CO2 solubility in aqueous mixture of MEA, MDEA and DAMP: Absorption capacity, rate and regeneration

The main goal of this research is to investigate the CO2 solubility and regeneration of aqueous solution of methyl diethanolamine (MDEA) and monoethanolamine (MEA) mixed by 1,5-Diamino-2-methylpentane (DAMP) as absorption promoter. In the first step, the absorption capacity and rate of the solutions are experimented in an isothermal batch reactor at various MDEA to MEA ratios, and DAMP concentration. The CO2 cyclic capacity of solutions is investigated by performing CO2 absorption at 30 °C and solvent regeneration at 70 °C. Then, the effect of DAMP concentration on the boiling point, density, mass loading and pH of aqueous mixture of MEA and MDEA is analyzed. The experimental results show that increasing DAMP concentration in the samples increases the absorption rate and capacity of base solution. The results of cyclic absorption and desorption tests show that there is not a considerable difference between cyclic capacity of the base and promoted solutions at 70 °C.