Production of urea-ammonium polyphosphates from urea phosphate

摘要

Crystalline urea phosphate mixed with sufficient quantities of previously produced urea-ammonium polyphosphate liquid to provide fluidity is pyrolyzed batchwise in one stage to give molten urea ammonium polyphosphate containing up to 50 percent of the phosphate as polyphosphate. Water or aqua ammonia can be substituted for the polyphosphate liquid if certain prescribed steps in proper sequence are followed. Heat from ammoniation of the urea phosphate provides all of the heat for pyroloysis. The molten urea-ammonium polyphosphate is then processed into high-analysis liquid fertilizer.