Patent ID: 8454724
Filing Date: 2013-06-04
Classification: B01D,Y02C,Y02E

Abstract:
1. A system for treating a feed gas stream, containing an undesirable amount of CO 2 comprising: (a) a pre-membrane unit comprising a membrane and having a feed side and a residue side; (b) a first gas flow line connected to the feed side of the pre-membrane unit for transferring a feed gas stream to the feed side of the pre-membrane unit wherein said feed gas stream has variable flow rates from 50 to 210 MMSCFD and CO (c) a primary membrane unit comprising a membrane and having a feed side and a residue side; (d) a second gas flow line connecting the residue side of the pre-membrane unit to the feed side of the primary membrane unit for transferring a first residual gas stream from the residue side of the pre-membrane unit to the feed side of the primary membrane unit; (e) a first bypass around the pre-membrane unit, wherein the first bypass connects the first gas flow line to the second gas flow line to allow at least partial bypass of the feed gas stream around the pre-membrane unit; and (f) a second bypass around the primary membrane unit, wherein the second bypass connects the second gas flow line to a third gas flow line connected to the residual side of the primary membrane unit to allow at least partial bypass of the first residual gas stream around the primary membrane unit; wherein said primary membrane unit is smaller than said pre-membrane unit.