Diffusion coefficients of several aqueous alkanolamine solutions

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Journal of Chemical and Engineering Data; (United States)

DOI:https://doi.org/10.1021/je00011a037· OSTI ID:6298346

Snijder, E D; Riele, M J.M. te; Versteeg, G F; Swaaij, W P.M. van ^[1]

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1. Twente Univ. of Technology, Enschede (Netherlands). Dept. of Chemical Engineering

In absorption processes of acid gases (H[sub 2]S, CO[sub 2], COS) in alkanolamine solutions, diffusion coefficients are used for the calculation of the mass transfer rate. The Taylor dispersion technique was applied for the determination of diffusion coefficients of various systems. Experiments with the system KCl in water showed that the experimental setup provides accurate data. For the alkanolamines monoethanolamine (MEA), diethanolamine (DEA), methyldiethanolamine (MDEA), and di-2-propanolamine (DIPA), correlations for the diffusion coefficient as a function of temperature at different concentrations are given. A single relation for every amine has been derived which correlates the diffusion coefficients as a function of temperature and concentration. The temperature was varied between 298 and 348 K, and the concentration between 0 and 4000-5000 mol/m[sup 3]. Furthermore, a modified Stokes-Einstein relation is presented for the prediction of the diffusion coefficients in the alkanolamines in relation to the viscosity of the solvent and the diffusion coefficient at infinite dilution. The diffusion coefficients at low concentrations are compared with some available relations for the estimation of diffusion coefficients at infinite dilution, and it appears that the agreement is fairly good.

• OSTI ID: 6298346
• Journal Information: Journal of Chemical and Engineering Data; (United States), Journal Name: Journal of Chemical and Engineering Data; (United States) Vol. 38:3; ISSN 0021-9568; ISSN JCEAAX
• Country of Publication: United States
• Language: English

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ALKALI METAL COMPOUNDS
AMINES
AQUEOUS SOLUTIONS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CONCENTRATION RATIO
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TEMPERATURE RANGE 0273-0400 K
VISCOSITY