Ammonium polyphosphate sulfate fertilizers from wet-process phosphoric acid

摘要: A process for the production of fluid fertilizers (suspensions and/or solution type) made from merchant-grade phosphoric acid (50-58 percent P 2 O 5 ), sulfuric acid, liquid anhydrous ammonia, and water, wherein ammonia is heated in heat exchange means juxtaposed hot fertilizer product to form gaseous which along with fed a pipe-cross reactor melt ammonium polyphosphate sulfate formed, subsequently mixed cooled recycled produce N:P weight ratios ranging about 0.3 1, contains 10 60 its values polyphosphates 3 8 by sulfur. About 45 as easily attainable ambient feed temperatures, i.e., 50° F. 100° F., versus prior-art teachings only 15 poly formation preheat acids. It when it produced, diluted can be stored at 40° without troublesome crystals. When gelling clay added, stores well suspension remains temperatures low -25°