1,1,2,2,3,3,4,4-octafluorobutane azeotropic (like) compositions
AssigneeE. I. Du Pont de Nemours and Company
InventorBarbara Haviland Minor
Life of this patent
Estimating the term…
Abstract
Compositions of 1,1,2,2,3,3,4,4-octafluorobutane and a compound of the formula selected from the group consisting of a 4-6 carbon linear or a cyclic hydrofluorocarbon or fluorocarbon, a 3-5 carbon fluoroether, a fluorinated alcohol, perfluoro-n-methylmorpholine; and an ether are disclosed. These compositions, which may be azeotropic or azeotrope-like, may be used as refrigerants, in small turbine high speed compressors. They may also be used as refrigerants, cleaning agents, expansion agents for polyolefins and polyurethanes, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents, displacement drying agents or as an anesthetic.
Claims7
An azeotropic or azeotrope-like composition consisting essentially of about 1-99 weight percent 1,1,2,2,3,3,4,4-octafluorobutane and about 1-99 weight percent of a fluoroether selected from the group consisting of 1,1,1,2,2,3,3,4,4,-nonafluoro-4-methoxy-butane, 1,1,1,2,3,3,-hexafluoro-2-(trifluoromethyl)-3-methoxy-propane 1,1,1,3,3,3-hexafluoro-2-methoxy-2-(trifluoromethyl)-propane, and 1,1,1,2,3,3,4,4,4-nonafluoro-2-methoxy-butane, wherein when the temperature has been adjusted to about 25.degree. C., said composition has a vapor pressure of about 4.11 to about 6.91 psia and wherein the change in vapor pressure is less than about 10 percent when 50 percent of the composition has been removed.
Dependencies are inferred from the claim text.