Abstract: The operation of transalkylation and disproportionation catalyst under high space velocity and low hydrogen to hydrocarbon (H2/HC) ratio at the aromatics complex unit of CNOOC Huizhou Refinery was introduced, as well as the regeneration of this catalyst. Processing feedstock with relative high C10+ aromatics content and after running about 2 years under high space velocity and low H2/HC ratio conditions, the coke deposited on the catalyst was as high as over 39%, thus the activity of the catalyst dropped significantly. The deactivated catalyst was stripped by hydrogen, and then followed by burning coke under low oxygen atmosphere and removing coke under high oxygen atmosphere, about 35.80 t of coke was eliminated. The catalytic performance of the regenerated catalyst was good, which indicated that said catalyst possessed good regeneration property.

Key words: aromatics, toluene disproportionation, catalyst, regeneration