Stabilization of trichlorodifluoro benzenes
AssigneeE. I. Du Pont de Nemours and Company
InventorWalter Mahler
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Abstract
Trichlorodifluorobenzene is thermally stabilized particularly in the presence of engineering metals by contacting it, especially when at temperatures greater than about 200.degree.C, with solid alkaline earth carbonates or with alkali or alkaline earth borates in a sufficient amount. The method is particularly useful in Rankine-cycle engines using trichlorodifluorobenzene as the working fluid, when the stabilizer is contained in the boiler.
Claims7
In a method of heat transfer wherein trichlorodifluorobenzenes are cycled through a thermal gradient including temperatures above about 200.degree.C, the improvement which comprises contacting said trichlorodifluorobenzenes with a thermally stabilizing amount of a solid acid acceptor selected from the group consisting of alkali metal borates, alkali metal phosphates, alkaline earth metal carbonates, alkaline earth metal borates and alkaline earth metal phosphates.
Dependencies are inferred from the claim text.