反应详情

The process of the invention enhances the production of a narrow range of granular diammonium phosphate particle size distribution comprising reacting anhydrous ammonia and aqueous phosphoric acid in a reactor to obtain a reaction product slurry of monoammonium phosphate and diammonium phosphate. The slurry is further reacted in a rotating drum granulator-reactor with anhydrous ammonia to yield a moisture containing diammonium phosphate. The moisture containing diammonium phosphate is introduced into a rotating drum dryer to remove the moisture from the diammonium phosphate resulting in a dried granular diammonium phosphate mixture. The dried solid granular diammonium phosphate is fed into a classifying means for separating into oversize, undersize and product granular diammonium phosphate. The oversize is milled and recycled along with the undersize obtained from the classifying means back to the granulator-reactor. The desired granular size is collected from the classifying means to be stored, packaged or shipped. The improvement of the conventional process comprises diverting a portion of the dried solid granular diammonium phosphate mixture after drying and prior to delivery of the dried solid granular diammonium phosphate to the classifying means and feeding the diverted portion to the granulator-reactor and setting the classifying means to a narrow size separation whereby a narrow range of the particle size distribution of granular diammonium phosphate produced is enhanced.