| 摘要 |
<p>In a process for the production of guanidine nitrate from a mixture of urea and ammonium nitrate in the presence of a catalyst containing silicium oxide at increased temperature, the initial mixture of urea and ammonium nitrate having an excess of ammonium nitrate, urea is added stepwise to the existing mixture of urea and ammonium nitrate and the catalyst during the procedure in quantities so that the weight ratio of urea: ammonium nitrate is permanently in favor of an excess of ammonium nitrate. The weight ratio is practically maintained during the process and is increased only in the final phase. An apparatus for the performance of the process of the invention comprises a reactor system including one or several substantially horizontal, tubular, heatable reactors in a series. The reaction mass is introduced together with the catalyst in the form of a melt and moved through the reactor system by means of a stirrer and a conveyor. At one or several places before the outlet of the reactor system inlet nozzles are provided in certain distances from one to the other through which urea and catalyst may be added to the melt. For a continuous performance for the process the reaction mass is brought onto heatable conveyor belts in a series as a layer of the desired thickness. Along the belt the required additives are added to the reaction mass. The rate of the conveyor belts depends on the reaction rate.</p> |
