C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
31/43
C09K 5/04 (2006.01)
Patent
CA 1264414
ABSTRACT OF THE DISCLOSURE: The invention relates to heat, transfer compositions for absorption heat pumps, which consist of mixtures of chlorofluorohydrocarbons and solvents, the said mixtures comprising a heat transfer chlorofluorohydrocarbon having from 1 to 3 carbon atoms and being substituted by at least one hydrogen atom, an amide of the type comprising at least one Image bond or a glycolether compound as a solvent, and a sufficient quantity of a stabilizer to inhibit the decomposition of the chlorofluorohydrocarbon and solvents at temperatures ranging up to 180°C, said stabilizer being selected from the group consisting of zinc dialkyl-dithiophosphates of formula: Image in which R' and R", which are identical or different, represent alkyl, aryl, alkylaryl or arylalkyl radicals containing at least 3 carbon atoms, preferably at least 6 carbon atoms; and metal salts of alkylarylsulfonic acids of the formula: (RmAr SO3)nM in which R is an alkyl group having from 1 to 15 carbon atoms, Ar is an aryl group, M is a metal ion, preferably zinc on an alkaline earth metal, m is an integer from 1 to 3 and n is an integer which corresponds to the valency of the metal, with the proviso that when the stabilizer is a metal salt of an alkylarylsulfonic acid, the solvent is not a N-methyl-pyrrolidone. These compositions are stable at temperatures ranging up to 180°C.
485837
Gaz de France
Robic
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