Isolation of pure ammonia from gas mixtures containing ammonia a

Details Isolation of pure ammonia from gas mixtures containing ammonia a Isolation of pure ammonia from gas mixtures containing ammonia a

1977-10-12

1978-10-17

Wyse, Thomas G.

Gas separation

Means within gas stream for conducting concentrate to collector

55 56, 55 68, 55 70, 55 89, 55 93, B01D 5314

Patent

active

041206673

ABSTRACT:
To isolate ammonia from gas mixtures containing ammonia and carbon dioxide, the gas mixture is first partially absorbed in a solvent, with residence times of at most 0.1 second, and the non-absorbed gas is then separated from the solution obtained. The solution is then subjected to a first desorption stage, in which only the ammonia present in an excess over a molar ratio of 3 parts of ammonia to 1 part of carbon dioxide is expelled by heating, and the entrained carbon dioxide is washed out of the expelled ammonia by means of solutions containing free ammonia. The solution remaining after the first desorption stage is substantially freed from ammonia and carbon dioxide in a second desorption stage and the expelled gas, containing solvent, together with fresh gas mixture is fed to the adsorption stage, while the solvent obtained from the second desorption stage is employed for the absorption.

REFERENCES:
patent: 2808125 (1957-10-01), Buck et al.
patent: 2812829 (1957-11-01), Marullo et al.
patent: 3038285 (1962-06-01), Mavrovic
patent: 3315442 (1967-04-01), Yuan et al.
patent: 3691729 (1972-09-01), De Rooy et al.
patent: 4013431 (1977-03-01), Berkel et al.

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