The shapes of distribution curves of liquid-liquid equilibrium represented in weight fraction and mole fraction are classified into three types for ternary systems.
As mole fraction is used for concentration variable, there exists a qualitative relation between the shape of curve and liquid-liquid equilibrium ratio. From the equilibrium ratio at about 10 mole% it may be infered the shape of curve for the ternary systems which one of the components is water or all components are organic substances.
For the systems containing water, the solubility characteristic of organic solvents for the same solute corresponds to the shape of distribution curves in some degree. The order of solvent powers agree with the values of equilibrium ratio.
These conclusions hold for the ternary systems which have two pairs of partially miscible components.

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The response rate and the angular characteristics of a cylindrical electrode for measuring liquid velocity is discussed. By the experiment and the dimensional analysis the experimental equation for response rate is obtained. In the both cases of the liquid velocity increase from 0 cm/s to a [cm/s1 and the liquid velocity decrease from u [cm/ s] to 0 cm/s, the response rate is in proportion to d/u (d is probe diameter). In the case of the liquid velocity changes from u₁ [cm/s] to u₂ [cm/s], the response rate is in proportion to d/u₂/u₁² in u₁<u₂, and is in proportion to d/(u₁u₂) ^1/2 in u₁>u₂. As the slowest response rate is obtained in the case of the liquid velocity decrease from a icm/s] to 0 cm/s, this response rate should be considered as the most important factor in using this electrode probe.
And it is become evident after examining the experimental results of the angular characteristics that the direction of the main flow can be determined by rotating this cylindrical electrode in the flow field.

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In this work a method for measuring the agglomeration energy per a constituent particle, E_p, in damp powders have been established by investigating the mechanical relation between shearing work and its shearing resistance in the procedure of shearing test. The effects of packing characteristics of damp powders on E_p were analyzed inductively, and the results obtained were correlated with three main factors such as relative saturation, voidage, and retentiveness of liquid bridges in damp powders. Furthermore, since the effect of the viscosity of liquid binders on E_p could not be negligible according to the increase of shearing rate, such a behavior was explained by introducing a dimensionless group including the factors such as shearing rate, surface tension, viscosity, expansion ratio and so on. It was recognized that the results showed a good agreement with the experimental data.

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Based on the studies of the motions of grinding media and particles in a vibration mill, the results obtained by grinding experiments were discussed. Th e increase of specific surface of particles was closely related to the kinetic energy of vertical motion of media. It was also found that the size distribution of products was related to the ciro ating motion of media which affected particles mot. It was suggested that the result of analysis of the motions of media and particles was connected with l

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A mathematical model of a bag filter with four parameters is formulated theoretically on the basis of some simple postulates. By the use of this model, the pressure drop across the bag filter in a timer type, or the period of dust cleaning in a pressure switch type, is calculated numerically for a wide range of practical conditions. The effects of the dust cleaning residue fraction, the number of compartments, etc. on the results are discussed and it is concluded that the pressure drop in a timer type, or the cleaning period in a pressure type can be obtained easily by use of only one sheet of figures. Further, by taking the above-mentioned conclusion the other way round it is considered that the dust cleaning residue fraction can be estimated easily by measuring the pressure drop, or the cleaning period, which is easy to measure at the outside of a bag filter. It is also considered that with an increase in the number of compartments, the pressure drop in a timer type is decreased and the cleaning period in a pressure switch type is increased, i. e., the life time of a bag may be increased in each case.

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Power requirement has been measured using strain gage for a series of geometrically similar horizontal shaft agitator which is used as gas-liquid contactor and the effects of Reynolds number and Froude number on power number have been investigated.

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In the total recycle urea process, distillation under high pressure and temperature is required for recovering highly concentrated solution. In this case there are two problems: one is urea hydrolysis and the other is control of amount of H₂0 in the overhead gas of the distillation column. About the former, rate of the hydrolysis was measured and it was found that the reaction is second order and the rate constant becomes about twice as the temperature rises by 10°C. A simple equation was derived for estimating degree of hydrolysis within a short time. About the latter, the reduction of amount of H₂0 was achieved by flash of the autoclave effluent at the top of the column and successive distillation. Composition and temperature were constant through the middle stages of the column and the concentration of CO₂ was higher than that at any other part. This phenomenon is due to the reduction of NH₃/CO₂ in the solution by the absorption of CO₂ gas from the bottom, of which partial pressure is relatively higher than that any other part. Therefore more than some stages are not needed. Based on these results a new total recycle urea process was developed.

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