By using the by-product calcium hydrogen phosphate from the production of gelatin and industrial grade potassium sulfate as raw materials, potassium dihydrogen phosphate was prepared by double decomposition method. With single factor experiment,the effects of reaction time, reaction temperature, volume/mass ratio of liquid to solid, and amount-of-substance ratio of phosphorus to potassium on phosphorus and potassium yields in the process of preparing potassium dihydrogen phosphate were investigated. Experiment results showed better process conditions were as follows; reaction time was 120 min,reaction temperature was 60 ℃ , volume/mass ratio of liquid to solid was 4 mL/g,and amount of-substance ratio of potassium to phosphorus was 1.3. Process conditions were optimized through orthogonal experiment, and the experimental results showed the optimal reaction conditions were as follows; reaction time was 130 min, reaction temperature was 50 ℃ , volume/mass ratio of liquid to solid was 4. 5 mL/g,and amount-of-substance ratio of potassium to phosphorus was 1. 3. Yields of phosphorus and potassium could reach 81. 15% and 97. 89% respectively under those conditions.%以明胶生产中副产的磷酸氢钙和工业级硫酸钾为原料,采用复分解法制取了磷酸二氢钾.通过单因素实验考察了反应时间、反应温度、液固体积质量比及钾磷物质的量比等因素对制备磷酸二氢钾过程中的磷收率和钾收率的影响.实验结果表明较佳的工艺条件:反应时间为120 min,反应温度为60℃,液固体积质量比为4 mL/g,钾磷物质的量比为1.3.通过正交试验优化了工艺条件,实验结果表明最优的条件:反应时间为130 min,反应温度为50℃,液固体积质量比为4.5 mL/g,钾磷物质的量比为1.3,在此条件下磷的收率可达到81.15％,钾的收率可达到97.89％.
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