处理苯胺类稀溶液的萃取置换技术.pdf

第 22 卷第 1 期 环 　　境 　　科 　　学 Vol . 22 ,No . 1 200 1 年 1 月 EN V IRON M EN TAL SCIEN CE J an . ,200 1 处理苯胺类稀溶液的萃取置换技术 冯旭东 ,林屹 ,瞿福平 ,戴猷元 (清华大学化学工程系萃取分离国家重点实验室 ,北京 　100084 , E mail :fengxd @mail . cic . edu . t singhua . edu . cn) 摘要 :苯胺和间氯苯胺的BOD / COD 测定结果表明 ,随着溶质浓度的升高 ,其水溶液的生物降解性显著降低. 5 Cr 为使此类溶液能够进行生物处理 ,必须降低其浓度. 在考察有机溶剂和络合剂 P204 生物降解性的基础上 ,对苯 胺和间氯苯胺稀溶液进行了溶剂萃取和络合萃取的研究. 对影响有机溶剂和络合溶剂萃取分配系数的因素进行 了讨论. 萃残液的BOD / COD 值表明 ,选择合适的萃取剂进行萃取 ,其萃残液无需进一步稀释就可进行生物处 5 Cr 理 ,论证了萃取置换法治理难降解有机废水的潜力. 关键词 :苯胺 ; 间氯苯胺 ;生物降解性 ;萃取置换 ( ) 中图分类号 :X703 　文献标识码 :A 　文章编号 :0250330 1 200 1 0 104007 1 Treatment of Dil ute Sol ution Anil inescontaining with Displacement by Extraction Feng Xudong ,Lin Yi , Qu Fuping ,Dai Youyuan ( State Key Laborory of Solvent Extraction ,Dep art ment of Chemical Engineering , Tsinghua University ,Beijing 100084 ,China Email :fengxd @mail . cic . edu . t singhua . edu . cn) Abstract :It was found t hat t he biodegradability (indicated by BOD / COD value of water solution containing anilire or 5 Cr chloroaniline declined wit h t he increasing of t heir concentration . In order to biotreat such water ,decrease of t he solute ’ s concentration was necessary . Based on t he research of organic solvent s’and complexing agent ’s biodegradability ,a se ries of extraction exp eriment s were conducted for aniline and mchloroaniline wit h complexing agent or p hysical solvent . The factors influencing t he distribution ratio were discussed . The BOD / COD value of raffinates showed t hat t he raffi