Chemistry: fertilizers – Processes and products – Organic material-containing
Patent
1993-01-08
1994-05-03
Lander, Ferris
Chemistry: fertilizers
Processes and products
Organic material-containing
71 30, 71 6411, C05C 900, C05C 902
Patent
active
053083733
ABSTRACT:
A method of preparing a new granular homogeneous metal ammonium phosphate-alkylene urea buffered fertilizer, containing slow releasing water insoluble nitrogen of two types which provide sustained nitrogen release. The method is based on the discovery that a strong metal ammonium phosphate matrix may be formed to homogeneously contain fine particles of alkylene urea compounds. The new buffered fertilizer provides concentrated slow release nitrogens, and phosphate, and buffering amounts of metal nutrients. The alkylene urea may be formed in-situ from liquids concommittantly with the formation of the metal ammonium phosphates, or it may be admixed as finely divided alkylene urea solids. The preferred alkylene ureas are methylene ureas and polymers, isobutylene diurea, and crotonylidene diurea. The metal nutrients are divalent and are preferably magnesium, manganese, zinc, and iron reacted as oxides, hydroxides, or carbonates. The ammonium ion is supplied in the method as anhydrous ammonia, ammonium hydroxide, and preferably as ammonium phosphate. The phosphate is supplied as phosphoric acids, ammonium phosphate, or preferably as a combination of phosphoric acid and ammonium phosphate. The method is most effectively carried out in a high intensity mixer-reactor, comprising a cylindrical pan rotating around a near-vertical center containing a smaller diameter mixer rotating at a high rate of speed relative to that of the pan. The magnesium, ammonium, and phosphorous entities are reacted at about a mol ratio of 1.0 to 1.0 to 1.0 at about the boiling point of water, and at about atmospheric pressure to form a new fertilizer composition containing between 14 and 30 percent nitrogen with between 40 and 80 percent of the nitrogen insoluble in cold water and buffered to a pH between 6.0 and 8.0.
REFERENCES:
patent: 4378238 (1983-03-01), Goertz
patent: 5019148 (1991-05-01), Moore
Bridger, Salutsky and Starostka, Metal Ammonium Phosphates as Fertilizers, Ind. Eng. Chem. Process Des. Dev. vol. 10, No. 3, May-Jun. 1962, pp. 181-188.
Peng, Ernst, Bridger, and Hartley, Slow Release Fertilizer Materials Based on Magnesium Ammonium Phosphate, Ind. Eng. Chem. Process Des. Dev, vol 18, No. 3, 1979, pp. 453-458.
Lander Ferris
The Vigoro Corporation
LandOfFree
Metal ammonium phosphate-alkylene urea buffered fertilizer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Metal ammonium phosphate-alkylene urea buffered fertilizer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Metal ammonium phosphate-alkylene urea buffered fertilizer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2111894