Gas purification apparatus and method
An integrated amine and redox gas treatment system is configured to treat an influent hydrocarbon containing stream. The system includes a reduction oxidation unit connected directly downstream of an amine unit. The amine unit is configured to separate the influent fluid stream into a first amine effluent stream including hydrocarbons and a second amine effluent stream including a connection pressure and comprising CO 2 . The reduction oxidation unit is configured to receive the second amine effluent stream from the amine unit and operate at the connection pressure while releasing a reduction oxidation effluent stream including purified CO 2 . The connection pressure includes a single pressure or a plurality of pressures at which both the amine unit and the reduction oxidation unit are configured to operate.
1. A method of purifying CO 2 from a hydrocarbon containing gas stream, the method comprising:
operating an amine regeneration unit to regenerate a contacted amine reagent;
releasing, from the amine regeneration unit, an amine effluent fluid stream including CO 2 ;
contacting, in a redox contactor connected downstream of the amine regeneration unit, the amine effluent fluid stream with a reducing reagent; and
releasing a purified CO 2 stream from the redox contactor, the purified CO 2 stream including CO 2 resulting from only the amine effluent stream.
2. The method of claim 1 , wherein contacting in the redox contactor further comprises:
contacting the reducing reagent and the amine effluent fluid stream in both a co-current direction and a countercurrent direction within the redox contactor.
3. The method of claim 1 , wherein releasing from the amine regeneration unit the amine effluent fluid stream including CO 2 , further comprises:
releasing from the amine regeneration unit the amine effluent fluid stream including CO 2 , water vapor, or any combination thereof; and
condensing the water vapor in the amine effluent fluid stream using a water separation unit.
4. The method of claim 1 , wherein contacting, in the redox contactor connected downstream of the amine regeneration unit, the amine effluent fluid stream with the reducing reagent further comprises:
using the reducing reagent including ferric salts, ferrous salts, ferric chelants, ferrous chelants, Fe-MGDA, HEME, organisms containing HEME, or any combination thereof.
5. The method of claim 1 , further comprising:
operating, at a connection pressure, amine regeneration unit to regenerate a contacted amine reagent; and
operating the redox contactor, at the connection pressure, while contacting the amine effluent fluid stream with a reducing reagent,
wherein the connection pressure includes a single pressure or a plurality of pressures at which both the amine regeneration unit and the redox contactor are configured to operate.