Autorefrigerated isomerization process
US4048251A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1976 |
| Grant date | Sep 13, 1977 |
| Priority date | — |
| Expiry date | Jan 2, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C5/2721
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Acyclic and alicyclic aliphatic hydrocarbons are isomerized to form a product of enhanced octane by contacting same, in a reaction zone and in the presence of hydrogen, with a catalyst comprising a difficultly reducible metal halide in combination with at least a molar equivalent of hydrogen halide, said reaction zone comprising at least one temperature zone, the temperature in at least one zone being controlled by using said hydrogen halide as an autorefrigerant. In a preferred embodiment, at least a portion of the autorefrigerant evolved from the reaction zone is condensed and used to extract at least a portion of the metal halide component of the catalyst from at least a portion of the hydrocarbon product. A preferred catalyst is tantalum pentafluoride, niobium pentafluoride or their mixtures in combination with at least a five-fold molar excess of hydrogen fluoride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.