膜科学与技术

Janus膜的制备及其在CO2强化吸收中的应用

作者：吴文渊，李韵浩，付晓燕，刘铭辉，康国栋，曹义鸣，车如心，于海军

单位： 1.大连交通大学，大连 116023；2.中国科学院大连化学物理研究所，大连 116023；3.辽宁省大连生态环境监测中心，大连 116023；4.中海油能源发展股份有限公司安全环保分公司，天津 300457

关键词： Janus中空纤维膜；微气泡；CO2吸收

出版年,卷(期):页码： 2023,43(3):54-63

摘要：

分别以亲水性和疏水性聚合物溶液为外层和内层制膜液，通过共挤出法制备双层膜。以正丙醇为芯液，水为凝胶浴，调控成膜过程中的热力学和动力学参数，成功制备出外层亲水/内层疏水的Janus中空纤维膜。Janus中空纤维膜的外层水接触角为44°，内层水接触角为131°。将Janus膜应用于模拟烟道气中CO2吸收研究，考察气/液压差、吸收液体积流量和亲/疏水层厚度对CO2吸收性能的影响。当气-液压差为0.11 MPa时，模拟烟道气中CO2吸收率达到99.43%，气体处理通量为6050 L/（m2·h）；在240 min连续吸收过程中，Janus膜的气体处理通量和CO2吸收率保持稳定。

The dual-layer membranes were prepared by co-extrusion method which adopt hydrophilic and hydrophobic dope solutions as the outer and inner membrane solutions. With n-propanol as the bore liquid and water as the external water bath, the thermodynamic and kinetic parameters in the film-forming process were adjusted to successfully prepare the Janus hollow fiber membrane which had a structure of outer hydrophilic/inner hydrophobic. The water contact angle of the outer layer and inner layer of the Janus hollow fiber membrane were 44° and 131° separately. Janus membrane was applied to the absorption process of CO2 in simulated flue gas. The effects of gas/liquid pressure difference, absorbent volume flow and hydrophilic/hydrophobic layer thickness on CO2 absorption performance were investigated. When the gas/ liquid pressure difference was 0.11 MPa, the CO2 absorption rate in the simulated flue gas reached 99.43 %, and the gas treatment flux was 6050 L/(m2·h). During the 240 min continuous absorption process, the gas treatment flux and CO2 absorption rate remained stable.

吴文渊（1995-），男，江西上饶人，硕士，主要从事Janus膜制备和应用研究，E-mail：wywu@dicp.ac.cn.

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