Abstract
The rate of absorption of SO 2 by water in short wetted-wall columns (heights of 1 to 5 cm) with no gas phase resistance has been investigated. When the liquid film emerges through a slit of appropriate width, the entrance effect is negligible and need not be considered in applying the penetration theory to the rate of absorption. However, there is a considerable end-effect which is evidenced by a thickening of the film, accompanied by an apparent stagnation of the surface, on the lower one centimetre of the column. The rate of absorption by this part of the film is relatively low. This phenomenon complicates the analysis of data obtained with short wetted-wall columns, or other equipment with films flowing over small distances.
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