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Abstract

In a preferred embodiment, a triazone mixture contains triazone present in an amount of at-least about 30% calculated on a dry weight basis of 100% solids, methylene diurea in an amount less than about 2%, monomethylolurea in an amount less than about 3%, and total methylene diurea and monomethylolurea taken-together being less than about 3%, and hexamethylenetetramine in an amount less than about 0.5%, in water solution, of which on a dry weight basis the ratio of triazone to methylene diurea is at-least about 13 and the ratio of triazone to urea is greater than about 0.5, of which typically about 80% of the triazone present is of the emperical formula C.sub.3 M.sub.7 N.sub.3 O in cyclic form, and a majority of remaining triazone present is of the emperical formula C.sub.5 M.sub.10 N.sub.4 O.sub.3 in cyclic substituted-amine form, the triazone mixture being produced by a two-stage method in which urea and/or substituted urea is reacted with aldehyde(s) and ammonia and/or primary amine(s) with the urea to formaldehyde ratio ranging from preferably about 1.2 to 1.6, and with ammonia on a weight percentage of the batch being at preferably about 3.0% to about 3.5%, such that total nitrogen in solution ranges between about 16 and 31% by weight, the first stage including heating reactants within a preferred range of about at-least 91 degrees Centigrade up to about 93 degrees Centigrade while maintaining pH at about pH 8.8 to about pH 9.2 by the continual addition of strong caustic such as sodium hydroxide over a heating period ranging preferably from about 28 to about 35 minutes, and the second stage proceeding at about the same temperature devoid of further addition of a caustic permitting pH to drop during a continued heating over a period of perferably from about 40 minutes to about 50 minutes, optimum mole ratio during the process of reactants urea, formaldehyde and ammonia, for example, being about 1.6/1.0/0.28.

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First Claim