萃取法制备磷酸二氢钾  

Preparation of potassium dihydrogen phosphate by extraction method

作　　者：刘逸飞[1] 李军[1] 李燕凤[1] 段潇潇[1] 

机构地区：[1]四川大学化工学院,四川成都610065

出　　处：《无机盐工业》2007年第9期24-26,共3页Inorganic Chemicals Industry

摘　　要：研究了以热法磷酸和氯化钾为原料,利用有机溶剂萃取法制备磷酸二氢钾的新方法。研究了萃取时间、原料溶液磷酸质量分数、萃取剂用量对产品收率、纯度及氯离子含量的影响,确定了适宜的工艺条件。实验结果表明,原料液磷酸质量分数22.69%,三正丁胺30 mL,20℃下萃取60 min,得到磷酸二氢钾产品的收率可达到95.883%,五氧化二磷质量分数52.000%,纯度99.714%,氯离子质量分数0.133%。该方法具有产品纯度高,工艺流程短,操作简便等优点。A new method for preparation of potassium dihydrogen phosphate （KDP） from phosphoric acids by thermal process and potassium chloride by organic solvent extraction method was studied. The influences of extraction time,H3PO4 mass fraction in material solvent and quantity of extraction liquid on the yield, purity and Cl^- content of the products were investigated,and the optimum conditions were confirmed. The experimental results indicated that, the KDP product＇s yield was 95. 883% ,P205 mass fraction was 52. 000% ,purity was 99. 714% ,and Cl^- mass fraction was 0. 133% while under the conditions that the mass fraction of HsPO4 was 22.69% ,the volume of the TBuA was 30 mL,the time of extraction was 60 min and the temperature was 20 ℃. The advantages of this method were the purity of product was high, process flow was short, and operation was simple etc..

关 键 词：萃取法 磷酸二氢钾 三正丁胺 

分 类 号：TQ131.13[化学工程—无机化工]