Fractionation of aromatic streams

Details Fractionation of aromatic streams Fractionation of aromatic streams

C - Chemistry, Metallurgy

07

C

260/686

C07C 15/08 (2006.01) C07C 6/12 (2006.01) C07C 7/04 (2006.01) C07C 7/08 (2006.01) C07C 15/04 (2006.01)

Patent

CA 1080755

ABSTRACT OF THE DISCLOSURE A fractionation scheme applicable to a transalkylation process in which an admixture of toluene and C9 alkylbenzene is converted to benzene and C8 alkylbenzene is disclosed. Transalkylation zone effluent containing C6 to C10+ alkylben- zene is passed into a fractionation zone wherein an admixture of benzene and toluene is withdrawn as a lower boiling frac- tion, and C8+ alkylbenzenes are withdrawn in admixture as a higher boiling fraction. The benzene and toluene fractions are introduced into a fractionator and separated therein. The C9+ fraction is fractionated into a C9/C10 overhead fraction and C10+ bottoms fraction. Toluene and C9/C10 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 C9/C10 vapor fraction to reboil the column fraction- ating benzene and toluene.

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