从制药厂废水中提取草酸的工艺研究

Technology of extracting oxalic acid from waste water in pharmaceutical plants

通过正交实验 ,找出了提取草酸的优化操作工艺条件 :沉淀剂的加入过量系数为 1 2～ 1 3 ,反应终点pH值 3～ 4 ,反应时间 30min ,反应温度 50℃。中试工业化实验中草酸的提取率达 90 %以上 ,所得到的草酸的质量达到GB1 62 6 -

Following optimal operation conditions are found through orthogonal tests: the excess coefficient of added precipitator 1.2～1.3, the pH value at the reaction end 3～4, the reaction time 30min and the reaction temperature 50℃. The yield of oxalic acid is over 90% in pilot tests and the product quality meets GB1626-88 standard for the firstgrade product.