| 摘要 |
The invention is an improved gas separation membrane comprising a thin discriminating layer consisting predominantly of a carbonate polymer derived from a bisphenol corresponding to formula I <IMG> wherein R at each occurrence is independently H, Cl, Br, or C1-C4 alkyl and R1 is -CO-, -S-, -SO2-, -O-, a C1-C6 divalent hydrocarbon radical, or a C1-C6 divalent fluorocarbon radical, or inertly substituted C1-C6 33,434-F divalent hydrocarbon radical, with the proviso that at least 25 weight percent of the moieties derived from the bisphenol of formula I present in the discriminating layer bear R groups which are exclusively Br or Cl, said gas separation membrane exhibiting a separation factor for oxygen and nitrogen at the ambient temperature of at least 6.1. In another aspect this invention relates to a process for separating oxygen from nitrogen, or a nitrogencontaining gas. 33,434-F
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