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Effective separation of low hydrogen containing gases with proton exchange membrane electrochemical hydrogen pump

Authors： CUI Fujuna, FAN Shuaib, DAI Yanb, Pan Dongweib, WU Xuemeib*, HE Gaohong

Units： Panjin Institute of Industrial Technology, Liaoning Key Laboratory of Chemical Additive Synthesis and Separation, Dalian University of Technology, Panjin 124221, Liaoning, China; bState Key Laboratory of Fine Chemicals, Research and Development Center of Membrane Science and Technology, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China

KeyWords： Proton exchange membrane; hydrogen pump; high purity of hydrogen; energy efficiency

ClassificationCode：TQ028、TM912.1

year,volume(issue):pagination： 2021,41(2):81-87

Abstract：

By far the most important resource for hydrogen fabrication is fossil fuels, but the conventional separation methods for low hydrogen containing gases have several disadvantages such as low separation efficiency and high energy consumption, thus result in the waste of the hydrogen containing gases. In this work, a novel method to separate low hydrogen containing gases in proton exchange membrane hydrogen pump (PEMHP) is proposed, in which atmospheric pressure could be applicated due to the extreme high electrochemical selective dissociation and conduction of hydrogen in EHP, and the proton exchange membrane (PEM) could act as gas penetration barrier between anode and cathode chambers. Experimental correlations of hydrogen recovery and energy efficiency as functions of operating voltage, inlet flow rate with different H2 to CO2 ratios are established. Within the low hydrogen content in the inlet H2/CO2 mixed gas (less than about 33.3 vol.%), the hydrogen recovery is up to 95%. The lower the hydrogen content in the feedstock, the higher the energy efficiency of the hydrogen pump, and the energy efficiency is close to about 65%. Further investigations on the non-fluorine PEM based EHP indicate that the purity of the hydrogen product could be elevated to 99.99%, owing to much less gas permeation across PEM caused by the steric hindrance of aromatic polymer backbone. The application of the non-fluorine PEMs in EHP also significantly reduces the cost of hydrogen pump, therefore makes it feasible to produce high purity of hydrogen with low cost.

Funds：

辽宁省化学助剂合成与分离省市共建重点实验室2020年开放课题（ZJKF2012），国家自然科学基金（面上21776034，创新群体22021005）；国家自然科学基金联合基金（U1663223,U1808209）；中央高校举报科研业务费(DUT21TD101)；辽宁省教育厅(LT2015007)；科技部重点领域创新团队（2016RA4053）

AuthorIntro：

崔福军(1970-)，男，河北承德人，研究方向为气体膜分离及粘合剂，Email：1012293273@qq.com

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