Process for the manufacture of halocarbons and selected compounds and azeotropes with HF
US6291730A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1998 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Jan 28, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A liquid phase process is disclosed for producing halogenated alkane adducts of the formula: CAR.sup.1 R.sup.2 CBR.sup.3 R.sup.4 (where A, B, R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are as defined in the specification) which involves contacting a corresponding halogenated alkane, AB, with a corresponding olefin, CR.sup.1 R.sub.2.dbd.C.sup.3 R.sup.4 in a dinitrile or cyclic carbonate ester solvent which divides the reaction mixture into two liquid phases and in the presence of a catalyst system containing: (i) at least one catalyst selected from monovalent and divalent copper; and optionally (ii) a promoter selected from aromatic or aliphatic heterocyclic compounds which contain at least one carbon-nitrogen double bond in the heterocyclic ring. When hydrochlorofluorocarbons are formed, the chlorine content may be reduced by reacting the hydrochlorofluorocarbons with HF. New compounds disclosed include CF.sub.3 CF.sub.2 CCl.sub.2 CH.sub.2 CCl.sub.3, CF.sub.3 CCl.sub.2 CH.sub.2 CH.sub.2 Cl and CF.sub.3 CCl.sub.2 CH.sub.2 CHClF. These compounds are useful as intermediates for producing hydrofluorocarbons. Azeotropes of CClF.sub.2 CH.sub.2 CF.sub.3 with HF and azeotropes of CF.sub.3 CH.s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.