Absorption of H₂S by an Aqueous Methyldiethanolamine Solution at 296 and 343 K

An apparatus developed to measure absorption kinetics of acid gases by amine solutions is described as well as the experimental procedures dealing with either the initial kinetics or kinetics for loaded solutions. Data obtained for H 2 S absorption into a 50 mass % methyldiethanolamine (MDEA) aqueous solution with various initial H 2 S loadings are reported for the following conditions: H 2 S loadings from 0 to 0.44 mol H 2 S per mol MDEA and two temperatures, 296 and 343 K. The H 2 S experimental absorption rates have been used together with a model, based on mass transfer and involving an instantaneous reversible reaction, to determine the MDEA diffusion coefficient.