Azeotrope-like composition of 1,1,1,3,3-pentafluoropropane and 1-chloro-1,1,3,3,3-pentafluoropropane
US6524496B2 · kind B2 · utility
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8Claims
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Key dates
| Filing date | Mar 21, 2001 |
| Grant date | Feb 25, 2003 |
| Priority date | — |
| Expiry date | Mar 21, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/30
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Provided are azeotropic and azeotrope-like mixtures of 1,1,1,3,3-pentafluoropropane (HFC-245fa) and 1-chloro-1,1,3,3,3-pentafluoropropane (HCFC-235fa) that are useful as intermediates in the production of HFC-245fa. A process for separating HFC-245fa and HCFC-235fa is also provided. HFC-245fa is useful as a nontoxic, zero ozone depleting fluorocarbon useful as solvents, blowing agents, refrigerants, cleaning agents, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing compositions and power cycle working fluids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.