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The objective of this work is to improve the process for CO 2 capture by alkanolamine absorption/stripping by developing an alternative solvent, aqueous K 2 CO 3 promoted by piperazine. In Campaign 3 of the pilot plant, the overall mass transfer coefficient for the stripper with 7 m MEA decreased from 0.06 to 0.01 mol/(m 3 .s.kPa) as the rich loading increased from 0.45 to 0.6 mol CO 2 / mol MEA. Anion chromatography has demonstrated that nitrate and nitrite are major degradation products of MEA and PZ with pure oxygen. In measurements with the high temperature FTIR in 7 m MEA the MEA vapor pressure varied from 2 to 20 Pa at 35 to 70 o C. In 2.5 m PZ the PZ vapor pressure varied from 0.2 to 1 Pa from 37 to 70 o C. 4