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The following series of tests was carried out in a static bed, i.e. without continuous mixing of the reactants. Urea and sodium carbonate were reacted in a molar ratio of 1.7:1 to form an intermediate sodium cyanate-sodium carbonate mixture having the composition 75.0% NaCNO and 21.2% Na2CO3. Various amounts of water were added to samples of this mixture on a weight percent basis, the water was thoroughly mixed with the sample, and all were dried in a forced air oven at 110°-140° C. After cooling, additional urea was mixed into each sample and the components were ground together in a mortar. The samples were then heated to 150°-160° C and held at that temperature overnight (16-18 hours). The sodium cyanate content was determined, and the results are summarized in the following table.

1. additionwithout continuous mixing of the reactants