Grasas y Aceites, Vol 50, No 6 (1999)

Influence of the critical parameters on the density estimate of some fatty acids by the Rackett's method.


https://doi.org/10.3989/gya.1999.v50.i6.691

F. O. Cedeño González
Departamento de Explotación Industrial, Facultad de Mecánica. Universidad de Cienfuegos., Cuba

M. M. Prieto González
Departamento de Energía, ETS de Ingenieros Industriales de Gijón. Universidad de Oviedo., Spain

R. Alonso Suárez
Departamento de Energía, ETSIMO. Escuela Técnica Superior de Ingenieros de Minas de Oviedo. Universidad de Oviedo., Spain

J. C. Bada Gancedo
Instituto de Productos Lácteos de Asturias. CSIC., Spain

Abstract


In this work a comparative study is carried out of the critical properties of temperature and pressure applied for the palmitic, stearic and oleic fatty acids, provided by different bibliographical sources. These properties are used in the Rackett's equation to estimate the density of the pure substances. The most commonly employed methods are described and applied in these cases to estimate these critical properties. A group of values of critical properties is selected to estimate the density using the Rackett's equation. The values of the critical properties that give a better estimation of the density, according to Rackett's equation, when compared with the experimental results are proposed. It is demonstrated that the selection of the critical properties influences in a decisive way in the estimation of physical properties by means of the Rackett's equation.

Keywords


Critical pressure; Critical temperature; Density; Fatty acid; Rackett's equation

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