Date of Publication:2021-01-01

Journal:Membrane Science and Technology

Volume:41

Issue:2

Page Number:81-87,95

ISSN:1007-8924

Key Words:"proton exchange membrane hydrogen pump; hydrogen sepatation; non-fluorine proton exchange memrane; recovery; energy efficiency"

CN:62-1049/TB

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 H_2 to CO_2 ratios are established.Within the low hydrogen content in the inlet H_2/CO_2 mixed gas (less than about 33.3%),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.

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