Refrigerant composition

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 5/04 (2006.01)

Patent

CA 2272961

A non-azeotropic refrigerant composition having a vapour pressure at -20 °C of from 70 to 190 kPa (0.7 to 1.9 bar), at +20 °C of from 510 to 630 kPa (5.1 to 6.3 bar) and at +60 °C of from 1620 to 1740 kPa (16.2 to 17.4 bar), which composition comprises: (a) 1,1,2,2-tetrafluoroethane (R134), 1,1,1,2-tetrafluoroethane (R134a), difluoromethoxytrifluoromethane (E125) or a mixture of two or more thereof, in an amount of from 60 to 99 % by weight, based on the weight of the composition; (b) from 1 to 10 % by weight, based on the weight of the composition, of an unsubstituted hydrocarbon of the formula C n H m in which n is at least 4 and m is at least 2n-2; and, (c) up to 39 % by weight, based on the weight of the composition, of a vapour pressure depressant.

L'invention concerne une composition réfrigérante non azéotropique possédant une pression de vapeur comprise, à -20 DEG C, entre 70 et 190 kPa (de 0,7 à 1,9 bar), à +20 DEG C, entre 510 et 630 kPa (de 5,1 à 6,3 bar) et, à +60 DEG C, entre 1620 et 1740 kPa (de 16,2 à 17,4 bar), et comprenant: (a) entre 60 et 99 % en poids, calculé sur la base du poids de la composition, de 1,1,2,2-tétrafluoroéthane (R134), de 1,1,1,2-tétrafluoroéthane (R134a), de difluorométhoxytrifluorométhane (E125) ou d'un mélange de deux ou de plusieurs d'entre eux; (b) de 1 à 10 % en poids, calculé sur la base du poids de la composition, d'un hydrocarbure non substitué de formule CnHm, où n représente au moins 4 et m, au moins 2n-2; et (c) jusqu'à 39 % en poids, calculé sur la base du poids de la composition, d'un composé susceptible d'abaisser la pression de vapeur.

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