Open AccessDiffusion Coefficients of CO2 and N2 in Water at Temperatures between 298.15 K and 423.15 K at Pressures up to 45 MPa
Author(s) -
Shane P. Cadogan,
Geoffrey C. Maitland,
J. P. Martin Trusler
Publication year - 2014
Publication title -
journal of chemical and engineering data/journal of chemical and engineering data
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.719
H-Index - 132
eISSN - 1520-5134
pISSN - 0021-9568
DOI - 10.1021/je401008s
Subject(s) - chemistry , taylor dispersion , thermodynamics , diffusion , analytical chemistry (journal) , dispersion (optics) , range (aeronautics) , chromatography , physics , materials science , optics , composite material
We report measurements of the diffusion coefficients of CO2 and N2 in pure water at temperatures between (298.15 and 423.15) K and pressures between (15 and 45) MPa. The measurements were made by the Taylor dispersion method and have a standard relative uncertainty of 2.3 %. The results were found to be essentially independent of pressure over the range investigated and a simple relation, based on the Stokes–Einstein equation, is proposed to correlate the experimental data. Some experimental difficulties arising in the measurement of the diffusivities of slightly soluble acid-gas solutes such as CO2 in water are also discussed