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FAU zeolite membranes for dewatering of amine‐based post‐combustion CO 2 capture solutions
Author(s) -
Zhu Feng,
Landon James,
Liu Kunlei
Publication year - 2020
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.17042
Subject(s) - membrane , chemical engineering , amine gas treating , dewatering , zeolite , chemistry , stripping (fiber) , solvent , aqueous solution , permeation , materials science , organic chemistry , catalysis , composite material , biochemistry , geotechnical engineering , engineering
In amine‐based CO 2 capture processes, aqueous amine solvent is circulated between absorber (CO 2 absorption) and stripping (solvent regeneration) columns. To reduce solvent regeneration energy demand, a selective membrane can dewater and enrich the CO 2 concentration in solution prior to the stripper, lowering steam requirements for solution heating. In this work, a facile synthesis strategy was developed to prepare faujasite (FAU) zeolite membranes built upon polydopamine (PDA) modified α‐Al 2 O 3 substrates. PDA facilitated the attachment of zeolite phases onto the substrate surface to form a 3 μm membrane layer. Membrane permeation flux of 4.45 kg m −2 h −1 and 95% rejection rate calculated by either CO 2 loading or total alkalinity was achieved in dewatering of CO 2 loaded 30 wt% monoethanolamine (MEA) solution. The effects of temperature on membrane dewatering performance and stability were investigated. This study highlights the potential for process integration of membrane technology in amine‐based post‐combustion CO 2 capture operations.