Production process of disodium hydrogen phosphate
A technology of disodium hydrogen phosphate and sodium ammonium phosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problem of high production cost, and achieve the effect of reduced production cost and simple process
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[0013] A method for producing disodium hydrogen phosphate, it comprises the following steps:
[0014] a. Neutralization and purification of wet-process phosphoric acid: add ammonia water to wet-process phosphoric acid for neutralization, and then desulfurize with barium carbonate. Metal impurities in wet-process phosphoric acid will precipitate in the form of phosphate or hydroxide, and sulfate will be difficult to form Dissolved barium sulfate is precipitated and filtered to obtain a mixed solution of pure monoammonium phosphate and diammonium phosphate;
[0015]
[0016]
[0017] b. Crystallization and separation of sodium ammonium phosphate: add sodium chloride to the mixed solution of monoammonium phosphate and diammonium phosphate generated in step a, adjust the pH to 8 with soda ash, and filter and wash after cooling to 15°C to obtain sodium ammonium phosphate crystals , the filtrate component is ammonium chloride, and ammonium chloride is recovered b...
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