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US 5,240,634 AGranted
Ternary azeotropic compositions of 1,1-dichloro-1,2-difluoroethane and cis-1,2-dichloroethylene with methanol or ethanol or n-propanol
AssigneeE. I. Du Pont de Nemours and Company
InventorAbid N. Merchant
Life of this patent
Estimating the term…
Abstract
Azeotropic mixtures of 1,1-dichloro-1,2-difluoroethane (HCFC-132c) and cis-1,2-dichloroethylene (c-HCC-1130) with methanol, or ethanol or n-propanol are useful in solvent cleaning applications, as refrigerants, aerosol propellants and blowing agents.
Claims19
An azeotropic composition consisting essentially of:
- (a) about 85-95 weight percent 1,1-dichloro-1,2-difluoroethane, about 0.7-2.7 weight percent cis-1,2-dichloroethylene and about 5-11 weight percent methanol, wherein the composition boils at about 45.5.degree. C. when the pressure is adjusted to substantially atmospheric pressure;
- (b) about 90-99 weight percent 1,1-dichloro-1,2-difluoroethane, about 0.1-1.3 weight percent cis-1,2-dichloroethylene and about 2-6 weight percent ethanol, wherein the composition boils at about 48.3.degree. C. when the pressure is adjusted to substantially atmospheric pressure;
- or
- (c) about 90.0-99.7 weight percent 1,1-dichloro-1,2-difluoroethane, about 0.3-1.3 weight percent cis-1,2-dichloroethylene and about 0.001-0.1 weight percent n-propanol, wherein the composition boils at about 48.7.degree. C. when the pressure is adjusted to substantially atmospheric pressure.
1 more element
The process of claim 11, wherein the solid surface is a printed circuit board contaminated with flux and flux-residues.
The process of claim 12, wherein the solid surface is a metal.
Dependencies are inferred from the claim text.