高纯度次磷酸制备新工艺研究

Study on Preparation Process of High Pure Hypophosphorous Acid

研究了以工业次磷酸钠为原料,沉淀法去除Cl-,SO42-,重金属等杂质离子,再经过离子交换树脂制得高纯的次磷酸的工艺。探讨了除Cl-,搅拌反应时间和交换速度等最佳工艺条件。结果表明,去除Cl-时,Ag2SO4应略多于理论值,pH值为中性,温度为室温;离子交换速度以体积流量2mL/min为宜。

High purity hypophosphorous acid is prepared from industrial sodium hyp ophosphite through deposition to re move impurities,such as Cl - ,SO 42- ,heavy metals,and through ion -exch ange resins.Best conditions to remo ve Cl - ,mixing reaction time and exchange speed are explored.The results show when Cl - is being removed,Ag 2 SO 4 should be more than theory value,pH i s mild,temperature is room temperature;Ion -exchange rate is good at 2mL /min of volume flow.