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
Case for electronic device
Fuser member having composite outer layer
Verbena plant named `Duempsopicha`
Traffic flow analysis mitigation using a cover signal
Collaborative system for capture and reuse of software application knowledge and a method of realizing same
Semiconductor device having a plurality of elements on one semiconductor substrate and method of manufacturing the same
System and method for redundant array copy removal in a pointer-free language
  Randomly Featured Patents
N-lower alkyl neodecanamide insect repellents
Coupling mechanism for headrest of vehicle seat
Data transmission method for embedded data, data transmitting and reproducing apparatuses and information recording medium therefor
Photoconversion of gasified organic materials into biologically-degradable plastics
Systems of diagnosing cervical cancer
Body structure for a rear carriage of a convertible
Stationery organizer
Integrated memory
Neutralizing apparatus and image forming apparatus having the neutralizing apparatus
Magnetoelectric generator