Abstract: Solid superacid catalyst SO42?/Kaolin was prepared by twice impregnation-roasting，and the synthesis mechanism of conversion of lactose to levulinic acid was studied. The effects of technological condition，such as catalyst calcination temperature，catalyst dosage，lactose concentration，reaction temperature，reaction time on the relative yield of levulinic acid were investigated and orthogonal experiment was used to determine the optimum conditions. The result showed that the highest relative yield of levulinic acid was 79.13% under the optimal conditions of catalyst calcination temperature 650 ℃，lactose concentration 5 g/L，reaction temperature 200 ℃，reaction time 120 min，catalyst dosage 15% of lactose.

Key words: solid superacid, catalyst levulinic acid, catalytic hydrolysis, lactose

摘要： 利用二次浸渍焙烧法制备固体超强酸催化剂SO42?/高岭土，对其催化水解乳糖制备乙酰丙酸的反应机理作了推理，并通过单变量法考察了催化剂的焙烧温度、乳糖浓度、反应温度、反应时间、催化剂用量等对乙酰丙酸相对收率的影响，采用正交实验来确定最佳工艺条件，研究结果表明：当催化剂的焙烧温度为650 ℃、乳糖浓度5 g/L、反应温度200 ℃、反应时间120 min、催化剂用量为乳糖加入量的15%时，乙酰丙酸的相对收率最大，达到79.13%。

关键词: 固体超强酸催化剂, 乙酰丙酸, 催化水解, 乳糖