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KMID : 0370219630070020067
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Yakhak Hoeji
1963 Volume.7 No. 2 p.67 ~ p.71
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Preparation of Sodiumisocyanate and its Analyzing Method in the Presence of Impurities Na₂CO₃, Urea, and Biuret
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Abstract
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Studied the reaction mechanism and optimal reaction condition of the process ef preparing sodium isocyanate, by mesns 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 Na_(2)CO_(3), 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, Na_(2)CO_(3), urea and biuret could be done by the following mothod:-adding nitrobarite solutien into sample solution in order to remove CO_(3)" and neotralize the solution, filtering off BaCO_(3), and then precipitating isocyanate as a silver salt, filtering off AgNCO, and then, titrating remaining AgNO_(3) with NH_(4)SCN, (indicator FeNH_(4)(SO_(4))_(2))
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KEYWORD
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