Fractionation of aromatic streams

Details Fractionation of aromatic streams Fractionation of aromatic streams

1975-03-27

1976-12-07

Davis, C.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260674R, 260674SE, C07C 362

Patent

active

039963055

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from an aromatics separation zone is passed into a fractionation zone wherein an admixture of benzene and toluene is withdrawn as a lower boiling fraction, C.sub.8 alkylbenzene is withdrawn as a central boiling fraction, and C.sub.9 and C.sub.10 alkylbenzne are withdrawn in admixture as a higher boiling fraction.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the fractionator, an overhead fraction containing benzene and a bottoms fraction containing C.sub.10 alkylbenzene are withdrawn as product streams, and one or more sidecut fractions including toluene and C.sub.9 alkylbenzene are withdrawn and recycled to the transalkylation zone.

REFERENCES:
patent: 3527825 (1970-09-01), Pollitzer
patent: 3551510 (1970-12-01), Pollitzer et al.
patent: 3701813 (1972-10-01), Stenmark
patent: 3729521 (1973-04-01), Gatberlet et al.

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