聚丙烯膜膜孔润湿及改性对CO_2脱除影响试验  

Effect of Pore Wetting and Modification of Polypropylene Hollow Fiber Membrane on Removal of CO_2

作　　者：张卫风[1] 吴世东[1] 舒建辉 

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013 [2]中建三局建筑集团有限公司建筑设计院,湖北武汉430000

出　　处：《华东交通大学学报》2016年第2期127-133,共7页Journal of East China Jiaotong University

基　　金：江西省青年科学基金项目(20122BAB213020);江西省科技支撑计划项目(20151BBG70021)

摘　　要：在聚丙烯中空纤维膜吸收法分离CO2的研究中，吸收液会润湿膜孔，导致传质阻力增加，CO2脱除效率降低。试验采用蒸馏水、MEA、MDEA和PG的水溶液作为吸收液，在聚丙烯中空纤维膜试验台上进行连续运行试验，分析膜孔润湿影响因素，并对改性后聚丙烯膜进行比较试验。试验结果表明，吸收液种类、浓度和吸收液流速都对膜润湿性具有一定的影响。改性后的聚丙烯膜抗润湿性远远大于未改性膜，在同等条件下，改性膜的润湿时间为未改性膜的2~3倍，同时受吸收液浓度和流速的影响也较小，从而可选择较高的吸收液浓度和流速，以提高CO2脱除率和传质效率。Studies on separating CO2 by polypropylene hollow fiber membrane absorption indicate that the mem-brane liquid would wet membrane pores, resulting in the increase of the mass transfer resistance and low CO2 re-moval efficiency. In this study, the aqueous solution of MEA, MDEA, PG and distilled water were used as the absorption solution. After the long-term running test on the polypropylene hollow fiber membrane test bed, the influence factors of wet membrane pore were analyzed, and the comparison test of modified polypropylene mem-branes was made. Experimental results showed that, concentration and flow velocity of the absorbing solution both had effect on the wettability of the membranes. The anti-wettability of modified polypropylene membranes was far better than that of unmodified membranes. Under the same condition, the wetting time of the modified membranes was 2-3 times of that of the unmodified membranes, and the influence of the absorption liquid con-centration and flow velocity was less. Therefore, the high concentration and flow rate can be selected to improve the CO2 removal efficiency and mass transfer efficiency.

关 键 词：聚丙烯中空纤维膜 膜孔润湿 膜改性 膜吸收 二氧化碳脱除 

分 类 号：X701.7[环境科学与工程—环境工程]