Ammonia synthesis

Details Ammonia synthesis Ammonia synthesis

C - Chemistry, Metallurgy

01

C

23/217

C01C 1/04 (2006.01) C01B 3/00 (2006.01)

Patent

CA 1038598

AMMONIA SYNTHESIS ABSTRACT OF THE DISCLOSURE An improved ammonia synthesis train utilizing hydrocarbon starting materials which are converted to hydrogen under superatmospheric pressure in a series of steps which include conversion of the hydrocarbons to hydrogen-carbon monoxide mixtures, shift conversion of the carbon monoxide to hydrogen and CO2, and removal of the CO2. In such a system, reduction in process gas losses is achieved through an improved arrange- ment and integration of the shift conversion and CO2 removal steps. The carbon monoxide is first shifted in a series of shifts including a final low temperature shift; the bulk of the CO2 is removed by an essentially isothermal hot potassium carbonate CO2 removal system; the small residual amount of carbon monoxide is shifted to very low levels in a final low temperature shift; and the small amount of residual CO2 is then removed to very low levels in a second non-isothermal scrubbing system employing an aqueous solution of a chemical absorbent. Methanation, compression and ammonia synthesis follows. Losses of process gas in the methanation step and in the purge gas from the ammonia loop are sharply reduced with concomitant high thermal efficiency.

238578

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