Application of poly(phthalazinone ether sulfone ketone)s to gas membrane separation

✍ Scribed by X. G. Jian; Y. Dai; L. Zeng; R. X. Xu

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 137 KB
• Volume: 71
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19990404)71:14<2385::aid-app10>3.0.co;2-s

✦ Synopsis

A series of poly(phthalazinone ether sulfone ketone) (PPESK) copolymers containing different component ratios of bis(4-fluorodiphenyl) ketone and bis(4-chlorodiphenyl)sulfone with respect to a certain amount of 4-(4-hydroxyphenyl)-2,3-phthalazin-1-one were synthesized by polycondensation. Glass transition temperatures of these polymers were adjusted from 263°C to 305°C by changing the ratios of reactants. Gas permeability and selectivity of the dense membranes of the polymers for three kinds of gases (CO 2 , O 2 , and N 2 ) were determined at different temperatures. The result indicated that the membrane of PPESK (S/K ϭ 1/1, mol ratio) had an excellent gas separation property. Permeability of the polymer membranes for CO 2 , O 2 , and N 2 was P CO 2 ϭ 4.121 barrier, P O 2 ϭ 0.674 barrier, and P N 2 ϭ 0.0891 barrier, respectively. Separation factors of ␣ O 2 /N and ␣ CO 2 /N 2 were 7.6 and 46, respectively. New material was made into a composite membrane with silicone rubber for blocking up leaks and defects on the surface of its nonsymmetrical membrane. As a result of the test, permeability of the composite membrane was J O 2 ϭ 7.2 ϫ 10 Ϫ6 cm 3 (STP) cm Ϫ2 S Ϫ1 cm Ϫ1 Hg and J N 2 ϭ 0.99 ϫ 10 Ϫ6 cm 3 (STP) cm Ϫ2 S Ϫ1 cm Ϫ1 Hg, whereas the ␣ O 2 /N 2 was still higher than 7. These showed that PPESKs had a bright prospect as the potential membrane material for high-temperature gas separation.