Abstract:
Laurolactam having high quality is produced by reacting cyclododecanone with a hydroxylamine salt of a mineral acid, and converting the resultant cyclododecanoneoxime to laurolactam through the Beckmann rearrangement reaction, wherein a content of each of oxygen atom-containing C 12 organic compounds, for example, cyclododecenone or epoxycyclododecane, and cycloaliphatic unsaturated C 12 hydrocarbon compounds, contained, as an impurity, in the staring cyclododecanone material, is controlled to 1,000 ppm or less.
Abstract:
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 produce an NO x -rich process gas stream; (c) reacting the NO x -rich stream with ammonium carbonate in a nitriting zone to produce ammonium nitrite; (d) reducing the ammonium nitrite to hydroxylamine diammonium sulfate; (e) hydrolyzing the hydroxylamine diammonium sulfate to hydroxylamine sulfate; (f) oximating the hydroxylamine sulfate with cyclohexanone to produce cyclohexanone oxime; and (g) converting the cyclohexanone oxime to caprolactam. The process is improved by adding supplemental oxygen downstream of the ammonia conversion zone to increase the quantity and rate of formation of nitrogen dioxide in the NO x -rich process gas stream.
Abstract:
The present invention relates to a process for the preparation of (3-cyano-1H-indol-7-yl)[4-(4-fluorophenethyl)piperazin-1-yl]-methanone and salts thereof, characterised in that an indole ester of the formula II in which R is as defined in Claim 1, is converter into 3-cyano-1H-indole-7-carboxylic acid via steps (1) to (4) according to Claim 1, and this is reacted with 1-[2-(4-fluorophenyl)ethyl]piperazine of salts thereof to give the product.
Abstract:
The invention relates to a method for the preparation of cyclohexanone from cyclohexane. The invention relates more particularly to a method for the production of cyclohexane whose impurity content enables cyclohexanone to be used as a raw material for the production of e-caprolactam. The inventive method consists in treating the mixture of cyclohexanol/cyclohexanone arising from oxidation of cyclohexane by oxygen in a dehydrogenation stage in order to transform cyclohexanol into cyclohexanone and the impurities present such as cyclopentenal. The inventive method makes it possible to obtain highly pure cyclohexanone which is compatible when used as a raw material in the synthesis of e-caprolactam.
Abstract:
본 발명은 특허청구범위 제 1항에 따른 단계 (1) 내지 (4)를 통해, R이 특허청구범위 제 1항에서 정의한 바와 같은 화학식 Ⅱ의 인돌 에스테르를 3-시아노-1H-인돌-7-카르복실산으로 전환하고, 이를 이의 염의 1-[2-(4-플루오로페닐)에틸]피페라진과 반응시켜 생성물을 얻는 것을 특징으로 하는, (3-시아노-1H-인돌-7-일)[4-(4-플루오로페닐)피페라진-1-일]-메타논 및 이의 염의 제조 방법에 관한 것이다.
Abstract:
Disclosed herein is an efficient, economical, industrially advantageous, straight-through process for the preparation of cyclic amides, also referred as lactams, in substantially pure form and high yield, from the corresponding cyclic ketones and a hydroxylammonium salt, using a combination of amphoteric metal oxide or amphoteric masked metal oxide and a base.
Abstract:
Present invention describes the direct catalytic liquid phase synthesis of caprolactam from cyclohexanone, hydrogen peroxide and ammonia. The invention can be carried out by using mesoporous materials amongst the MMS family (mesoporous molecular sieves) as catalysts, such as Ti-MCM-41, A1-MCM-41 and Ti-SBA-15 materials at temperatures between 20 and 120 °C.