Granular ammonium phosphate sulfate and monoammonium phosphate using

Abstract

A process for the production of fertilizers from phosphoric and sulfuric acids, liquid anhydrous ammonia, and water. The ammonia is premixed with a small quantity of water in a common pipe; the resulting mixture is subsequently mixed downstream of said common pipe with the acids introduced to the pipe through a pipe cross. The acids and aqua ammonia react in the pipe cross and extension of the pipe beyond the cross. Overall length of the pipe reactor is 7 feet and it is cooled by a water jacket. In another variation of the process, the cooling water jacket is not used and the reaction tube is made of either Hastelloy C metal or Teflon-lined mild steel pipe. Slurry from the reactor is granulated with recycle fines, additional phosphoric and sulfuric acids, and ammonia in a rotary drum. Product from the granulator is cooled and screened for product size removal. Equipment is uncomplicated, easy to operate, and inexpensive. Ammonium phosphate sulfate grades such as 6-24-24, 12-12-12, 8-32-16, 8-22-11 and monoammonium phosphate 12-48-0 have been produced with this process.