Absorption of Carbon Dioxide into I) Aqueous Solutions of N,N-dimethylethanolamine II) Aqueous Blends of Mono and Diethanolamine with N,N-dimethylethanolamine

N. Daneshvar, D. Salari, H. Zamzami, M. Zarei and S. Aber

Abstract
Absorption rates of CO2 into aqueous solutions of N,N-dimethylethanolamine (DMEA) and blends of monoethanolamine (MEA) and diethanolamine (DEA) with DMEA were measured in a stirred cell and atmospheric pressures. The influence of gas flow rate, temperature and liquid concentration on the absorption rates of CO2 into aqueous solutions of DMEA, was studied. The results show that the absorption rate of CO2 increases with increasing gas flow rate (3–7 L min–1), liquid temperature (16–32 °C), and solvent concentration (1.11–3.24mol L–1). In the next step, small amounts of MEA and DEA were added to DMEA solutions, and the absorption of CO2 into these blends was studied. The results show that the addition of small amounts of MEA and DEA to DMEA solutions results in a significant enhancement of CO2 absorption rates.

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Keywords
Gas absorption, Carbon dioxide, N,N-dimethylethanolamine, mixed amines