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A simple one‐step drop‐coating approach on fabrication of supported carbon molecular sieve membranes with high gas separation performance
Author(s) -
Wu Yonghong,
Wang Fei,
Zhang Bing,
Zhao Dandan,
Wang Tonghua,
Qiu Jieshan
Publication year - 2018
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2251
Subject(s) - materials science , coating , microstructure , permeation , chemical engineering , pyrolysis , gas separation , thermogravimetric analysis , thermal stability , membrane , fabrication , polyimide , composite material , drop (telecommunication) , chemistry , layer (electronics) , medicine , biochemistry , alternative medicine , pathology , engineering , telecommunications , computer science
Supported carbon molecular sieve membranes (CMSMs) were fabricated from polyimide, via coating, drying, and pyrolysis. Thermogravimetric analysis, X‐ray diffraction, and scanning electron microscope were used to characterize the thermal stability of precursor, microstructure, and morphology of CMSMs, respectively. The influences of coating droplets, pyrolysis temperature, permeation temperature, and pressure on the gas permeation of CMSMs were investigated. Results show that high‐performance CMSMs can be easily obtained by one‐step drop‐coating. Coating with more droplets brings about more amorphous microstructure and higher gas permeability of CMSMs. The gas permeability of CMSMs increases with elevating permeation temperature or reducing pyrolysis temperature. The as‐prepared CMSMs can enrich the molar composition of oxygen to 66% from the compressed air by single one time.