Chemistry: fertilizers – Processes and products – Organic material-containing
Patent
1981-11-05
1983-08-09
Lander, Ferris H.
Chemistry: fertilizers
Processes and products
Organic material-containing
71 40, 71 43, 71 6408, 564 63, 564 73, 564 75, C05C 900
Patent
active
043976751
ABSTRACT:
Stable, urea-sulfuric acid reaction products of predetermined composition containing mono- and/or diurea sulfates and less than 35 weight percent water are produced from concentrated, urea-sulfuric acid reaction product feeds of different compositions by simultaneously and separately adding a selected feed solution and reactant urea and/or sulfuric acid, and optionally water, to a reaction zone in stoichiometric proportions so that the composition of the total feed to the reaction zone corresponds to the predetermined composition. Reaction temperature is maintained at a level below the incipient decomposition temperature of the predetermined composition, and the resulting products are essentially or completely free of sulfamic acid and/or ammonium sulfamate. Depending upon the relative proportions of unreacted sulfuric acid and urea in the total feed, the reaction may be exothermic or endothermic and, when desired, the otherwise endothermic reactions can be made exothermic by the reaction of excess urea and sulfuric acid to autogenously maintain the desired reaction temperature.
REFERENCES:
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patent: 4116664 (1978-09-01), Jones
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D. F. du Toit, Verslag Akad. Wetenschappen, 22, 573-574 (abstracted in Chemical Abstracts, 8, 2356, 1914).
L. H. Dalman, "Ternary Systems of Urea and Acids, I: Urea, Nitric Acid and Water, II: Urea, Sulfuric Acid and Water, III: Urea, Oxalic Acid and Water; JACS, 56, 549-593 (1934).
Sulfur Institute Bulletin, No. 10 (1964), "Adding Plant Nutrient Sulfur to Fertilizer".
William Lohry, "Techniques of Manufacturing Hot Mix Suspensions", National Fertilizers Association, Round-Up Papers, (1968), pp. 34-38.
Laird Michael H.
Lander Ferris H.
Sandford Dean
Union Oil Company of California
Wirzbicki Gregory F.
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