A laboratory study was conducted to determine the factors influencing the dispersion of oil with a turbine mixer. Drop-size distributions as a function of time were related to the impeller diameter, power expended in relation to the liquid volume, and the final emulsion temperature.It was surprising that higher temperatures produced smaller mean drop diameters but at the expense of a wider distribution. An optimal batch size for the emulsion was found to exist in processing. Below this size, tank surface and internal turbulence waste much of the energy; above this size, the energy per unit volume became a critical factor.Other trials were made to determine the effect of the turbulence of the tank surface, tank geometry, number of impeller blades, and turbine configuration. These all significantly affect drop size and should be considered in the design and selection of dispersing equipment. R. R. ROUNSLEY Mead Corp.Chillicothe, OH 45601 SCOPEThe emulsification of oil with a turbine mixer in a baffled cylindrical tank was correlated for the Sauter mean diameter as a function of time. Several time relationships are considered which describe the resulting mean drop diameter. The ultimate diameter that can be reached at infinite dispersion time is correlated to the operating conditions.A size distribution computer program is described and applied to the measured emulsification data. Mean diameters in the range of 1 to 30 pm were evaluated. An analysis is made of the emulsion size distributions for the emulsions and the conditions which formed them.Several different types and sizes of impellers were employed and these are evaluated on their ability to produce a desired size distribution rapidly. Different emulsion levels in the tank are related to the effective use of agitator power.

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