Preparation of polycarbonate/metal salt gas separation membranes

✍ Scribed by Juin-Yih Lai; Shih-Hsiung Chen; Mei-Hsiu Lee; S. S. Shyu

• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 870 KB
• Volume: 47
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1993.070470902

✦ Synopsis

Republic of China

SYNOPSIS

Polycarbonate ( PC) membranes possess high 0 2 / N 2 selectivity and mechanical strength, but have low gas permeability. In order to improve the pure PC membrane's gas permeability and selectivity of 0 2 / N 2 , in this study we attempt to combine transition metal salts into the membrane to form a complex membrane. Tensile strength and elongation at break of the membrane are not significantly changed. The effect of casting solution composition and solvent evaporation time on morphology, gas permeability, and 'selectivity of O2 / N2 of PC membranes are studied. The gas permeabilities of PC/DMF/Metals membranes are significantly improved, as compared to those of pure PC membrane. For example, an oxygen permeability of 137 cm3 (STP) -cm/cm2-sec-cmHg and separation ratio of oxygen to nitrogen of 4.0 for PC/DMF/CuC12 membrane with [PC/CH2C12]/[CuC12/DMF] = 17/ 3 mL/mL, and CuC12/DMF = 0.1 g/mL, can be obtained. The FT-IR spectra and elementary analysis suggest that there is interaction among metal, DMF, and PC.