High severity process for xylene production employing a transalkylation zone for xylene isomerization
US4642406A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 13, 1985 |
| Grant date | Feb 10, 1987 |
| Priority date | — |
| Expiry date | Sep 13, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C7/11
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is disclosed for the production of high quality benzene and a desired xylene isomer, preferably paraxylene, from a mixture of C.sub.7 -plus alkylaromatic hydrocarbons. The desired xylene isomer is recovered by absorptive separation from a stream of two or three xylene isomers. The resultant isomer-depleted stream is passed into a transalkylation zone together with both feed and recycled toluene and C.sub.9 aromatic hydrocarbons instead of being passed into a xylene isomerization zone. Benzene and xylenes are fractionated from the transalkylation zone effluent stream, with the xylenes being passed into the absorptive separation zone. A nonmetal catalyst is employed in the transalkylation zone, which must be operated at high severity (high temperature) conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.