Thermal coupled process for separation of xylene tower in disproportionation unit and aromatic hydrocarbon unit
In response to the drawbacks of repeated condensing and heating of C8 and C9 feedstocks in the disproportionation unit and aromatics units,as well as the large number of equipment,high investment,large land occupation,and complex start-up proce-dures,a low cost separation thermal coupled distilla-tion technology that met the deep separation of C8 aro-matics and alkyl transfer of C9 aromatics was devel-oped by Ningbo Daxie Petrochemical Co Ltd of CNOOC.The characteristics of the distillation tech-nology was that merged the heavy aromatics tower of the disproportionation unit and the xylene tower of the aromatics unit into a new xylene tower.The results showed that through the simulation of Petro-SIM soft-ware,the mass fraction of toluene in the C8 aromatic hydrocarbon product obtained by the thermal coupled process of the xylene tower separation was less than 0.98%,the mass fraction of C≥9 heavy aromatic hy-drocarbons was less than 2.51%,and the mass frac-tion of C8 aromatic hydrocarbons in the C9 aromatic hydrocarbon product obtained was less than 0.21%,and the mass fraction of C≥10 heavy aromatic hydro-carbons was less than 0.07%.Compared with tradi-tional processes,the construction investment of the thermal coupled process unit was reduced by about 27 million Yuan,saving 6 666.7 m2 of land and re-ducing carbon dioxide emissions by 9600 t/a.
万方数据
维普
