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
System and method for providing advertising content using a group training system
System and method for providing radio communication in a land mobile radio system
Methods and apparatuses for anti-shading correction with extended color correlated temperature dependency
Projection screen and projection system having the same
Method and apparatus to select a profile of a digital communication line
Developing device
Signal transfer apparatus
  Randomly Featured Patents
Liquid crystal display device having external connecting wirings and auxiliary wirings
Packaging label
Rail plug
Radiation detector, method of manufacturing a radiation detector, and lithographic apparatus comprising a radiation detector
High spatial resolution matrix assisted laser desorption/ionization (MALDI)
Flame combustion of carbonaceous fuels
Organoleptic compounds and their use in perfume compositions
Branch look ahead adder for use in an instruction pipeline sequencer with multiple instruction decoding
Module for parallel lighting and balancer coil for discharge lamp
Blade for ice skate