新型碳基固体酸催化合成缩醛(酮)

以羟乙基磺酸和呋喃甲醛为原料,采用水热碳化缩合法合成了一种新型碳基固体酸催化剂,并将其用于催化丁酮与乙二醇缩合合成缩酮;考察了原料配比、反应时间、催化剂用量等因素对合成反应的影响,得到了优化反应条件;同时研究了该催化剂催化其他醛(酮)化合物与二醇反应的活性。实验结果表明,该碳基固体酸具有很高的催化活性,催化丁酮与乙二醇缩合反应的最佳条件为:n(乙二醇)∶n(丁酮)=1.2、催化剂用量为反应物质量的0.7%,反应1.5h。在此条件下,丁酮转化率达93.5%,产物缩酮的选择性达99.1%。该碳基固体酸还可催化各种醛(酮)与二醇进行缩合反应,在最佳反应条件下,醛(酮)的转化率高达90%以上,缩醛(酮)的选择性高达97%以上。该反应具有催化剂用量少及重复使用活性高、后处理简单、反应时间短和无污染等优点。

Synthesis of Acetais(Ketals) over Carbon Based Solid Acid Catalysts

A carbon based solid acid was synthesized through hydrothermal carbonization of furaldehyde and hydroxyethyl sulfonic acid.Its catalytic activity in condensation of butanone and glycol was investigated.The effects of n(glycol) ∶n(butanone),reaction time and catalyst dosage on the synthesis were studied.Under the optimal reaction conditions: mole ratio of glycol to butanone 1.2,catalyst mass fraction(based on the total reactant mass) 0.7% and reaction time 1.5 h,the butanone conversion and the product ketal selectivity were 93.5% and 99.1%,respectively.The catalyst was also very efficient for condensations of various aldehydes(ketones) and diols,and the conversions of aldehydes(ketones) and the selectivities to acetals(ketals) reached more than 90% and more than 97%.Moreover,the catalyst is environmental-friendly.