| 摘要 |
A process for the production of ammonia, comprising the steps of: (a) gasifying a feedstock containing carbon and a source of hydrogen with air as the only source of free oxygen, to produce a raw synthesis gas comprising nitrogen, hydrogen, carbon oxides, and methane; (b) subjecting the raw synthesis gas to a shift conversion reaction; (c) removing the carbon oxides from the shift converted raw synthesis gas to produce a purified synthesis gas; (d) mixing the purified synthesis gas with a hydrogen-rich gas to form a final synthesis gas; (e) injecting the final synthesis gas into an ammonia synthesis loop to produce ammonia and a purge gas; (f) separating the purge gas cryogenically, to produce a methane-rich gas, a nitrogen-rich gas, and the hydrogen-rich gas; and (g) recycling the hydrogen-rich gas to step (d). The methane-rich stream is at least partially recycled to step (a). Sulfur compounds, if necessary, may be removed from the raw synthesis gas.
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