| Description |
xii, 136 leaves : illustrations ; 28 cm. |
| Summary |
"A porous plate, initially at a uniform solute concentration is immersed in a well-stirred pure solvent bath of known volume. It is desired to find the molecular diffusivity of the solute-solvent system by observing the change of the solute concentration in the solvent bath with time. In this study, concentration-time data were curve-fitted by non-linear, least squares techniques to the various mathematical solutions describing molecular diffusion in the porous frit. This technique is used to determine the diffusion coefficient and predict the value of other parameters existing in the different mathematical diffusion models. The results from the different models are critically compared. The following solute-solvent systems were studied in this work: ethylene glycol in ethylene glycol; ethylene glycol in diethylene glycol; ethylene glycol in propylene glycol; cyclohexanol in ethylene glycol; cyclohexanol in diethylene glycol; and cyclohexanol in propylene glycol at 25, 30, 40 and 50°C. The experimental diffusivities determined in this study were then compared with the vales from the proposed prediction equations of Wilke-Chang, Gainer and Metzner, and Mitchell"--Abstract, leaf ii. |
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