In the previous paper³⁾, it was reported that the rate of mass transfer between drops of organic solvents and water was reduced by the addition of some substances. In the present work, a study on the rate of extraction from drops of organic solvents to drops in pure systems has been made paying special attention to these poisonous substances. For butylacetate, -IPE-and MIBK-water systems which are not liable to be contaminated easily, results agreed approximately with the published data (Table 2), but the observed K_d values were much larger than the published data for the benzene-water system (Table1). This discrepancy between the author's and the published data cannot be accounted for by any experimental errors. It seems likely that it is due to difference in purity of the benzenes, solutes and waters used and to the resultant contamination by trace quantities of poisonous substances.
The observed K_d values were largest at the beginning of free rise, and they decreased when the height of rise increased due to the transfer of acetic acid or propionic acid whose distribution favors water.
The observed K_d values for 24 systems (3 solutes and 8 solvents) were compared with the predicted K_d volues which were calculated by Eq. (3) for k_d and k_e (Fig. 8). The over-all mass transfer coefficients for non-contaminated systems can be approximately predicted by Eq. (3), but further studies with due attention to poisovous substances will have to be carried out to obtain more accurate correlations.

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Taking into consideration the temperature gradient within the solid particles, new solutions were given by way of differential equations describing unsteady state heat transfer in the stationary beds of granular solid particles, and these were compared with the results of the experiments performed at the N^u number, (D_ph/λ)=0.2-2.0.
The final differential equations obtained are as follows.
Eq.(12):
Eq.(25):
These equations were solved numerically under the boundary condition shown in Eq. (13) and (26').
The results are shown in Fig. 2, 3 and 4.
These are easy in practical applications and agree satisfactorily with the experimental data as shown in Figs. 7 and 8.

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The discharge coefficient of small holes drilled through a rotating cylinder wall were studied theoretically, as a fundamental study of the centrifugal gas-liquid or liquid-liquid contactor (fractionator, absorber, and extractor etc.).
The results are as follows :
(1) The discharge coefficient of a small hole drilled through a rotating cylinder wall is defined by the following equation,
(2) When the surface tension is taken into account, the discharge coefficient, Cσ in the following equation should be introduced.
(3) For the various practical cases mentioned below the following equations will hold.
(a) When in perfect orifice state:
(b) When in quasi-orifice state:
(c) When liquid stream flows between a and c indicated in Fig. 5, and when a capillary action is observed along the hole wall:
(d) When in nozzle state (assumingθ-β=60°):
(4) The effect of surface tension on the coefficient is negligible when the value of Weber number is larger than 1000.

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The discharge coefficient of small holes drilled through a rotating cylinder wall were studied experimentally, as a fundamental study of the centrifugal gas-liquid or liquid-liquid centactor.
The results are as follows:
(1) It is confirmed experimentally that the discharge pressure of liquid under the contrifugal force is represented by Eq.(1), and the discharge coefficient, by Eq. (2).
(2) The discharge coefficient depends upon the diameter of hole, the thickness of the wall and Red, but as far as the discharge coefficient defined by Eq. (2) is concerned, no difference is recognized whether it is in the centrifugal field or in the gravitational field.
(3) The effect of liquid viscosity on the discharge coefficient is covered by Red.
(4) All the experimental results obtained of the effect of liquid surface tension agree with the results of the theoretical consideration introduced in the previous paper, as shown in Fig. 15. Taking into account the surface tension, the discharge coefficient is presented by Eq. (5): and the effect of surface tension is considered negligible when the Weber number is greater than 1, 000.

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Specific gravity, viscosity and surface tension of methanol-water solutions at various temperatures were measured up to the boiling point and arep resented in Tables. The refractive index of the same solutions at 30°C is also given.
In measuring specific gravity, the pycnometer method was used with due corrections for higher temperatures. Viscosity was measured using the Ostwald viscometer and the surface tension by the capillary rise method, both with due precautions necessary for higher temperatures. The refractive index was obtained using a dipping refractometer equipped with a sodium lamp and a thermostat.

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