Integrated production of ammonia and urea

Details Integrated production of ammonia and urea Integrated production of ammonia and urea

1985-01-18

1987-09-01

Doll, John

Chemistry of inorganic compounds

Nitrogen or compound thereof

Ammonia or ammonium hydroxide

564 69, C01C 104

Patent

active

046908129

ABSTRACT:
The combined production of ammonia and urea by the reaction of gases containing hydrocarbons with steam is conducted by using a steam reformer, downstream secondary reformer, and shift converter. The ammonia synthesis gas (hydrogen, nitrogen and carbon dioxide) is subjected to a high pressure scrubbing step with a physical solvent, to remove the acid impurities, especially CO.sub.2. The pressure on the loaded solvent is reduced to a first intermediate pressure for degasing of the coabsorbed inerts and then to a second intermediate pressure for removal of the bulk of the absorbed CO.sub.2, which is then used for urea synthesis. To remove residual CO.sub.2, the solvent is stripped with air and the resultant air stream containing the stripped residual CO.sub.2 is fed to the secondary reformer.

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Strelzoff, Technology and Manufacture of Ammonia, John Wiley & Sons (1981), pp. 251-254.

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