Absorption of Carbon Dioxide in Aqueous Solutions of N-methyldiethanolamine Mixtures

Abstract

idAbstract. Carbon dioxide (CO 2 ) is one of the greenhouse gases (GHG) that has contributed to the global warming problem. Carbon dioxide is produced in large quantity from coal-fired power plants, iron and steel production, cement production, chemical and petrochemical industries, natural gas purification, and transportation. Some efforts to reduce the CO 2 emissions to the atmosphere are then required. Amine-based absorption may be an option for post-combustion capture. The objective of this study is to measure the effect of promoter addition as well as MDEA concentration for the CO 2 absorption into the aqueous solutions of MDEA to improve its performances, i.e. increasing the absorption rate and the absorption capacity. Absorption of CO 2 in aqueous solutions of MDEA mixtures were measured at 40 °C in a bubble tank reactor. The systems tested were the mixtures of 30 wt% MDEA with 5 and 10 wt% BEA and the mixtures of 40 and 50 wt% MDEA with 6 wt% AEEA. It was found that for MDEA-BEA-H 2 O mixtures, the higher the promoter concentraation the higher the CO 2 absorption rate, while for the MDEA-AEEA-H 2 O mixtures, the higher the MDEA concentration the lower the CO 2 absorption rate.

High CO2 absorption in new amine based-transition-temperature mixtures (deep eutectic analogues) and reporting thermal stability, viscosity and surface tension: Response surface methodology (RSM)

“…MDEA has several advantages such as a high CO2 loading capacity (1 mole CO2 per mole of MDEA), low energy requirement for regeneration, lower vapor pressure and corrosiveness, better thermal and chemical stability. 41,42 Therefore, in this study, TTMs were prepared by mixing methyltriphenylphosphonium bromide (MTPPB) as HBA and MDEA as HBD in three molar ratios of 1:7, 1:10 and 1:16 HBA/ HBD. The main objectives of this study are: (1) analysis of the functional groups and hydrogen bonding; (2) investigation of fundamental thermo-physical properties of solvents namely viscosity, surface tension, and thermal stability; and (3) measurement of CO2 solubility.…”