Process for distilling ammoniacal solutions
AssigneeMontedison S.p.A.
InventorsGiorgio Pagani, Fabrizio Socci
Life of this patent
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Abstract
A process for distilling ammoniacal solutions is disclosed comprising the utilization of two distillation columns operating at different pressures, the ammoniacal solution to be distilled being sent--after being mixed with the ammoniacal vapors flowing from the top of the column operating at the lower pressure--to the column operating at the higher pressure, from the bottom of which the partially distilled ammoniacal solution is sent to the column operating at the lower pressure; the liquid ammonia being recovered at the top of the column operating at the higher pressure while the residual ammoniacal solution is withdrawn from the bottom of the column operating at the lower pressure.
Claims6
A process for distilling ammoniacal solutions, comprising, providing a first column of a first design and a second column of a second design, each operating at different pressures, the ammoniacal solution to be distilled being sent, after being mixed with the ammoniacal vapors flowing from the top of the first column operating at the lower pressure, to the second column operating at the higher pressure, from the bottom of which the partially-distilled ammoniacal solution is conveyed to the first column operating at the lower pressure;
- liquid ammonia being recovered at the top of the second column operating at the higher pressure, while the residual ammoniacal solution is withdrawn from the bottom of the first column operating at the lower pressure;
- said first and second designs co-acting to enable operation of said process at or below thermal levels of 140.degree. C.
Dependencies are inferred from the claim text.