The thermodynamics of hydrocarbon solutions from G.L.C. measurements. Part 1.—Solutions in dinonyl phthalate

Abstract

The activity coefficients of eight hydrocarbons in infinitely dilute solution in dinonyl phthalate at 30°C have been evaluated by gas-liquid chromatography (G.L.C.) and compared with values extrapolated from earlier static measurements. When the G.L.C. data are extrapolated to zero flow rate and zero sample size and corrected for gas imperfection, excellent agreer,ent with data obtained by the static technique is observed. The importance of using the correct equation for the gas imperfection correction is stressed, and an approximate method is suggested for deriving the virial coefficients of a mixed vapour from G.L.C. measurements.

Montmorillonite-Organic Complexes—Gas Chromatographic Determination of Energies of Interactions

“…* Everett and Stoddart (1961) have observed that in runs with increasing sample size the initial retention time remains constant while the peak retention time increases. suggesting that the initial retention time is the significant quantity.…”

Activity coefficient at infinite dilution measurements for organic solutes (polar and non-polar) in fatty compounds: Saturated fatty acids

“…All temperature and pressure dependent variables are at the column temperature T and column outlet pressure P o . We assumed that V 1 1 % V Ã 1 , as suggested by Everett and Stoddart [27].…”

Excess thermodynamic functions

“…Thus the simplest class of nonideal mixtures is that for which ξ 29 and all higher coefficients in equations (5.1) and (5.2), vanish over a non-zero range of p and T. Such a system is often called a regular mixture, although many other meanings have been given to that over-worked adjective. It is seen that the lowest power of x 2 in the expansion for μ Ε is the second.…”

“…This has been known for many years, but only recently have columns been built which are sufficiently flexible in their operating conditions to allow all the minor corrections to be measured precisely 29 . Briefly, in an ideal column the activity coefficient is inversely proportional to the product of the vapour pressure and retention volume of the volatile component.…”