CO2 Capture by Absorption with Potassium Carbonate

Rochelle, Gary T. ; Chen, Eric ; Oyenekan, Babatunde ; Sexton, Andrew ; Davis, Jason ; Hilliard, Marcus ; Veawab, Amorvadee

University of Texas at Austin

关键词: Corrosion;    Removal;    Gypsum;    Carbon Steels;    Amines;   

DOI  :  10.2172/889472
RP-ID  :  none
RP-ID  :  FC26-02NT41440
RP-ID  :  889472

美国|英语

来源: UNT Digital Library

【 摘 要 】

The objective of this work is to improve the process for CO{sub 2} capture by alkanolamine absorption/stripping by developing an alternative solvent, aqueous K{sub 2}CO{sub 3} promoted by piperazine. The pilot plant data have been reconciled using 17% inlet CO{sub 2}. A rate-based model demonstrates that the stripper is primarily controlled by liquid film mast transfer resistance, with kinetics at vacuum and diffusion of reactants and products at normal pressure. An additional major unknown ion, probably glyoxylate, has been observed in MEA degradation. Precipitation of gypsum may be a feasible approach to removing sulphate from amine solutions and providing for simultaneous removal of CO{sub 2} and SO{sub 2}. Corrosion of carbon steel in uninhibited MEA solution is increased by increased amine concentration, by addition of piperazine, and by greater CO{sub 2} loading.