Abstract

An experiments on the absorption of pure carbon dioxide by water containing a wetting agent (Emerl), was conducted in a 7.0cm dia. column packed with 15mm Raschig rings.The results obtained are shown in Fig. 1, as a plot of kLa vs. L on a logarithmic scale. The effect of wetting agent on the absorption rates can be observed in this figure and more clearly in Fig. 2, where kLa at a constant value of L (15, 000kg/m2·hr) is plotted against the concentration of the againt. With the increase in the concentration, kLa decreases until it reaches the minimum at a certain concentration, and then it begins to increase. These results are similar to those obtained by Rennolds7) on the desorption of carbon dioxide, which was carried out using 1/2in. carbon Raschig rings as packings.Variation of kLa with the change in the concentration of the agents may perhaps be due to the fact that the two effects are contradictory to each other. With the increase in the concentration of the agent. liquid phase mass transfer coefficient, kL, decreases, but the effective interfacial area, a, increases, -the former probably because of the incomplete mixing of liquid at the juncture points of packing pieces, 6) and the latter because of the decrease in surface tension.4)Based on this idea, the effect of surface tension on the effective interfacial area has been determined for the case where 15mm Raschig rings are used. which shows good agreement with the results reported in the previous paper.4)

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