膜萃取处理高浓度苯胺废水膜传质动力学  

Mass transfer kinetics through membrane for highly concentrated aniline-loading wastewater treatment by membrane extraction

作　　者：周集体[1] 吴丽丽[1] 张爱丽[1] 杨桦[1] 

机构地区：[1]大连理工大学环境与生命学院,辽宁大连116024

出　　处：《大连理工大学学报》2010年第1期20-25,共6页Journal of Dalian University of Technology

摘　　要：采用膜萃取新工艺处理高浓度苯胺废水.工艺中料液侧苯胺分子透过无孔硅橡胶膜与萃取液侧的HCl反应生成苯胺盐酸盐达到分离富集的目的.实验考察了料液流量、反应温度等因素对膜萃取性能的影响,分析了萃取回收率、HCl质量分数及萃取液pH等对系统的影响,并考察了该工艺对绿源药业工业含苯胺废水的应用效果.实验发现:无孔硅橡胶膜对苯胺分子有较稳定的透过性和较高的渗透通量;总传质系数与温度之间符合Arrhenius关联式.对系统进行物料衡算,发现苯胺的回收率维持在93%以上.在进水流量Fw=3.05L.d-1,T=323 K,pH≈1,膜管长L=18 m的条件下,模拟废水苯胺去除率可达97%.在上述操作条件下,处理绿源药业工业苯胺废水,苯胺去除率亦在97%以上.A new process for the treatment of highly concentrated aniline-loading wastewater is described. In this process, the aniline was extracted through nonporous silicone rubber membranes and concentrated into an HCl solution as hydrochloride salts. The influences of wastewater flow rate and temperature on membrane extraction process were investigated. Recovery efficiency of the stripping solution, the HCl concentration and pH in the stripping solution at steady state were analyzed. This process was used to treat wastewater from a pharmaceutical industry Lynchem. The experimental results show that the nonporous silicone rubber membrane possesses very high permeation flux and stable selectivity for aniline solution; the relationship of overall mass transfer coefficient with temperature is confirmed to fit Arrhenius relation. The aniline mass balance of the whole system shows that the recovery efficiency of the aniline is up to 93%. The aniline removal efficiency of synthetic wastewater is about 97 % under conditions of flow rate 3.05 L · d^-1 , temperature 50 ℃ and pH ≈ 1, membrane length 18 m. The aniline removal efficiency is up to 97% in the industrial wastewater from Lynchem under above conditions.

关 键 词：硅橡胶膜 膜萃取 传质系数 苯胺废水 

分 类 号：TQ028.8[化学工程]