5 The following is a bibliography of some of the more recent work in which the thermal production and reactions of free radicals are studied: (a) Taylor, Am.

In the course of the development of the naphtha isomerization process1•2 the equilibrium constants for the isomeric hexanes were determined. Although the equilibrium constants for butanes and pentanes3•4 have been repeatedly investigated, few experimental data have appeared for the hexanes.Two papers5•6 have appeared on the direct experimental determination of the equilibrium constants for the hexanes but they were limited to 25 and 80°, respectively. The hexane equilibria were calculated over a wide range of temperatures from the precise measurements of the heats of combustion and best available entropy data.7 In the present investigation the hexane equilibria were studied directly over the temperature range 21 to 204°and side reactions were reduced to a minimum by the use of hydrogen and cyclic decomposition inhibitors. The experiments were carried out on a fraction of Mid-Continent light naphtha containing both Cfi and Ce hydrocarbons.Packing gland (see detail)(1) B.

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