[Objective] The aim was to explore oxidation conditions of p-methyl benzaldehyde to p-methylbenzoic acid by H2O2. [Method] Using hydrogen peroxide as an oxidant catalyze, p-methyl benzaldehyde was oxidized into p-methylbenzoic acid under the alkaline condition, and the operation conditions were optimized by orthogonal test. The product was determined by melting point and infrared spectrometry. [ Result ] The optimal operation conditions were as followed: the molar ratio of p-methyl benzaldehyde and 30% H2 O2 was 1:6; the reaction temperature was 40 ℃ ; and the concentration of KOH was 60%. Under the best reaction conditions, the yield of p-methylbenzoic acid reached more than 91% , and the reproducibility experiment result showed that the average yield of p-methylbenzoic acid reached 91.7%. [Conclusion ] The research lays a foundation for the industrial production of p-methylbenzoic acid.%[目的]探讨过氧化氢氧化对甲基苯甲醛制备对甲基苯甲酸的工艺条件.[方法]以30％过氧化氢为氧化剂,在碱性条件下氧化对甲基苯甲醛制备对甲基苯甲酸,采用正交试验探讨了对甲基苯甲酸的最佳合成工艺条件,并通过测定熔点、红外光谱表征了目标化合物.[结果]优化的合成条件为:物料摩尔比对甲基苯甲醛:30％过氧化氢=1:6,反应温度为40℃；氢氧化钾浓度为60％.该工艺条件下,对甲基苯甲酸产率达到91％以上；重复性试验结果显示,对甲基苯甲酸的平均收率达91.7％.[结论]为对甲基苯甲酸的工业化生产奠定了基础.
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