US 12,186,707 B2
Olefins-paraffins separation process by membrane
Puttipong Suwan, Bangkok (TH); Suepsakun Chindapon, Bangkok (TH); Sitthipol Simakajonkiat, Bangkok (TH); and Nattawat Katinhom, Bangkok (TH)
Assigned to PTT Global Chemical Public Company Limited, Bangkok (TH)
Filed by PTT Global Chemical Public Company Limited, Bangkok (TH)
Filed on Sep. 28, 2021, as Appl. No. 17/488,088.
Application 17/488,088 is a continuation of application No. PCT/TH2020/000016, filed on Mar. 17, 2020.
Claims priority of application No. 1901001970 (TH), filed on Mar. 29, 2019.
Prior Publication US 2022/0016575 A1, Jan. 20, 2022
Int. Cl. B01D 61/36 (2006.01); C07C 7/04 (2006.01); C07C 7/144 (2006.01)
CPC B01D 61/3641 (2022.08) [B01D 61/366 (2013.01); C07C 7/04 (2013.01); C07C 7/144 (2013.01); B01D 2311/04 (2013.01); B01D 2311/06 (2013.01); B01D 2311/2669 (2013.01); B01D 2317/025 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An olefins-paraffins separation process in feed stream containing hydrocarbons with 2 to 4 carbon atoms, comprising the following step:
a. feeding the feed stream containing hydrocarbons with 2 to 4 carbon atoms into distillation column and membrane unit, characterized in that said membrane unit comprising at least 2 stages of the membrane unit connected to the distillation column at the feed of the distillation column and at least 2 stages of the membrane unit connected to the side draw of the distillation column, wherein said membrane unit comprising membrane that is specific for olefins; and
b. separating a portion of feed stream that is passed from the membrane unit, wherein at least 1 stream is the product stream that mostly comprising olefins and at least 1 stream that mostly comprising paraffins;
wherein said membrane unit comprises the facilitated transport membrane; and
wherein the weight ratio of the retentate stream which is fed into any stage of the membrane unit to the amount of the retentate stream which is fed into the previous stage of the membrane unit is 50% or more.