磷钨酸-有机酸性助剂催化氧化环己酮合成己二酸

Catalytic Oxidation of Cyclohexanone to Adipic Acid by Phosphotungstic Acid and Acidic Organic Additive

以磷钨酸-有机酸性助剂为催化体系,催化30%H2O2氧化环己酮合成己二酸。环己酮100 mol,n(磷钨酸)∶n(有机酸性助剂)∶n(环己酮)∶n(H2O2)=1∶10∶400∶2 000时,使用有机酸性助剂调节磷钨酸催化活性,结果表明以磷钨酸-酒石酸钾钠氧化环己酮效果最优,反应8 h时己二酸分离产率达93.1%;单独以磷钨酸为催化剂时,产率62.5%。以4-氨基安替比林或酒石酸钾钠为有机酸性助剂时,随反应时间的延长,产率一般会升高。磷钨酸-酒石酸钾钠和磷钨酸-4-氨基安替比林催化体系重复使用5次后,产率仍分别达到87.1%和80.6%。

The catalytic oxidation of cyclohexanone to adipic acid with 30% hydrogen peroxide can be achieved in the presence of phosphotungstic acid and acidic organic additive. Under the reacion conditions that cyclohexanone was 100 mmol, n（phosphotungstic acid） ：n（acidic organic additive） ：n （cyclohexanone） ： n（H2O2） was 1：10：400：2 000, the isolated yield of adipic acid was up to 93.1% for 8 h using phosphotungstic acid and tartaric acid（ sodium potassium） as the catalyst system and the yield was 62.5 % with low purity when using only phosphotungstic acid. Using tartaric acid （sodium potassium） and 4-amino-antipyrine as additives, the yield increased with reaction time increasing. Catalyst system of phosphotungstic acid and tartaric acid （sodium potassium） or phosphotungstic acid and 4-amino-antipyrine can be reused five times and the yield was still 93. 1% and 80.6% , respectively.