METHOD OF PRODUCING UREA BY COMBINING AMMONIA PRODUCTION PROCESS AND UREA PRODUCTION PROCESS AND SYSTEM THEREFOR Russian patent published in 2015 - IPC C07C273/04 

FIELD: chemistry.

SUBSTANCE: method includes producing ammonia and carbon dioxide and furnace gas for a first ammonia stream, a carbon dioxide stream and a furnace gas stream containing carbon dioxide; dividing the first ammonia stream into a second ammonia stream and a third ammonia stream, wherein the second ammonia stream is transferred to an absorber, and the third ammonia stream is transferred to the urea synthesis section of the urea production process; transferring the carbon dioxide stream to the urea synthesis section; transferring the furnace gas stream to the absorber; combining the second ammonia stream and an impoverished solvent stream coming from the urea production process to form a mixed stream; bringing the mixed stream into contact with the furnace gas stream in the absorber for absorbing carbon dioxide from the furnace gas stream to form an enriched solvent stream and a treated gas stream; transferring the enriched solvent stream released from the absorber to the urea synthesis section; bringing into contact the carbon dioxide stream, the third ammonia stream and the enriched solvent stream in the urea synthesis section to form urea and an impoverished solvent stream and transferring the impoverished solvent stream from the urea production process to the absorber. The invention also provides a method of producing urea by combining part of an ammonia process and a urea production process, and a system for carrying out said methods.

EFFECT: invention reduces power consumption and capita costs.

29 cl, 3 dwg