Process for preparing sodium ammonium hydrogen-phosphate and amm

Details Process for preparing sodium ammonium hydrogen-phosphate and amm Process for preparing sodium ammonium hydrogen-phosphate and amm

1977-08-09

1978-09-26

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423310, 423470, C01B 1516, C01B 2526, C01C 116

Patent

active

041170890

ABSTRACT:
Highly pure sodium ammonium hydrogenphosphate and ammonium chloride are prepared from wet process phosphoric acid. A mixture of phosphoric acid, ammonia and/or sodium chloride is added to a circulating mother liquor, to which is additionally added ammonia until the pH of the liquor reaches 5.5 to 9.0. The liquor is then cooled to cause sodium ammonium hydrogenphosphate to crystallize at 30.degree. to 60.degree. C. The resulting filtrate is added with an acidic compound to adjust its pH to 5.6 to 6.4 whereby the solubility of the hydrogenphosphate is increased while that of ammonium chloride is reduced to a minimum. The filtrate is cooled to 5.degree. to 50.degree. C to precipitate ammonium chloride as crystals without involving co-precipitation of the hydrogenphosphate. The filtrate from which the ammonium chloride crystals have been removed is recycled for use as a circulating mother liquor.

REFERENCES:
patent: 3531242 (1970-09-01), Hayakawa et al.
patent: 3619133 (1971-10-01), Fukuba et al.

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