Membranes comprising aminoalcohols in hydrophilic polymers (LAW522)
OwnerW. S. Winston Hoinventor
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Abstract
The present invention is directed toward a composition comprising a hydrophylic polymer and at least one aminoalcohol, the aminoalcohol being present in an amount ranging from about 10 to 80 wt % based on the total weight of the composition. Another embodiment of the present invention comprises a membrane suitable for use in separating C02 from gas streams containing C02, especially H2 rich gas streams containing C02 and CO.
Claims11
A composition comprising:
- a hydrophilic polymer and at least one aminoalcohol, the aminoalcohol being present in an amount ranging from about 10 to about 80 wt % based on the total weight of the composition wherein the aminoalcohol is selected from aminoalcohols having the formulae:
- 2
- wherein R1, R2 and R3 are hydrogen or alkyl groups having from 1 to 4 carbon atoms, R4 is an alkylene group having from 1 to 4 carbon atoms or an alkyleneimino group of from 3 to 6 carbons and 1 to 2 nitrogen atoms, R5 is an alkylene group having from 2 to 4 carbon atoms or an alkyleneimino group of from 4 to 6 carbons and 1 to 2 nitrogen atoms, rn is an integer ranging from 1 to 4, and n is an integer ranging from 0 to 4.
A process for separating CO2 from a CO2-containing gas stream comprising:
- contacting a CO2-containing gas stream with one side of a non-porous, CO2 selectively permeable membrane comprising a hydrophilic polymer and at least one aminoalcohol, the aminoalcohol being present in an amount ranging from about 10 to about 80 wt % based on the weight of the composition whereby CO2 is selectively transported through the membrane;
- and
- withdrawing from the obverse side of the membrane a permeate containing CO2 where CO2 is selectively removed from the gaseous stream,
A method for producing a nonporous membrane having properties sufficient to enable separation of CO2 from a gaseous stream containing CO2, the method comprising:
- forming a casting solution of a solvent, a hydrophylic polymer and at least one aminoalcohol, the aminoalcohol being present in an amount ranging from about 10 to about 80 wt % based on the total weight of polymer and salt;
- casting the solution on a substrate;
- and
- evaporating the solvent whereby a nonporous membrane is fanned,
Dependencies are inferred from the claim text.