Process for preparing calcium cyanamide from urea

Details Process for preparing calcium cyanamide from urea Process for preparing calcium cyanamide from urea

C - Chemistry, Metallurgy

01

C

C01C 3/18 (2006.01)

Patent

CA 2185233

In order to produce calcium cyanamide by reacting urea with an oxygen-containing calcium compound in at least two steps a) in a first step the reaction components are allowed to react under compression and/or while being revolved or by applying them to a hot surface at temperatures of 120 to 500°C until a solid is formed and b) the solid reaction mixture that is formed is subsequently calcined at temperatures of 600 to 900°C. In this process it is possible to obtain high yields and throughputs of calcium cyanamide without requiring a time-consuming processing of the reaction product after the first or second step.

L'invention concerne un procédé de préparation de cyanamide de calcium, par réaction d'urée avec un composé calcium contenant de l'oxygène, qui comprend au moins deux étapes: a) dans une première étape, on fait réagir les constituants en les condensant et/ou en les faisant circuler ou en les appliquant sur une surface très chaude à des températures comprises entre 120 et 500 DEG C, jusqu'à ce qu'ils deviennent solides, et b) le mélange de réaction solide obtenu est calciné à des températures comprises entre 600 et 900 DEG C. Ce procédé permet d'obtenir des rendements et des quantités élevés de cyanamide de calcium, sans impliquer de retraitement complexe du produit de réaction après la première ou la seconde étape.

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