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

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 estimate...

Full description

Saved in:
Bibliographic Details
Published in:Analytical chemistry (Washington) 1997-07, Vol.69 (13), p.2530-2536
Main Authors: Li, Jianwei, Carr, Peter W
Format: Article
Language:English
Subjects:
Acetophenones - chemistry
Alkylation
Benzene Derivatives - chemistry
Chemistry
Diffusion
Exact sciences and technology
General and physical chemistry
Ketones - chemistry
Solution properties
Solutions
Solvents - chemistry
Temperature
Viscosity
Water
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 than 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.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac961005a