Accuracy of Empirical Correlations for Estimating Diffusion Coefficients in Aqueous Organic Mixtures

Jianwei Li, Peter W Carr

Research output: Contribution to journalArticlepeer-review

192 Scopus citations

Abstract

Diffusion coefficients for a homologous series of alkylbenzenes and alkylphenones have been measured by the Aris-Taylor open tube method from 30 to 60°C over a wide range in methanol/water and acetonitrile/water compositions (10-100% by volume of organic). The measurements were compared to estimates derived from five of the most common empirical correlations. The errors for methanolic mixtures by the Wilke-Chang, Scheibel, and Lusis-Ratcliff correlations are usually less than 20%. The Scheibel, Wilke-Chang, and Hayduk-Laudie correlations work better man others for acetonitrile/water mixtures. Overall, the Scheibel correlation shows the smallest errors, and we recommend its use to that of the more widely used Wilke-Chang method for the systems studied here. We have also developed fitting equations for estimating viscosity so that the diffusion coefficients can be easily estimated.

Original languageEnglish (US)
Pages (from-to)2530-2536
Number of pages7
JournalAnalytical Chemistry
Volume69
Issue number13
DOIs
StatePublished - Jul 1 1997

Fingerprint

Dive into the research topics of 'Accuracy of Empirical Correlations for Estimating Diffusion Coefficients in Aqueous Organic Mixtures'. Together they form a unique fingerprint.

Cite this