Removal of carbon dioxide from gases by aqueous amine solutions containing a sterically hindered amine

摘要

A method for removing acid gases from a fluid flow using an absorbent including an aqueous solution with at least two different amines. An amine in a proportion of greater than 50 wt. % of the total amine amount in the aqueous solution is the first amine component in the aqueous solution, and a sterically hindered amine in a proportion of less than 50 wt. % is the second amine component in the aqueous solution. The fluid flow is brought into contact with the absorbent at a partial pressure of <200 mbar.

主权项

1. A method for absorbing sour gases from a fluid stream comprising:
providing an absorbent aqueous solution with an amine component, the amine component consisting essentially of, a first amine component selected from the group consisting of piperazine, 1,3-diaminopropane, and mixtures thereof, the first amine component being 70-85 wt. % of the total amine content of the aqueous solution, and a second amine component consisting of one or more sterically hindered amines in an amount of from 15-30 wt. % of the total amine content of the aqueous solution, and bringing the fluid stream into contact with the absorbent at a partial pressure of the sour gases of <200 mbar in the fluid stream, absorbing the sour gases and producing an absorbent laden with sour gases.