METHOD OF FORMING UREA BY INTEGRATION OF AN AMMONIA PRODUCTION PROCESS IN A UREA PRODUCTION PROCESS AND A SYSTEM THEREFOR
First Claim
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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 a 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, andtransporting the lean solvent stream from the urea production process to the absorber.
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Abstract
A method of forming urea by integration of an ammonia production process with that of a urea production process, as well as a system for the method is disclosed. Also, an alternative method of forming urea by integration of a part of an ammonia production process with that of a urea production process, as well as a system for the alternative method.
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Citations
20 Claims
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1. A method of forming urea by integration of an ammonia production process in a urea production process comprising:
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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 a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of forming urea by integration of a part of an ammonia production process in a urea production process, comprising:
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obtaining a hydrogen/carbon dioxide stream from an ammonia production process, and a flue gas stream containing carbon dioxide and nitrogen, transporting the flue gas stream to a low pressure absorber; contacting the flue gas stream with a lean solvent stream in the low pressure absorber to produce a semi-rich solvent stream and a cleaned gas stream containing nitrogen; transporting the hydrogen/carbon dioxide stream to a high pressure absorber; transporting the semi-rich solvent stream from the low pressure absorber to the high pressure absorber; contacting the hydrogen/carbon dioxide stream with the semi-rich solvent stream in the high pressure absorber to form a rich solvent stream and a hydrogen stream; transporting the rich solvent stream from the high pressure absorber to the urea production process to form urea and a lean solvent stream comprising a solution of carbamate, ammonia, carbon dioxide and water, transporting the lean solvent stream to the low pressure absorber, and transporting a stream from an ammonia production unit to the urea production process. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification