An Integrated Process for Toluene Selective and Traditional Disproportionation

In view of the fact that selective disproportionation process,though high in p-xylene concentration in the product,is not able to convert C 9A,a new process is proposed combining toluene selective disproportionation process with traditional toluene disproportionation process in the aromatic complex unit.Influence on productivity and production scale of varying toluene distribution between two units was studied using the simulation software PRO/Ⅱ.Research results showed that with increasing toluene drawing ratio to selective disproportionation unit,p-xylene productivity decreased and benzene productivity increased and production scale of each unit also decreased.This combined process was a good approach for revamping aromatic combined unit.