In the course of their studies on the characteristics of various types of jet pumps, the authors experimented on the application of these jet pumps, as a test of continuous operation, to such chemical processes as the extraction and neutralization of penicillin, the separation of insoluble impurities from sodium alginate solution, the production of Mg(OH)2 from sea-water, the pneumatic conveyance of coal powder, etc, many of which proved successful and have been developed into industrial scale.
As the jet pump is known to suit remarkably the purpose of instantaneous mixing of fluids and easy controlling of their flow rate ratio, as well as keeping their condition stable and steady, there will be still many more fields to which it will be advantageously applied.

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Such a reactor model as fulfils the eq. (2) -i.e. mean diffusivity and velocity are able to be assumed is proposed and the residence time curves of the model are mathematically solved as eq. (7)-(8)'.
Based on them, we discussed various behaviours of such a reactor model.
From comparisons between the model and the measurements performed by Gilliland et. al.^{4), 5), 6)} mainly on the fluidized bed, we have concluded that the model is able to give fairly good representation to the experimental results.
Based on such a quantity as U, we have discussed the characteristics on the concentration driving force of various flow reactors and concluded that the term U seems to be a representative quantity of such characteristics.

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In a column-type reactor agitated with multi-stage paddles, the state of mixing and the appearance of flowing of liquid were observed with the aid of dye solution injected in it. By this experiment, it was found that the liquid is mixed in such a way as to show a distinct concentration difference in each agitator region and at the same time uniform mixing throughout the reactor. From this observation, the authors assumed for convenience' sake that a part of the liquid (φ) in the reactor flows in piston-type movement while the rest (1-φ) in perfect mixing; hence was derived an equation to relate the fraction of piston-type flow (φ) to the conversion (z) in the first order reaction as follows:
Secondly, the empirical equation to estimate the fraction of piston-type flow (φ) was derived when the height-to-diameter ratio of the reactor (H/D), the rotational speed of the agitator (N) and the nominal holding time (θ) were varied.
Good agreement was proved by comparing the values z_cals calculated by the above equation, with the values z_ex, observed in our experiments on the hydrolysis of acetic anhydride.

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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