Developing a new correlation for the aliphatic and aromatic hydrocarbon diffusion coefficients at infinite dilution in ionic liquids

Abstract

Medida de los coeficientes de difusión de hidrocarburos aromáticos y alifáticos en el seno de diferentes líquidos iónicos. Propuesta de una nueva correlación empírica como variación a la ecuación de Wilke-Chang.In this work the Taylor dispersion technique has been used to measure the diffusion coefficients of n-heptane and toluene at infinite dilution in four ionic liquids, namely 1-ethyl-3-methylimidazolium thiocyanate ([emim][SCN]), 1-ethyl-3-methylimidazolium tricyanomethanide ([emim][TCM]), 1-butyl-3-methylimidazolium tricyanomethanide ([bmim][TCM]), and 1-butyl-4-methylpyridinium tricyanomethanide ([4bmpy][TCM]), at the range temperatures from (298.2–333.2) K. A new empirical correlation has been proposed as a variation of the Wilke-Chang equation.