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以VOSO_4为原料,使之与α-羟基乙酸在水溶液中反应,逐渐加入KOH至pH=5,溶液经浓缩后
With VOSO_4 as raw material, make it react with α-hydroxyacetic acid in aqueous solution, gradually add KOH to pH = 5, after the solution is concentrated