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Chemical Engineering Communications Volume 206, 2019 - Issue 12
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Articles

Membrane separation process modeling for CO2 partial removal in prepurification of air separation units

Dongyun WuShaanxi Key Laboratory of Energy Chemical Process Intensification, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, P.R. China; View further author information
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Chunhai YiShaanxi Key Laboratory of Energy Chemical Process Intensification, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, P.R. China; Correspondence[email protected]
View further author information
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Wei WangInstitute of Chemistry, Chinese Academy of Sciences, Beijing, P.R. ChinaView further author information
,
Yixuan WangShaanxi Key Laboratory of Energy Chemical Process Intensification, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, P.R. China; View further author information
,
Bolun YangShaanxi Key Laboratory of Energy Chemical Process Intensification, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, P.R. China; View further author information
&
Suitao QiShaanxi Key Laboratory of Energy Chemical Process Intensification, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, P.R. China; View further author information
Pages 1676-1688 | Published online: 08 Feb 2019
 
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Abstract

A novel membrane/adsorption hybrid system was proposed for air prepurification in large scale air separation units. Mathematical models were established for cocurrent and countercurrent flow patterns with crude nitrogen as purge stream to describe the membrane separation performance. The experimental and predicted results are in good agreement confirming the validity of the mathematical models. Effects of membrane properties and operation parameters on O2 recovery, N2 recovery, and membrane area requirement were investigated. For countercurrent flow pattern, O2 recovery and N2 recovery were larger than 98 and 99%, respectively, and membrane area requirement was less than 0.25 m2/m3•h−1 with feed side pressure of 0.6 MPa and the purge gas/feed gas ratio of 0.2.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work is supported by the National Key R&D Program of China (2017YFB0603402), the National Natural Science Foundation of China (21576217), and the Fundamental Research Funds for the Central Universities (xjj2016044).

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