IMPROVEMENT OF HIGH PRESSURE CONTOUR FOR UREA SYNTHESIS Russian patent published in 2014 - IPC C07C273/04 

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining urea. Method includes reaction of ammonia and carbon dioxide in high pressure contour (1), which includes at least synthesis reactor (2, 200), section (3) of thermal steaming and section (4) of carbamate condensation. Urea solution (9), obtained in interaction of ammonia and carbon dioxide, is subjected to adiabatic steaming in section (10) of adiabatic steaming with supply (11) of carbon dioxide as means for steaming, with obtaining liquid urea solution (12) and vapour phase (13), which contains ammonia and carbon dioxide. Urea solution (12), obtained in the process of adiabatic steaming, is additionally subjected to thermal steaming in section (3) of thermal steaming and is returned to vapour phase (13) in reaction zone in synthesis reactor for recycling. Section of thermal steaming includes device for self-steaming without addition of some means for steaming or includes device for steaming with carbon dioxide, in which as means for steaming applied is carbon dioxide, and line (5) for carbon dioxide supply is divided into first section (11), directed into section (10) of adiabatic steaming, second section (8), directed into reactor (2), and third section (16), directed into section (3) of thermal steaming; on first section (11) supplied is amount o carbon dioxide, constituting 20-60% of total initial quantity. Also claimed are installation for urea obtaining and method of its modernisation.

EFFECT: invention makes it possible to increase reaction output, ensure higher productive capacity and reduce energy consumption.

9 cl, 4 dwg