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Preparation of Janus membrane and its application in CO2 enhanced absorption

Authors： WU Wenyuan，LI Yunhao，FU Xiaoyan，LIU Minghui，KANG Guodong，Cao Yiming，CHE Ruxin，YU Haijun

Units： 1.School of Environment and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China；2.Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China；3.Dalian Ecological Environment Monitoring Center of Liaoning Province, Dalian 116023, China；4.CNOOC EnerTech-Safety & Environmental Protection Co., Tianjin 300452, China

KeyWords： Janus hollow fiber membrane; micro bubbles; CO2 absorption

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2023,43(3):54-63

Abstract：

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.

Funds：

国家自然科学基金面上项目（22178334；21978284）；陕西省重点研发计划项目（2021SF-449）

AuthorIntro：

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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