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A neutral aqueous solution of cyanamide, or a solution made very slightly alkaline with ammonia, is evaporated a t reduced pressure to a concentration of a t least 20 per cent cyanamide. While the solution is still hot (70" C. or there-about), ammonia, either gaseous or in the form of aqua am-monia, is added in quantity sufficient to bring its concentra-tion within the range of 2.0 to 4.5 per cent. ·¢×ÔСľ³æAndroid¿Í»§¶Ë |
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