor surface and heating said surface; delivering the test liquid as a relatively thin film to the heated depositor surface; providing to the test liquid an oxidizing and/or other substance which can adversely affect the test liquid; and observing any deposits or other activity thereabout. The invention is useful in oil testing.Type: GrantFiled: February 25, 1999Date of Patent: April 2, 2002Assignee: Savant, Inc.Inventors: Richard H. Hall, David A. Dalman, Theodore W. Selby, Jennifer J. Richardson
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Publication number: 20020033324Abstract: Aldehyde compounds contained in polycyclic diols as impurities are effectively removed by distilling the polycyclic diols in the presence of an alkali metal compound and/or a alkaline earth compound. The distilled polycyclic diols are useful as a diol component of a polymer such as polycarbonate with less yellowing.Type: ApplicationFiled: July 26, 2001Publication date: March 21, 2002Inventors: Shu Yoshida, Satoshi Nagai, Takashi Konishi, Makoto Sasaki
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Process for the cleavage of alkyl tert-alkyl ethers into isoolefins and alkanols over acid catalysts
Publication number: 20020010379Abstract: Alkyl tert-alkyl ethers are cleaved into the corresponding isoolefins and alkanols by a process comprising acid-catalyzed reactive distilling an alkyl tert-alkyl ether fed into the reaction zone of a reactive distillation apparatus as an azeotrope of the alkyl tert-alkyl ether and the corresponding alkanol, wherein the reactive distillation apparatus is configured from bottom to top as a bottom zone, at least one distillation zone and a reaction zone.Type: ApplicationFiled: April 25, 2001Publication date: January 24, 2002Applicant: OXENO Olefinchemie GmbHInventors: Michael Sakuth, Axel Tuchlenski, Dieter Reusch, Andreas Beckmann -
Patent number: 6337412Abstract: A three stage process for producing propylene oxide from propylene, oxygen, and hydrogen. The first reaction step is the oxidation of isopropanol/water with molecular oxygen in a reaction-distillation column (approx. 500 psi and 350° F.), to produce hydrogen peroxide and acetone. The column is configured with an upper high liquid holdup reaction zone and a lower short residence time stripping zone. Inert gas circulating through the column effects separation of the hydrogen peroxide as part of the bottoms fraction and acetone as part of the distillate fraction. The liquid part of the distillate fraction comprising acetone, isopropanol and water is then reacted with hydrogen (second reaction step) under reactive-distillation conditions to convert the contained acetone back to isopropanol for subsequent recycle to the first reaction step. The third reaction step is the epoxidation of propylene (in stoichiometric excess) with the hydrogen peroxide solution in the presence of a titanium silicalite catalyst.Type: GrantFiled: April 24, 2001Date of Patent: January 8, 2002Assignee: Chemical Research & Licensing CompanyInventor: Abraham P. Gelbein
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Patent number: 6262314Abstract: A process for preparing ethers includes the steps of: providing a feedstock containing iso-olefins selected from the group consisting of C5 iso-olefins, C6 iso-olefins and mixtures thereof; mixing the feedstock with alkyl alcohol so as to provide a reaction feedstock, feeding the reaction feedstock to a reactor zone in the presence of a first etherification catalyst whereby the alkyl alcohol reacts with the iso-olefins to form alkyl-tert-alkyl ethers so as to provide an intermediate feedstock containing the ethers and unreacted iso-olefins and alkyl alcohol; feeding the intermediate feedstock to a catalytic distillation column having a second etherification catalyst defining a catalytic zone; mixing additional alkyl alcohol to the intermediate feedstock so as to form azeotropes of the alkyl alcohol with the unreacted iso-olefins without forming azeotropes of the alkyl alcohol with the ethers whereby the catalytic zone is substantially free of the ethers and the unreacted iso-olefins react with said alkyl alcType: GrantFiled: April 6, 1999Date of Patent: July 17, 2001Assignee: Intevep, S.A.Inventors: Leonardo Escalante, Jose Castor Gonzalez, Zaida Hernandez
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Publication number: 20010004960Abstract: The present invention provides an industrially easy and economical method for purification of acrylic acid which enables to efficiently eliminate impurities from a crude acrylic acid containing aldehydes as the impurities while the formation of acrylic acid polymer is inhibited.Type: ApplicationFiled: December 21, 2000Publication date: June 28, 2001Applicant: Nippon Shokubai Co., Ltd.Inventors: Yoshitake Ishii, Kouji Ueno, Kazuhiko Sakamoto, Sei Nakahara, Masatoshi Ueoka, Tetsuji Mitsumoto, Takeshi Nishimura, Mamoru Takamura, Hisao Nakama
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Patent number: 6207022Abstract: Crude (meth)acrylic acid is purified by a process in which a primary amine compound and an organic sulfonic acid are added to the crude (meth)acrylic acid and the latter is then worked up by distillation.Type: GrantFiled: October 7, 1994Date of Patent: March 27, 2001Assignee: BASF AktiengesellschaftInventors: Toni Dockner, Gerhard Nestler, Holger Herbst, Helmut Lermer, Hans Martan, Herbert Vogel, Herbert Exner
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Patent number: 6179966Abstract: The present invention concerns a method for producing acrylic acid which involves subjecting an acrylic acid-containing aqueous solution obtained by catalytic vapor phase oxidation of propylene and/or acrolein to evaporation whereby an acrylic acid-containing vapor is obtained; and subjecting the acrylic acid-containing vapor to azeotropic dehydration. The present invention offers a number of advantages including a reduce amount of polymer that may adhere to the surface of an azeotropic dehydration column, a low-blowing separation column or an in a high-boiling separation column in a plant for producing acrylic acid. Consequently, the production plant can be operated for a long time without stopping operations.Type: GrantFiled: November 17, 1998Date of Patent: January 30, 2001Assignee: Sumitomo Chemical Company, Ltd.Inventors: Toyomitsu Shimizu, Osamu Moriya, Kunihiko Shigematsu, Ryuji Matsushita
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Patent number: 6093845Abstract: This invention relates to a process for the simultaneous co-production of ethyl acetate and n-butyl acetate. The process involves reacting a reaction mixture of ethanol, n-butanol and acetic acid in the liquid phase, in the presence of an acidic catalyst. The process is carried out in a series of reactor and distillation columns. The process is capable of using relatively impure reactants and provides for removing some of the aldehyde type impurities by the use of resin guard beds.Type: GrantFiled: November 25, 1998Date of Patent: July 25, 2000Assignee: BP Chemicals LimitedInventors: Patrick Eduard van Acker, Olivier Mathieu, Russell James Milner, Witold Franciszek Pacynko
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Patent number: 6074532Abstract: A method for improving purification efficiency when distilling off aldehyde contaminants during chemical manufacturing processes by adding a substituted aromatic amine having electron donating group substituents prior to the distillation column. The method is particularly useful for removal of aldehydes such as acrolein, generated as a by-product of acrylonitrile manufacture. Preferred aromatic amines are 2-amino aniline, 3,4-dimethyl aniline and 4-ethyl aniline.Type: GrantFiled: November 5, 1998Date of Patent: June 13, 2000Assignee: Nalco/Exxon Energy Chemicals, L.P.Inventors: Natu R. Patel, Vincent E. Lewis, Margaret D. Enderson
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Patent number: 5993609Abstract: 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: GrantFiled: September 2, 1998Date of Patent: November 30, 1999Assignee: DSM Fine Chemicals Austria GmbHInventors: Karl Schwendinger, Engelbert Kloimstein
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Patent number: 5951829Abstract: A method of separating heteropoly compounds from mixtures of polyethers, polyesters and/or polyether esters, a protic component and heteropoly compounds, wherein the protic component is removed from the mixture and subsequently separating off the heteropoly compound as a separate phase. The polymer phase which remains is preferably brought into further contact with a solid adsorbent that is capable of adsorbing heteropoly compounds.Type: GrantFiled: March 27, 1997Date of Patent: September 14, 1999Assignee: BASF AktiengesellschaftInventors: Hans-Jurgen Weyer, Rolf Fischer, Gerhard Jeschek, Herbert Muller
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Patent number: 5929292Abstract: A production method which comprises reacting one or more feedstock compounds to form a desired compound having a boiling point higher than the feedstock compounds, wherein the reaction is carried out under reflux in a distillation column portion of a reactor provided with the distillation column.Type: GrantFiled: June 6, 1997Date of Patent: July 27, 1999Assignee: Asahi Glass Company Ltd.Inventors: Toru Shimoyama, Kazuya Oharu, Toru Ueno, Seisaku Kumai
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Patent number: 5902459Abstract: There is now provided a method of recycling toluenediisocyanate residue resulting from the production of toluenediisocyanate by the reaction of toluenediamine by phosgenation in the presence of a solvent. In accordance with the teachings of the present invention, the toluenediisocyanate residue is treated at reflux with an alkanolamine to obtain an intermediary product which is distilled thereby giving rise to various products including but not limited to at least one component selected from toluenediamine, oxazolidone and hydroxyethylimidiazolidone. Preferably the alkanolamine employed is a monoethanolamine.Type: GrantFiled: June 10, 1996Date of Patent: May 11, 1999Assignee: BASF CorporationInventors: Steven D. Gagnon, Sandy A. Bananto
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Patent number: 5817906Abstract: The present invention relates to a process for the production of light olefins comprising olefins having from 2 to 4 carbon atoms per molecule from a crude oxygenate feedstock. The crude oxygenate feedstock comprises an alcohol, and water. The process comprises passing the crude oxygenate feedstock to catalyst to a distillation with reaction zone to convert the alcohol to an ether and produce an ether product having a reduced water relative to the crude oxygenate feedstock and a first water stream. The ether product is passed to an oxygenate conversion zone containing a metal aluminosilicate catalyst to produce a light olefin stream.Type: GrantFiled: August 10, 1995Date of Patent: October 6, 1998Assignee: UOP LLCInventors: Terry L. Marker, Christopher David Gosling
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Patent number: 5759358Abstract: Processes are provided for producing a pure grade of acrylic acid having residual aldehyde levels under 10 parts per million. The processes apply selected groups of amines sequentially and, preferably, continuously in selectively reducing, for example, acrolein and furfural, and may be advantageously conducted in the presence of maleic acid and maleic anhydride impurities.Type: GrantFiled: October 27, 1995Date of Patent: June 2, 1998Assignee: Rohm and Haas CompanyInventors: William Bauer, Jr., Timothy Allen Hale, Robert Michael Mason, Rita Karina Upmacis, Lori Marie Petrovich
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Patent number: 5746892Abstract: A continuous process for producing a pure grade of acrylic acid having residual aldehyde levels under 10 parts per million. The process applies two groups of amines sequentially and continuously in selectively reducing acrolein and furfural and may be advantageously conducted in the presence of maleic acid and maleic anhydride impurities.Type: GrantFiled: August 5, 1996Date of Patent: May 5, 1998Assignee: Rohm and Haas CompanyInventors: William Bauer, Jr., Timothy Allen Hale, Robert Michael Mason, Rita Karina Upmacis
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Patent number: 5667644Abstract: A method for producing a dimerized aldehyde, which comprises subjecting a feed aldehyde to a condensation reaction and a dehydration reaction in the presence of a basic catalyst, wherein the feed aldehyde is the one having one or two hydrogen atoms at the .alpha.-position, an organic feed stream containing the feed aldehyde is supplied to a reactive distillation column, and the condensation reaction and the dehydration reaction are carried out simultaneously in the reactive distillation column.Type: GrantFiled: February 9, 1996Date of Patent: September 16, 1997Assignee: Mitsubishi Chemical CorporationInventors: Tomoyuki Mori, Kouichi Fujita, Yuuji Kajita, Masaki Takai
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Patent number: 5653853Abstract: A process by which iodine compounds contained in crude acetic anhydride or a mixture of crude acetic anhydride and crude acetic acid can be converted into methyl iodide having a low boiling point and which can be separated by distillation and efficiently removed by the combination of the conversion step with the heat treatment step and distillation step. The process includes the steps of heat-treating the crude acetic anhydride or the mixture of crude acetic anhydride and crude acetic acid in the presence of methanol and/or methyl acetate in a treatment tank and distilling the heat-treated crude acetic anhydride or the heat-treated mixture of crude acetic anhydride and crude acetic acid, in the presence of an alkali metal salt and/or an alkaline earth metal salt if necessary.Type: GrantFiled: June 3, 1996Date of Patent: August 5, 1997Assignee: Daicel Chemical Industries, Ltd.Inventors: Masahiro Kagotani, Yasuo Tsuji
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Patent number: 5605606Abstract: A method for the prevention of fouling in a distillation train of a hydrocarbon processing unit. The method involves the precipitation of foulants contained in the hydrocarbon fluid prior to distillation. Precipitation of fouling components occurs when the liquid to be distilled is contacted with a high boiling fluid which is a non-solvent for the foulant causing species but is a solvent for the liquid that is to be distilled.Type: GrantFiled: June 19, 1995Date of Patent: February 25, 1997Assignee: Nalco/Exxon Energy Chemicals. L.P.Inventor: Allen R. Syrinek
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Patent number: 5571386Abstract: The invention provides a continuous process for producing a pure grade of acrylic acid having residual aldehyde levels under 10 parts per million. The process applies two groups of amines sequentially and continuously in selectively reducing acrolein and furfural and may be advantageously conducted in the presence of maleic acid and maleic anhydride impurities.Type: GrantFiled: May 31, 1994Date of Patent: November 5, 1996Assignee: Rohm and Haas CompanyInventors: William Bauer, Jr., Timothy A. Hale, Robert M. Mason, Rita K. Upmacis
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Patent number: 5565069Abstract: A process for producing 5-vinyl-2-norbornene which comprises the steps of subjecting a liquid raw material in which tetrahydroindene/dicyclopentadiene ratio (by weight) falls within the range of from 5/100 to 80/100 to a thermal decomposition in liquid phase in the presence of an aromatic hydrocarbon solvent having a boiling point of from 250.degree. C. to 300.degree. C. at a reaction temperature of not lower than 200.degree. C. and lower than 240.degree. C.Type: GrantFiled: May 26, 1995Date of Patent: October 15, 1996Assignee: Sumitomo Chemical Company LimitedInventors: Nobuo Oi, Kazuo Kimura, Kenichi Nariyama
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Patent number: 5554796Abstract: A process for the purification of tertiary alkyl hydroperoxide containing contaminating quantities of primary and secondary alkyl hydroperoxides by contacting the impure hydroperoxide mixture with anhydrous carboxylic acid derivative such as maleic anhydride and subsequently reacting the resulting mixture with basic material such as aqueous caustic and recovering purified tertiary alkyl hydroperoxide.Type: GrantFiled: April 29, 1994Date of Patent: September 10, 1996Assignee: ARCO Chemical Technology, L.P.Inventors: Ahmad Soltani-Ahmadi, Robert N. Cochran
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Patent number: 5522971Abstract: Pure, substantially neutral, low-volatile organic compounds including reactive double bonds are advantageously isolated from a liquid feedstock which contains said compounds in combination with acidic reaction components or auxiliary materials by (i) adding to the feedstock, as neutralizing agents, finely powdered oxides, carbonates and/or hydroxides of the alkali metals and/or alkaline earth metals; (ii) adding, at the same time as the addition of the neutralizing agents or thereafter, a limited amount of water to the mixture of feedstock and neutralizing agents; (iii) mechanically mixing the liquid and solid mixture thus formed for at least a few minutes; (iv) distilling off water from the hot reaction mixture under reduced pressure; and (v) removal from the liquid product of the solid phase now present. Pure products which even without distillation exhibit low residual acid values in combination with low color values result.Type: GrantFiled: June 7, 1994Date of Patent: June 4, 1996Assignee: Henkel Kommanditgesellschaft auf AktienInventors: Wolfgang Ritter, Stefanie Ortanderl
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Patent number: 5516406Abstract: A method of purifying the oxidate product formed by the liquid phase oxidation of C.sub.4 -C.sub.8 paraffinic hydrocarbons comprises adding a strong acid catalyst to the oxidate product to catalyze the break down of Michael addition products of unsaturated carbonyls and carboxylic acids so that the carbonyls can be distilled off during the initial stages of purification.Type: GrantFiled: December 15, 1994Date of Patent: May 14, 1996Assignee: Hoechst Celanese CorporationInventors: Nicole G. Wallace, Kenneth A. Windhorst
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Patent number: 5487817Abstract: A novel process for the recovery of tocopherols and sterols from natural, especially vegetable, sources. This process is especially a process for the separation of tocopherols and sterols from deodorizer sludges by distillation of these deodorizer sludges, in that prior to the distillation the sterols present in the deodorizer sludge are esterified with the fatty acids which are also present, the resulting mixture is distilled to obtain residual fatty acids and subsequently to obtain tocopherols, whereby the sterol esters formed in the esterification remain in the residue of this distillation, and then the tocopherols are isolated from the distillate and the sterols, after cleavage of their esters, are isolated from the distillation residue.Type: GrantFiled: January 21, 1994Date of Patent: January 30, 1996Assignee: Hoffmann-La Roche Inc.Inventor: Christian Fizet
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Patent number: 5482597Abstract: In a process for purifying crude (meth)acrylic acid, the crude (meth)acrylic acid is worked up by distillation after addition of an organic carboxylic acid hydrazide and, if desired, an organic sulfonic acid.Type: GrantFiled: November 23, 1994Date of Patent: January 9, 1996Assignee: BASF AktiengesellschaftInventors: Holger Herbst, Gerhard Nestler, Jerry Darlington, Hans Martan
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Patent number: 5468350Abstract: The apparatus includes a container for accommodating water to be treated and evaporating the water. Container is attached with water supply for supplying the water to be treated into the container. The water to be treated in container is heated by a heater. Vapor evaporated from the inside of container is cooled by a cooler. Distilled water output from cooler is irradiated with ultraviolet light by a ultraviolet light irradiator. An organic decomposed substance contained in the distilled water irradiated with the ultraviolet light is removed by organic decomposed substance removal device, and ultrapure water is obtained.Type: GrantFiled: July 15, 1993Date of Patent: November 21, 1995Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Cozy Ban
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Process for recovering column bottom residues produced by fractional distillation of ethylene glycol
Patent number: 5423953Abstract: A process for recovering column bottom residues produced by distillation of ethylene glycol resulting from an aromatic polyester production process, involving treating the residues with an aromatic mono-alkyl ester and distilling the reaction product.Type: GrantFiled: January 27, 1994Date of Patent: June 13, 1995Assignee: Montefibre S.p.A.Inventors: Socrate Contessa, Riccardo Tesser, Salvatore Barrella -
Patent number: 5419815Abstract: The present invention relates to a process for purifying fatty acid amides, which contains the following process steps:neutralization of the fatty acid by addition of an aqueous alkaline solution andsubsequent distillation of the neutralized mixture.Type: GrantFiled: August 12, 1993Date of Patent: May 30, 1995Assignee: Hoechst AGInventors: Norbert Doerpinghaus, Siegbert Rittner
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Patent number: 5395486Abstract: Dehydrated compositions are obtained by: combining a hydrous composition, e.g., a hydrous electrolyte salt, with inert fluorochemical liquid; heating the resulting mixture in a vessel to volatilize water and inert fluorochemical liquid therein until the water content of the mixture is reduced to a desired level; optionally treating the resulting dehydrated mixture with another chemical material, e.g., a polar organic solvent; and optionally subjecting the dehydrated mixture or the treated dehydrated mixture to further treatment, e.g., separation of the mixture. Liquid electrolytes suitable for use in battery applications can be prepared by this method.Type: GrantFiled: October 19, 1993Date of Patent: March 7, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Michael E. Killian, John C. Stone
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Patent number: 5370774Abstract: The invention relates to a process for isolating pure diketene with recovery of materials of value by continuous, two-stage distillation of crude diketene at reduced pressure and with continuous reaction of the resulting distillation residue with acetic acid, pure diketene and acetic anhydride being separated off by means of the two-stage distillation. In the stabilization of the distillation residue with acetic acid, reutilizable acetic acid, which contains acetone with or without acetic anhydride, is recovered.Type: GrantFiled: November 3, 1993Date of Patent: December 6, 1994Assignee: Wacker-Chemie GmbHInventors: Gerhard Kuenstle, Alois Maier
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Patent number: 5344954Abstract: Diaryl carbonates are prepared from dialkyl carbonates and phenolic compounds by transesterification in the presence of a transesterification catalyst at 60.degree.-320.degree. C. in an apparatus composed of two columns in a continuous procedure. In the first column, the starting materials form essentially the associated alkyl aryl carbonate, from which, in the second column, the diaryl carbonate is produced by further transesterification and disproportionation.Type: GrantFiled: August 6, 1993Date of Patent: September 6, 1994Assignee: Bayer AktiengesellschaftInventors: Norbert Schon, Hans-Josef Buysch, Paul Wagner, Reinhard Langer
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Patent number: 5342487Abstract: A process for reducing the amount of unwanted di(meth)acrylate produced during the distillation of hydroxyalkyl acrylates or hydroxyalkyl methacrylates.Type: GrantFiled: October 8, 1991Date of Patent: August 30, 1994Assignee: Rohm and Haas CompnayInventors: Christine McDade, Makarand D. Phadke, William D. Weir
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Patent number: 5318673Abstract: Process for the purification of crude 1,1-dichloro -1-fluoroethane by treatment with chlorine in the presence of an organic free radical initiator and then distillation.Type: GrantFiled: April 6, 1993Date of Patent: June 7, 1994Assignee: Solvay (Societe Anonyme)Inventors: Rene Walraevens, Francine Janssens, Jean-Pierre Catinat