Compositions of difluoromethane, pentafluoroethane, 1,1,1,2-tetrafluoroethane and hydrocarbons

   
   

The present invention relates to azeotrope-like compression refrigerant compositions consisting essentially of difluoromethane (HFC-32), pentafluoroethane (HFC-125), 1,1,1,2-tetrafluoroethane (HFC-134a) and 0.5-5 weight percent of a hydrocarbon selected from the group consisting of: n-butane; isobutane; n-butane and 2-methylbutane; n-butane and n-pentane; isobutane and 2-methylbutane; and isobutane and n-pentane.

La présente invention concerne azéotrope-comme les compositions réfrigérantes en compression consistant essentiellement en difluoromethane (HFC-32), pentafluoroethane (HFC-125), 1,1,1,2-tetrafluoroethane (HFC-134a) et pour cent de 0.5-5 poids d'un hydrocarbure choisi dans le groupe : n-butane ; isobutane ; n-butane et 2-methylbutane ; n-butane et n-pentane ; isobutane et 2-methylbutane ; et isobutane et n-pentane.

 
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