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| Number | Title | Issue Date |
| 7482446 | Amide-based compounds, production, recovery, purification and uses thereof Methods are disclosed of producing and purifying at least one amide. In accordance with one of the methods disclosed herein, the at least one amide is produced by providing an organic liquid comprising at least one oxime, providing at least one catalyst, adding the ... | 01/27/2009 |
| 7358357 | Process for preparing caprolactam by admixture of cyclohexanone oxime to a reaction mixture under turbulent flow conditions The invention relates to a process for preparing caprolactam by admixture of cyclohexanone oxime to a reaction mixture comprising caprolactam and sulfuric acid using a mixing device, said mixing device comprising (i) a tube through which the reaction mixture can flo... | 04/15/2008 |
| 7351820 | Process for preparing caprolactam by Beckmann rearrangement The invention relates to a process for preparing caprolactam by Beckmann rearrangement of cyclohexanone oxime by feeding cyclohexanone oxime to a reaction mixture comprising (i) sulfuric acid (ii) SO3 and (iii) caprolactam , wherein the SO3 con... | 04/01/2008 |
| 7339056 | Continuous process for preparing caprolactam The invention relates to a continuous process for preparing caprolactam by Beckmann rearrangement of cyclohexanone oxime, said process comprising a) feeding (i) oleum and (ii) cyclohexanone oxime into a first reaction mixture compr... | 03/04/2008 |
| 7189845 | Method for producing ε-caprolactam The invention provides a method for producing ε-caprolactam comprising the steps of: a reaction process which subjects cyclohexanone oxime to a Beckmann rearrangement reaction in the presence of a solid catalyst; and a catalyst regeneration process which regenerate... | 03/13/2007 |
| 7090817 | Process for the preparation of hydroxylammonium The invention relates to a process for the preparation of hydroxylammonium, said process comprising the steps of: a) feeding gaseous hydrogen to a reaction mixture, said reaction mixture comprising an aqueous reaction medium and a gaseous phase; ... | 08/15/2006 |
| 7084269 | Process for producing lactam It is an object of the present invention to provide an efficient method of continuously producing a lactam in high-temperature high-pressure water, and the present invention relates to a method of producing a lactam characterized by efficiently synthesizing the lact... | 08/01/2006 |
| 7045622 | Process for producing lactam It is an object of the present invention to provide a method of continuously producing a lactam in high-temperature high-pressure water, and the present invention relates to a method for producing a lactam characterized by selectively synthesizing the lactam without... | 05/16/2006 |
| 7022844 | Amide-based compounds, production, recovery, purification and uses thereof Methods are disclosed of producing and purifying at least one amide. In accordance with one of the methods disclosed herein, the at least one amide is produced by providing an organic liquid comprising at least one oxime, providing at least one catalyst, adding the ... | 04/04/2006 |
| 6750336 | Method of production of lactam A method for producing a lactam by using an organic solvent as a substrate solution, which makes it possible to introduce a high-concentration oxime into flowing high-temperature and high-pressure water, thereby allowing the high-concentration lactam to be synthesiz... | 06/15/2004 |
| 6713036 | Process for mixing and reacting two or more fluids A novel process for continuously mixing and reacting at least two fluids are disclosed. Excellent mixing and superior pressure drop characteristics are achieved using cyclone mixing where at least two supply channels feed a mixing chamber to create a vortex of the f... | 03/30/2004 |
| 6489474 | Process for producing amide compound Object of the present invention is to provide a process for producing an amide compound with high efficiency by subjecting an oxime compound to Beckmann rearrangement in a liquid phase under mild reaction conditions. Namely, the invention relates to a pro... | 12/03/2002 |
| 6469163 | Method for production of hydroxylamine sulfate in the conventional process for the synthesis of caprolactam An improvement in the conventional process for the production of caprolactam. The process involves: (a) reacting air with ammonia gas in an ammonia conversion zone to produce nitric oxide; (b) oxidizing a portion of the nitric oxide to nitrogen dioxide to prod... | 10/22/2002 |
| 6359128 | Free-flowing flakes of vinyl caprolactam monomer and process for making same Free-flowing flakes of vinyl caprolactam monomer usable below its melting point of 34° C. without developing coloration.... | 03/19/2002 |
| 6333411 | Method for production of hydroxylammonium phosphate in the synthesis of caprolactam A method for production of caprolactam. The method involves: (a) reacting air with ammonia gas in an ammonia conversion zone to produce nitric oxide; (b) oxidizing at least a portion of the nitric oxide to nitrogen dioxide to produce an NOx -rich pr... | 12/25/2001 |
| 6252065 | Process for the preparation of lactams from the corresponding cycloalkanone oximes For the preparation of lactams comprising 6 to 12 carbon atoms from the corresponding cycloalkanone oximes by rearrangement according to the Beckmann reaction in the presence of acid, the process is characterized in that use is made of methanesulphonic ac... | 06/26/2001 |
| 6245907 | Process for producing a high purity caprolactam Disclosed is a process for producing a high purity caprolactam which comprises converting cyclohexene obtained by the partial hydrogenation of benzene into cyclohexanol through hydration, converting the cyclohexanol into cyclohexanone through dehydrogenat... | 06/12/2001 |
| 5900482 | Process for the preparation of &3xb5;-caprolactam The present invention provides a method for producing &3xb5;-caprolactam, which comprises subjecting cyclohexene to a hydration reaction to obtain cyclohexanol, subjecting the cyclohexanol to a dehydrogenation reaction to obtain cyclohexanone, subjecting ... | 05/04/1999 |
| 5594137 | Process for the preparation of caprolactam A process for the preparation of caprolactam by reacting cyclohexanone oxime with a cationic or nonionic surfactant and a cosurfactant in dilute sulfuric acid at a temperature in the range of 15° C. to 40° C., neutralizing excess acid present in the sol... | 01/14/1997 |
| 5502184 | Process for producing &3xb5; -caprolactam The invention provides a process for producing high quality &3xb5;-caprolactam which comprises allowing crude &3xb5;-caprolactam obtained by gas phase Beckmann rearrangement of cyclohexanone oxime to contact with hydrogen at 100°-200° C. in the presence... | 03/26/1996 |
| 5455346 | Obtaining caprolactam by cleavage of molten polycaprolactam Caprolactam is obtained from mixtures which contain polymers or thermoplastic molding materials having the repeating unit --N(H)--(CH2)5 --C(O)-- (a) by cleavage at elevated temperatures in the presence of a base under reduced pressure or... | 10/03/1995 |
| 5440032 | Method for purifying organic solution containing lactams Disclosed is a method for purifying a lactam-containing organic solution which comprises processing an organic solution containing at least one lactam with an anion exchange resin to remove an anionic surface active substance contained in said organic sol... | 08/08/1995 |
| 5401843 | Process for the preparation of caprolactam A process for the preparation of caprolactam by reacting cyclohexanone oxime with an anionic surfactant and a cosurfactant in dilute sulfuric acid at a temperature in the range of 15° C. to 40° C., neutralising excess acid present in the solution and fr... | 03/28/1995 |
| 5362870 | Process for producing a high purity caprolactam A process for producing a high purity caprolactam is disclosed in which a crude caprolactam obtained by a catalytic rearrangement of cyclohexanone oxime is subjected (1) to mixing, while stirring, with at least one hydrocarbon selected from the group cons... | 11/08/1994 |
| 5354859 | &3xb5;-caprolactam &3xb5;-Caprolactam is prepared by bringing cyclohexanone oxime into contact in gas phase with solid catalysts such as a zeolite catalyst in the presence of at least one nitrogen-containing compound selected from the group consisting of ammonia, methylamin... | 10/11/1994 |
| 5304643 | Process for producing epsilon-caprolactam &3xb5;-Caprolactam is prepared by subjecting cyclohexanone oxime in a gas phase to a catalytic reaction using zeolite catalysts in the presence of water and at least one compound selected from alcohols and ether compounds.... | 04/19/1994 |
| 5264571 | Preparation of caprolactam by Beckmann rearrangement of cyclohexanone oxime A process for preparing caprolactam by Beckmann rearrangement of cyclohexanone oxime with oleum at from 85° to 125° C. in a plurality of rearrangement stages arranged in series entails returning a portion of the reaction mixture leaving the last rearran... | 11/23/1993 |
| 5254684 | Process for producing amide by liquid phase rearrangement of oxime A process for producing an amide which comprises subjecting an oxime to liquid phase rearrangement in the presence of phosphorus pentoxide and at least one compound selected from the group consisting of N,N-dialkyl amides, N-alkyl cyclic amides and dialky... | 10/19/1993 |
| 5227482 | Method for producing a lactam A method for preparing a lactam, which comprises subjecting a cycloalkanone oxime to a Beckmann rearrangement reaction in a gas phase in the presence of a carrier-supported catalyst containing tantalum, wherein the carrier-supported catalyst is the one pr... | 07/13/1993 |
| 5225547 | Reaction accelerator for rearrangement of oxime to amide and process for producing amides by rearrangement of oximes A reaction accelerator for rearrangement of an oxime to an amide consisting of an alkylating agent and an N,N-disubstituted formamide or N,N-disubstituted carboxylic acid amide represented by formula (1): ##STR1## wherein R1 and R2 | 07/06/1993 |
| 4927924 | Synthesis of caprolactam A process is provided for catalytically converting cyclohexanone oxime to epsilon caprolactam. The conversion is characterized by exceptionally high selectivity and reduced rate of catalyst aging, even at single pass conversion above 90 percent. The conve... | 05/22/1990 |
| 4883915 | Catalyzed oxime conversions A process for the catalyzed conversion fo oximes such as cyclohexanone oxime to amides such as caprolactam via a high conversion, high selectivity, long catalyst lifetime reaction over a HAMS-1B crystalline borosilicate-based catalyst composition.... | 11/28/1989 |
| 4873325 | Process for the production of amides Oximes can be converted to the corresponding amides by contacting the oximes with a non-zeolitic molecular sieve, which has in its calcined form an adsorption of isobutane of at least about 2 percent by weight of the non-zeolitic molecular sieve at a part... | 10/10/1989 |
| 4789741 | Process for the synthesis of epsilon-caprolactam The invention concerns a two-step process for the synthesis of caprolactam by reaction of cylcohexanone-oxime with an excess of oleum, carried out in a first step with only a portion of the oxime and in the presence of liquid SO2, according to ... | 12/06/1988 |
| 4717770 | Process for producing epsilon-caprolactam &3xb5;-caprolactam is prepared by gas phase catalytic synthesis where cyclohexanone oxime is brought into contact with a crystalline zeolite, for example, aluminosilicate zeolite or metallosilicate zeolite having a constraint index of 1-12 which has been ... | 01/05/1988 |
| 4717769 | Production of epsilon-caprolactam &3xb5;-caprolactam is produced by gas phase catalytic synthesis with high selectivity of lactam wherein cyclohexanone oxime is brought into contact with a crystalline metallo-silicate catalyst having Si/metal atomic ratio is more than 500. The metal moiet... | 01/05/1988 |
| 4709024 | Production of epsilon-caprolactam &3xb5;-caprolactam is prepared by gas phase catalytic synthesis in which cyclohexanone oxime is brought into contact with crystalline alluminosilicate, for example, ZSM-5 H+ form) having 1-12 of constraint index, 500 or more, preferably 1000 or... | 11/24/1987 |
| 4697010 | Catalyzed oxime conversions A process for the catalyzed conversion of oximes such as cyclohexanone oxime to amides such as caprolactam via a high conversion, high selectivity, long catalyst lifetime reaction over a HAMS-1B crystalline borosilicate-based catalyst composition.... | 09/29/1987 |
| 4689412 | Method for preparing lactams having 8 to 15 carbon atoms from the corresponding oximes The present invention is a process for preparing lactams having 8 to 15 carbon atoms by the Beckmann rearrangement of the corresponding oximes in a solution of an organic solvent by means of 0.5 to 10% by weight referred to the oxime of an acid derivative... | 08/25/1987 |
| 4359421 | Process for making epsilon-caprolactam Process for preparing caprolactam from cyclohexanone oxime by passing the oxime, preferably dissolved in a solvent, over a zeolite having a SiO2 /Al2 O3 of at least 12 and a Constraint Index of from 1 to 12.... | 11/16/1982 |
