Method for preparing olefin fluorine compounds
US8809601B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2010 |
| Grant date | Aug 19, 2014 |
| Priority date | — |
| Expiry date | May 19, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/80
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a method for preparing olefin fluorine compounds. Specifically, the invention relates to a method for producing a (hydro)fluoroolefin compound, including: (i) in an agitated reactor provided with at least one reactant inlet and at least one outlet, contacting, with potassium hydroxide in an aqueous reaction medium, at least one compound containing three to six carbon atoms, at least two fluorine atoms, and at least one hydrogen atom, with the proviso that at least one hydrogen atom and one fluorine atom are located on adjacent carbon atoms, so as produce the (hydro)fluoroolefin compound, separated in a gaseous state from the reaction medium and from potassium fluoride; (ii) in an aqueous medium, contacting the potassium fluoride formed in step (i) with calcium hydroxide in a second reactor so as to produce potassium hydroxide and to precipitate calcium fluoride; (iii) separating the calcium fluoride precipitated in step (ii) from the reaction medium; and (iv) optionally recirculating the reaction medium after optionally recirculating the reaction medium after optionally adjusting the concentration of potassium hydroxide in step (i), characterized in that po…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.