Solubility of Carbon Dioxide in Aqueous Mixtures of DIPA + MDEA and DIPA + PZ Solutions

Abstract

The new data for solubility of carbon dioxide are reported in mixed solvents containing (2.00 to 2.50 kmol/m3) Diisopropanolamine (DIPA), (0.86 to 1.36) kmol/m3) Piperazine (PZ), (0.86 to 1.36) kmol/m3) N-methyldiethanolamine (MDEA) and water, keeping the amine total concentration in the aqueous solution at 3.36 kmol/m3 for temperatures from (40 to 70) °C and CO2 partial pressures in the range of (30 to 5000) kPa. Experimental solubility results were represented by the mole ratio of CO2 per total amine in the liquid mixture. Results show that at a given partial pressure of CO2 the solubility of CO2 in the DIPA solutions is lower than solubility in MDEA or PZ solutions and the CO2 loading increased with decreasing temperature and increasing CO2 partial pressure.