Hβ分子筛催化的甲苯与乙酸酐(AA)酰化反应研究

Acylation of toluene to methylacetophenone with acetic anhydride（AA） over Hβzeolite was investigated. The effects of various factors such as reaction temperature, selection of solvent, amounts of catalysts and solvents, and the ratio of toluene to acetic anhydride (AA) on the yield and selectivity of para-methylacetophenone were examined. The suitable reaction conditions were optimized as 130 ℃, a toluene/acetic-anhydride (AA) mole ratio of 20, catalyst/ acetic-anhydride (AA) ratio (weight) of 0.8. Polar solvent (e.g., nitrobenzene ) enhances the acylation of toluene with acetic anhydride (AA), but the selectivity of para-methylacetophenone is reduced. Correspondingly, non-polar solvent (e.g., CO2) help restrain the deactivation of the catalyst.