Process for dehydration of gases and composite permeable membranes therefor
First Claim
1. A gas dehydration process comprising contacting a water vapor-containing feed gas with one side of a composite membrane comprising a porous support and an ultrathin layer of a separation barrier of a sulfonated aromatic polymer having an average molecular weight above about 10,000 and a degree of sulfonation -Sm of from about 0.2 to about 2 selected from the group of sulfonated polysulfone or sulfonated polyether ketone having units:
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space="preserve" listing-type="equation">Ar--ywherein Ar is divalent phenylene or divalent biphenylene and y is;
##STR7## permeating water vapor contained in said feed gas through said composite membrane and recovering a nonpermeate water vapor-diminished gas stream and a water enriched permeate stream.
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Abstract
Process for the dehydration of gases using composite permeable membranes, preferably hollow fiber composite membranes comprised of a porous support coated with an ultrathin layer of a defined sulfonated polysulfone or sulfonated polyether ketone. The processes also contemplate the use of a sweep or purge gas on the water-enriched permeate side of the composite membrane to increase the efficiency of the dehydration process.
77 Citations
56 Claims
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1. A gas dehydration process comprising contacting a water vapor-containing feed gas with one side of a composite membrane comprising a porous support and an ultrathin layer of a separation barrier of a sulfonated aromatic polymer having an average molecular weight above about 10,000 and a degree of sulfonation -Sm of from about 0.2 to about 2 selected from the group of sulfonated polysulfone or sulfonated polyether ketone having units:
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space="preserve" listing-type="equation">Ar--ywherein Ar is divalent phenylene or divalent biphenylene and y is;
##STR7## permeating water vapor contained in said feed gas through said composite membrane and recovering a nonpermeate water vapor-diminished gas stream and a water enriched permeate stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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Specification