Near-azeotropic ternary compositions constituted by hydrogenated fluorocarbons and hydrocarbons, suitable as refrigerating fluids
US6695973B1 · kind B1 · utility
24Cited by
5References
2Claims
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Key dates
| Filing date | Dec 17, 1996 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Dec 17, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2205/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Near-azeotropic ternary compositions of hydrofluorocarbons with n-butane or isobutane selected from:A)1,1,1,2-tetrafluoroethane (R134a)65-94%by weightpentafluoroethane (R125)2-25%by weightn-butane (R600) and/or isobutane (R-600a)1-10%by weightB)1,1,1,2-tetrafluoroethane (R134a)65-94%by weight1,1,1,2,3,3,3-heptafluoropropane (R227ea)5-25%by weightn-butane (R600) and/or isobutane (R-600a)1-10%by weightSaid compositions have zero ODP, very low GWP and good solvent power for mineral lubricants. They are utilizable as drop-in substituents of R-12 in domestic refrigeration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.