Chemistry of inorganic compounds – Nitrogen or compound thereof – Ammonia or ammonium hydroxide
Reexamination Certificate
2001-10-24
2008-12-30
Langel, Wayne (Department: 1793)
Chemistry of inorganic compounds
Nitrogen or compound thereof
Ammonia or ammonium hydroxide
C564S069000
Reexamination Certificate
active
07470415
ABSTRACT:
A method for producing ammonia from natural gas, fed to an autothermic reformer with an O2rich gas. Crude synthesis gas is produced at temperatures of 900 to 1200° C., pressures of 40 to 100 bar and in the presence of a cracking catalyst. The crude synthesis gas is led through a catalytic conversion system to convert CO to H2, thereby obtaining a conversion synthesis gas with a H2content of at least 55 vol.-% and a CO content of not more than 8 vol.-%. The conversion synthesis gas is subjected to a gas purification to remove CO2, CO and CH4, thereby producing an N2—H2mixture that is subjected to a catalytic ammonia synthesis. The ammonia produced can at least be partially converted to urea by reacting it with CO2.
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Davey William
Filippi Ermanno
Ammonia Casale S.A.
Langel Wayne
Lurgi GmbH
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