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Prediction of Liquid Molar Volume and Heat of Vaporization of Fatty Acids Using an Equation of State

Author(s):

Michelle G. Gomes, Nattácia R. A. Felipe Rocha, Alex A. Moura, Nadine P. Merlo, Moilton R. Franco Júnior* and Patrisia O. Rodrigues   Pages 1 - 11 ( 11 )

Abstract:


Background: The liquid molar volume (V) and the heat of vaporization (∆H¹vap) of four fatty acids (n-Heptanoic acid, Hexadecanoic acid, n-Hexanoic acid and n-Dodecanoic acid) have been estimated.

Objective: This paper aims to calculate liquid molar volume and the heat of vaporization of four fatty acids under to the critical point using two traditional equations of state.

Method: The area rules method applicable to obtaining the saturation pressure of the compounds has been used. The properties of the acids investigated in this work have been compared with those provided by literature..

Results: For molar volumes, the equations of state have given improved predictions when compared to a traditional equations such as Rackett equation and so on. According to the vapor enthalpy calculations, no reference value was need for. In general, the Clausius-Clapeyron equation provides a better estimation of the vaporization enthalpy of fatty acids when Soave-Redlich-Kwong (SRK) equation was used.

Conclusion: Accurate results for heat of vaporization can be reached in comparison with the Watson equation if reliable equation of state is used.

Keywords:

Fatty acids, vaporization enthalpy, Maxwell rule, biodiesel, large chain, Equation of State

Affiliation:

Programa de Pos-graduação em Biocombustíveis - Instituto de Química - Universidade Federal de Uberlândia, 38408-100 Uberlândia, UniRV –Universidade de Rio Verde - Faculdade de Biologia e Química – Rio Verde – Goiás, UniRV –Universidade de Rio Verde - Faculdade de Engenharia Mecânica – Rio Verde – Goiás, UniRV –Universidade de Rio Verde - Faculdade de Biologia e Química – Rio Verde – Goiás, Programa de Pos-graduação em Biocombustíveis - Instituto de Química - Universidade Federal de Uberlândia, 38408-100 Uberlândia, Programa de Pos-graduação em Biocombustíveis - Instituto de Química - Universidade Federal de Uberlândia, 38408-100 Uberlândia



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