FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing phosphotungstic acid. Method involves preparing a solution containing tungsten, phosphorus and an inorganic acid and mixing it with an organic oil phase containing alcohol for extraction. Then, the obtained supported organic phase is purified by distilled water with volume ratio of oil and water phases from 3:1 to 10:1 to obtain a cleaning solution. Further, crystallisation is carried out by thermal evaporation or spray-drying to obtain a crystal of phosphotungstic acid. Organic alcohol used is C7-C20 alcohol. Addition of an inorganic acid to a solution of phosphorus or tungsten, as well as use of organic alcohol as an extractant leads to simultaneous and efficient extraction of phosphotungstic acid. Oil phase containing organic alcohol has excellent selectivity with respect to molecules of phosphotungstic acid in mixed solution.
EFFECT: after-purification inorganic phase does not contain impurities and can be recycled directly.
14 cl, 25 ex
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