Experimental study on CO capture by MEA/-butanol/HO phase change absorbent

Monoethanolamines (MEAs) are widely used for CO 2 capture, but their regeneration energy consumption is very high. CO 2 Phase change absorbents (CPCAs) can be converted into CO 2 -rich and CO 2 -lean phases after absorbing CO 2 , and the regeneration energy consumption can be reduced because only the CO 2 -rich phase is thermally desorbed. In this paper, a novel CPCA with the composition "MEA/ n -butanol/H 2 O (MNBH)" is proposed. Compared with the reported MEA phase change absorbent, the MNBH absorbent has higher CO 2 absorption capacity, smaller absorbent viscosity and CO 2 -rich phase volume. The MNBH absorbent has the highest CO 2 absorption capacity of 2.5227 mol CO 2 per mol amine at a mass ratio of 3 : 4 : 3. The CO 2 desorption efficiency reaches 89.96% at 120 °C, and the CO 2 regeneration energy consumption is 2.6 GJ tCO 2 −1 , which is about 35% lower than that of the 30 wt% MEA absorbent. When the mass ratio of MNBH absorbent was 3 : 6 : 1, the CO 2 recycling capacity was 4.1918 mol CO 2 L −1 , which is 76% higher than that of the conventional 30 wt% MEA absorbent. The phase change absorbent developed in this paper can reduce the desorbent volume by about 50% and has good absorption performance for CO 2 in flue gas. Monoethanolamines (MEAs) are widely used for CO 2 capture, but their regeneration energy consumption is very high.