(600k) Mechanism and Reaction Kinetics for Hydrotreatment of PALM OIL for Greendiesel Production | AIChE

(600k) Mechanism and Reaction Kinetics for Hydrotreatment of PALM OIL for Greendiesel Production

Authors 

Vélez, F. - Presenter, Universidad Nacional de Colombia – Sede Medellín, Facultad de Minas, Bioprocesos y Flujos reactivos
Sakashita, K., OFFICE OF KS PROCESSTECH
Molina, A., Universidad Nacional de Colombia – Sede Medellín, Facultad de Minas, Bioprocesos y Flujos reactivos






MECHANISM AND KINETICS REACTION
HYDROTREATMENT OF PALM OIL FOR GREENDIESEL PRODUCTION

J.F.
Vélez1, K. Sakashita1, 2, S. Asaoka1, 3,
A.
Ishihara1, 4, D. López5, G. Hincapié5, J.D.
Tapia5, A. Molina1*

1Universidad
Nacional de Colombia-Sede Medellín,

Facultad
de Minas,
Bioprocesos y Flujos
reactivos

2Office of Ks Processtech,
9-41-2101, Shinonome 1-chome, Kouto-ku,
Tokyo, 135-0062, Japan

3Office Asaoka, 1-23-1, Konandai, Konan-ku, Yokohama,
234-0054, Japan

4 Division of Chemistry for Materials, Graduate School of Engineering,
Mie University, Mie Pref., Japan

5Química de
Recursos Energéticos y Medio Ambiente, Instituto de Química, Universidad de
Antioquia, Medellín, Colombia

*Corresponding author: amolinao@unal.edu.co

Experiments for the hydrotreatment
of Refined, Bleached and Deodorized Palm Oil (RBDPO) were carried out in a
batch reactor at temperatures varying from 335°C to 365°C and pressures in the
range of 30 bar to 60 bar. Hydrotreatment
transforms vegetable oils, in this case RBDPO, into a zero-sulfur liquid with
properties that resemble those of diesel fuel. In a hydrotreatment
reactor, high-pressure addition of hydrogen reduces the size
of the triglycerides molecules through deoxy and decarbonate hydrocracking. The experiments to
determine the HVO kinetics involved a commercial catalyst. The catalyst presulfurization for activation and stabilization was
carried out ex situ in a continuous fixed bed reactor. DMDS was entrained by a
nitrogen flow at 400°C to guarantee, due to the decomposition of DMDS, that the
catalyst was exposed to H2S for 9 hours. The activated catalyst was
then used in a batch reactor to carry out the hydrotreatment
reaction. The liquid products formed through the reaction (mainly fatty acids
and hydrocarbons) were analyzed by means of a GC-MS and the gaseous products
were characterized with a micro GC. The sample of RBDPO was obtained from a local
palm oil company and was mainly composed of oleic (38.8 %w), palmitic (34.6 %w), linoleic (13.1 %w) and stearic (8.1 %w)
triglycerides. The analysis of the products showed the presence of hydrocarbons
varying from 13 to 20 carbon atom; palmitic, oleic
and steric acids and di and monoglycerides. Conversion
of the RBDPO was higher than 50% for all the experiments. A mechanism that
considers the conversion of triglycerides to mono-glycerides and carboxylic
acids and the subsequent hydrodeoxygenated to form
hydrocarbons was proposed, as well as kinetic expressions for the reactions in
the mechanism following a constrained optimization procedure.

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