期刊
AICHE JOURNAL
卷 66, 期 4, 页码 -出版社
WILEY
DOI: 10.1002/aic.16850
关键词
adsorption; molecular sieving; organosilica membrane; propylene; propane separation; suitable pore size
资金
- China Scholarship Council [201708320384]
- Tonen General Sekiyu Research/Development Encouragement & Scholarship Foundation
Fine-tuned, molecular-composite, organosilica membranes were fabricated via the co-condensation of organosilica precursors bis(triethoxysilyl)acetylene (BTESA) and bis(triethoxysilyl)benzene (BTESB). Fourier transform infrared and UV-vis spectra confirmed the co-condensation behaviors of BTESA and BTESB. The evolution of the network structure indicated that the incorporated BTESB decreased the membrane pore size, which was determined by a modified gas translation model according to the steric effect of the phenyl groups. The incorporation of BTESB to BTESA finely tuned the membrane structure and endowed the resultant composite membrane with improved separation properties. The BTESAB 9:1 membrane (molar ratio of BTESA/BTESB was 9:1) exhibited high C3H6 permeance at 4.5 x 10(-8) mol m(-2) s(-1) Pa-1 and a C3H6/C3H8 permeance ratio of 33 at 50 degrees C. One of the most important developments of this study involved clearly defining the relationship between membrane pore size and C3H6/C3H8 separation performance for organosilica membranes in single and binary separation systems.
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