NIU Cong-Cong, CAO Xue-Pu, CHEN Li-Jun, ZENG Ai-Wu
1.School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2.State key laboratory of Chemical Engineering, Tianjin University
Abstract Fine desulfurization of coking benzene was studied via FriedelCrafts acylation reaction with acetic anhydride as acylating agent. Catalytic activity of several solid acids, such as MCM-41, HZSM-5, Mont-K10, and their supported catalysts was tested. We found that Mont-K10 had the highest catalytic activity, and its catalytic activity decreased with the increase of the ZnCl2 loading. The mechanism of acetylation catalyzed by solid acid was investigated by FT-IR technique. The results revealed that Lewis acid was the active site for this acylation reaction and the loading of ZnCl2 led to the increase in both the amount and the strength of acid sites. Under the optimum conditions, thiophene conversion rate reached 99.4%. After regeneration for three times, the catalytic activity was recovered and the conversion rate was still up to 90%, though the treatment capacity decreased to half.
2012, Vol. 29 
