US 11,772,053 B2
Carbon molecular sieve membranes containing a group 13 metal and method to make them
Yu-Han Chu, Beaverton, OR (US); William J. Koros, Atlanta, GA (US); Liren Xu, Freeport, TX (US); Mark K. Brayden, Plaquemine, LA (US); and Marcos V. Martinez, Freeport, TX (US)
Assigned to Dow Global Technologies LLC, Midland, MI (US); and Georgia Tech Research Corporation, Atlanta, GA (US)
Filed by Dow Global Technologies LLC, Midland, MI (US); and Georgia Tech Research Corporation, Atlanta, GA (US)
Filed on Oct. 27, 2022, as Appl. No. 17/974,786.
Application 17/974,786 is a continuation of application No. 16/758,114, granted, now 11,504,675, previously published as PCT/US2018/036597, filed on Jun. 8, 2018.
Claims priority of provisional application 62/578,558, filed on Oct. 30, 2017.
Prior Publication US 2023/0088542 A1, Mar. 23, 2023
Int. Cl. B01D 53/22 (2006.01); B01D 71/02 (2006.01); B01D 67/00 (2006.01); B01D 69/14 (2006.01)
CPC B01D 71/021 (2013.01) [B01D 53/228 (2013.01); B01D 67/0067 (2013.01); B01D 67/0076 (2013.01); B01D 69/141 (2013.01); B01D 71/022 (2013.01); B01D 67/0011 (2013.01)] 14 Claims
 
1. A process for separating a gas molecule from a feed gas comprised of the gas molecule and at least one other gas molecule, the process comprising:
(i) providing a carbon molecular sieve membrane comprising, carbon, a group 13 metal, and at most a trace amount of sulfur, wherein the group 13 metal is present in a reduced state, and wherein the group 13 metal is present in an amount of 0.5% to 10% by weight of the carbon molecular sieve membrane; and
(ii) flowing the gas feed through and over said carbon molecular sieve membrane to produce a first permeate stream having an increased concentration of the gas molecule and a second retentate stream having a decreased concentration of the gas molecule,
wherein the gas molecule is propylene and the at least one other gas molecule comprises ethane, and wherein the carbon molecular sieve membrane has a permeance of propylene of at least 10 GPU.