Process for the preparation of difluoromethane
US5817894A · kind A · utility
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10Claims
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Key dates
| Filing date | Sep 3, 1997 |
| Grant date | Oct 6, 1998 |
| Priority date | — |
| Expiry date | Sep 3, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/206
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Difluoromethane is produced from dichloromethane and hydrogen fluoride by continuous reaction in a liquid medium comprising an inorganic fraction and an organic fraction, in which a content by weight of the said organic fraction in the liquid medium is maintained at less than or equal to 25% of the sum of the inorganic and organic fractions and a content by weight of dichloromethane in the liquid medium is maintained at less than or equal to 10% of the sum of the inorganic and organic fractions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.