Measurements of Diffusion Coefficient of Aqueous Alkanolamines Solutions

• Main Authors: Li-Chung Chang, 張力璁
• Other Authors: Meng-Hui Li
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/nf3h6r

碩士 === 中原大學 === 化學工程研究所 === 92 === Abstract This study presents the measurements of the diffusion coefficients of alkanolamines in water at infinite dilution and the mutual diffusion coefficients of four aqueous diglycolamine, triethanolamine, 2-amino-2-methyl-l-propanol, and 2-piperidineethanol solutions. The diffusivity has been measured based on the Taylor dispersion method. Experimental work was performed at atmospheric pressure. The temperature range was from 30 to 70 oC, and the concentration of amine from 0.5 to 3 (or 4) kmol/m3. The apparatus and experimental conditions are consistent with the criteria proposed by Alizadeh et al. (1980). Experiment with the binary system of methanol and water showed that the experimental setup provides accurate mutual diffusion coefficient data. The diffusion coefficients of alkanolamines in water at infinite dilution are found to be varied systematically with the molar mass of the alkanolamines. The obtained mutual diffusion coefficients were correlated by using both a simple relation of Snijder et al. (1993) and by the UNIDIF equation (Hsu and Chen, 1998). The rough hard sphere theory (RHS) (Dymond, 1974) also successfully describes the experimental mutual diffusivities obtained in this study. Mutual diffusion coefficients can be used to model the kinetics of the reaction between CO2 and aqueous alkanolamines solutions.