From Calcium Cyanamide and Ammonium Nitrate

GUANIDINE NITRATE FROM CALCIUM CYANAMIDE AND AMMONIUM NITRATE 

Submitted by Mabvin T. Schmidt and L. F. Audrieth Checked by L. P. FuLLERf and G. B. L. Smith  

According to Goekel,22 this reaction takes place in the following manner Dry ammonium nitrate reacts with calcium hydroxide present in the crude calcium cyanamide to give calcium nitrate, water, and ammonia. The ammonia and water do not escape but are absorbed by the calcium nitrate to give a mixture of hydrated and ammonated salt and also by the ammonium nitrate which is ammono-deliquescent (Diver s solution). These substances melt below 100°C. and provide a solvent in which the reaction between calcium cyanamide and ammonium nitrate may take place. 

Six hundred grams of crude calcium cyanamide is mixed with 1500 g. of ammonium nitrate in a 4-1. flask and heated on a steam bath. After about 6 hours of heating, the mixture becomes thick and pasty and eventually assumes the consistency of a viscous fluid. When the mass has reached the latter stage, samples are withdrawn every half hour, diluted and filtered, and tested for cyanamide with a 

10 per cent ammoniacal silver nitrate solution. When the yellow precipitate of silver cyanamide is no longer obtained, indicative of the fact that the reaction is complete, the flask is removed from the steam bath, and 2500 ml. of hot water is added to the mixture. A large amount of ammonia is evolved. 

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B. GUANIDINE NITRATE FROM CALCIUM CYANAMIDE AND AMMONIUM NITRATE... 

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