FIELD: chemistry.
SUBSTANCE: first flow of a higher boiling raw material is subjected to distillation in the first distillation column under the first pressure to separate the first flow of C8-aromatic compounds from the first flow of C9- and heavier aromatic compounds; the second flow of a lower boiling raw material is subjected to distillation in the second distillation column under the second pressure to separate the second flow of C8-aromatic compounds from the second flow of C9- and heavier aromatic compounds; and the upper flow from the second distillation column is passed into one or more boilers of the first distillation column and a steam generator. The first flow of the higher boiling raw material is characterised by a higher content of C9- and heavier aromatic compounds than the second flow of the lower boiling raw material, and the second pressure is higher than the first pressure. The invention also relates to a device for the method realisation.
EFFECT: said parallel columns contribute additional possibilities for energy preservation within the complex.
22 cl, 6 dwg, 1 ex
