Abstract
This paper is a continuation of our work reported
previously [1] on the interaction between ester solvents and alkene
volatile organic compounds (VOCs). The interactions were presented
inform of infinite dilution activity coefficients. A Microsoft Excel
spreadsheet for the modified UNIFAC Dortmund group contribution
method [2] was designed and used in computing the required phase
equilibrium. The size of the solvent molecule (biodiesel) relative to
the VOC molecule influenced the thermodynamic interactions. The
degree of ester (biodiesel) bond saturation influenced the ease in
which cyclic VOCs interacted with the solvent compared to their
straight chain counterparts. The location of branches such as methyl
branches in relation to the double-bonded carbons had an impact on
the predicted infinite dilution activity coefficients.