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摘要: 以Hβ分子筛为催化剂，对甲苯与乙酸酐(AA)的酰化反应进行了研究。通过研究反应温度、压力、甲苯与乙酸酐(AA)摩尔比、催化剂用量、以及溶剂的种类和用量等因素对反应转化率和选择性的影响，确定了较优的反应条件。结果表明，Hβ分子筛对甲苯与乙酸酐(AA)酰化反应具有较好的催化活性和选择性，适宜的反应条件为：温度130 ℃、甲苯/乙酸酐(AA)摩尔比20、催化剂/乙酸酐(AA)重量比0.8，极性溶剂如硝基苯等对酰化反应有一定的促进作用，但选择性有所下将，而非极性溶剂如二氧化碳可部分抑制催化剂的失活。Abstract: 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.
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Key words:
- acylation /
- toluene /
- acetic anhydride /
- methylacetophenone /
- β zeolite /
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