PARAXYLENE SEPARATION PROCESS COMPRISING AT LEAST TWO HIGH TEMPERATURE CRYS TALLIZATION STAGES comprising two or more high temperature crystallization steps.

摘要

The present invention relates to a process for the preparation of C₇To C₉Circulating at least a portion of the feedstock containing the aromatic hydrocarbon mixture; And;Purifying para-xylylene from said feedstock, comprising treating at least a portion of said first fraction in at least one crystallization zone of said one purification zone through one or more high temperature crystallization processes to thereby purify said purification zone Characterized in that the first fraction of para-xylene-rich content is added to a refinery zone comprising a crystallization step (50,70) of at least one high temperature, preferably 10C to-25C, And crystallizing the crystals. The enriched region of para-xylene can be cryogenic crystallization, selective adsorption or toluene disproportionation regions.