公开(公告)号：US20120094344A1

公开(公告)日：2012-04-19

申请号：US13330383

申请日：2011-12-19

申请人： Hidenori HINAGO ,  Hajime Nagahara ,  Toshiya Aoki

发明人： Hidenori HINAGO ,  Hajime Nagahara ,  Toshiya Aoki

IPC分类号： C12P7/42

CPC分类号： C12P7/42 ,  C07C51/08 ,  C07C51/412 ,  C07C59/06

摘要： 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.

摘要翻译： 本发明提供了一种乙醇酸的制备方法，其具有由甲醛和氢氰酸制备乙醇腈的第一步骤，第二步是直接或通过乙醇酸盐将乙醇腈水解成乙醇酸，该方法可以在容易的生产和纯化步骤中生产乙醇酸 同时消耗更少的能量。 在制造方法中，通过连续进行第一和第二工序，或者将第一工序中得到的乙醇腈的pH保持在4以下，进行pH5〜9的第二工序的水解反应， 乙醇酸，乙醇酸的生成活性和乙醇酸的累积浓度得到改善，导致纯度和质量提高的乙醇酸的生产。