Alkylation and transalkylation of alkylbenzenes in cymene production over zeolite catalysts

作者：Odedairo T; Al Khattaf S^*

来源：Chemical Engineering Journal, 2011, 167(1): 240-254.

DOI：10.1016/j.cej.2010.12.043

• Alkylation
• Transalkylation
• USY
• Dual catalyst
• Cymenes
• Kinetic modeling

Gas-phase alkylation of toluene with isopropanol and its transalkylation with cumene were investigated at 200, 250, 275 and 300 degrees C with contact time ranging from 5 to 20s. These reactions were carried out in a fluidized-bed reactor under atmospheric conditions over USY zeolite and a dual-zeolite based catalyst (DZ) comprising mordenite and ZSM-5. In toluene isopropylation. USY and the dual-zeolite based catalyst showed comparable cymene yield, but the maximum cymene yield over DZ catalyst was obtained at a much lower temperature. Cymene selectivity over USY catalyst increased with increasing feed mole ratio (toluene: isopropanol) from 1:1 to 3:1, while the highest toluene conversion was obtained at optimum equimolar ratio of toluene to isopropanol. The dual-zeolite based catalyst was found to possess the highest conversion in cumene-toluene transalkylation as well as a higher cymene selectivity compared with USY catalyst. Significant cymene yields were noticed in the alkylation of cumene with methanol over USY and the dual-zeolite based catalyst. The apparent activation energy of toluene isopropylation (E(2)) was found to be higher than the value for cymene isopropylation (E(3)).

• 出版日期2011-2-15
• 单位中国石油大学（北京）