Process for purifying difluoromethane
US6297412A · kind A · utility
1Cited by
1References
11Claims
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Key dates
| Filing date | Feb 21, 2001 |
| Grant date | Oct 2, 2001 |
| Priority date | — |
| Expiry date | Feb 21, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for purifying difluoromethane, which comprises subjecting a mixture comprising difluoromethane and hydrogen fluoride to extraction treatment with at least one extractant selected from the following (a) and (b) to separate it by liquid separation into an extractant layer comprising the difluoromethane and the extractant as the main components, and a hydrogen fluoride layer comprising the hydrogen fluoride as the main component, and separating the difluoromethane from the extractant layer: PA1 (a) Dichloromethane PA1 (b) Chlorofluoromethane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.