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A correlation for predicting diffusion coefficients in alkanes
Author(s) -
Erkey C.,
Rodden J. B.,
Akgerman A.
Publication year - 1990
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450680418
Subject(s) - alkane , solvent , chemistry , thermodynamics , diffusion , correlation , volume (thermodynamics) , molar volume , analytical chemistry (journal) , hydrocarbon , chromatography , organic chemistry , mathematics , physics , geometry
A correlation was developed for predicting limiting mutual diffusion coefficients of gaseous and liquid solutes in normal alkane solvents with carbon numbers ranging from 7 to 28 at temperatures to 570 K. The functional form of the correlation is based on the rough hard sphere theory. The parameters needed in the correlation are the molecular weights and hard sphere diameters of the solute and solvent molecules and molar volume of the solvent. The data used in the development of the correlation included 143 measurements with solute/solvent molecular mass ratios ranging from 0.005 to 2.26 and size ratios ranging from 0.3 to 1.3. The average absolute error in predictions was only 6.3%. When the correlation was used to predict literature values for binary n ‐alkane systems, the average absolute error was 16.7%.