Separating 1,1,1,3,3-pentafluoropropane from hydrogen fluoride
US6303838A · kind A · utility
3Cited by
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8Claims
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Key dates
| Filing date | Mar 31, 2000 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Mar 31, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C19/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed are processes for separating 1,1,1,3,3-pentafluoropropane (HFC-245fa) from hydrogen fluoride (HF) by distillation, wherein hydrocarbons, chloroflurocarbons, hydrochlorofluorocarbons and fluorocarbons are used as entraining agents. The processes comprise: contacting a first mixture comprising HFC-245fa and HF with an entraining agent selected from the group consisting of hydrocarbons, chlorofluorocarbons, hydrochlorofluorocarbons and fluorocarbons to form a second mixture, distilling the second mixture and thereby separating the HFC-245fa from HF and entraining agent, and recovering HFC-245fa substantially-free of HF.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.