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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received May 25, 2006
Accepted September 1, 2006

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Catalytic cracking reaction of used lubricating oil to liquid fuels catalyzed by sulfated zirconia

Amnat Permsubscul^† Tharapong Vitidsant Somsak Damronglerd

Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand

Korean Journal of Chemical Engineering, January 2007, 24(1), 37-43(7), 10.1007/s11814-007-5006-3

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Abstract

The conversion of used lubricating oil to transport fuel by direct cracking is a suitable way to dispose of waste oil. The aim of this research was to study the catalytic cracking of used lubricating oil, and thus change its classification from a waste produce to a liquid fuel as a new alternative for the replacement of petroleum fuels. The experiments were carried out in a 70-cm3 batch microreactor at a temperature of 648-698 K, initial hydrogen pressure of 1-4MPa, and reaction time of 10-90 min over sulfated zirconia as a catalyst. The conditions that gave the highest conversion of naphtha (~20.60%) were a temperature of 698 K, a hydrogen pressure of 2MPa, and a reaction time of 60 min, whereas, under the same conditions, kerosene, light gas oil, gas oil, long residues, hydrocarbon gases, and a small amounts of solids were present (~9.04%, 15.61%, 5.00%, 23.30%, 25.58%, and 0.87%, respectively). The liquid product consisted of C7-C15 of n-paraffins, C7-C9 of branched chain paraffin and aromatic compounds such as toluene, ethylbenzene and xylene. The kinetic study reveals that the catalytic cracking of waste lubricating oil follows a second order reaction, and the kinetic model is defined as k(s^-1)=2.88×10⁴exp[.(103.68 kJmol^-1)/(RT)].

Keywords

Used Lube Oil Liquid Fuels Sulfated Zirconia Cracking Kinetic

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