Patent ID: 6165433
Filing Date: 2000-12-26
Classification: B01D,C01B,Y02C,Y02P

Abstract:
A method for recovering carbon dioxide comprising:(A) passing feed gas comprising carbon dioxide at a partial pressure of 10 psia or less in mass transfer contact with a recovery solvent comprising water, from 5 to 35 weight percent of at least one fast reaction rate amine, and from 5 to 50 weight percent of at least one slow reaction rate amine;(B) passing carbon dioxide from the feed gas to the recovery solvent to produce carbon dioxide depleted gas and carbon dioxide loaded recovery solvent;(C) separating carbon dioxide from the carbon dioxide loaded recovery solvent to produce carbon dioxide rich fluid; and(D) recovering carbon dioxide rich fluid as product carbon dioxide wherein the carbon dioxide loaded recovery solvent additionally contains dissolved oxygen, and further comprising deoxygenating the carbon dioxide loaded recovery solvent prior to the separation of step (C).