US 12,083,474 B2
Stacked membranes and their use in gas separation
Ali Hayek, Dhahran (SA); Yasser A. Shalabi, Dhahran (SA); Seung-Hak Choi, Dhahran (SA); and Abdulkarim Alsamah, Dhahran (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Dec. 15, 2021, as Appl. No. 17/551,519.
Prior Publication US 2023/0182070 A1, Jun. 15, 2023
Int. Cl. B01D 53/22 (2006.01); B01D 63/02 (2006.01); B01D 63/08 (2006.01); B01D 71/64 (2006.01); C10L 3/10 (2006.01)
CPC B01D 53/228 (2013.01) [B01D 63/02 (2013.01); B01D 63/082 (2013.01); B01D 71/64 (2013.01); C10L 3/103 (2013.01); C10L 3/104 (2013.01); C10L 2290/548 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A membrane system, comprising:
a first membrane; and
a second membrane,
wherein, at a temperature and pressure:
the first membrane has a permeation rate for a first gas and a selectivity for a gas mixture comprising the first gas a second gas different from the first gas;
the second membrane has a permeation rate for the first gas and a selectivity for the gas mixture;
the permeation rate of the first membrane is greater than the permeation rate of the second membrane; and
the selectivity of the second membrane is greater than the selectivity of the first membrane; and
wherein at least one of the following holds:
the selectivity of the membrane system at a pressure of 1,100 psi is within 30% of the selectivity of the membrane system at a pressure of 500 psi; and
the selectivity of the membrane system at a pressure of 700 psi is within 30% of the selectivity of the membrane system at a pressure of 500 psi.