Azeotropic compositions of perfluoro-1,2-dimethylcyclobutane with 1,1-dichloro-1-fluoroethane or dichlorotrifluoroethane
AssigneeE. I. Du Pont de Nemours and Company
InventorAbid N. Merchant
Life of this patent
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Abstract
Azeotropic mixtures of perfluoro-dimethylcyclobutane with 1,1-dichloro-1-fluoroethane or dichlorotrifluoroethane, are useful in solvent cleaning applications, and as refrigerants, aerosol propellants and polymer blowing agents.
Claims16
An azeotropic composition, consisting essentially of about 50 to 60 weight percent perfluoro-1,2-dimethylcyclobutane and about 40-50 weight percent 1,1-dichloro-1-fluoroethane wherein the composition boils at about 26.7.degree. C. when the pressure is adjusted to substantially atmospheric pressure.
An azeotropic composition, consisting essentially of about 23 to 33 weight percent perfluoro-1,2-dimethylcyclobutane and from about 67 to 77 weight percent dichlorotrifluoroethane wherein said dichlorotrifluoroethane is 1,1-dichloro-2,2,2,-trifluoroethane or 1,1-dichloro-2,2,2-trifluomethane which contains 1,2-dichloro-1,2,2-trifluoroethane in an amount up to 5 percent, and wherein the composition boils at about 27.0.degree. C. when the pressure is adjusted to substantially atmospheric pressure.
Dependencies are inferred from the claim text.