| 摘要 |
The invention concerns a method for combined production of paraxylene and benzene, including: separating by adsorption in simulated mobile bed (SMB) a first feed, to produce an extract (E) rich in paraxylene and at least one raffinate (R) poor in paraxylene; converting a secondary toluene feed by selective disproportionation to produce benzene and xylenes, a) initially, producing a supplementary amount of paraxylene in a crystallizing unit fed by the xylenes derived from disproportionation, d) finally, when the adsorbent has aged, separating the distillated extract (E) into a first fraction (Ea) and a second complementary fraction (Eb); replacing the initial crystallizing feed with the current Ea, and recycling the xylenes from the disproportionation to the SMB. The invention enables production of paraxylene and benzene to be maintained in spite of the aging of the SMB adsorbent. |
