Quantitative measure of geometrical isomerization during the partial hydrogenation of triglyceride oils

Abstract

A mathematical model has been developed using a digital computer for the calculation of the isomerization index for partially hydrogenated oils such as cottonseed, soybean, peanut or corn oil. The isomerization index is defined as the ratio of the rate of geometrical isomerization of an unsaturated group to the rate of hydrogenation. Isomerization indices from about 0.3 to 11 were found to occur for hydrogenations using commercial nickel catalysts. Calculation of both an isomerization index and a selectivity ratio will be useful methods of quantitatively characterizing the partial hydrogenation of triglyceride oils or the type of hydrogenation which can be obtained by various catalysts.

The influence of the support on the properties of nickel catalysts for edible oil hydrogenation

“…It must be emphasized that the calculated selectivity, regarding the mono-and polyunsaturated fatty acid hydrogenation, is similar for both catalysts and corresponds to the published data [34][35][36][37][38][39][40].…”

Influence of Ni/SiO2 activity on the reaction pathway in sunflower oil hydrogenation

“…Literature shows a lot of mechanisms which can describe hydrogenation process of vegetable oils (Grau et al, 1988). From the simplest ones (Veldsink et al, 1997), C18:2 → C18:1 → C18:0, in which all reaction species with the same number of double bonds are shown as the same species, without distinguishing the cis-trans isomers, to the complex ones (Albright et al, 1970) that take into account the different isomers of fatty acids. In all means, the different reaction mechanisms actually point out the importance of different reactions for the observed process.…”

Supported Nickel-Based Catalysts for Partial Hydrogenation of Edible Oils

“…Several kinetics models of the hydrogenation of fatty oils containing polyunsaturated fatty acids were devised previously and reaction rate constants were evaluated for the various reactions [104][105][106][107]. All of the proposed kinetic models including various reaction pathways were incomplete.…”