In order to study the dependence of liquid phase capacity coefficient in a packed tower on the physical properties of the absorption system, experiments were conducted on the purely physical absorption of carbon-dioxide by various solvents. As the solvents, ethyl-alcohol, methyl-alcohol, water, benzene, decalin and carbon-tetrachloride were used.
With all the solvents, the kLa vs. L curves had a critical point where the dependence of kLa on L showed a sudden change. The critical values of (L/μ) were correlated by Eq. (4') for all the solvents except water, for which the critical value (L/μ) was found to be equal to 1300. Experimental results ranging below these critical points are expressed by Eq. (5) while those above them are expressed by Eqs. (6) and (7).
From Eqs. (5) and (6), the exponent of Schmidt number relating to (kLa/DL) was found to be approximately 1/2. This value agrees quite well with the results obtained by Sherwood and Holloway as well as those of our previous investigation₆₎ and the prediction by Higbie.

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The filtration behaviours of the slurry mixtures consisting of two components with known filtration charactcristics, i.e., Hongkong Kaolins "Pink" and "Dark-Yellow, " were investigated. The equilibrium porosities εX, mass ratios of wet cake to dry cake mX', average specific resistances of cakes α'f·s·X, average effective specific surface areas S_s·X and Ruth's coefficients K'20·f·X of the slurry mixtures were studied in order to correlate them with those of the pure components. The characteristics of the two constituents are shown in Table 1 as well as in our former report³⁾ Brief summaries of the results are as follows:
(i) Average effective specific surface areas calculated from Eq. (6) were found to be not additive, on the volume basis, as shown in Fig. 7. In this case, (√k·S²_s·X)P was always larger than (√k·S²_s·X)l·P by about 11.8-0.1%, when the range for s=0.1-0.3 and P=500-9000[gr/cmcm²].
(ii) The same tendency as in (i) was noticed of the results of permeability experiments as revealed in Fig. 3.
(iii) Average specific resistance, α'f·s·X and K'20·f·X vs. X were rather complicated as shown in Figs. 8 and 9, respectively.
(iv) (√k·S²_s·X)P was nearly equal to (√k·S²_s·X)l'P when the range of s≥0.2 and P=1000-9000 [gr/cmcm2]. The difference between them was less than 7.4%.
(v) Due to the fact that the equilibrium porosities and mass ratios of wet cake to dry cake of each component were approximately equal, as shown in Table 1, the equilibrium porosity εX showed a linear relation against X' as represented by Eq. (1) and Fig. 2. Also mX vs. X was linear as represented by Eq. (2).

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Heat transfer in a barometric condenser was considered as unsteadystate thermal conduction in a cooling water column which directly comes into contact with the condensing steam. As the result of the theoretical analysis and experiment, the following relationships were obtained:
in which correction factor α may be set at 1.5.
A method for designing barometric condenser was obtained by using the above equations.

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As one of the rate expressions of high pressure ammonia synthesis in which industrial iron catalyst is employed, Temkin's Eqs. (1) and (2) are well known, but neither of them satisfy the data published by other investigators. This has been pointed out by Emmett, Uchida, Comings and others.
The authors propose here some rate expressions, Eqs. (10) and (11) which they have obtained after examining all the data available. Eq. (10) is correspondent to the case where the rate-determining step is the dissociated adsorption of nitrogen molecule and the active site of catalyst is partly covered with atomic nitrogen, viz., in the Langmuir type adsorption.
Eq. (10) is for the data of doubly or triply promoted catalyst (Cf. Fig. 1), while Eqs. (14) and (15) are for the singly promoted (by Al₂O₃) catalyst. Eq. (10) is found to be of great practical use, because the constant Ka remains constant, regardless of the variety of temperature and the kinds of catalysts employed.

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