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
Varying latency timers in a wireless communication system
Method for producing lactamates by way of thin film evaporation
Organizer
Multi-contoured yoga support
LED illumination control using a simple digital command structure
Adaptive input interface
Methods and compositions for wound healing
  Randomly Featured Patents
Asphalt-based coating composition with alkoxylated amine-derived salt surfactant
Composition for radical polymerization and method of forming pattern using the composition
Fume hood controller
Copy machine
Image processing device and image processing method
Method for making surveillance devices with multiple capacitors
Tackifiers for elastomers
Tree mounted well flow interface device
Chain for slide fastener
Printing method and system for making a print from a photo picture frame and a graphic image written by a user