Fractionation of aromatic streams

Details Fractionation of aromatic streams Fractionation of aromatic streams

1976-02-19

1977-08-09

Gantz, Delbert E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

203 25, 208 95, C07C 362

Patent

active

040410919

ABSTRACT:
A fractionation scheme applicable to a transalkylation process in which an admixture of toluene and C.sub.9 alkylbenzene is converted to benzene and C.sub.8 alkylbenzene is disclosed. Transalkylation zone effluent containing C.sub.6 to C.sub.10 + alkylbenzene is passed into a fractionation zone wherein an admixture of benzene and toluene is withdrawn as a lower boiling fraction, and C.sub.8 + alkylbenzenes are withdrawn in admixture as a higher boiling fraction. The benzene and toluene fraction is introduced into a fractionator and separated therein. The C.sub.8 + fraction is fractionated into xylenes and C.sub.9 +. The C.sub.9 + fraction is fractionated into a C.sub.9 /C.sub.10 overhead fraction and C.sub.10 + bottoms fraction. Toluene and C.sub.9 /C.sub.10 are then fed to the transalkylation zone. Significant savings in utilities are realized by using a xylene vapor fraction to reboil the column fractionating transalkylation zone effluent, and by using the C.sub.9 /C.sub.10 vapor fraction to reboil the column fractionating benzene and toluene.

REFERENCES:
patent: 3304340 (1967-02-01), Noll
patent: 3701813 (1972-10-01), Stenmark
patent: 3784621 (1974-01-01), Suggitt

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