Preparation of potassium dihydrogen phosphate from industrial monoammonium phosphate
High purity potassium dihydrogen phosphate products are prepared with industrial monoammonium phosphate and potassium chloride as raw materials,the effects of reaction conditions on the purity and yield of products are investigated.The optimum conditions of reaction stage are as follows:The molar ratio of industrial monoammonium phosphate to potassium chloride is 1.00∶1.40,reaction temperature is 100℃,filtration temperature is 30℃.The evaporation of recrystallization is 75%,the filtration temperature is 40℃during purification stage;After the recrystallized solid is prepared into a solution and extracted with methanol according to the volume ratio of 1.5∶1.0,potassium dihydrogen phosphate with a single yield of 48.26%and purity of 99.88%can be obtained.The residual liquid at all levels of the reaction can be used as raw materials,and the extraction agent can be recovered by distillation,there is no waste of resources in the whole process.
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