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| Number | Title | Issue Date |
| 7384518 | Method for purifying lactams A method and a plant are disclosed for purifying lactams, particularly lactams obtained by cyclizing hydrolysis of aminonitrile. The purification of ε-caprolactam obtained by cyclizing hydrolysis of aminocapronitrile is described which includes eliminating the ammo... | 06/10/2008 |
| 7132538 | Isolation of high-purity triethylenediamine (TEDA) by distillation Process for purifying triethylenediamine (TEDA) by disillation, in which the fractionation is carried out in a dividing wall column. ... | 11/07/2006 |
| 7115688 | Nanoparticles with polymer shells The invention provides a method of preparing nanoparticles having at least one polymer shell attached to them, each polymer shell having a selected property or properties. The method comprises attaching initiation monomers to the surfaces of the nanoparticles, conta... | 10/03/2006 |
| 7094898 | Ruthenium compounds, their production and use A new class of compounds is disclosed that in preferred embodiments relate to Ru-based catalysts suitable for use in olefin metathesis reactions. Such compounds demonstrate high rates of catalytic turnover in comparison with other Ru catalysts known in the art. More... | 08/22/2006 |
| 7026473 | Process for the carbonylation of pentenenitrile Processes to prepare 5-cyanovaleric acid or its ester are provided, by carbonylation of a pentenenitrile, wherein pentenenitrile is reacted with carbon monoxide and water and/or an alcohol in the presence of a catalyst system. The catalyst system contains: ... | 04/11/2006 |
| 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 |
| 6972075 | Method for removing 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine The invention relates to a method for removing, by distillation, 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine, by a) removing the hexamethylenediamine from the mixture while obtaining a mixture (I) that ... | 12/06/2005 |
| 6841709 | Method of cutting polymer chains and method for producing chemical raw materials The present invention is to provide a technology to establish a new cycle-based organic chemical industry, which may be called a polymer cascade (polymer reflux industry) wherein the polymer substances shall not remain the final products, but still give birth to syn... | 01/11/2005 |
| 6838577 | Processes for the manufacture of lactones Processes are disclosed for the manufacture of lactones, e.g., caprolactone, from hydoxy acids, e.g., 6-hydroxycaproic acid. The reaction is conducted over a suitable catalyst in the presence of water. ... | 01/04/2005 |
| 6828413 | Process for the preparation of a polyamide The invention relates to a process for the preparation of a polyamide comprising at least a step in which a composition that comprises at least (a) a primary aminocarbonamide and (b) an aminocarboxylic acid and/or a lactam is polymerised, said composition comprising... | 12/07/2004 |
| 6660857 | Process for the preparation of &3xb5;-caprolactam A process for the preparation of &3xb5;-caprolactam starting from 6-aminocaproic acid, 6-aminocaproamide, 6-aminocaproic ester, 6-aminocapronitrile, oligomers or polymers of these compounds or mixtures comprising at least two of these compounds, which pro... | 12/09/2003 |
| 6632964 | Process for production of aliphatic aldehyde-acid and/or aliphatic dicarboxylic acid and catalyst for the production A process of producing an aliphatic aldehyde-acid (e.g., adipaldehyde-acid) and/or an aliphatic dicarboxylic acid (e.g., adipic acid) comprising oxidizing a cyclic ketone (e.g., cyclohexanone) with molecular oxygen in the presence of a fixed catalyst whic... | 10/14/2003 |
| 6521752 | Process to separate linear alkyl 5-formylvalerate The invention relates to a process to separate linear 5-formylvalerate compound from a crude mixture comprising 5-formylvalerate compound and 2-, 3- and/or 4-formylvalerate compound by vacuum distillation, wherein the distillation is performed in the pres... | 02/18/2003 |
| 6452002 | Process to continuously prepare an aqueous mixture of &3xb5;-caprolactam and &3xb5;-caprolactam precursors Process for preparing an aqueous mixture of &3xb5;-caprolactam and 6-aminocaproic acid and/or 6-aminocaproamide which involves, as the reductive amination step, contacting 5-formylvaleric acid and/or an alkyl 5-formylvalerate in water as solvent with hydr... | 09/17/2002 |
| 6392037 | Process for the preparation of &3xb5;-caprolactam Process for the preparation of &3xb5;-caprolactam comprising treating 6-aminocaproic acid 6-aminocaproate ester, 6-aminocaproamide, oligomers or polymers of these compounds or mixtures comprising at least two of these compounds in a cyclisation reactor in... | 05/21/2002 |
| 6362332 | Coproduction of a cyclic lactam and a cyclic amine A cyclic lactam and a cyclic amine are coproduced by reacting an aliphatic alpha, omega-diamine with water in the gas phase in the presence of a heterogeneous catalyst.... | 03/26/2002 |
| 6353100 | Process for the preparation of &3xb5;-caprolactam Process for the preparation of &3xb5;-caprolactam, in which in a step (a) a compound with the general formula: O=CH--(CH2)4 --C(O)--R (1) in which R is --OH, --NH2 or O--R', in which R' is an organic group with 1 to 10 carbon ... | 03/05/2002 |
| 6333412 | Process for the preparation of &3xb5;-caprolactam Process to prepare &3xb5;-caprolactam starting from a starting mixture containing a 6-aminocaproate ester, in which in a first step (1) the 6-aminocaproate ester is converted into 6-aminocaproic acid and 6-aminocaproamide by reaction with water in the pre... | 12/25/2001 |
| 6331624 | Process for preparing 6-aminocaproamide A process for the production of 6-aminocaproamide comprising reacting 5-cyanovaleramide with hydrogen in the presence of a metal catalyst. The 6-aminocaproamide is useful, for example, in the production of caprolactam and nylon 6.... | 12/18/2001 |
| 6303837 | Process for synthesizing -substituted ring systems Using the process according to the invention, it is possible to provide, with few reaction steps, a novel route to -substituted ring systems, which optionally have further substituents.... | 10/16/2001 |
| 6300496 | Processes for producing epsilon caprolactams This invention relates in part to processes for producing one or more substituted or unsubstituted epsilon caprolactams, e.g., epsilon caprolactam, which comprise (a) converting one or more substituted or unsubstituted hydroxyaldehydes, e.g., 6-hydroxyhex... | 10/09/2001 |
| 6268530 | Process to prepare 5-formylvaleric acid Process to separate linear 5-formylvaleric acid from a mixture of 5- and 3- and 4-formylvaleric acids, wherein the separation is performed by fractional extraction with two immiscible solvents of which one solvent is an aqueous solvent and the other solve... | 07/31/2001 |
| 6204379 | Preparation of caprolactam The present invention concerns the aminomethylation of pentenoic acid derivatives, by reaction with carbon monoxide, hydrogen and ammonia, for preparing caprolactam. More precisely, it is directed to a method for preparing caprolactam wherein the aminomet... | 03/20/2001 |
| 6194572 | Process to prepare &3xb5;-caprolactam Process to prepare &3xb5;-caprolactam by treating 6-aminocaproic acid, 6-aminocaproate ester or 6-aminocaproamide or mixtures comprising at least two of these compounds in the presence of superheated steam in which a gaseous mixture comprising &3xb5;-capr... | 02/27/2001 |
| 6147208 | Process for simultaneously preparing caprolactam and hexamethylene diamine Caprolactam and hexamethylenediamine are prepared simultaneously starting from adiponitrile.... | 11/14/2000 |
| 6013816 | Process for the preparation of a linear formyl compound Process for the preparation of a linear ω-formyl-carboxylic acid or a corresponding linear formylnitrile compound starting from an internally unsaturated C4 -C12 carboxylic acid or a corresponding ester or nitrile by means of hydrof... | 01/11/2000 |
| 6011153 | Process for the preparation of a mixture of &3xb5;-caprolactam, 6-aminocaproic acid and 6-aminocaproic amide Process for the preparation of a mixture of &3xb5;-caprolactam, 6-aminocaproic acid and 6-aminocaproic amide by heating an aqueous mixture containing ammonia and oligomers of 6-aminocaproic acid and/or of 6-aminocaproic amide, the aqueous mixture containi... | 01/04/2000 |
| 5977356 | Process for preparing caprolactam A simple and single step process for producing caprolactam comprising reacting 5-formylvaleric acid or an ester thereof in a solvent of water and/or an alcohol with hydrogen and ammonia in the presence of a noble metal catalyst supported by a carrier at 8... | 11/02/1999 |
| 5973143 | Process to prepare &3xb5;-caprolactam from 6-aminocaproic acid Process to prepare &3xb5;-caprolactam starting from a liquid aqueous mixture containing an alcohol and 6-aminocaproic acid by cyclization of 6-aminocaproic acid in the aqueous mixture at an elevated temperature. The alcohol is separated from the starting ... | 10/26/1999 |
| 5962680 | Processes for producing epsilon caprolactams This invention relates in part to processes for producing one or more substituted or unsubstituted epsilon caprolactams, e.g., epsilon caprolactam, which comprises: (a) subjecting one or more substituted or unsubstituted alkadienes to hydroxycarbonylation... | 10/05/1999 |
| 5922863 | Diene cyclization using ruthenium and osmium carbene complexes Disclosed are ruthenium and osmium carbene compounds which are stable in the presence of a variety of functional groups and which can be used to catalyze olefin metathesis reactions on unstrained cyclic and acyclic olefins. Specifically, the present inven... | 07/13/1999 |
| 5877314 | Process to continuously prepare an aqueous mixture of episilon caprolactum and episilon caprolactum precursors This continuous process for preparing an aqueous mixture of .di-elect cons.-caprolactam and 6-aminocaproic acid and/or 6-aminocaproamide by involves, as the reductive amination step, continuously contacting 5-formylvaleric acid or an alkyl 5-formylvalerat... | 03/02/1999 |
| 5780623 | Process to prepare &3xb5;-caprolactam from 6-aminocaproic acid Process to prepare &3xb5;-caprolactam starting from a liquid aqueous mixture containing an alcohol and 6-aminocaproic acid by cyclization of 6-aminocaproic acid in the aqueous mixture at an elevated temperature. The alcohol is separated from the starting ... | 07/14/1998 |
| 5717089 | Process for the preparation of E-caprolactam Process for the preparation of &3xb5;-caprolactam starting from an aldehyde compound comprising at least one member from among 5-formylvaleric acid, ester or amide in which the aldehyde compound is allowed to react in the presence of ammonia and hydrogen ... | 02/10/1998 |
| 5717090 | Simultaneous preparation of caprolactam and hexamethylenediamine Caprolactam and hexamethylenediamine are prepared simultaneously starting from adiponitrile by a process in which (a) adiponitrile is partially hydrogenated to give a mixture containing essentially 6-aminocapronitrile, hexamethylenediamine, ammonia, adipo... | 02/10/1998 |
| 5700934 | Process for the preparation of epsilon-caprolactam and epsilon-caprolactam precursors A process for the preparation of &3xb5;-caprolactam and &3xb5;-caprolactam precursors, starting from the corresponding 5-formylvalerate ester, ammonia and hydrogen in the presence of a hydrogenation catalyst is disclosed, wherein in a step (a) 5-form... | 12/23/1997 |
| 5652362 | Preparation of caprolactam A method of making caprolactam from aminohexanoic acid or aminohexanoate ester comprising the steps of: (a) obtaining a reactor containing at least one catalyst, the catalyst being a metal oxide having acid-base-paired active sites; (b) charging a reactio... | 07/29/1997 |
| 5502185 | Preparation of lactams Cyclic lactams are prepared by reacting an aminocarboxylic acid compound of the formula I H2 N--(CH2)m --COR1 I where R1 is --OH, --O--C1 -C12 -alkyl or --NR2... | 03/26/1996 |
| 5495014 | Preparation of caprolactam Caprolactam is prepared by cleaving oligomers or polymers containing essentially the repeating unit --[--N(H)-(CH2)5 --C(O)--]- in the presence of a catalyst at elevated temperatures by a process in which the cleavage is carried out ... | 02/27/1996 |
| 5395974 | Lewis acid catalyzed ammonolysis of nylon The present invention relates to a method of reacting polyamides or mixtures thereof with ammonia to obtain a mixture of monomers. The reaction is carried out in the presence of certain Lewis Acid catalyst precursors.... | 03/07/1995 |
