Sodium Isocyanate의 제법 및 Na2CO3, Urea, Biuret 혼재시 그의 정량분석법에 관한 연구

Preparation of Sodiumisocyanate and its Analyzing Method in the Presence of Impurities Na2CO3, Urea, and Biuret

Studied the reaction mechanism and optimal reaction condition of the process of preparing sodium isocyanate, by means of heating reaction of sodium carbonate and urea. Proposing, at the sametime, the quantitative analyzing method of sodium isocyanate in the presence of impurities of Na2CO3, urea and biuret. 1. Sodium isocyanate could be prepared by means of heating reaction of sodium carbonate and urea. 2. Adding urea into the heated sodium carbonate is reasonable. 3. Quantitative analysis of sodium isocyanate in the presence of impurities, Na2CO3, urea and biuret could be done by the following method:-adding nitrobarite solution into sample solution in order to remove CO3" and neutralize the solution, filtering off BaCO3, and then precipitating isocyanate as a silver salt, filtering off AgNCO, and then, titrating remaining AgNO3 with NH4SCN, (indicator FeNH4(SO4)2)