Effect of solute concentration on the diffusivity of carbon dioxide in water |
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| Affiliation: | 1. Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL-30239 Krakow, Poland;2. Department of Chemistry, Aalto University, P.O. Box 16100, 00076 Aalto, Finland;1. Centre for Energy Technology, Schools of Chemical Engineering, The University of Adelaide, South Australia, 5005, Australia;2. Mechanical Engineering, The University of Adelaide, South Australia, 5005, Australia;1. Department of Chemical Engineering, Materials and Environment, Sapienza University, Roma, Italy;2. Department of Anatomical, Histological, Forensic and Locomotor Apparatus Sciences, Sapienza University, Roma, Italy |
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| Abstract: | When a gas diffuses in a liquid under normal conditions, and the concentration of the diffusing gas is small, the general practice is to assume a constant diffusion coefficient. Recent work on the CO2-water system reported that the “integral” diffusion coefficient of CO2 decreased about 30 per cent when the initial concentration of CO2 was increased from 0 to 60 per cent of the equilibrium value.A careful study in a liquid jet has been made of the diffusion of CO2 in water at 25°C as a function of solute concentration to test the reported results. While a slight variation of diffusivity may have been observed, it was not statistically significant; for all practical purposes the diffusion coefficient of CO2 in water can be considered to be constant. |
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