Hydroxylammonium phosphate

Purification can be effected by dissolving the wet crystals (total yield of crude product) in 1750 ml. of water at 80 to 85°, cooling to about 15° to effect crystallization, followed by filtration and washing. The recrystallized compound is dried as recommended above. About 140 to 145 g. (72 per cent) of a product with a purity of 98 per cent is obtainable in this manner. 

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Reduction of the phosphoric acid/ammonium nitrate buffer solution with hydrogen and formation of hydroxylammonium phosphate ... 

NH30H]2C204 Hydroxylammonium oxalate, 3 83 [NIIjOHJsAsOa Hydroxylammonium arsenate, 3 83 [NH30H]3P04 Hydroxylammonium phosphate, 3 82 NH4N3 Ammonium azide, 2 136, 137... 

Hydroxalamine disulfonic acid, 193 Hydroxylamine phosphate oxime (HPO), 219 Hydroxylamine sulfate, 192-194, 219 Hydroxylammonium phosphate, 219, 220 Hydroxylated polyesters, 160 Hypochlorus acid, 149... 

A solution of 500 g. NEsPO I2H3O is prepared in one liter of hot water. The filtered solution is added to a filtered solution of 273 g. of (NHgOHlCl in 600 ml. of hot water. The mixture is allowed to cool and is suction-filtered. Approximately 200 g. of hydroxylammonium phosphate is obtained. Further hydroiqrlammonium phosphate can be Isolated from the mother liquor by evaporation, givit a total yield of about 90%. 

Can be prepared in the same manner as hydroxylammonium phosphate by substituting a solution of 312 g. of NasHAsO 7HgO in 300 ml. of HgO for the phosphoric acid. For neutralization a solution of 40 g. of NaOH in 100 ml. of HgO (efficient coolit not necessary) is required. The crystals are washed three times with 150 ml. of water. The yield is 200-210 g. of 95% salt. After purification by recrystallization from an eightfold volume ofwater, the yield of 98% pure salt is about 145 g. Formula weight 241.03. 

Tertiary hydroxylammonium phosphate (20 g.) is placed in a 100-ml. distillation flask. Coarse salt, such as that obtained by seedily, is preferably used. The full scale of the thermometer Inserted in the neck of the flask should be above the stopper (stem correction thermometer) the bulb reaches almost to the bottom of the flask. The flask is connected to an aspirator via a receiver. An in-line manometer is essential. The apparatus is evacuated to 13 mm. and heated carefully with an open flame. Some salt dust is readily carried over in the beginning, and this results in con-tamin ion of the product. If the receiver is cooled, the product immediately solidifies, and characteristic, pointed crystals form. The bulk of the material distills over at 13 mm. at a thermometer reading of 135-137°C. The flask is heated intermittently until the... 

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