Chemistry: fertilizers – Processes and products – Organic material-containing
Patent
1981-11-05
1984-05-01
Lander, Ferris H.
Chemistry: fertilizers
Processes and products
Organic material-containing
71 6408, 71 6410, 564 39, 564 73, C05C 900
Patent
active
044459254
ABSTRACT:
Stable concentrated solutions of urea and sulfuric acid containing mono- and/or diurea sulfates and less than 35 weight percent water, free of sulfamic acid and/or ammonium sulfamate, are produced by a unique process that involves the simultaneous and separate addition of urea, sulfuric acid and optionally water to a reaction zone at controlled rates and in stochiometric proportions equivalent to the composition of the desired product, and maintaining reaction temperatures below the incipient decomposition temperature for the particular composition. The heat generated by the highly exothermic reaction can be removed by cooling the liquid phase during the course of the reaction by direct air heat exchange with only nominal, if any, atmospheric emissions.
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Laird Michael H.
Lander Ferris H.
Sandford Dean
Union Oil Company of California
Wirzbicki Gregory F.
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