Patents in Class 540/538

Matches 1 - 50 out of 57

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Match	Document	Document Title
1	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...
2	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...
3	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...
4	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...
5	6660857	Process for the preparation of &egr -caprolactam A process for the preparation of ε-caprolactam starting from 6-aminocaproic acid, 6-aminocaproamide, 6-aminocaproic ester, 6-aminocapronitrile, oligomers or polymers of these compounds or mixtures...
6	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...
7	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...
8	6452002	Process to continuously prepare an aqueous mixture of &egr -caprolactam and &egr -caprolactam precursors Process for preparing an aqueous mixture of ε-caprolactam and 6-aminocaproic acid and/or 6-aminocaproamide which involves, as the reductive amination step, contacting 5-formylvaleric acid and/or...
9	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.
10	6353100	Process for the preparation of &egr -caprolactam Process for the preparation of ε-caprolactam, in which in a step (a) a compound with the general formula: O=CH—(CH 2 ) 4 —C(O)—R ( 1 ) in which R is —OH, —NH 2 or O—R′, in which...
11	6333412	Process for the preparation of ε-caprolactam Process to prepare ε-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...
12	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...
13	6303837	Process for synthesizing α-substituted ring systems Using the process according to the invention, it is possible to provide, with few reaction steps, a novel route to α-substituted ring systems, which optionally have further substituents.
14	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...
15	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...
16	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...
17	6194572	Process to prepare ε-caprolactam Process to prepare ε-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...
18	6147208	Process for simultaneously preparing caprolactam and hexamethylene diamine Caprolactam and hexamethylenediamine are prepared simultaneously starting from adiponitrile.
19	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 C 4 -C 12 carboxylic acid or a...
20	6011153	Process for the preparation of a mixture of ε-caprolactam, 6-aminocaproic acid and 6-aminocaproic amide Process for the preparation of a mixture of ε-caprolactam, 6-aminocaproic acid and 6-aminocaproic amide by heating an aqueous mixture containing ammonia and oligomers of 6-aminocaproic acid and/or...
21	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...
22	5973143	Process to prepare ε-caprolactam from 6-aminocaproic acid Process to prepare ε-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...
23	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...
24	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...
25	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...
26	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...
27	5717089	Process for the preparation of E-caprolactam Process for the preparation of ε-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...
28	5700934	Process for the preparation of epsilon-caprolactam and epsilon-caprolactam precursors A process for the preparation of ε-caprolactam and ε-caprolactam precursors, starting from the corresponding 5-formylvalerate ester, ammonia and hydrogen in the presence of a hydrogenation...
29	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...
30	5502185	Preparation of lactams Cyclic lactams are prepared by reacting an aminocarboxylic acid compound of the formula I H 2 N--(CH 2 ) m --COR 1 I where R 1 is --OH, --O--C 1 -C 12 -alkyl or --NR 2 R...
31	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...
32	5310905	Conversion of nylon 6 and/or nylon 6,6 to monomers Waste nylon 6 and/or nylon 6,6 are treated with aliphatic monocarboxylic acid to depolymerize the polymer to desirable monomer.
33	5302756	Ammonolysis of nylon Useful monomeric products are obtained in the reaction of nylon 6,6 with ammonia. Increased yield of monomer products from nylon 6,6 is obtained from ammonolysis when a mixture with nylon 6 is...
34	5276165	Preparation of N-substituted lactams A process for the preparation of N-substituted lactams of the formula I ##STR1## where Z is C 2 - to C 10 -alkylene, C 7 - to C 12 -aralkylene, phenylene or naphthylene, and R 1 is C 1 -...
35	4963673	Preparation of caprolactam Caprolactam is prepared by heating a 6-aminocaproic ester in liquid phase in the presence of water to 230°-350° C. under superatmospheric pressure in a reaction medium comprising a liquid...
36	4873326	Process for the preparation of N-alkylated caprolactams This invention relates to a process for the preparation of N-alkylated caprolactams by the cyclization of N-alkylated caproic acids.
37	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...
38	4870173	Lactam formation by a selective cyclization process This invention provides a process for preparing lactams, by selectively reacting a novel 1-hydrocarbyl-amino (or heteroatom-substituted hydrocarbylamino); 1,1-dicarboxylic acid, alkylesters;...
39	4800227	Process for the production of lactams A one-step method for the reductive amination of a heterocyclic to produce a nitrogen-containing heterocyclic. The feedstock is contacted with a mixed metal catalyst in which the metal comprises...
40	4731445	Preparation of epsilon-caprolactam Caprolactam is prepared by a process in which (a) the 5-formylvalerate is reacted with excess ammonia and hydrogen in the presence of an alkanol as the solvent and in the presence of a...
41	4730041	Preparation of ε-caprolactams Caprolactam is prepared by a process in which (a) a 5-formylvalerate is reacted with excess ammonia and hydrogen in the presence of an alkanol as a solvent and in the presence of a hydrogenation...
42	4730040	Preparation of caprolactam ε-caprolactam is prepared by a process in which (a) a 5-formylvalerate is reacted with water in the presence of an acidic agent at from 30° to 200° C., (b) the 5-formylvaleric acid thus...
43	4605762	Depolymerization of condensation polymers A process for the neutral hydrolytic depolymerization of condensation polymers is described. The process is conducted in a continuous manner and comprises introducing condensation polymer waste...
44	4599199	Obtaining caprolactam from epsilon-aminocaproic acid Caprolactam is obtained by treating ε-aminocaproic acid with steam at elevated temperatures in the presence of a catalyst by a process in whcih ε-aminocaproic acid is introduced into a fluidized...
45	4329498	Preparation of 6-aminocaproic acid via muconic acid mononitrile Phenol, catechol and orthobenzoquinone are converted to muconic acid mononitrile by reaction with a copper(II)-ammonia reagent. The copper(II)-ammonia reagents can be prepared by the reaction of...
46	3988319	Process for producing caprolactam from 6-aminocaproic acid Caprolactam is obtained in high yield and in short reaction time by completely dissolving 6-aminocaproic acid in methanol or ethanol and heating the solution at 170°-200° C.
47	3857510	KETONE CLEAVAGE AND PRODUCTS THEREFROM A method of cleaving ketones at a carbon-carbon bond adjacent to the ketonic carbon to produce a terminal carboxylic ester and a terminal oxime group, which comprises, nitrosating the ketone in the...
48	3485821	PROCESS FOR PREPARING CAPROLACTAM AND ITS ALKYL SUBSTITUTED DERIVATIVES
49	3360514	Process for preparing epsiloncaprolactams
50	3337585	Process for making pyrrolidones and piperidones

Matches 1 - 50 out of 57

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