Measurement of the Diffusivities of CO<SUB>2</SUB> in Liquids by Liquid Jets

Abstract

(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 (lmin) and the maximum jet length (lmax), was determined as in Figs. 6 and 8 and lmax/d was confirmed to be proportional to We0.5.(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.