用一氯乙酸生产乙醇酸的工艺,包括用一氯乙酸与碳酸钠经水解、浓缩、降温、甩料,得到固体乙醇酸粗品的粗加工过程,关键是:所述的工艺在粗加工过程的基础上,再进行精制加工过程,包括:a、将固体乙醇酸粗品与甲醇以重量比为1∶(3~5)的比例混料,b、在50~55℃下充分进行溶解,并保持0.3~1小时,c、冷却降温至1~3℃,甩料后得到固体与液体两 The process of producing glycolic acid from monochloroacetic acid includes the steps of crude solution of crude glycolic acid obtained from the hydrolysis, concentration, cooling and rejection of monochloroacetic acid and sodium carbonate. The key point is that the process described in the roughing process , Based on the further refining process, comprising: a, the solid crude glycolate mixed with methanol in a weight ratio of 1: (3 ~ 5) ratio, b, fully dissolved at 50 ~ 55 ℃, and maintained 0.3 ~ 1 hour, c, cooling and cooling to 1 ~ 3 ℃, after the rejection of the solid and liquid two