液柱塔によるCO₂の拡散係数の測定

抄録

(1) An easy and reliable method for determing the diffusivities of CO₂ in liquids was obtained from the experiment in which the so-called bell-shaped nozzles as shown in Fig. 2 and the jet-receiver calibrated in degrees of absorption were employed, while the pressure in the absorption chamber was held as high as 2-3mm H₂O.
(2) To practice the above method, the stationary range of the jet, i.e., the minimum jet length (l_min) and the maximum jet length (lmax), was determined as in Figs. 6 and 8 and lmax/d was confirmed to be proportional to We^0.5.
(3) The diffusivities of CO₂ in glycerine and cane sugar aqueous solutions were measured. The results shown in Figs. 9 and 11 proved to be in good agreement with the values obtained from the correlation of Othmer & Thakar, ¹³⁾ by calculation.
(4) The diffusivities of CO₂ in ethanol were measured in the temperature range of 6.4-20°C. The results are shown in Figs. 12 and Table 1.
(5) The diffusivities of CO₂ in NaOH and KOH solutions were measured at 20°C. The results are shown in Table 2. Their values of DLμ are mostly constant and accord with the value (1.79×10^-5cm²·c.p./sec) in H₂O.
(6) Dependence of the concentration of CO₂ on the diffusivity of CO₂ in H₂O was investigated at 20°C. The results are shown in Fig. 14.