Process for preparing R-1234yf by base mediated dehydrohalogenation
US8822740B2 · kind B2 · utility
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15Claims
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Key dates
| Filing date | Jun 13, 2013 |
| Grant date | Sep 2, 2014 |
| Priority date | — |
| Expiry date | Jun 13, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C45/63
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a process for preparing 2,3,3,3-tetrafluoropropene (CF3CF═CH2), performed using the steps of dehydrohalogenating 1,1,1,2,2-pentafluoropropane (CH3CF2CF3, HFC-245ca) 1,1,1,2-tetrafluoro-2-chloropropane, 1,1,1,2,3-pentafluoropropane (CH2FCHFCF3, HFC-245eb) and/or 1,1,1,2-tetrafluoro-3-chloropropane in the presence of a base, and converting a trifluorodichloropropane or a difluorotrichloropropane or a fluorotetrachloropropane to CH3CF2CF3, 1,1,1,2-tetrafluoro-2-chloropropane, CH2FCHFCF3, and/or 1,1,1,2-tetrafluoro-3-chloropropane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.