Diffusion of Benzyl Acetate, 2-Phenylethyl Acetate, 3-Phenylpropyl Acetate, and Dibenzyl Ether in Mixtures of Carbon Dioxide and Ethanol

详细信息    查看全文

• 作者：Octavio Su&aacute ; rez-Iglesias ; Ignacio Medina ; Consuelo Pizarro ; Julio L. Bueno
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2007
• 出版时间：May 23, 2007
• 年：2007
• 卷：46
• 期：11
• 页码：3810 - 3819
• 全文大小：372K
• 年卷期：v.46,no.11(May 23, 2007)
• ISSN：1520-5045

文摘

Diffusion coefficients of four solutes at infinite dilution (benzyl acetate, 2-phenylethyl acetate, 3-phenylpropylacetate, and dibenzyl ether) were measured in the system CO₂ + ethanol from 313.16 to 333.16 K and pressuresbetween 15 and 35 MPa over the full concentration range of the CO₂ + ethanol mixture. The diffusionalbehavior in the mixed solvent was compared with the estimation of seven simple predictive equations, LeBlanc, Wilke-Chang, Holmes-Olander-Wilke, Tang-Himmelblau (two formulas), Perkins-Geankoplis,and Leffler-Cullinam, observing that the first two give errors between 17 and 30% and that deviations lowerthan 11% are only obtained with the expressions of Tang-Himmelblau. Nevertheless, as none of the studiedequations considers the self-association of ethanol nor complex formation between solute and alcohol molecules,the model of Lusis-Ratcliff and Mohan-Srnivasan was extended to a ternary liquid-supercritical systemwith the diffusing component dilute, obtaining average absolute deviations lower than 4.6% for the diffusivitiesof the four solutes. Nevertheless, the extension of this model is correlative (it needs one adjustable parameterfor each solute), not predictive.