FIELD: chemistry.
SUBSTANCE: invention relates to method of separating p-xylene from raw material flow, which contains C8-aromatic hydrocarbons and, at least, one C9-aromatic hydrocarbon component. Method includes: (a) introduction of first adsorbent, containing Y-zeolite or X-zeolite, in contact with raw material flow and first flow of desorbent, containing first desorbent with boiling temperature not lower than 150°C, in first zone of adsorptive separation in order to obtain first flow of extract, which contains p-xylene and first desorbent, and first flow of raffinate, which contains depleted of p-xylene C8-aromatic hydrocarbons, C9-aromatic hydrocarbon component and first desorbent; (b) supply of first flow of extract into zone of extract distillation for obtaining second flow of desorbent, containing first desorbent, and p-xylene flow; (c) supply of first flow of raffinate into zone of raffinate distillation for obtaining third flow of desorbent, containing first desorbent and C9-aromatic hydrocarbon component, and flow of raffinate, containing depleted of p-xylene C8-aromatic hydrocarbons; and (d) supply of, at least, part of third flow of desorbent and flow of desorbent, which contains second desorbent, into second zone of adsorptive separation, containing second adsorbent, for obtaining second flow of extract, containing first desorbent and second desorbent, and second flow of raffinate, containing C9-aromatic hydrocarbon component and second desorbent. Invention also relates to device for claimed method realisation.
EFFECT: invention makes it possible to separate C9-aromatic hydrocarbons in efficient way.
10 cl, 4 dwg
