초록

Carbon dioxide is removed from CO2 and hydrocarbon containing gaseous streams. In the instance where the hydrocarbons and CO2 are such that hydrocarbons would condense out during CO2 removal, the gas stream is treated in one or more stages to accomplish hydrocarbon composition control.

대표청구항 ▼

Process for treating a gaseous stream comprising hydrocarbons and CO2 comprising (a) separating a portion of hydrocarbons from the gaseous stream to produce a first stream; (b) separating CO2 from the first stream in a first CO2 absorption zone by absorption in a first solution effective for CO2 rem

Process for treating a gaseous stream comprising hydrocarbons and CO2 comprising (a) separating a portion of hydrocarbons from the gaseous stream to produce a first stream; (b) separating CO2 from the first stream in a first CO2 absorption zone by absorption in a first solution effective for CO2 removal to produce a hydrocarbon enriched second stream; (c) further separating CO2 from the second stream in at least a second CO2 absorption zone by absorption in a second solution effective for CO2 removal to produce a further hydrocarbon enriched third stream, wherein the gaseous stream comprises CO2 and hydrocarbons such that in the absence of step (a) hydrocarbon condensation due to hydrocarbon dewpoint temperature increase occurs as CO2 is removed in at least one of steps (b) and (c), and wherein the first solution comprises an aqueous tertiary alkanolamine solution; and the second solution comprises an aqueous alkanolamine solution selected from the group consisting of aqueous secondary alkanolamine solutions and aqueous primary alkanolamine solutions.