Halocarbon blends for refrigerant use
AssigneeE. I. Du Pont de Nemours and Company
InventorsDonald B. Bivens, Helen A. Connon
Life of this patent
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Abstract
A unique refrigerant containing three or more halocarbons, each halocarbon after the first having a successively higher boiling point. The refrigerant has a temperature/pressure relation substantially equal to FC-12. Also provided is a method for producing cooling and a method for producing heating using this refrigerant.
Claims9
A refrigerant comprising about 10 to 60 weight percent of a first halocarbon having a boiling point at atmospheric pressure in the range of about -50.degree. C. to about -30.degree. C., about 10 to 60 weight percent of a second halocarbon having a boiling point at atmospheric pressure in the range of about -30.degree. C. to about -5.degree. C., and about 10 to 75 weight percent of a third halocarbon having a boiling point at atmospheric pressure in the range of about -15.degree. C. to about 30.degree. C.;
- said second halocarbon being higher boiling than said first halocarbon and said third halocarbon being higher boiling than said second halocarbon;
- said halocarbons containing at least one fluorine atom;
- at least one of said halocarbons containing a hydrogen atom;
- said first and third halocarbons being nonflammable;
- said first, second and third halocarbons and their proportions being chosen such that the resulting refrigerant is nonflammable and has a vapor pressure substantially equal to the vapor pressure of dichlorodifluoromethane over the temperature range of about 0.degree. C. to about 100.degree. C.;
- said refrigerant having substantially lower ozone depletion potential than the ozone depletion potential of dichlorodifluoromethane, said refrigerant excluding dichlorodifluoromethane.
Dependencies are inferred from the claim text.