High pressure high CO2 removal configurations and methods
First Claim
1. A method of removing CO2 from a feed gas, comprising:
- contacting the feed gas with a semi-rich solvent upstream of an absorber at a pressure above an absorber operating pressure to produce a two-phase mixture comprising a rich solvent and a partially treated feed gas;
separately cooling the semi-rich solvent and the feed gas prior to producing the two-phase mixture using refrigeration content generated by pressure reduction of the rich solvent; and
flashing the two-phase mixture into a bottom section of an absorber to the absorber operating pressure.
2 Assignments
0 Petitions
Accused Products
Abstract
CO2 is removed from high-pressure feed gas in configurations and methods according to the inventive subject matter by contacting feed gas with cooled semi-rich solvent to form a two-phase mixture that is flashed into the bottom section of an absorber. Rich solvent from the absorber is then reduced in pressure to generate refrigeration for the semi-rich solvent and lean solvent countercurrently contacts the partially treated feed gas in the absorber to produce the semi-rich solvent. Among other advantages, cooling of the feed gas and semi-rich solvent by the pressure reduced rich solvent heats the rich solvent to allow enhanced regeneration of the solvent, and external refrigeration and heating of the solvent can be entirely avoided.
-
Citations
7 Claims
-
1. A method of removing CO2 from a feed gas, comprising:
-
contacting the feed gas with a semi-rich solvent upstream of an absorber at a pressure above an absorber operating pressure to produce a two-phase mixture comprising a rich solvent and a partially treated feed gas; separately cooling the semi-rich solvent and the feed gas prior to producing the two-phase mixture using refrigeration content generated by pressure reduction of the rich solvent; and flashing the two-phase mixture into a bottom section of an absorber to the absorber operating pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification