Method for producing difluoromethane
US9428428B2 · kind B2 · utility
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21Claims
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Key dates
| Filing date | Jul 3, 2013 |
| Grant date | Aug 30, 2016 |
| Priority date | — |
| Expiry date | Jul 3, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for producing difluoromethane, including the catalytic reaction of dichloromethane with hydrogen fluoride in the liquid phase, in the presence of chlorine, and in the presence of an ionic liquid catalyst consisting of the product of the reaction of antimony pentachloride with an organic salt having the general formula X+A, where A is a halide anion or hexafluoroantimonate, and X+ is a quaternary ammonium cation, quarternary phosphonium or ternary sulfonium. Further, equipment suitable for implementing said method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.