The dissociation pressures of the orthophosphates of ammonia.

During the summer ot 1925 the writer was employed by the Niagara Ammonia Company 1n their Casale plant at Nlagara Falls, N.Y. At that time they were making aqua ammonia and anhydrous ammonia for refrigeration purposes, but had made no attempt to enter the fertilizer market. Nevertheless, it was real1zed that the competition of other synthetic ammonia plants and of the by-product producers would soon satisty the demand for refrigeration ammonia and force some or all of the competitors to begin fertilizer manutacture. The Phosphorus-Hydrogen company, also of Niagara Falls, is closely connected with the Niagara Ammonia Company and is developing a method for the simultaneous manufacture of hydrogen andphosphoric annydride. Two such units, one producing ammonia and the other hydrogen and phosphoric acid, could be run economically in conjunction with a fert1l1zer plant. For this reason the manufacture of ammonium phosphate, from gaeous or liquid ammonia and concentrated phosphoric ac1d, is of the greatest interest, especially to the above mentioned companies. [...