Abstract
Abstract
Absorption by aqueous solutions of alkanolamines is the most mature technology for removing carbon dioxide (СО2) from natural gas, off-gases from power engineering, and other mixtures. The possible presence of oxygen in the gas mixture being treated or air leakage into the absorption treatment system leads to oxidative degradation of the amine and deactivation of the absorption liquid with the formation of a wide range of corrosion-active degradation products. The paper discusses modern views on the effect of dissolved oxygen on the degradation of amine solvents. The main methods for preventing oxidative degradation of alkanolamines and fighting against it are described. Direct removal of oxygen (deoxygenation) from absorption liquids in compact and modular membrane gas–liquid contactors is suggested as an alternative countermeasure. The retrospective and state-of-the-art of membrane deoxygenation of aqueous media are presented. Advanced studies in the field of oxygen removal from amine СО2 solvents used for flue gas treatment are described.
Subject
Geochemistry and Petrology,Energy Engineering and Power Technology,Fuel Technology,General Chemical Engineering,General Chemistry
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