Patents by Inventor Pierre Coqueret
Pierre Coqueret has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 8231765Abstract: A method and a plant are disclosed for purifying lactams, particularly lactams obtained by cyclizing hydrolysis of aminonitrile. The purification of ?-caprolactam obtained by cyclizing hydrolysis of aminocapronitrile is described which includes eliminating the ammonia from the reaction medium of the hydrolysis, then recovering the lactam from the medium in purified form. The recovery is carried out by performing at least a distillation of the lactam in the presence of a base producing optionally a fronts fraction having compounds more volatile than the lactam, a fraction having the lactam to be recovered to the degree of desired purity and a distillation tails having the lactam and compounds less volatile than the lactam. The distillation tails are treated by various processes such as evaporation in thin layers to recover the major part of the caprolactam and recycling the latter in the purification process.Type: GrantFiled: May 29, 2008Date of Patent: July 31, 2012Assignee: Rhodia Polyamide IntermediatesInventors: Daniel Amoros, Philippe Leconte, Pierre Coqueret
-
Publication number: 20080230368Abstract: A method and a plant are disclosed for purifying lactams, particularly lactams obtained by cyclizing hydrolysis of aminonitrile. The purification of ?-caprolactam obtained by cyclizing hydrolysis of aminocapronitrile is described which includes eliminating the ammonia from the reaction medium of the hydrolysis, then recovering the lactam from said medium in purified form. The recovery is carried out by performing at least a distillation of the lactam in the presence of a base producing optionally a fronts fraction comprising compounds more volatile than the lactam, a fraction comprising the lactam to be recovered to the degree of desired purity and a distillation tails comprising the lactam and compounds less volatile than the lactam. The distillation tails are treated by various processes such as evaporation in thin layers to recover the major part of the caprolactam and recycling the latter in the purification process.Type: ApplicationFiled: May 29, 2008Publication date: September 25, 2008Applicant: RHODIA POLYAMIDE INTERMEDIATESInventors: Daniel Amoros, Philippe Leconte, Pierre Coqueret
-
Patent number: 7384518Abstract: A method and a plant are disclosed for purifying lactams, particularly lactams obtained by cyclizing hydrolysis of aminonitrile. The purification of ?-caprolactam obtained by cyclizing hydrolysis of aminocapronitrile is described which includes eliminating the ammonia from the reaction medium of the hydrolysis, then recovering the lactam from said medium in purified form. The recovery is carried out by performing at least a distillation of the lactam in the presence of a base producing optionally a fronts fraction comprising compounds more volatile than the lactam, a fraction comprising the lactam to be recovered to the degree of desired purity and a distillation tails comprising the lactam and compounds less volatile than the lactam. The distillation tails are treated by various processes such as evaporation in thin layers to recover the major part of the caprolactam and recycling the latter in the purification process.Type: GrantFiled: May 28, 2001Date of Patent: June 10, 2008Assignee: Rhodia Polyamide IntermediatesInventors: Daniel Amoros, Philippe Leconte, Pierre Coqueret
-
Patent number: 6884751Abstract: Hydrocyanation catalysts comprising aqueous solutions of at least one water-soluble phosphine and nickel values, well suited for the hydrocyanation of ethylenically unsaturated organic compounds such as diolefins, olefinic nitrites and monolefins, are produced by (a) admixing an aqueous solution of such at least one water-soluble phosphine with a nickel hydroxide, (b) adding hydrogen cyanide or a compound which generates hydrogen cyanide to the mixture thus formed, (c) stirring the resulting mixture until the nickel values have at least partially dissolved, and (d) reducing at least a portion of said nickel values having an oxidation state of greater than zero to the zero oxidation state.Type: GrantFiled: June 22, 2001Date of Patent: April 26, 2005Assignee: Rhodia Feber & Resin IntermedaitesInventors: Paolo Burattin, Pierre Coqueret, Marc Huser
-
Publication number: 20040014965Abstract: The invention concerns a method for purifying lactams, more particularly lactams obtained by cyclizing hydrolysis of aminonitrile. More particularly, the invention concerns the purification of &egr;-caprolactam obtained by cyclizing hydrolysis of aminocapronitrile which consists in eliminating the ammonia from the reaction medium of the hydrolysis then in recuperating the lactam from said medium in purified form. Said recuperation is carried out by performing at least a distillation of the lactam in the presence of a base producing optionally a fronts fraction comprising compounds more volatile than the lactam, a fraction comprising the lactam to be recuperated to the degree of desired purity and a distillation tails comprising the lactam and compounds less volatile than the lactam. The distillation tails are treated by various processes such as evaporation in thin layers to recuperate the major part of the comprised caprolactam and recycling the latter in the purification process.Type: ApplicationFiled: July 30, 2003Publication date: January 22, 2004Inventors: Daniel Amoros, Philippe Leconte, Pierre Coqueret
-
Publication number: 20030204109Abstract: Water-soluble sulfonated organophosphorus compounds are purified by at least partially removing contaminating sulfite values therefrom, by decreasing the pH of a solution of such sulfonated organophosphorus compounds to a value of less than or equal to 4, and maintaining the pH of the solution at this value of 4 or less for such period of time as to reduce the weight concentration of sulfite in the solution to less than 100 ppm; the organophosphorus compounds thus purified are well suited for the two-phase cocatalysis of a wide variety of organic reactions.Type: ApplicationFiled: April 22, 2003Publication date: October 30, 2003Applicants: RHODIA FIBER, RESIN INTERMEDIATESInventors: Larbi Aouni, Paolo Burattin, Pierre Coqueret, Marc Huser
-
Patent number: 6613939Abstract: Water-soluble sulfonated organophosphorus compounds are purified by at least partially removing contaminating sulfite values therefrom, by decreasing the pH of a solution of such sulfonated organophosphorus compounds to a value of less than or equal to 4, and maintaining the pH of the solution at this value of 4 or less for such period of time as to reduce the weight concentration of sulfite in the solution to less than 100 ppm; the organophosphorus compounds thus purified are well suited for the two-phase cocatalysis of a wide variety of organic reactions.Type: GrantFiled: June 25, 2001Date of Patent: September 2, 2003Assignee: Rhodia Fiber & Resin IntermediatesInventors: Larbi Aouni, Paolo Burattin, Pierre Coqueret, Marc Huser
-
Patent number: 6469194Abstract: Ethylenically unsaturated organic compounds, for example diolefins, olefinic nitriles and monoolefins, are noncontaminatingly hydrocyanated into corresponding nitriles by (a) reacting such ethylenically unsaturated organic compounds with hydrogen cyanide in the presence of an aqueous solution containing a catalytically effective amount of a catalyst which comprises at least one nickel compound and at least one water-soluble phosphine, (b) thereafter separating the organic phase from the aqueous phase which result, the separated aqueous phase comprising a solid phase formed during hydrocyanation, and (c) thence treating the separated aqueous phase, or a solid phase removed therefrom, with hydrogen cyanide to thus at least partially dissolve said solid phase contained therein or removed therefrom.Type: GrantFiled: June 22, 2001Date of Patent: October 22, 2002Assignee: Rhodia Fiber & Resin IntermediatesInventors: Paolo Burattin, Pierre Coqueret, Marc Huser
-
Publication number: 20020026066Abstract: Hydrocyanation catalysts comprising aqueous solutions of at least one water-soluble phosphine and nickel values, well suited for the hydrocyanation of ethylenically unsaturated organic compounds such as diolefins, olefinic nitrites and monolefins, are produced by (a) admixing an aqueous solution of such at least one water-soluble phosphine with a nickel hydroxide, (b) adding hydrogen cyanide or a compound which generates hydrogen cyanide to the mixture thus formed, (c) stirring the resulting mixture until the nickel values have at least partially dissolved, and (d) reducing at least a portion of said nickel values having an oxidation state of greater than zero to the zero oxidation state.Type: ApplicationFiled: June 22, 2001Publication date: February 28, 2002Inventors: Paolo Burattin, Pierre Coqueret, Marc Huser
-
Publication number: 20020022736Abstract: Ethylenically unsaturated organic compounds, for example diolefins, olefinic nitrites and monoolefins, are noncontaminatingly hydrocyanated into corresponding nitrites by (a) reacting such ethylenically unsaturated organic compounds with hydrogen cyanide in the presence of an aqueous solution containing a catalytically effective amount of a catalyst which comprises at least one nickel compound and at least one water-soluble phosphine, (b) thereafter separating the organic phase from the aqueous phase which result, the separated aqueous phase comprising a solid phase formed during hydrocyanation, and (c) thence treating the separated aqueous phase, or a solid phase removed therefrom, with hydrogen cyanide to thus at least partially dissolve said solid phase contained therein or removed therefrom.Type: ApplicationFiled: June 22, 2001Publication date: February 21, 2002Inventors: Paolo Burattin, Pierre Coqueret, Marc Huser
-
Publication number: 20020016497Abstract: Water-soluble sulfonated organophosphorus compounds are purified by at least partially removing contaminating sulfite values therefrom, by decreasing the pH of a solution of such sulfonated organophosphorus compounds to a value of less than or equal to 4, and maintaining the pH of the solution at this value of 4 or less for such period of time as to reduce the weight concentration of sulfite in the solution to less than 100 ppm; the organophosphorus compounds thus purified are well suited for the two-phase cocatalysis of a wide variety of organic reactions.Type: ApplicationFiled: June 25, 2001Publication date: February 7, 2002Inventors: Larbi Aouni, Paolo Burattin, Pierre Coqueret, Marc Huser