Evaluation of Optimal Methods for Critical Properties and Acentric Factor of Biodiesel Compounds with Their Application on Soave鈥揜edlich鈥揔wong and Peng鈥揜obinson Equations of State

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• 作者：Frederico R. do Carmo ; Nathan S. Evangelista ; Fabiano A. N. Fernandes ; Hosiberto B. de Sant鈥橝na
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2015
• 出版时间：November 12, 2015
• 年：2015
• 卷：60
• 期：11
• 页码：3358-3381
• 全文大小：715K
• ISSN：1520-5134

文摘

In this work, different methods capable of estimating some properties of fatty acid methyl esters (FAMES) and fatty acid ethyl esters (FAEES) have been evaluated. The results for T<sub>bsub> indicated that the methods of Constantinou and Gani and Marrero and Gani should be applied for FAMES and FAEES, respectively. The evaluation of the methods for critical properties and acentric factor was performed by comparisons between the experimental values and output values by the Racket鈥揝oave equation. The results indicated that different packages should be applied for FAMES, FAEES, and hydroxy-esters. For critical volume estimations, the method of Marrero and Pardillo should be used for any alkyl ester present in biodiesel. Three versions of the group contribution (GCVOL) method as well as the Rackett鈥揝oave equation were employed to estimate pure alkyl esters and biodiesel density. All these methods showed good results in moderate temperatures, but only Rackett鈥揝oave is indicated for high temperatures. A final validation of the chosen packages for critical properties and acentric factor was performed by applying the estimated values of these properties on Peng鈥揜obinson and Soave鈥揜edlich鈥揔wong equations of state. Additionally, a fully predictive translated volume methodology has been proposed and presented good accuracy.