磷钨酸绿色催化氧化环己酮合成己二酸

Catalytic oxidation of cyclohexanone to adipic acid using phosphotungstic acid as catalyst

以30%H2O2为氧源,NaHSO4.H2O、KHSO4为酸性配体,磷钨酸为催化剂催化氧化环己酮合成了己二酸。考察了催化剂用量、H2O2用量、酸性配体用量、反应时间以及催化剂重复使用性等因素对己二酸收率的影响。结果表明,磷钨酸在反应体系中有良好的催化活性,并且具有操作方便,条件温和等优点。适宜反应条件为n(环己酮)∶n(磷钨酸)=1∶0.002(摩尔比),硫酸氢钠0.1 g,30%H2O245 mL,回流反应6 h,己二酸收率66.7%;以KHSO4为酸性配体时,己二酸的收率可达71.2%。

By using 30% H202 as oxidant,NaHSO4· H2O or KHSO4 as acidic ligand,adipic acid was syn- thesized with cyclohexanone as raw material and phosphotungstic acid as the catalyst. The effects of catalyst dosage, hydrogen peroxide dosage, acidic ligands, reaction time and reusability of the catalyst on yield of adipic acid were all investigated. The results indicated that the catalyst had high catalytic activity. Optimal reaction conditions were as follows ： n（cyclohexanone） ： n （ phosphotungstic acid） = 1 ： 0. 002, 30% H2O2 45 mL,NaHSO4· H2O 0. 1 g,refluxing 6 h, the yield of adipic acid reached 66.7%. When KHSO4 as acidic ligand,the yield could reach 71.2%.