Refrigerant compositions
View Patent ↗Refrigerant composition are disclosed which comprises: (a) pentafluoroethane, 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.
1. A nonflammable refrigerant composition consisting of:
(a) pentafluoroethane in an amount of 83-90% based on the weight of the composition;
(b) 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane or a mixture thereof in an amount of 7.5-15% by weight based on the weight of the composition; and
(c) isobutane in an amount of from 1-4% by weight based on the weight of the composition.
2. The composition according to claim 1 , wherein the isobutane is an amount of 3-4% by weight based on the weight of the composition.
3. A refrigeration apparatus containing, as refrigerant, a composition as claimed in claim 1 .
4. A nonflammable refrigerant composition consisting of:
(a) pentafluoroethane in an amount of 80-90% based on the weight of the composition;
(b) 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, or a mixture thereof in an amount of 7.5-15% by weight based on the weight of the composition;
(c) isobutane in an amount of from 1-4% by weight based on the weight of the composition; and
(d) an additional component comprising either a lubricant, an additive selected from the group consisting of extreme pressure, antiwear improvers, oxidation inhibitors, thermal stability improvers, corrosion inhibitors improvers, viscosity is index improvers, pour point depressants, detergents, anti-foaming agents, and viscosity adjusters; or mixtures of the lubricant and the additive.
5. A refrigeration apparatus containing, as refrigerant, a composition as claimed in claim 4 .
6. The composition according to claim 4 comprising at least one lubricant selected from the group consisting of mineral oils, alkylbenzene lubricants, synthetic lubricants, and fluorinated oils and mixtures thereof.
7. A nonflammable refrigerant composition consisting of:
(a) pentafluoroethane in an amount of 80-90% based on the weight of the composition;
(b) 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, or a mixture thereof in an amount of 7.5-15% by weight based on the weight of the composition;
(c) isobutane in an amount of from 1-4% by weight based on the weight of the composition;
(d) an additional component comprising either a lubricant, an additive selected from the group consisting of extreme pressure, antiwear improvers, oxidation inhibitors, thermal stability improvers, corrosion inhibitors improvers, viscosity is index improvers, pour point depressants, detergents, anti-foaming agents, and viscosity adjusters; or mixtures of the lubricant and the additive; and
(e) a hydrofluorocarbon in an amount not exceeding 5% by weight.
8. The nonflammable refrigerant composition of claim 7 , wherein the hydrofluorocarbon is selected from the group consisting of trifluoromethane, difluoromethane and mixtures thereof.
9. The nonflammable composition according to claim 8 comprising at least one lubricant selected from the group consisting of mineral oils, alkylbenzene lubricants, synthetic lubricants, and fluorinated oils and mixtures thereof.
10. A refrigeration apparatus containing, as refrigerant, a composition as claimed in claim 7 .
11. The composition according to claim 7 comprising at least one lubricant selected from the group consisting of mineral oils, alkylbenzene lubricants, synthetic lubricants, and fluorinated oils and mixtures thereof.
12. A nonflammable refrigerant composition consisting of:
(a) pentafluoroethane in an amount of 80-90% based on the weight of the composition;
(b) 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, or a mixture thereof in an amount of 7.5-15% by weight based on the weight of the composition;
(c) isobutane in an amount of from 1-4% by weight based on the weight of the composition;
(d) a hydrofluorocarbon selected from the group consisting of trifluoromethane, difluoromethane and mixtures thereof in an amount not exceeding 5% by weight.