| 摘要 |
<p>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containing C6 to C10+ alkylbenzene is passed into a fractionation zone wherein an admixture of benzene and toluene is withdrawn as a lower boiling fraction, and C8+ alkylbenzenes are withdrawn in admixture as a higher boiling fraction.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 fractionating benzene and toluene.</p> |
