氯仿萃取回收己内酰胺的研究
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湖南省高校创新平台开放基金项目(11k06)


Recovery of caprolactam by Solvent Extraction with Chloroform
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    摘要:

    以萃取回收甲苯法生产己内酰胺废液中的己内酰胺为目的,选择氯仿作萃取剂,进行了萃取回收己内酰胺的研究。考察了原料液的pH值、萃取温度、萃取时间等因素对氯仿萃取己内酰胺过程的影响。结果表明,在酸性条件下该萃取过程分配比随Ph值的升高而增大,当pH=7时分配比最大;萃取过程为快速过程,20 min即可达到萃取平衡;水相中硫酸铵和1-磺酸基环己烷羧酸对萃取过程有盐析效应,使分配比增大;萃取过程受温度影响不大,焓变值?H=2.86 kJ?mol ?1。实验确定了pH=7时己内酰胺在有机相与水相中分配平衡关系,当有机相和水相间体积比为1时,3级错流萃取的回收率可达到98%以上。同时,进行了工业废水的萃取验证实验,结果表明氯仿对废水中己内酰胺的萃取效果良好。

    Abstract:

    In order to recover caprolactam from wastewater in the production of caprolactam from toluene, the behavior of caprolactam extraction with chloroform as extractant was studied. The influences of the pH of the solvent, extraction temperature and contact time on the extraction process were investigated. The experimental results showed that the extraction process is a fast extraction process. The distribution ratio increases with the increase of pH of the aqueous solution and reaches its maximum when pH=7. It was found that ammonium sulfate and 1-sulfonic acid-1-cyclohexanecarboxylic acid in the aqueous solution have the salting-out effect which can enhance the distribution ratio. The extraction temperature has only a little effect on the extraction process. The distribution equilibrium relation of caprolactam with chloroform in aqueous and organic solution with pH=7 was determined and the extraction enthalpy of 2.86 kJ?mol-1 was obtained by experimental measurement. When the volume ratio of organic to aqueous phase is 1, the recovery yield of 3-stage cross-flow extraction is above 98%. The results of cross-flow extraction for industrial wastewater with Chloroform showed that Chloroform is the suitable solvent for the recovery of caprolactam from industrial effluent.

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马帅,段正康,贺玉平,李立南,张文倩.氯仿萃取回收己内酰胺的研究[J].精细化工,2012,29(1):

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  • 收稿日期:2011-10-18
  • 最后修改日期:2011-10-18
  • 录用日期:2011-11-01
  • 在线发布日期: 2011-12-26
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