WAY OF CARBAMIDE PRODUCTION Russian patent published in 2012 - IPC C07C273/04 C07C275/00 

FIELD: chemistry.

SUBSTANCE: invention refers to the way of carbamide production at higher temperatures and under the pressure in the installation that contains a high pressure section including a reactor, stripper, condenser and gas washer. The method includes interaction between ammonia and carbon dioxide in the reactor with formation of the reactor feed and separate withdrawal of the liquid flow containing carbamide, ammonium carbamate and free ammonia in water solution from the reactor, and the gas flow containing predominantly inert gases. The flows of liquid and gas carbon dioxide are fed to the high pressure section. The liquid flow from the reactor is for to the stripper for partial decompounding of the ammonium cabamade and partial release of the free ammonia in the current of the gas carbon dioxide that is introduced into the stripper and includes ammonia and carbon dioxide admixed with water vapour, and of the liquid flow including carbamide and residual ammonium carbamade in the water and ammonia solution. The liquid flow from the stripper is fed at the stage of subsequent decompounding of the ammonium carbamade and separation of ammonia and carbon dioxide thus obtaining carbamide and recirculating liquid flow containing ammonium carbamade in the water and ammonia solution. The gas flow from the stripper is fed to the condenser for partial absorption and condensation in the course of mixing with ammonia and the liquid flow from the gas washer. The liquid flow from the condenser is fed to the reactor. The gas flow from the reactor is cleaned from ammonia and carbon dioxide while contacting with the recirculating liquid flow in the gas washer. The flow of liquid carbon dioxide is introduced into the reactor or condenser after it has been mixed with another process flow; the flow of liquid carbon dioxide is mixed with the liquid flow coming out from the gas washer or the condenser.

EFFECT: improvement of reliability of the applied equipment.

4 cl, 3 dwg, 3 ex