Ammonia synthesis

Details Ammonia synthesis Ammonia synthesis

1974-05-29

1976-03-30

Vertiz, Oscar R.

Chemistry of inorganic compounds

Nitrogen or compound thereof

Ammonia or ammonium hydroxide

423228, 423652, 23260, C01C 104

Patent

active

039475514

ABSTRACT:
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 CO.sub.2, and removal of the CO.sub.2. In such a system, reduction in process gas losses is achieved through an improved arrangement and integration of the shift conversion and CO.sub.2 removal steps. The carbon monoxide is first shifted in a series of shifts including a final low temperature shift; the bulk of the CO.sub.2 is removed by an essentially isothermal hot potassium carbonate CO.sub.2 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 CO.sub.2 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.

REFERENCES:
patent: 2487981 (1949-11-01), Reed
patent: 3382045 (1968-05-01), Habermehl et al.
patent: 3577221 (1971-05-01), Smith et al.
Trans. Instr. Chem. Engrs., Correlation of Abs. Rates of CO.sub.2 by Alkaline & Amine Solutions in Packed Columns, Vol. 38, 1960, pp. 216-224.

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