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

Author: Morton D.W.   Young C.L.  

Publisher: Academic Press

ISSN: 0021-9614

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

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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

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