公开(公告)号：US3852273A

公开(公告)日：1974-12-03

申请号：US24972772

申请日：1972-05-02

Applicant: STAMICARBON

Inventor： DE ROOIJ A H

IPC: C07D201/04 ,  C07D201/16 ,  C07D41/06

CPC classification number: C07D201/16 ,  C07D201/04

Abstract: A process for preparing and recovering lactams by the so-called Beckmann rearrangement of the corresponding ketoximes in a sulfuric acid medium is disclosed, wherein the mixture of lactam and sulfuric acid medium obtained from the Beckmann rearrangement is mixed with an aqueous solution of ammonium sulfate obtained as a by-product in the synthesis of hydroxylammonium sulfate in the preparation of said ketoximes. The lactam is then extracted from the resulting less acidic solution and the remaining acid solution, comprising an aqueous solution of ammonium hydrogen sulfate, is thermally decomposed to produce recoverable sulphur dioxide. The process of this invention can be used in the production of lactams while avoiding the production of ammonium sulfate byproduct.

Abstract translation: 公开了通过在硫酸介质中相应酮肟的所谓贝克曼重排制备和回收内酰胺的方法，其中将从贝克曼重排得到的内酰胺和硫酸介质的混合物与得到的硫酸铵水溶液混合 作为在制备所述酮肟时合成羟基硫酸铵的副产物。 然后从所得的较少酸性溶液中提取内酰胺，并将包含硫酸氢铵水溶液的剩余酸溶液热分解以产生可回收的二氧化硫。

公开(公告)号：US3852272A

公开(公告)日：1974-12-03

申请号：US24964272

申请日：1972-05-02

Applicant: STAMICARBON

Inventor： DE ROOIJ A H

IPC: C07D223/02 ,  C07D201/16 ,  C07D41/06

CPC classification number: C07D201/16

Abstract: A process for recovering lactam from a mixture of lactam and sulphuric acid is disclosed, wherein the mixture of lactam and sulphuric acid, such as that produced in a Beckmann rearrangement is partially neutralized and diluted by the addition of ammonia water. The amount of ammonia added is such that the molar ratio

Abstract translation: 公开了从内酰胺和硫酸的混合物中回收内酰胺的方法，其中内酯和硫酸的混合物，例如以贝克曼重排产生的那些，被部分中和并通过加入氨水稀释。 加入的氨的数量使得（NH 4）2 SO 4 /（NH 4）2 SO 4 + H 2 SO 4的摩尔比为约0.30:1至0.65:1。 加入的水的量为每摩尔最初存在的三氧化硫约3至约10摩尔水。 通过与水不混溶的有机内酰胺溶剂逆流萃取将内酰胺与部分中和的硫酸分离。