US 11,724,230 B2
Multilayer aromatic polyamide thin-film composite membranes for separation of gas mixtures
Seung-Hak Choi, Dhahran (SA); Mohammad S. Al-Qahtani, Dhahran (SA); and Eyad A. Qasem, Dhahran (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on May 8, 2020, as Appl. No. 16/870,577.
Application 16/870,577 is a continuation of application No. 15/644,005, filed on Jul. 7, 2017, granted, now 10,682,606.
Prior Publication US 2020/0368678 A1, Nov. 26, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. B01D 53/22 (2006.01); B01D 53/26 (2006.01); B01D 69/12 (2006.01); B01D 71/56 (2006.01); B01D 71/64 (2006.01); B01D 71/68 (2006.01); B01D 71/82 (2006.01); B01D 67/00 (2006.01); B01D 69/02 (2006.01); B01D 71/52 (2006.01)
CPC B01D 53/228 (2013.01) [B01D 53/268 (2013.01); B01D 67/0088 (2013.01); B01D 69/02 (2013.01); B01D 69/12 (2013.01); B01D 69/125 (2013.01); B01D 71/56 (2013.01); B01D 71/64 (2013.01); B01D 71/68 (2013.01); B01D 71/82 (2013.01); B01D 71/52 (2013.01); B01D 2053/223 (2013.01); B01D 2256/10 (2013.01); B01D 2256/22 (2013.01); B01D 2256/245 (2013.01); B01D 2257/108 (2013.01); B01D 2257/11 (2013.01); B01D 2311/04 (2013.01); B01D 2325/04 (2013.01); B01D 2325/20 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A gas separation membrane comprising:
a hollow fiber membrane comprising:
a porous support layer with a thickness between 30 μm and 100 μm;
an aromatic polyamide layer with a thickness between 20 nm and 200 μm formed on the porous support layer via interfacial polymerization; and
a coating with a thickness of less than 1 μm comprising a glassy polymer formed on the aromatic polyamide layer and that plugs defects in the aromatic polyamide layer, wherein a glass transition temperature of the glassy polymer is greater than 50° C., and wherein the hollow fiber membrane has a selectivity of helium over carbon dioxide greater than 40 after coating,
wherein the glassy polymer is poly(phenylene oxide).