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    • 1. 发明公开
    • Method for producing glycolic acid
    • 生产乙醇酸的方法
    • EP2361900A2
    • 2011-08-31
    • EP11162394.8
    • 2006-05-25
    • Asahi Kasei Chemicals Corporation
    • Hinago, HidenoriNagahara, HajimeAoki, Toshiya
    • C07C51/08C07C59/06C12P7/42
    • C12P7/42C07C51/08C07C51/412C07C59/06
    • Provided is a production method of glycolic acid having a first step of preparing glycolonitrile from formaldehyde and hydrocyanic acid and a second step of hydrolyzing the glycolonitrile into glycolic acid directly or via a glycolate salt, which method can produce glycolic acid in easy production and purification steps while consuming less energy. In the production method, by carrying out the first and second steps continuously or by storing the glycolonitrile obtained in the first step at pH 4 or less and carrying out a hydrolysis reaction of the second step at from pH 5 to 9, a production yield of glycolic acid, activity for the production of glycolic acid and accumulated concentration of glycolic acid are improved, resulting in the production of glycolic acid having an improved purity and quality.
    • 本发明提供一种乙醇酸的制造方法,该制造方法具有从甲醛和氢氰酸制备乙醇腈的第一工序和将乙醇腈直接或经由羟基乙酸盐水解成乙醇酸的第二工序,该制造方法在制造和纯化工序中容易制造乙醇酸 同时消耗更少的能量。 在制备方法中,通过连续进行第一和第二步骤或通过将在第一步骤中获得的乙醇腈储存在pH4或更低并且在pH5到9进行第二步骤的水解反应,生产产率 乙醇酸,乙醇酸生产活性和乙醇酸累积浓度得到改善,导致生产具有改善的纯度和质量的乙醇酸。