Solubility Study of Carbon Dioxide in Aqueous Amine Solution of Diethyl Monoethanolamine

Abstract

Currently, climate change and global warming are the main issues on environmental concern due to the higher amount of carbon dioxide in the atmosphere. The main sources of carbon dioxide are energy-related activities such as power generation. Now, the effective technology to remove CO₂ from these sources is absorption especially with amine solution. The commercially used amine solutions are monoethanolamine (MEA) and methyldiethanolamine (MDEA). Nevertheless, they also have disadvantages such as low capacity, corrosion and high energy requirement. Therefore, many new solvents have been developed to improve efficiency for CO₂ capture. Consequently, the objective of this work is to measure the solubility of CO₂ in an aqueous solution of 2-(Diethylamino)ethanol (DEAE) as a novel solution at the temperature from 30°C to 80 °C, CO₂ partial pressures ranging from 5 to 100 kPa and solution concentration from 3 to 5 molar. The solubility results of CO₂ in DEAE solution are compared with those of aqueous solution of MEA and MDEA. For cyclic capacity, the results present that DEAE provides higher performance which is up to 856% and 151 % higher than that of MEA and MDEA. respectively. This means that DEAE can save more energy and cost for solution regeneration and makes carbon capture technology viable.