Semipermeable membranes prepared from polymers containing pendent sulfone groups
First Claim
1. A semipermeable membrane useful for the separation of gases from a mixture containing at least two fractions into enriched fractions of each, the membrane formed from at least one polymer containing a preponderance of arylene units of the formula ##STR8## where each R is independently a C1 -C8 aliphatic or a C5 -C7 cycloaliphatic hydrocarbon radical, an aryl radical, an aralkyl radical or an alkaryl radical, each radical being free of a tertiary alpha-carbon atom;
- each Q is a radical of the formula ##STR9## where R'"'"' is a C1 -C20 linear or branched hydrocarbon;
X is a divalent oxygen or sulfur atom or a carbonate group;
m is an integer of 0-2; and
n is 0-1 with the proviso that n is 1 in at least 10 percent of the arylene units of the polymer.
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Accused Products
Abstract
Semipermeable membranes useful for the separation of gases from a mixture containing at least two fractions into enriched fractions of each, the membrane formed from at least one polymer containing a preponderance of arylene units of the formula ##STR1## where each R is independently a C1 -C8 aliphatic or a C5 -C7 cycloaliphatic hydrocarbon radical, an aryl radical, an aralkyl radical or an alkaryl radical, each radical being free of a tertiary alpha-carbon atom; each Q is a radical of the formula ##STR2## where R'"'"' is a C1 -C20 linear or branched hydrocarbon or a nonpolymeric aryl radical; X is a divalent oxygen or sulfur atom or a carbonate group; m is an integer of 0-2; and n is 0-1 with the proviso that n is 1 in at least 10 percent of the arylene units of the polymer. A process is also provided whereby a mixture of gases is separated with the foregoing semipermeable membrane.
21 Citations
20 Claims
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1. A semipermeable membrane useful for the separation of gases from a mixture containing at least two fractions into enriched fractions of each, the membrane formed from at least one polymer containing a preponderance of arylene units of the formula ##STR8## where each R is independently a C1 -C8 aliphatic or a C5 -C7 cycloaliphatic hydrocarbon radical, an aryl radical, an aralkyl radical or an alkaryl radical, each radical being free of a tertiary alpha-carbon atom;
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each Q is a radical of the formula ##STR9## where R'"'"' is a C1 -C20 linear or branched hydrocarbon;
X is a divalent oxygen or sulfur atom or a carbonate group;m is an integer of 0-2; and n is 0-1 with the proviso that n is 1 in at least 10 percent of the arylene units of the polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In a process for the separation of gases from a mixture containing at least two gases into two fractions, one fraction being enriched with at least one of said gases and the other fraction being depleted in same, the process comprising:
contacting the gaseous mixture with a semipermeable membrane in such a manner that a portion of the gaseous mixture selectively passes through the membrane resulting in the enriched fraction being on one side of the membrane and the depleted fraction being on the other side of the membrane, the improvement comprising the use of a semipermeable membrane formed from at least one polymer containing a preponderance of arylene units of the formula ##STR10## where each R is independently a C1 -C8 aliphatic or a C5 -C7 cycloaliphatic hydrocarbon radical, an aryl radical, an aralkyl radical or an alkaryl radical, each radical being free of a tertiary alpha-carbon atom; each Q is a radical of the formula ##STR11## where R'"'"' is a C1 -C20 linear or branched hydrocarbon;
X is a divalent oxygen or sulfur atom or a carbonate group;m is an integer of 0-2; and n is 0-1 with the proviso that n is 1 in at least 10 percent of the arylene units of the polymer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
Specification