Grasas y Aceites, Vol 46, No 3 (1995)

A Study of mixtures of organic solvents and triglycerides of linseed oil or the free fatty acids. 1.- Molar volume, molar refraction and dynamic viscosity


https://doi.org/10.3989/gya.1995.v46.i3.923

C. Mantell Serrano
Departamento de Ingeniería Química. Universidad de Cádiz, Spain

M. J. Muñoz Cueto
Departamento de Ingeniería Química. Universidad de Cádiz, Spain

M. Galán Vallejo
Departamento de Ingeniería Química. Universidad de Cádiz, Spain

M. Rodríguez Rodríguez
Departamento de Ingeniería Química. Universidad de Cádiz, Spain

Abstract


Measurements of molar volume, refraction index and dynamic viscosity in mixtures of fatty acids or triglycerides and trichloroethylene, tetrachloroethylene and hexane were realized. Temperature range studied was 278-313 K each 5 K. The relationship between molar volume and molar fraction show high correlation coefficient In fatty acids with trichloroethylene and tetrachloroethylene mixtures. On the other hand, hexane mixtures show little contractions of molar volume at low molar fractions. Triglyceride mixtures present important deviations with regard to the ideality of the molar volume. The adjusts obtained for the molar volume values versus temperature are acceptable, calculating the coefficients of thermal expansion of the studied mixtures. Equally, the adjust of the experimental results of viscosity for two prediction equations are studied: one of additive type and the other of parabolic type.

Keywords


Dynamic viscosity; Fatty acids mixture; Molar refraction; Molar volumen; Triglycerides mixture

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