膜气体吸收技术分离VOCs/N_2混合气性能的研究  

Membrane-based gas absorption for separation of VOCs/N_2

作　　者：李睿[1] 徐军[1] 许志良[1] 王连军[1] 李健生[1] 孙秀云[1] 

机构地区：[1]南京理工大学化工学院,南京210094

出　　处：《环境工程学报》2008年第9期1194-1198,共5页Chinese Journal of Environmental Engineering

基　　金：江苏省省级环保科技项目(2005005)

摘　　要：以C6H6／N2混合气为代表，疏水性聚丙烯中空纤维膜为气液接触膜，n-甲酰吗啉（NFM，n-formylmorpholine）水溶液为吸收剂，研究了膜气体吸收法分离VOCs／N2混合气性能。考察了吸收剂流量、吸收剂体积分数、进口气流量、进口气浓度和膜组件结构等诸因素对分离性能的影响。结果表明，在吸收剂流量为20～100mL／min，进口气流量为40～300mL／min，进口气浓度为10．2mg／L的条件下，苯的去除率为65．0％～99．6％，总体积传质系数为0．0157～0．08412s-1。实验证明，采用疏水性多孔膜气体吸收法，NFM水溶液吸收分离VOCs／N2混合气具有较高的分离效率和较快的传质速率。The work focuses on a membrane based gas absorption process for the separation VOCs from N2- Benzene was chosen as the target VOCs and the aqueous solution of n-formyl morpholine （NFM） was used as ab- sorbent. Mass-transfer performance of separation benzene was studied in the hollow fiber polypropylene membrane （HFPPM）. Effect of various factors, including flowrate of absorbent and feeding gas, concentration of ab- sorbent and feeding gas, differences of membranes modules on the efficiency of benzene absorption were investi- gated. The results show that the removal efficiency achieves 65.0 % - 99.6 % and the overall volume transfer coefficient achieves 0. 0157 - 0. 08412 s-1, when following conditions were used： concentration of feed gas, 10.2 mg/L; flowrate of absorbent, 20- 100 mL/min; flowrate of feed gas, 40 -300 mL/min. The characteristics of separation of VOCs/N2 by membrane contactor are of quicker mass transfer velocity and higher efficiency of separation.

关 键 词：膜气体吸收 聚丙烯中空纤维膜 N-甲酰吗啉 VOCS 苯 

分 类 号：TQ028.8[化学工程]