Patent ID: 9428449
Filing Date: 2016-08-30
CPC Classification: C01C,C07C,Y02P

Claim Text:
1. A method of forming urea by integration of an ammonia production process in a urea production process comprising: obtaining ammonia and carbon dioxide and a flue gas for a first ammonia stream, a carbon dioxide stream, and a flue gas stream containing carbon dioxide; separating the first ammonia stream into a second ammonia stream and a third ammonia stream, wherein the second ammonia stream is transported to an absorber and the third ammonia stream is transported to a urea synthesis section of the urea production process for the production of urea; transporting the carbon dioxide stream to the urea synthesis section; transporting the flue gas stream to the absorber; combining the second ammonia stream and a lean solvent stream provided from the urea production process to form a mixed stream; contacting the mixed stream with the flue gas stream in the absorber to absorb carbon dioxide from the flue gas stream to form a rich solvent stream and a treated gas stream; transporting the rich solvent stream emitted from the absorber to the urea synthesis section; contacting the carbon dioxide stream, the third ammonia stream and the rich solvent stream in the urea synthesis section to form urea and the lean solvent stream; and transporting the lean solvent stream from the urea production process to the absorber.