Rigid double-stranded siloxane-induced high-flux carbon molecular sieve hollow fiber membranes for CO2/CH4 separation

被引：51

作者：

Shin, Ju Ho ^{[1
]}

Yu, Hyun Jung ^{[1
]}

An, Heseong ^{[1
]}

Lee, Albert S. ^{[2
]}

Hwang, Seung Sang ^{[2
]}

Lee, Seung Yong ^{[2
]}

Lee, Jong Suk ^{[1
]}

机构：

[1] Sogang Univ, Dept Chem & Biomol Engn, Baekbeom Ro 35, Seoul 04107, South Korea

[2] Korea Inst Sci & Technol, Mat Architecturing Res Ctr, Hwarang Ro 14 Gil 5, Seoul 02792, South Korea

来源：

JOURNAL OF MEMBRANE SCIENCE | 2019年 / 570卷

基金：

新加坡国家研究基金会;

关键词：

Carbon molecular sieve fibers; Ladder-structured polysilsesquioxane; CO2/CH4; separation; Physical aging; Plasticization resistance; HIGH-PRESSURE; PLASTICIZATION RESISTANCE; GAS-PERMEABILITY; CROSS-LINKING; POLYMER; TRANSPORT; SORPTION;

D O I：

10.1016/j.memsci.2018.10.076

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Carbon molecular sieve (CMS) membranes are a promising candidate for natural gas processing due to their peculiar pore structure-induced excellent separation performance. Formulating ultrathin, defect-free CMS hollow fiber membranes is, however, still challenging due to damage on porous sub-structures induced by thermal relaxation of polymer chains during pyrolysis. Herein, we report a new methodology enabling high separation performance and good plasticization resistance in CMS fiber membranes by uniform integration of double-stranded polysilsesquioxanes into the polyimide matrix. Our polyimide/ladder-structured polysilsesquioxane CMS fibers substantially enhanced CO2 permeance by as much as 546% compared to the precursor fiber analogues due to the thin molecular sieve selective layer. Also, poly(dimethylsiloxane) coating delayed physical aging, still showing a high CO2 permeance of 354 GPU with CO2/CH4 selectivity of 56 after 72 days of aging. Furthermore, they exhibited excellent plasticization resistance up to a CO2 partial pressure of 13.2 bar with CO2/CH4 separation factor of 74 for an equimolar CO2/CH4 feed mixture.

引用

页码：504 / 512

页数：9