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US 9,308,488 B1Granted
High permeability polyimide membranes: gas selectivity enhancement through UV treatment
AssigneeUop LLC
InventorsCarl W. Liskey, Chunqing Liu, Michael B. Hamoy
Life of this patent
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Abstract
Polyimide membranes are provided that provide extremely high permeability. The polyimides do not contain carbonyl or sulfonyl functional groups. These membranes are useful in separating gases including the separation of gas pairs including carbon dioxide/methane, hydrogen/methane and propylene/propane as well as other gas mixtures. The membrane selectivity can be adjusted by exposure to ultraviolet light.
Claims9
A process for separating at least one gas from a mixture of gases comprising providing a UV treated polyimide polymer membrane having a polyimide polymer with a formula
- where m and n are independent integers from 10 to 500 and are in a ratio from 1:10 to 10:1;
- contacting the mixture of gases to one side of the UV treated polyimide polymer membrane to cause at least one gas to permeate said membrane;
- and removing from an opposite side of said UV treated polyimide polymer membrane a permeate gas composition comprising a portion of said at least one gas that permeated said membrane.
Dependencies are inferred from the claim text.