Azeotropic compositions of perfluoro-1,2-dimethylcyclobutane with methanol and 1,1-dichloro-1-fluoroethane or dichlorotrifluoroethane
AssigneeE. I. Du Pont de Nemours and Company
InventorAbid N. Merchant
Life of this patent
Estimating the term…
Abstract
Azeotropic mixtures of perfluoro-1,2-dimethylcyclobutane, methanol and either 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 51 to 61 weight percent perfluoro-1,2-dimethylcyclobutane, about 1 to 3 weight percent methanol and about 37 to 47 weight percent 1,1-dichloro-1-fluoroethane wherein the composition boils at about 24.2.degree. C. when the pressure is adjusted to substantially atmospheric pressure.
An azeotropic composition consisting essentially of about 29 to 39 weight percent perfluoro-1,2-dimethylcyclobutane, about 0.7 to 1.7 weight percent methanol and about 60 to 70 weight percent dichlorotrifluoroethane wherein said dichlorotrifluoroethane is 1,1-dichloro-2,2,2-trifluoroethane or 1,1-dichloro-2,2,2-trifluoroethane which contains 1,2-dichoro-1,2,2-trifluoroethane in an amount up to 5 percent, and wherein the composition boils at about 26.0.degree. C. when the pressure is adjusted to substantially atmospheric pressure.
Dependencies are inferred from the claim text.