US 11,992,814 B2
Asymmetric modified carbon molecular sieve hollow fiber membranes having improved permeance
Nitesh Bhuwania, Atlanta, GA (US); William John Koros, Atlanta, GA (US); and Paul Jason Williams, Richmond, TX (US)
Assigned to GEORGIA TECH RESEARCH CORPORATION, Atlanta, GA (US); and AIR LIQUIDE ADVANCED TECHNOLOGIES U.S., LLC, Newark, DE (US)
Filed by Georgia Tech Research Corporation, Atlanta, GA (US); and AIR LIQUIDE ADVANCED TECHNOLOGIES U.S., LLC, Newark, DE (US)
Filed on Aug. 20, 2021, as Appl. No. 17/407,465.
Application 17/407,465 is a continuation of application No. 15/812,025, filed on Nov. 14, 2017, granted, now 11,123,693.
Application 15/812,025 is a continuation of application No. 14/501,884, filed on Sep. 30, 2014, granted, now 9,815,030, issued on Nov. 14, 2017.
Claims priority of provisional application 61/884,548, filed on Sep. 30, 2013.
Prior Publication US 2021/0379538 A1, Dec. 9, 2021
Int. Cl. B01D 71/02 (2006.01); B01D 53/22 (2006.01); B01D 67/00 (2006.01); B01D 69/08 (2006.01)
CPC B01D 71/021 (2013.01) [B01D 53/228 (2013.01); B01D 67/0067 (2013.01); B01D 69/08 (2013.01); B01D 2323/12 (2013.01); B01D 2325/20 (2013.01); Y02C 20/20 (2013.01)] 20 Claims
 
1. A process for preparing a thermally rearranged polymer material having improved gas separation performance properties comprising:
a. providing a polymer precursor material comprising a polyimide with an ortho-positioned functional group,
b. contacting the polymer precursor material with a solution comprising a modifying agent and a non-aqueous solvent, wherein the modifying agent is
a compound having the general formula R1R2R3R4Si, where each of R1, R2, R3, and R4 are independently C1-C6 alkyl or alkenyl, alkoxy, or halogen; with the proviso that the compound contains at least one C1-C6 alkyl or alkenyl substituent and at least one alkoxy or halogen substituent, or
a compound having the general formula R1R2R3R4M, where M is a metal and where each of R1, R2, R3, and R4 are independently C1-C6 alkyl or alkenyl, alkoxy, or halogen, with the proviso that the compound contains at least one C1-C6 alkyl or alkenyl substituent and at least one alkoxy or halogen substituent,
c. contacting the polymer precursor material of step b. with a moisture-containing atmosphere to form a treated polymer precursor material, and
d. heating the treated polymer precursor material to form a thermally rearranged polymer.