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JP3352654B2 |
The use of methanesulfonic acid as a replacement for sulfuric acid in both stages overcomes oxime deposition problems and side reactions. The preparation of lauryl lactam comprises: (a) A photochemical reaction of cyclododecane, dissolve...
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JP2002234870A |
To provide a method for producing an amide compound in high yield by a Beckmann rearrangement of an oxime compound in a liquid phase under a mild reaction condition.This method for producing an amide compound such as - caprolactam from a...
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JP2002526473A |
A cyclic lactam and a cyclic amine are coproduced by coreacting an aliphatic alpha, omega-diamine and an aliphatic alpha, omega-aminonitrile with water in the gas phase in the presence of a heterogeneous catalyst.
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JP2002526479A |
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.
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JP2002226459A |
To provide a method for producing a lactam in high selectivity from the corresponding cyclic ketone.This method for producing a lactam comprises reaction of the corresponding cyclic ketone with a nitrogen source and oxygen in the presenc...
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JP2002524441A |
Process for preparing an aqueous mixture of epsilon -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 ...
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JP2002193927A |
To provide the synthetic method of a lactam in the presence of high- temperature and high-pressure water, and a manufacturing method of the lactam.This synthetic method of the lactam is characterized in that the lactam is synthesized by ...
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JP2002193928A |
To manufacture a high-quality -caprolactam stably for long period in high yield without the accumulation of impurities in a system.A mixture containing the impurities as a main component and the -caprolactam, which is produced as a by-pr...
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JP3298372B2 |
PURPOSE: To obtain in high purity a lactam as a raw material for synthesis or an industrial raw material for polyamide fibers, etc., by irradiating a lactam containing ultraviolet-absorbing impurities with ultraviolet rays to decompose t...
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JP2002518372A |
(57) [Summary] The present invention is one or more selected from the group consisting of ε-caprolactam and 4-ethyl-2-pyrrolidinone, 5-methyl-2-piperidinone, 3-ethyl-2-pyrrolidinone and 3-methyl-2-piperidinone. In separating ε-caprolac...
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JP3285582B2 |
A process is disclosed for simultaneously depolymerizing nylon 6 and nylon 6,6 and reclaiming the monomer values by steam distillation.
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JP2002145863A |
To improve bad conditions such as scaling on a distillation column, loss of -caprolactam by heat deterioration, etc., caused by an alkali added when crude -caprolactam is purified by distillation.This method for purifying -caprolactam is...
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JP2002145854A |
To provide a method for producing amides, suitable for industrial operation.This method for producing the amide compound is characterized in that when forming the amide compound by the rearrangement of an oxime compound in the presence o...
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JP2002121187A |
To provide a method for preventing the deterioration of the catalyst, the solvent and the objective amide compound under the conditions of heating during reaction, and after reaction for separating the product or the like, and for manufa...
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JP2002121183A |
To improve a method for closing a ring of an amino acid for producing a ring closure compound used for an intermediate for producing a medicine or a reagent intermediate from the amino acid, improving the yield and purity of the product,...
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JP2002105039A |
To provide a method for evaporating cyclohexanone oxime so as to diminish byproduct formation, and to provide an evaporator to be used for the method.This method for evaporating cyclohexanone oxime comprises the following practice: a mix...
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JP2002510670A |
The present invention relates to processes for the production of alpha -aryl- beta -ketonitriles, which serve as synthetic intermediates in the preparation of a series of biologically important molecules such as corticotropin releasing f...
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JP3269588B2 |
PURPOSE: To provide a method for recovering monomeric caprolactam of improved quality from polycaprolactam by hydrolysis capable of refeeding to a refining stage at the time of producing caprolactam without causing problems. CONSTITUTION...
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JP2002507597A |
The invention relates to a process for the continuous purification of crude epsilon -caprolactam, wherein crude epsilon -caprolactam prepared by cyclization of alkyl 6-aminocaproate, 6-aminocapronitrile, 6-amino caproic acid, 6-aminocapr...
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JP2002506853A |
A process for preparing lactams by hydrolytic cyclization of aminonitriles in the gas phase in the presence of a metal phosphate catalyst comprises using a catalyst comprising one or more oligophosphates of the general formula (I)where M...
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JP3254744B2 |
PURPOSE: To separate octahydrophenazine and readily and efficiently produce high-grade caprolactam by distilling crude caprolactam in the presence of amines. CONSTITUTION: The method for separating octahydrophenazine from a crude caprola...
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JP3254751B2 |
PURPOSE: To obtain the subject compound in extremely high selectivity by reacting cyclohexanone oxime with a solid catalyst in vapor phase in the presence of ammonia. CONSTITUTION: Cyclohexanone oxime is made to contact with a solid cata...
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JP3255002B2 |
To provide a method for producing ε-caprolactam from cyclohexanone oxime by a gaseous phase reaction, capable of producing the ε-caprolactam in high conversion and in high selectivity by using a zeolite catalyst capable of being easily...
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JP3254753B2 |
PURPOSE: To obtain a method for producing ε-caprolactam in extremely high selectivity in a state capable of reacting with cyclohexanone oxime also in high conversion and remarkably improved in the life of a catalyst. CONSTITUTION: The o...
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JP3254752B2 |
PURPOSE: To provide a process for producing ε-caprolactam in improved life of catalyst and yield of ε-caprolactam. CONSTITUTION: ε-Caprolactam is produced by the catalytic reaction of cyclohexanone oxime in vapor phase using a zeolite...
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JP2002503718A |
Process to prepare epsilon -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 w...
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JP3253306B2 |
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 wh...
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JP2002502365A |
This invention relates in part to processes for producing one or more substituted or unsubstituted hydroxyaldehydes, e.g., 6-hydroxyhexanals, which comprise subjecting one or more substituted or unsubstituted alkadienes, e.g., butadiene,...
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JP2002003470A |
To efficiently obtain a lactam from a corresponding cycloalkane.This method for producing a lactam comprises reacting a cycloalkane with a nitrogen oxide in the presence of an N-substituted cyclic imide-based catalyst and a halogen or Be...
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JP2002003471A |
To provide a method for producing a lactam from a cyclic ketone in high selectivity.This method for producing a lactam by reacting a cyclic ketone with a nitrogen source and oxygen in the presence of an oxide catalyst, is characterized b...
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JP2002500620A |
This invention relates in part to processes for producing one or more substituted or unsubstituted hydroxyaldehydes, e.g., 6-hydroxyhexanals, which comprise subjecting one or more substituted or unsubstituted alkadienes, e.g., butadiene,...
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JP2001354646A |
To provide a pyrrolidone composition containing few kinds of impurities deteriorating the quality such as hue of the composition.The pyrrolidone composition is produced by reacting a compound selected from ammonia, primary amine, seconda...
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JP2001354645A |
To provide a method for continuously producing amide compounds in high yield while preventing the change in properties of catalyst, solvent or objective amide compound under the heating condition during the reaction or the separation, et...
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JP2001526652A |
The disclosure is a process for preparing cyclic lactams of the formula I:whereR1 is hydrogen, alkyl, cycloalkyl or aryl, andA is C3-C12-alkylene unsubstituted or substituted by 1, 2, 3, 4, 5 or 6 substituents selected independently of o...
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JP2001342174A |
To provide an industrially advantageous method for producing an amide compound by a rearrangement of an oxime compound by which the selectivity for the objective amide compound is extremely improved and further the reaction rate is impro...
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JP2001342110A |
To obtain a skin care preparation which shows ameliorated bleaching effect or darkening prophylactic effect to the skin and exhibits excellent stability or safety as a cosmetic preparation.This skin care preparation is obtained by includ...
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JP2001524541A |
The invention relates to a process for preparing lactams by cyclizing hydrolysis of amino nitriles with water in the gas phase on catalysts which comprise oxides or mixed oxides of the metals of groups 3, 4, 5, 13 and/or 14 of the Period...
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JP2001335561A |
To provide a method for producing a lactam from a cyclic ketone with high selectivity.This method for producing the lactam by reacting the cyclic ketone with a nitrogen source and oxygen in the presence of an oxide catalyst is characteri...
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JP2001316359A |
To provide a method for producing a lactam in high selectivity from a cyclic ketone.This method for producing a lactam by reacting a cyclic ketone with a nitrogen source and oxygen in the presence of an oxide catalyst is characterized in...
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JP2001522371A |
The invention relates to a process for recovering caprolactam from a neutralized rearrangement mixture, which rearrangement mixture comprises a solution of caprolactam in water and a solution of ammonium sulphate in water, by extraction ...
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JP2001521569A |
This invention relates to a composition comprising (a) epsilon caprolactam and (b) one or more of 5-[4,5-di(3-carboxypropyl)-2-pyridyl]pentanoic acid or salt or amide, 4-[4,5-di(2-carboxypropyl)-2-pyridyl]-2-methylbutanoic acid or salt o...
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JP2001521484A |
The present invention provides novel indane-like compounds which can be useful for treating psychosis and other conditions associated with the modulation of a muscarinic receptor. The invention provides formulations and methods for using...
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JP2001521526A |
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 hy...
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JP2001302602A |
To provide a method for producing an amide compound in high efficiency by Beckmann rearrangement of an oxime compound in a liquid phase, under a mild reaction condition and in the presence of a small amount of acid catalyst. This method ...
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JP2001302626A |
To provide a method capable of manufacturing a pyrrolidone having a very small content of basic impurities and super high purity. The method for manufacturing a pyrrolidone by reacting γ- butyrolactone with an amine in the presence of w...
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JP2001302624A |
To provide a method for manufacturing a lactam in high selectivity from a cyclic ketone. A method for manufacturing a lactam by reacting a cyclic ketone with a nitrogen source and oxygen in the presence of an oxide catalyst (a catalyst c...
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JP2001302603A |
To provide a method for producing an amide compound in high efficiency by Beckmann rearrangement of an oxime compound in a liquid phase, under a mild reaction condition and without using an expensive fluorine- containing strong acid comp...
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JP3224412B2 |
PURPOSE: To obtain the subject compound useful as an intermediate for producing penem compounds without employing a toxic mercury compound in a short process by reacting an azetidinone derivative with a thiocarboxylic acid in the presenc...
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JP2001294571A |
To provide a recycle process for efficiently recovering used - caprolactam from nylon 6 waste including non-melting substances. An acidic substance is added to the nylon 6 waste in an amount of ≤15 pts.wt. per 100 pts.wt. of polycaprol...
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JP3221063B2 |
PURPOSE: To readily and efficiently produce high-grade caprolactam by distilling crude caprolactam in the coexistence of aliphatic saturated hydrocarbons. CONSTITUTION: The method for purifying caprolactam is characterized by distilling ...
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