Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane, dichlorotrifluoroethane and ethanol
AssigneeAllied-Signal Inc.
InventorsEllen L. Swan, Rajat S. Basu
Life of this patent
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Abstract
Azeotrope-like compositions comprising 1,1-dichoro-1-fluoroethane, dichlorotrifluoroethane and ethanol are stable and have utility as degreasing agents and as solvents in a variety of industrial cleaning applications including cold cleaning and defluxing of printed circuit boards.
Claims18
Azeotrope-like compositions consisting essentially of from about 62.5 to about 94.9 weight percent 1,1-dichloro-1-fluoroethane, from about 3.0 to about 35.5 weight percent dichlorotrifluoroethane selected from the group consisting of 1,2-dichloro-1,2,2-trifluoroethane, 1,1-dichloro-2,2,2,-trifluoroethane or mixtures thereof and from about 0.1 to about 3.0 weight percent ethanol wherein the composition with 1,2,-dichloro-1,2,2-trifluoroethane boils at about 32.0.degree. C..+-.0.5.degree. C. at 760 mm Hg, the composition with 1,1-dichloro-2,2,2-trifluoroethane boils at about 31.6.degree. C..+-.0.5.degree. C. at 760 mm Hg and the composition with mixtures of the dichlorotrifluoroethanes boils at about 31.8.degree. C..+-.0.5.degree. C. at 760 mm Hg.
Azeotrope-like compositions consisting essentially of 1,1-dichloro-1-fluoroethane, dichlorotrifluoroethane selected from the group consisting of 1,2-dichloro-1,2,2-trifluoroethane, 1,1-dichloro-2,2,2,-trifluoroethane or mixtures thereof and ethanol wherein the composition with 1,2-dichloro-1,2,2-trifluoroethane boils at about 32.0.degree. C..+-.0.5.degree. C. at 760 mm Hg, the composition with 1,1-dichloro-2,2,2-trifluoroethane boils at about 31.6.degree. C..+-.0.5.degree. C. at 760 mm Hg and the composition with mixtures of the dichlorotrifluoroethanes boils at about 31.8.degree. C..+-.0.5.degree. C. at 760 mm Hg.
Dependencies are inferred from the claim text.