Refrigerant compositions

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 5/04 (2006.01)

Patent

CA 2501824

Refrigerant composition are disclosed which comprises: (a) pentafluorethane, trifluoromethoxydifluoromethane or hexafluorocyclopropane, or a mixture of two or more thereof, in an amount of at least 75% based on the weight of the composition, (b) 1,1,1,2- or 1,1,2,2-tetrafluoroethane, trifluoromethoxypentafluoroethane, 1,1,1,2,3,3-heptafluoropropane or a mixture of two or more thereof, in an amount of from 10 to 20 % by weight based on the weight of the composition and (c) an ethylenically unsaturated or saturated hydrocarbon, optionally containing one or more oxygen atoms, with a boiling point from -50 ~C to +35 ~C, or a mixture thereof in an amount from 1 % to 4 % by weight based on the weight of the composition the weight ratio of component (a): component (b) being at least 4:1.

L'invention concerne une composition réfrigérante qui comprend: (a) du pentafluoréthane, du trifluorométhoxydifluorométhane ou de l'hexafluorocyclopropane, ou un mélange d'au moins deux de ces composés, à une quantité d'au moins 75 % en fonction du poids de la composition; (b) du 1,1,1,2- ou 1,1,2,2 tétrafluoroéthane, du trifluorométhoxypentafluoroéthane, du 1,1,1,2,3,3-heptafluoropropane ou un mélange d'au moins deux de ces composés, à une quantité comprise entre 10 et 20 % en poids en fonction du poids de la composition; et (c) un hydrocarbure éthylénique non saturé ou saturé, contenant éventuellement un ou plusieurs atomes d'oxygène, dont le point d'ébullition est compris entre -50 ·C et +35 ·C, ou un mélange de celui-ci à une quantité comprise entre 1 % et 4 % en poids en fonction du poids de la composition, le rapport de poids du composant (a): composant (b) étant au moins de 4:1.

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