Absorption Column.docx - Absorption Column The quenched...

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Absorption Column The quenched effluent gasses that has been cooled and removed of its excess ammonia would then be piped to an absorption column. In the absorber, the effluent gasses are contacted with water in counter-current flow for the absorption of substantially all of the acrylonitrile and hydrogen cyanide into the aqueous stream and removing the unwanted gaseous byproducts [1]. As this process involves the absorption of a gaseous stream in contact with water, some common gas-liquid contactors such as the falling-film column, spray column, bubble column, packed column, and plate columns. The first column that would be examined is the falling film column and this was found to be ineffective as they have low contact time which minimizes the absorption efficiency of acrylonitrile in water [2]. Besides, its low liquid retention is not appropriate in the context for acrylonitrile recovery as the intention is to retain the aqueous stream [2]. Spray columns are typically used in removal of dust particles in the purification of gases [3]. Spray columns also have poor mass transfer which restricts them to particulate matter removal [4] so it would be inefficient in recovering acrylonitrile.
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