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Title: Solvent-resistant microporous polymide membranes

Abstract

An asymmetric microporous membrane with exceptional solvent resistance and highly desirable permeability is disclosed. The membrane is made by a solution-casting or solution-spinning process from a copolyamic acid comprising the condensation reaction product in a solvent of at least three reactants selected from certain diamines and dianhydrides and post-treated to imidize and in some cases cross-link the copolyamic acid. The membrane is useful as an uncoated membrane for ultrafiltration, microfiltration, and membrane contactor applications, or may be used as a support for a permselective coating to form a composite membrane useful in gas separations, reverse osmosis, nanofiltration, pervaporation, or vapor permeation.

Inventors:
 [1];  [1];  [1]
  1. Bend, OR
Issue Date:
Research Org.:
Bend Research, Inc. (Bend, OR)
Sponsoring Org.:
USDOE
OSTI Identifier:
871407
Patent Number(s):
5725769
Assignee:
Bend Research, Inc. (Bend, OR)
Patent Classifications (CPCs):
C - CHEMISTRY C08 - ORGANIC MACROMOLECULAR COMPOUNDS C08G - MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION
DOE Contract Number:  
FG03-92ER81420; FG03-91ER81230
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
solvent-resistant; microporous; polymide; membranes; asymmetric; membrane; exceptional; solvent; resistance; highly; desirable; permeability; disclosed; solution-casting; solution-spinning; process; copolyamic; acid; comprising; condensation; reaction; product; reactants; selected; diamines; dianhydrides; post-treated; imidize; cross-link; useful; uncoated; ultrafiltration; microfiltration; contactor; applications; support; permselective; coating; form; composite; gas; separations; reverse; osmosis; nanofiltration; pervaporation; vapor; permeation; reverse osmosis; porous membrane; composite membrane; reaction product; gas separation; acid comprising; membrane useful; microporous membrane; highly desirable; /210/95/

Citation Formats

Miller, Warren K, McCray, Scott B, and Friesen, Dwayne T. Solvent-resistant microporous polymide membranes. United States: N. p., 1998. Web.
Miller, Warren K, McCray, Scott B, & Friesen, Dwayne T. Solvent-resistant microporous polymide membranes. United States.
Miller, Warren K, McCray, Scott B, and Friesen, Dwayne T. Thu . "Solvent-resistant microporous polymide membranes". United States. https://www.osti.gov/servlets/purl/871407.
@article{osti_871407,
title = {Solvent-resistant microporous polymide membranes},
author = {Miller, Warren K and McCray, Scott B and Friesen, Dwayne T},
abstractNote = {An asymmetric microporous membrane with exceptional solvent resistance and highly desirable permeability is disclosed. The membrane is made by a solution-casting or solution-spinning process from a copolyamic acid comprising the condensation reaction product in a solvent of at least three reactants selected from certain diamines and dianhydrides and post-treated to imidize and in some cases cross-link the copolyamic acid. The membrane is useful as an uncoated membrane for ultrafiltration, microfiltration, and membrane contactor applications, or may be used as a support for a permselective coating to form a composite membrane useful in gas separations, reverse osmosis, nanofiltration, pervaporation, or vapor permeation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}

Patent:

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