High selectivity poly(imide-urethane) membranes for gas separations
AssigneeUop LLC
InventorChunqing Liu
Life of this patent
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Abstract
This invention pertains to high selectivity poly(imide-urethane) membrane and a method of making the same. This invention also pertains to applications of the high selectivity poly(imide-urethane) membranes not only for a variety of gas separations such as separations of carbon dioxide/methane, hydrogen/methane, helium/methane, oxygen/nitrogen, carbon dioxide/nitrogen, olefin/paraffin, iso/normal paraffins, xylenes, polar molecules such as water, hydrogen sulfide and ammonia/mixtures with methane, nitrogen, or hydrogen and other light gases separations, but also for liquid separations such as pervaporation and desalination.
Claims20
A poly(imide-urethane) membrane comprising:
- a high selectivity poly(imide-urethane) membrane described in the present invention comprises poly(imide-urethane) polymer with a plurality of repeating units of formula (I):
A process of making a high selectivity poly(imide-urethane) membrane, comprising:
- preparing an organic solution consisting of certain mole ratio of an organo diisocyanate and a polyimide comprising hydroxyl functional groups that can react with the isocyanate groups;
- forming a poly(imide-urethane) pre-polymer solution by allowing the two chemicals to react for at least 4 hours at about 30° C. to about 150° C.;
- coating the poly(imide-urethane) pre-polymer solution on a porous polymeric membrane substrate or on a polymeric cloth substrate or on a clean glass plate;
- removing the organic solvents from the coating layer to form a membrane;
- and
- drying and curing the poly(imide-urethane) pre-polymer membrane to form poly(imide-urethane) polymer membrane.
A process of using a high selectivity poly(imide-urethane) membranes for separating at least one gas from a mixture of gases, the process comprising:
- providing a high selectivity poly(imide-urethane) membrane which is permeable to said at least one gas;
- contacting the mixture on one side of the high selectivity poly(imide-urethane) membrane described in the present invention to cause said at least one gas to permeate the membrane;
- and
- removing from the opposite side of the membrane a permeate gas composition comprising a portion of said at least one gas which permeated said membrane.
Dependencies are inferred from the claim text.