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US 5,026,498 AGranted
Binary azeotropic compositions of 1,1,1,2,3,3-hexafluoro-3-methoxypropane with one of trans-1,2-dichloroethylene, cis-1,2-dichloroethylene, 1,1-dichloro-1,2-difluoroethane or 1,2-dichloro-1,1,-difluoroethane
AssigneeE. I. Du Pont de Nemours and Company
InventorAbid N. Merchant
Life of this patent
Estimating the term…
Abstract
Azeotropic mixtures of 1,1,1,2,3,3-hexafluoro-3-methoxypropane with one of trans-1,2-dichloroethylene (t-HCC-1130), cis-1,2-dichloroethylene (c-HCC-1130), 1,1-dichloro-1,2-difluoroethane (HCFC-132c), or 1,2-dichloro-1,2-difluoroethane (HCFC-132), and the use of such azeotropic mixtures in solvent cleaning applications is disclosed.
Claims12
An azeotropic composition consisting essentially of
- (a) about 45-55 weight percent 1,1,1,2,3,3-hexafluoro-3-methoxypropane and about 45-55 weight percent trans-1,2-dichloroethylene, wherein the composition has a boiling point of about 44.3.degree. C. when the pressure is adjusted to substantially atmospheric pressure;
- (b) about 64-74 weight percent 1,1,1,2,3,3-hexafluoro-3-methoxypropane and about 26-36 weight percent cis-1,2-dichloroethylene, wherein the composition has a boiling point of about 50.2.degree. C. when the pressure is adjusted to substantially atmospheric pressure;
- (c) about 5-15 weight percent 1,1,1,2,3,3-hexafluoro-3-methoxypropane and bout 85-95 weight percent 1,1-dichloro-1,2-difluoroethane, wherein the composition has a boiling point of about 48.8.degree. C. when the pressure is adjusted to substantially atmospheric pressure;
- or
- (d) about 82-92 weight percent 1,1,1,2,3,3-hexafluoro-3-methoxypropane and bout 8-18 weight percent 1,2-dichloro-1,2-difluoroethane, wherein the composition has a boiling point of about 52.5.degree. C. when the pressure is adjusted to substantially atmospheric pressure.
2 more elements
Dependencies are inferred from the claim text.