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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, methylenediurea in an amount less than about 2%, monomethylolurea in an amount less than about 3%, and total methylenediurea and monomethylolurea taken-together being less than about 5%, and hexamethylenetetramine in an amount less than about 1%, in water solution, of which on a dry weight basis the ratio of traizone to methylenediurea is at-least about 6 and the ratio of triazone to urea is greater than about 1, of which typically about 80% of the triazone present is of the emperical formula C.sub.3 H.sub.7 N.sub.3 O in cyclic form, and a majority of remaining triazone present is of the emperical formula C.sub.5 H.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 0.5 to 1.4, and with ammonia on a weight percentage of the batch being at preferably about 4% to about 6%, 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 87 degrees Centigrade up to about 92 degrees Centigrade while maintining pH at about pH 8.5 to about pH 9 by the continual addition of strong caustic such as sodium hydroxide over a heating period ranging preferably from about 20 to about 30 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 preferably from about 10 minutes to about 30 minutes, optimum mole ratio during the process of reactants urea, formaldehyde and ammonia, for example, being about 1.2/1.0/0.5.

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First Claim