機械的攪拌による液-液分散(第3報)分散過程に及ぼす乳化剤の影響

抄録

This paper deals with effect of impeller velocity and emulsifying agent concentration on dispersion process. The apparatus consists of a cylindrical vessel (dt=150 mm) made of clear acrylate resin and Rushton-type impeller (di=49 mm). Water and a mixture of n-C₇H₁₆ and CCl₄ were used as the continuous phase and the dispersed phase. Tween-20 and Tween-81 were employed as the emulsifying agent, and their concentration was 1%, 10^-2%, 10^-3% and 10^-4%. Agitation was continuously done for 60 min, and revolution of the agitator was 330, 400, 530, or 660 rpm. The photographs of droplets were taken by a microscopic method, and the particle size distribution was calculated. The results obtained were as follows. 1) The normalized standard deviation was smaller with increasing concentration of the emulsifying agent, and the droplet size became uniform. 2) Irrespective of the concentration of emulsifying agent, surface energy Es had a constant value. 3) Experimental equation relative to the mean surface-volume diameter, d₃₂, surface tension γ, revolution number N, and agitation time θ wa as follows : [numerical formula]