Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method for producing fertilizer grade DAP having an increased nitrogen concentration from recycle










Image Number 8 for United States Patent #6241796.

A process for the preparation of granular fertilizer grade DAP (a product composed of ammonium phosphates, principally diammonium phosphate, resulting from the ammoniation of phosphoric acid, as defined in Official Publication No. 52 of the Association of American Plant Food Officials, dated 1999) comprising partially preneutralizing orthophosphoric acid with ammonia, completing the ammoniation of the orthophosphoric acid with ammonia in a rotary ammoniator-granulator to provide granular DAP, sizing the granular DAP to provide the granular DAP product, reducing the particle size of the oversized granular DAP, and recycling the undersized granular DAP and the sized-reduced oversized granular DAP to the ammoniator-granulator. The ammoniacal nitrogen concentration of the granular DAP recycle, hence the granular DAP product, is enhanced by subjecting the finely-divided recycled granular DAP to anhydrous gaseous ammonia which is at a super atmospheric pressure and which is at a temperature sufficient to maintain said anhydrous ammonia in the gaseous state. The increase in the ammoniacal nitrogen concentration is a function of the absolute ammonia pressure, the initial moisture content of the granular DAP recycle, and the contact time of the ammonium with the granular DAP recycle.








 
 
  Recently Added Patents
Solid-state imaging apparatus and imaging system
Placental tissue grafts
Ultrathin fluid-absorbent cores
System and method for redundant array copy removal in a pointer-free language
Documentation roadmaps and community networking for developers on large projects
Catalyst composition comprising shuttling agent for ethylene multi-block copolymer formation
Satellite fleet deployment
  Randomly Featured Patents
Fabric with decorative pattern
Apparatus for measuring oxygen consumption and the exchange of other breathing gases
Apparatus for the rapid development of photosensitive printing elements
Apparatus for merging spatial audio streams
Vertical aerogenerator vane
Adhesive system for production of spiral wound membrane elements for use in organic fluid mixture separations
Method and computer program for selecting circuit repairs using redundant elements with consideration of aging effects
Use of creatine and/or creatine derivatives for treating typical disorders in women
Hand control mechanism to produce a selectively changeable effect on a continuously variable input shaft
System for enterprise-wide work flow automation