C - Chemistry – Metallurgy – 01 – C
Patent
C - Chemistry, Metallurgy
01
C
23/351
C01C 1/02 (2006.01) B01D 19/00 (2006.01) B01D 53/14 (2006.01) C01B 31/20 (2006.01) C01C 1/12 (2006.01)
Patent
CA 1123176
Abstract A process for the separation of substantially pure NH3 and substantially pure CO2 from a mixture containing NH3, CO2 and water is disclosed. In this process NH3 is separated by rectification in an NH3-separation zone, the remaining liquid phase is fed to a CO2-separation zone where gaseous CO2 is separated by rectification, and the resulting liquid phase is fed from the bottom of this zone to a desorption zone, where virtually all NH3 and Co2 still contained in this liquid phase are separated as a gaseous mixture. To improve the efficiency of the separation and to decrease the sensitivity of the process to fluctuations in the feed to the NH3-separation zone the process is characterized in that so much gaseous CO2 or a gaseous mixture containing CO2 is fed to the bottom of the NH3- separation zone that the composition of the liquid phase released in the bottom of the NH3-separation zone is not on the side of the boundary line rich in NH3. Preferably also an amount of inert gas is intro- duced together with the CO2.
349921
Fetherstonhaugh & Co.
Stamicarbon B.v.
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