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:
Methods for producing lactams from oximes by performing a Beckmann rearrangement using a silicoaluminophosphate catalyst are provided. These catalysts may be used in gas phase or liquid phase reactions to convert oximes into lactams. High conversion of oxime and high selectivity for the desired lactams are produced using the disclosed methods, including high conversion and selectivity for ε-caprolactam produced from cyclohexanone oxime and high conversion and selectivity for ω-laurolactam produced from cyclododecanone oxime.
Abstract:
The invention relates to a method for preparing a lauryl lactam consisting in carrying out a Beckmann rearrangement of a cyclododecanone oxime. Said method is carries out in a gaseous phase at a temperature ranging from 180 to 450 °C in the presence of a microporous material having a three-dimensional main inorganic structure consisting of tetrahedrons bonded by a common edge called zeolithe.
Abstract:
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) SO 3 and (iii) caprolactam, wherein the SO 3 content of the reaction mixture is between 9 and 20 wt.% and the molar ratio M of the reaction mixture defined as (n SO3 + n H2SO4 )/n cap is between 1 and 1.4 wherein n SO3 = quantity of SO 3 in reaction mixture, in mol n H2SO4 = quantity of H 2 SO 4 in reaction mixture, in mol n cap = quantity of caprolactam in reaction mixture, in mol.
Abstract translation:本发明涉及通过将环己酮肟进料到包含(i)硫酸(ⅱ)SO 3和(ⅲ)己内酰胺)的反应混合物中的贝克曼重排环己酮肟来制备己内酰胺的方法,其中反应混合物的SO 3含量为9 和20重量%,并且定义为(nSO 3 + n H 2 SO 4)/ ncap的反应混合物的摩尔比M在1和1.4之间,其中nSO 3 =反应混合物中SO 3的量,以mol n H 2 SO 4 =反应混合物中的H 2 SO 4的量, mol ncap =反应混合物中己内酰胺的量,以mol计。
Abstract:
La presente invención se refiere a un procedimiento para la preparación de dodecalactama, el precursor del monómero del Nylon-12, y particularmente mediante la utilización de materiales laminares como catalizadores ácidos heterogéneos para la producción de dodecalactama por transposición de Beckmann de la oxima de la ciclododecanona.
Abstract:
A process for continuously producing a lactam in water at a high temperature under a high pressure. Namely, a process for producing a lactam characterized by selectively synthesizing the lactam without causing hydrolysis by introducing an oxime into flowing water at a high temperature under a high pressure, wherein the lactam is continuously synthesized at a high rate from the oxime in water at a high temperature of 250 DEG C or more under a high pressure of 12 Mpa or more.
Abstract:
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 process for producing an amide compound such as epsilon -caprolactam by subjecting an oxime compound such as cyclohexanone oxime to Beckmann rearrangement in a liquid phase, characterized in that the reaction is carried out in the presence of (1) a non-fluorine-containing sulfonic anhydride and an N,N-disubstituted amide compound or (2) at least one compound selected from the group consisting of sulfonic acids and anhydrides thereof, an N,N-disubstituted amide compound, and a carboxylic anhydride.