首页> 外国专利> METHOD FOR PRODUCING 4-6C DICARBOXYLIC ACID ESTERS FROM ALKALI WASTE FLUID OCCURRING IN CAPROLACTAM PRODUCTION PROCESS

METHOD FOR PRODUCING 4-6C DICARBOXYLIC ACID ESTERS FROM ALKALI WASTE FLUID OCCURRING IN CAPROLACTAM PRODUCTION PROCESS

机译:在己内酰胺生产过程中由碱废液产生4-6C双羧酸酯的方法。

摘要

PROBLEM TO BE SOLVED: To provide a method for efficiently carrying out recovery and production of a 4-6C dicarboxylic acid from an alkali waste fluid occurring in the production process of caprolactam and production of a useful substance such as an ester, etc. ;SOLUTION: This method for efficiently recovering and producing the objective substance from the waste fluid comprises (a) neutralizing the waste fluid with sulfuric acid, subjecting the resulting solution to phase separation and adding nitric acid to an oil phase to convert an organic substance into a dicarboxylic acid by oxidation reaction, (2) distilling a monocarboxylic acid and nitric acid at a first stage and decomposing residual nitric acid and a nitro compound at a second step by two-stage concentration to give concentrated crude product of the objective dicarboxylic acid, (3) subjecting the concentrated crude product to semiesterification with an alcohol at a first stage and obtaining crude product of the dicarboxylic acid at a second stage and (4) purifying the product by distillation.;COPYRIGHT: (C)2003,JPO
机译:解决的问题:提供一种方法,该方法可有效地从己内酰胺生产过程中产生的碱废液和有用物质(如酯等)的生产中回收和生产4-6C二羧酸;解决方案:这种从废液中有效地回收和生产目标物质的方法包括:(a)用硫酸中和废液,将所得溶液进行相分离,然后将硝酸添加到油相中,以将有机物转化为二羧酸(2)在第一步中蒸馏一元羧酸和硝酸,并在第二步中通过两步浓缩将残余的硝酸和硝基化合物分解,得到目标二羧酸的浓缩粗产物,(3 )在第一步将浓缩的粗产物与醇进行半酯化反应,得到二羧酸ac的粗产物第二阶段,并(4)通过蒸馏纯化产物。;版权:(C)2003,JPO

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