空気・水・油系における酸素の分配平衡とその移動について

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As part of the basic research on oxygen transfer into the heterogeneous liquid phase of a water-oil system, the equilibrium distribution of oxygen in the water and n-paraffin phases were measured under isothermal conditions of 25°, 30°, 35°, and 40℃. From the above investigations, it was clear that oxygen is 7〜9 times more soluble in n-paraffin than in water. The effect of temperature on the equilibrium distribution of oxygen was expressed by the following equation with errors less than ±5%.[numerical formula]0.9×10<-4>≦C_0≦8×10<-4>The oxygen transfer rates into the heterogeneous liquid phase were obtained from a measurement of the pressure change accompanying the oxygen absorption in a closed agitated vessel with a draft-tube. The operating conditions of these experiments were as follws : volume fraction of n-paraffin φ=0〜0.1,linear velocity of aeration V_S=0.2〜0.8cm/sec, rotation speed of impeller N=4〜9.5 rps, and t=30℃. The volumetric oxygen transfer coefficients for the water film surrounding the gas bubbles, (k_La)_0,and for the water film surrounding the oil droplets, (k_La)_0,were calculated using the results of the measurements from the material balance differential equations derived according to the following assumptions : the pathway of oxygen transfer is air → water → oil and the change in the oxygen concentration of the oil droplets is in a pseudosteady state. It was found that both the volumetric absorption coefficients increased with an increase in the oil volume fraction. These values and the operation variables were correlated with each other by the following equations with errors less than ±15%.[numerical formula][numerical formula]
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空気・水・油系における酸素の分配平衡とその移動について

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