阳离子交换树脂催化合成苹果酯- B的研究

采用强酸性阳离子交换树脂为催化剂，以乙酰乙酸乙酯、1，2-丙二醇为原料合成苹果酯-B。分别研究了反应温度、反应时问、原料配比和催化剂用量等条件对合成反应的影响。得到了合成苹果酯-B最适宜的条件：104℃，反应3h，乙酰乙酸乙酯与1，2-丙二醇摩尔比为1：1．45，带水剂环己烷为15mL（乙酰乙酸乙酯为0．15mol的情况下），强酸性阳离子交换树脂的用量为总物料质量的5．25％。苹果酯-B的收率可达到96．8l％，产品中苹果酯-B质量分数为99．8％。

Study of synthesis of fructone- B by cation exchange resin

The strongly acidic cation exchange resin catalyzed synthesis of fructone-B by the reaction of ethyl acetoacetate and 1,2-propanediol was studied.The effect of reaction temperature,reaction time,molar ratio of the reactants and the amount of catalyst on the yield were investigated.The proper technological conditions were given as follows,reaction temperature is 104 ,reaction time is 3 hn(ethyl acetoacetate)n(1,2-propanediol)=11.45,the water stripping reagent(cyclohexane)is 15 mL(when acetoacetate is 0.15 mol),the amount of strongly acidic cation exchange resin is 5.25 %(based on total mass of reactants).The yield of fructone-B can reach 96.81 %.Purity of the fructone-B reaches 99.8 %.