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This invention describes a process of producing urea with a low water content directly at synthesis conditions. This means no recirculation and evaporation stages are needed and directly a urea melt suitable for melamine or guanamines is obtained. The invention claims this can be realized by maintaining the partial vapor pressure of water low enough that water remains in the vapor phase.
The minimum required pressure would be 1000 PSI (about 69 bars) , preferably pressure and temperature are 2000 PSI (about 138 bars) and 200 degC. The diluting gas can be ammonia, carbon dioxide or any other gas.


 

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Download this file (1950 Mackay 2527315 Urea Process.pdf)1950 Mackay 2527315 Urea Process.pdf[ ]188 kB