NaX/NaF催化剂的制备及其应用于催化合成脱氢乙酸

Preparation of NaX/NaF Solid Alkaline Catalyst and Synthesis of Dehydroacetic Acid Catalyzed by Solid Base

摘要: 以NaX分子筛为载体，负载前驱体NaF，采用浸渍法制备环境友好负载型固体碱NaF/NaX催化剂，并用于催化乙酰乙酸乙酯合成脱氢乙酸。探讨了NaF负载量、煅烧温度、煅烧时间对催化剂活性的影响；考查了催化剂用量、反应温度和反应时间对脱氢乙酸收率的影响。实验结果表明，固体碱催化剂NaF/NaX的最佳制备条件为NaF负载量20%，600℃下煅烧7 h；最适的脱氢乙酸合成条件为催化剂用量0.02%(以乙酰乙酸乙酯质量计)，反应温度210℃，反应时间7 h，该条件下脱氢乙酸产率达81%。

Abstract: The solid base catalyst NaF/NaX was prepared by impregnation. Dehydroacetic acid was synthesized from ethylacetoacetate in those friendly environmental solid base. Effects of the calcination temperature, calcination time, loading amount, mass fraction of catalyst, reaction temperature and time on the reaction were studied. The results showed that, the optimal catalyst were prepared under the conditions of loading amount 20%, calcination temperature 600°C and calcination time 7 h. Under the conditions of the mass fraction of catalyst 0.02%, reaction temperature 210°C and reaction time 7 h, the yield of dehydroacetic acid reached 81%.