Gas separation – With separating media bypass or system gas pressure relief – Valved bypass means
Patent
1988-01-06
1989-04-04
Spitzer, Robert
Gas separation
With separating media bypass or system gas pressure relief
Valved bypass means
55 68, 55158, 528202, B01D 5322
Patent
active
048182540
ABSTRACT:
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 ##STR1## wherein R at each occurrence is independently H, Cl, Br, or C.sub.1 -C.sub.4 alkyl and R.sup.1 is ##STR2## --S--, --SO.sub.2 --, --O--, or a C.sub.1 -C.sub.6 divalent hydrocarbon or a C.sub.1 -C.sub.6 divalent fluorocarbon radical or inertly substituted 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, the gas separation membrane exhibiting a separation factor for oxygen and nitrogen at 24.degree. C. of at least 6.1. In another aspect this invention relates to a process for separating oxygen from nitrogen, or a nitrogen-containing gas.
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Anand Joginder N.
Bales Stephen E.
Feay Darrell C.
Jeanes Thomas O.
Sims Norman L.
Spitzer Robert
The Dow Chemical Company
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