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萃取技术分离工业废水中的苯胺

Keywords: 苯胺,硝基苯,萃取,盐析

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Abstract:

研究以硝基苯为萃取剂,25℃下通过盐析萃取法回收工业废水中苯胺。以静态分批实验考察了废水酸度、初始苯胺浓度、萃取剂与废水比(油水比)、萃取级数、无机盐种类(NaCl,KCl,Na2SO4,CaCl2,K2SO4)和浓度对苯胺萃取率的影响,获得了最佳操作工艺条件。实验结果表明,硝基苯盐析萃取技术可以有效回收废水中苯胺,且高pH和溶剂比有利于苯胺萃取,随着无机盐浓度的增加苯胺回收率增加。在适宜的条件下,通过盐析作用,经过五级萃取苯胺萃取率接近100%。

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