钙化法制备草酸的最佳工艺条件

The Optimum Process Conditions for Preparing Oxalic Acid by Calcification Method

研究了钙化法制备草酸的工艺条件,并确定了其钙化反应的最佳工艺条件:配料比(Na2C2O4:Ca(OH)2)为1:1.15,反应时间为1h～3h,反应后NaOH质量浓度为95g/L,其中对转化率影响最大的因素为配料比;酸化反应的最佳工艺条件为:反应温度为80℃,配料比(CaC2O4:H2SO4)为1:1.25,反应时间为1h,硫酸初始质量分数为35%。

The process conditions of oxalic acid preparation using calcification method were studied. The optimum conditions are as following： the ratio of Ca（OH）2 to Na2C2O4 is 1.15; the reaction time is lhour-3hours and the mass concentration of NaOH after reaction is 95g/L. Among all those, the most important influencing factor on the conversion rate is the ratio of different raw materials. The optimum conditions for acidification reaction are： the reaction temperature is 80%; the ratio of H2SO4 to CAC2O4 is 1.25; the reaction time is 1 hour and the initial mass fraction of H2SO4 is 35%