以邻苯二酚和乙醛酸为主要原料,经缩合、空气催化氧化、脱羧反应制备3,4-二羟基苯甲醛。重点考察了氧化脱羧反应阶段,并获得了最佳的实验条件:反应温度90℃,n(催化剂)∶n(3,4-二羟基扁桃酸)=0.04∶1.00,反应时间7 h和空气流速1.5 mL/min。在较佳的反应条件下,3,4-二羟基苯甲醛的收率≥75.8%,质量分数≥96.1%。 With catechol and glyoxylic acid as the main raw material, condensation, air catalytic oxidation, decarboxylation reaction 3,4-dihydroxybenzaldehyde. The oxidative decarboxylation reaction stage was investigated emphatically and the optimum experimental conditions were obtained: reaction temperature 90 ℃, n (catalyst): n (3,4-dihydroxymandelic acid) = 0.04:1.00, reaction time 7 h and air velocity 1.5 mL / min. Under the optimum reaction conditions, the yield of 3,4-dihydroxybenzaldehyde is more than 75.8% and the mass fraction is more than or equal to 96.1%.