Infinite dilution activity coefficients of C 2 -C 8 hydrocarbons in alkylcyclohexanes

ISSN： 0021-9614

Source： Journal of Chemical Thermodynamics, Vol.30, Iss.2, 1998-02, pp. : 143-151

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

Infinite dilution activity coefficients (gamma 13[infinity]) for mixtures of alkanes (C 3 -C 8 ) in alkylcyclohexanes (C 10 -C 18 ), and alkenes in alkylcyclohexanes (C 10 -C 18 ), are reported. These were determined using gas-liquid chromatography where the alkylcyclohexanes form the stationary phase. A lattice theory for liquids, which has been previously applied to hydrocarbon mixtures, was used to calculate interchange energies from the experimental results. This theory was also applied to existing (cyclohexane+alkane) and (alkane+nonadecylcyclohexane) data with these interchange energies compared with values determined from the gamma 13[infinity] results reported in this work. There was good agreement (1 to 5 per cent) between predicted and experimental gamma 13[infinity] results for (alkane+alkylcyclohexane) mixtures. However, this was found not to be the case for the (alkene+alkylcyclohexane) mixtures where the alkene segment -CH=CH 2 was assumed to behave similarly to the -CH 2 -CH 2 - segment. The differences between experimental and theoretical gamma 13[infinity] values for these types of mixtures were of the order of 30 per cent when using interchange energies derived from (alkane+alkylcyclohexane) mixtures. Copyright 1998 Academic Press Limited