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介绍了一种合成固体氰乙酸的新工艺。该工艺以氰乙酸乙酯为原料,经732型阳离子交换树脂催化,通过水解制备固体氰乙酸。考察了反应温度,反应时间,氰乙酸乙酯和水的质量比和氰乙酸乙酯和树脂的质量比对反应的影响。结果表明,最佳的反应条件为:反应温度为90℃,反应时间为10h,水酯质量比为1∶1,酯与树脂质量比为10∶4.5,在该条件下,氰乙酸的最高收率可达88.9%。
A new process of synthesizing solid cyanoacetic acid is introduced. The process of ethyl cyanoacetate as raw material, the 732-type cation exchange resin catalysis, prepared by hydrolysis of solid cyanoacetic acid. The effects of reaction temperature, reaction time, the mass ratio of ethyl cyanoacetate to water and the mass ratio of ethyl cyanoacetate to resin on the reaction were investigated. The results showed that the optimal reaction conditions were as follows: the reaction temperature was 90 ℃, the reaction time was 10h, the mass ratio of water ester was 1: 1, the mass ratio of ester to resin was 10:4.5. Under this condition, the highest yield of cyanoacetic acid Rate up to 88.9%.