Influence of quench medium on the structure and gas permeation properties of cellulose acetate membranes

✍ Scribed by Ji Hua Hao; Shichang Wang

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 362 KB
• Volume: 68
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19980523)68:8<1269::aid-app8>3.0.co;2-b

✦ Synopsis

Integrally skinned asymmetric cellulose acetate membranes made by the wet phase inversion for removal of CO 2 from natural gas were investigated. The membrane was cast with the membrane-forming systems of cellulose acetate-acetone and quench media, such as methanol, ethanol and isopropanol, respectively, without heattreating and multistage exchange process. By means of evaluation on separating characteristics of the membrane for CO 2 /CH 4 , observation of morphologies by scanning electron photomicrographs and analysis of the phase diagrams on the membrane-forming systems, it has shown that the membrane-forming system of cellulose acetateacetone-methanol is quite suitable to prepare integrally skinned asymmetric cellulose acetate membranes for gas separation with good selectivity CO 2 /CH 4 Å 30 and flux coefficient Å 2.4 1 10 05 cm 3 /cm 2 0 s 0 cm Hg.