Separation membrane
AssigneeNitto Denko Corporation
InventorsKazuya Yoshimura, Hisae Shimizu, Makoto Katagiri
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Abstract
The present invention provides a separation membrane suitable for separating water from a liquid mixture containing an alcohol and water, the separation membrane being capable of reducing a decrease in separation performance regardless of long-term use. A separation membrane 10 of the present invention includes a polyimide having a structural unit X represented by the following formula (1) and a structural unit Y represented by following formula (2). A1 is a linking group including no arylene group in a main chain and having a solubility parameter, in accordance with a Fedors method, of more than 5.0 (cal/cm3)1/2. A2 is a tetravalent organic group including an arylene group.
Claims11
A separation membrane for separating water from a liquid mixture containing an alcohol and water, the separation membrane comprising:
- a polyimide, wherein
- the polyimide has a structural unit X represented by the following formula (1) and a structural unit Y represented by the following formula (2):
- in the formula (1), A1 is a linking group including no arylene group in a main chain and having a solubility parameter, in accordance with a Fedors method, of more than 5.0 (cal/cm3)1/2, B1 is a divalent organic group, and R1 to R6 are each independently a hydrogen atom, a halogen atom, a hydroxyl group, a sulfonic acid group, an alkoxy group having 1 to 30 carbon atoms, or a hydrocarbon group having 1 to 30 carbon atoms, and
- in the formula (2), A2 is a tetravalent organic group including an arylene group and B2 is a divalent organic group.
Dependencies are inferred from the claim text.