Fractionation of aromatic streams
US3996305A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 27, 1975 |
| Grant date | Dec 7, 1976 |
| Priority date | — |
| Expiry date | Mar 27, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C6/126
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A novel fractionation scheme applicable to a transalkylation process in which an admixture of toluene and C.sub.9 alkylbenzene is converted to principally benzene and C.sub.8 alkylbenzene is disclosed. Transalkylation zone effluent containing C.sub.6 -C.sub.10 alkylbenzene or a C.sub.6 -C.sub.10 alkylbenzene admixture of transalkylation zone effluent and extract from an aromatics separation zone is passed into a fractionation zone wherein an admixture of benzene and toluene is withdrawn as a lower boiling fraction, C.sub.8 alkylbenzene is withdrawn as a central boiling fraction, and C.sub.9 and C.sub.10 alkylbenzne are withdrawn in admixture as a higher boiling fraction. The lower and higher boiling fractions are introduced into a fractionator at a higher and a lower locus, respectively. From the fractionator, an overhead fraction containing benzene and a bottoms fraction containing C.sub.10 alkylbenzene are withdrawn as product streams, and one or more sidecut fractions including toluene and C.sub.9 alkylbenzene are withdrawn and recycled to the transalkylation zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.