Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Production of urea-ammonium polyphosphates from urea phosphate
T998001 Production of urea-ammonium polyphosphates from urea phosphate
Patent Drawings:Drawing: T998001-2    Drawing: T998001-3    Drawing: T998001-4    
« 1 »

(3 images)

Inventor: Stinson, et al.
Date Issued: September 2, 1980
Application: 06/071,436
Filed: August 31, 1979
Inventors: Burnell; James R. (Killen, AL)
Stinson; John M. (Sheffield, AL)
Assignee:
Primary Examiner:
Assistant Examiner:
Attorney Or Agent:
U.S. Class: 423/315; 564/32; 71/29; 71/64.1
Field Of Search:
International Class:
U.S Patent Documents:
Foreign Patent Documents:
Other References:









Abstract: A batch process is disclosed for the production of relatively pure urea ammonium polyphosphate liquid fertilizers from crystalline urea phosphate made from wet-process acid and urea. Initially, crystalline urea phosphate is fed to a tank where it is combined with previously produced liquid product; the latter is added to provide fluidity for agitation. The mixture is then ammoniated batchwise in one stage to pyrolyze the urea phosphate to condense orthophosphate to polyphosphate and form molten urea-ammonium polyphosphates. Pyrolysis takes place at relatively low temperatures of 220.degree. F. to 300.degree. F. and heat from ammoniation of the urea phosphate crystals provides all the heat to effect the condensation. The molten pyrolyzate which contains mixtures of urea, ammonium orthophosphate, and ammonium polyphosphate is dissolved in an ammonia-water mixture to yield high-analysis liquid fertilizer that contains 10 to 15 percent nitrogen and 16 to 30 percent P.sub.2 O.sub.5 ; 10 to 50 percent of the phosphate is present as polyphosphate. The liquid fertilizer is then cooled. Supplementary micronutrient-containing materials may be incorporated in the liquid product. Total batch cycle time varies from about 20 to 45 minutes.
Claim:
Description:
 
 
  Recently Added Patents
Picture quality control method and image display using same
Image scanner and image forming apparatus
Hepodxilin analog enantiomers
Face recognition through face building from two or more partial face images from the same face
Touch sensing technology
Module-code verification layer to automatically validate user input
Generating agricultural information products using remote sensing
  Randomly Featured Patents
Micro-stream rotator with adjustment of throw radius and flow rate
Chip scale package and method for manufacture thereof
Compositions for co-administration of interleukin-3 mutants and other cytokines and hematopoietic factors
Device particularly useful for cutting or grinding round girdles of gems
Sound provider adapter to cancel out noise
Gate valve
Office gym exercise kit
Image forming device
Evaporative gas cooling system and method
Image registration for a raster output scanner (ROS) color printer