ABSTRACT
This chapter discusses the literature on the production of monoammonium phosphate (MAP). Information on the formation of citrate-insoluble phosphates in the production of MAP and the use of MAP in the production of granular NPK fertilizer is also included. In the early stage of production of ammonium phosphates, a granular 11-48-0 grade of MAP was one of the main products. In 1967 Young and Hicks reported on pilot-plant studies of the production of granular MAP in facilities built for the TVA granular diammonium phosphate process. Achorn and Salladay described tests in a conventional Tennessee Valley Authority (TVA)-type ammoniation-granulation plant in which a pipe-cross reactor was used in the production of a granular 12-48-0 grade of MAP. In 1972 the TVA demonstrated the use of powdered MAP in the production of granular NPK fertilizer in a granulation pilot plant. In 1973 Peng described commercial-scale production of granular compound fertilizers using nongranular MAP in the formulations.
