Systems and Methods for Integrated Ammonia-Urea Process
AssigneeKellogg Brown & Root LLC
InventorVishnu D. Singh
Life of this patent
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Abstract
Methods for producing urea are provided. A method for producing urea can include exchanging heat from a syngas comprising hydrogen and carbon dioxide to a urea solution comprising urea and ammonium carbamate. The heat transferred can be sufficient to decompose at least a portion of the ammonium carbamate. In one or more embodiments, the syngas can be reacted with liquid ammonia to provide a carbon dioxide lean syngas and an ammonium carbamate solution. The ammonium carbamate solution can be heated to a temperature of about 180 C or more. At least a portion of the ammonium carbamate in the heated ammonium carbamate solution can be dehydrated to provide the urea solution.
Claims20
1) A method for decomposing ammonium carbamate, comprising:
- exchanging heat from a syngas comprising carbon dioxide to a urea solution comprising urea and ammonium carbamate to produce a cooled syngas and a first urea product, wherein the heat transferred decomposes at least a portion of the ammonium carbamate.
9) A method for decomposing ammonium carbamate, comprising:
- decomposing at least a portion of ammonium carbamate in a first solution comprising urea and ammonium carbamate by transferring heat from a syngas comprising carbon dioxide to the first solution to produce a first urea product and a cooled syngas;
- reacting at least a portion of the carbon dioxide in the cooled syngas with ammonia to produce a syngas having less carbon dioxide than the cooled syngas and a second solution comprising ammonium carbamate and ammonia;
- and
- dehydrating at least a portion of the ammonium carbamate in the second solution to produce the first solution.
16) A method for decomposing ammonium carbamate, comprising:
- reforming a hydrocarbon to produce a syngas comprising carbon dioxide and hydrogen;
- and
- decomposing at least a portion of ammonium carbamate in a first solution comprising urea and ammonium carbamate by transferring a sufficient amount of heat from the syngas to the first solution to produce a cooled syngas and a first urea product.
Dependencies are inferred from the claim text.