Optimizing of Cottonseed Oil Hydrogenation over Fixed Bed Catalyst with Use of Kinetic Simulation

Y.L. Sheludyakov1, F.K. Khabibullin2, K.A. Zhubanov2, A.G. Tomilov3 and I.D. Gorlachev4

1Institute of organic catalysis and electrochemistry MOS RK, 142 Kunaev Street, Almaty, 050023, Kazakhstan

2Research Institute of New Chemical Technologies and Materials, 95-a Karasai Batyr Street, Almaty, 050012, Kazakhstan

3Combustion Problems Institute, 480012, Almaty, 172, Bogenbai Batyr str., Kazakhstan

4Institute of Nuclear Physics, 1 Ibragimov Street, Almaty, 050082, Kazakhstan

Abstract

Effect of temperature, hydrogen and oil flow rates on the quality of the products of cottonseed oil hydrogenation was investigated for different Ni-Al catalysts promoted with Ti, Cr, Mo, Cu, Fe. Fixed bed catalyst is used to exclude filtration stage from the technological flow sheet. Surface of the catalyst granules was preliminary leached to increase the area. Linear correlation between melting point and iodine value of the products was revealed, and correlation coefficients for different catalysts have been established. It was found out that minimum melting point and maximum hardness corresponds to the products with the following fatty acid composition: 5% of stearic acid, 45% of oleic acid and 20% linoleic acid. Comparison criteria for the catalysts with use of kinetic model were discussed, and 60% conversion of linoleic acid was selected as the optimum level for hydrogenation process to target products. Introduction of copper, iron and molybdenum in the Ni-Al-Cr-Ti alloy (Basic alloy) allows increasing activity and selectivity of the catalysts. In optimum conditions at 180С the row of activity of the catalysts is as follows: Fe > Mo > Cu > Basic alloy and the row of selectivity: Cu > Fe > Bas > Mo.