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苯甲醛是一种重要的化学中间体和美国食品药物管理局认证的添加剂.现代化工生产苯甲醛的工艺存在很多的不足,本文通过向溶剂中添加乙酸酐的方法提高了苯甲醛的选择性和产率,讨论了乙酸酐在甲苯氧化过程中的作用,并获得其优化工艺条件.在该条件下苯甲醛选择性最高达68.69%,产率最高为26.12%,且反应温度(98℃),反应压力(1atm O2)都较之前报道的文献温和很多,该反应条件有腐蚀性低、能耗低、副产物少等优点.此外,本文还研发出一种简便有效的催化剂回收方法.
Benzaldehyde is an important chemical intermediate and certified by the Food and Drug Administration as an additive.Modern chemical production of benzaldehyde process there are many deficiencies in this paper by adding acetic anhydride to the solvent to improve the selectivity of benzaldehyde and Acetic anhydride in the oxidation of toluene was discussed and the optimum conditions were obtained.Under this condition, the selectivity to benzaldehyde was up to 68.69%, the highest yield was 26.12%, and the reaction temperature (98 ℃) The reaction pressure (1 atm O2) is much milder than previously reported, and the reaction conditions are low corrosivity, low energy consumption, less by-products, etc. In addition, this paper also developed a simple and effective catalyst recovery method.