C - Chemistry – Metallurgy – 01 – C
Patent
C - Chemistry, Metallurgy
01
C
23/217
C01C 1/04 (2006.01) C01B 3/02 (2006.01)
Patent
CA 1152727
ABSTRACT OF THE DISCLOSURE Described herein is a process to produce ammonia from hydrocarbon feedstock, involving basically the steps of dividing the feedstock into two fractions; subjecting the first fraction to a primary steam reforming reaction, at high pressure and moderate temperature; combining the effluent from the primary reforming with the second fraction of the feedstock, and subjecting the mixture thereof to a secondary adiabatic reforming reaction with an amount of air in excess of that needed for ammonia synthesis; subjecting the synthesis gas produced to a CO shift conver- sion reaction, and then to CO2 removal by solvent scrubbing, the gas released by pressure letdown of said solvent being preferably recycled back upstream of the secondary re- forming; -methanating the residual carbon oxides; -removing the excess nitrogen contained in the synthesis gas by cryogenic separation; -compressing and feeding the final synthesis gas into an ammonia synthesis loop; and -recycling the purge gas from said ammonia synthesis loop to upstream of the cryogenic separation. This process achieves a substantial saving in energy as compared to conventional processes for preparing ammonia synthesis gas.
366828
Foster Wheeler Energy Corporation
Gowling Lafleur Henderson Llp
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