Heat transfer oil and method for driving a Freon turbine

Claim 1

A heat transfer method for driving a Freon turbine comprising the steps of: (a) transferring heat of a heat source through a heat exchanger of the indirect contact type to an intermediate heat transfer oil, consisting essentially of: (1) a major amount of a polyolester of a reaction product of a polyhydric alcohol selected from the group consisting of neopentylglycol, trimethylolethane, trimethylolpropane and pentaerythritol with a saturated monocarboxylic acid having 7-16 carbon atoms per molecule; (2) at least one member selected from the groups consisting of tris-(alkylphenyl)phosphite and tris-(phenyl)phosphite, and (3) at least one member selected from the group consisting of benzotriazole and benzotriazole derivatives having the formula ##STR30## wherein R 1 and R 2 each represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; whereby said heated intermediate transfer oil gasifies said Freon by contact therewith, said components (2) and (3) being present in an amount sufficient to reduce the generation of chlorine ion; and (b) driving said turbine with said gasified Freon.