| 摘要 |
PROBLEM TO BE SOLVED: To obtain a method for producing an alkali metal cyanate, more industrially advantageous than conventional methods for producing an alkali metal cyanate using a melt solid phase reaction method, providing the alkali metal cyanate in a suitable state as a raw material for producing a cyanuric acid derivative excellent in purity and preventing formation of ammonium carbonate from ammonium and carbon dioxide produced as by-products. SOLUTION: In a method for producing an alkali metal cyanate by reacting an alkali metal carbonate with urea in a reaction solvent under heating conditions, the whole or the reside after partial condensation of a reaction solvent vapor accompanying ammonium and a carbon dioxide gas as by-products and discharged from a reactor is brought into contact with formalin ammonium is recovered as an aqueous solution of hexamethylenetetramine and the reaction solvent trapped in the aqueous solution is recovered and circulated to the reactor.
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