Direct liquefaction of Mukah Balingian low rank Malaysian coal using water-tetralin mixture at supercritical state / Zaidi Ab Ghani

Direct liquefaction on untreated Mukah Balingian (MB) coal using water-tetralin mixture was successfully performed in batch-wise reactor system, carried out at temperatures of 375 - 450°C and under pressure up to 22 MPa. The coal conversion and oil+gas yield obtained at optimum conditions of 450°C a...

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Main Author:	Ab Ghani, Zaidi
Format:	Thesis
Language:	English
Published:	2010
Subjects:	Analytical chemistry
Online Access:	https://ir.uitm.edu.my/id/eprint/27668/1/TM_ZAIDI%20AB%20GHANI%20AS%2010_5.pdf
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spelling	my-uitm-ir.276682022-06-13T09:00:14Z Direct liquefaction of Mukah Balingian low rank Malaysian coal using water-tetralin mixture at supercritical state / Zaidi Ab Ghani 2010 Ab Ghani, Zaidi Analytical chemistry Direct liquefaction on untreated Mukah Balingian (MB) coal using water-tetralin mixture was successfully performed in batch-wise reactor system, carried out at temperatures of 375 - 450°C and under pressure up to 22 MPa. The coal conversion and oil+gas yield obtained at optimum conditions of 450°C and 70:30 tetralin to water ratio, 22 MPa, 30 min reaction time, 1:10 coal-to-solvent ratio and with 500 rpm stirring rate, were 70.6 % and 66.1 % respectively. It was observed that heat plays an important role in comparison to pressure in contributing to high coal conversion and oil+gas yield, and these results are well correlated with the high content of reactive macerals. The addition of tetralin to water increased the coal conversion and oil+gas yield by the stabilization of radical fragments and inhibition of radical recombination. In this study, the application of response surface methodology (RSM) and central composite rotatable design (CCRD) for modeling the influence of reaction temperature and solvent mixed ratios on the liquefaction of MB coal. Predicted values were found to be in good agreement with the experimental values (R2 values of 0.9989 and 0.9931 for coal conversion and oil+gas yield respectively).This study has shown that the CCRD and RSM could efficiently be applied for the modeling liquefaction of coal and it is economical way of obtaining the maximum amount of information in a short period of time and with the fewest number of experiments. In this study, microwave irradiation pretreatment was applied on MB coal prior to coal conversion and products yield. The coal conversion and oil+gas yield obtained increased up to 8 - 16 % and 10 - 19 %, respectively. Inherent moisture in coal was found to be the determining factor in increasing coal conversion and oil+gas yield by absorbing the microwave energy in order formation of cracks and fissures in coal microstructure that enhanced the coal-to-solvent interaction, and the weakened C-C bonds, respectively. 2010 Thesis https://ir.uitm.edu.my/id/eprint/27668/ https://ir.uitm.edu.my/id/eprint/27668/1/TM_ZAIDI%20AB%20GHANI%20AS%2010_5.pdf text en public masters Universiti Teknologi MARA Faculty of Applied Sciences
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Analytical chemistry
spellingShingle	Analytical chemistry Ab Ghani, Zaidi Direct liquefaction of Mukah Balingian low rank Malaysian coal using water-tetralin mixture at supercritical state / Zaidi Ab Ghani
description	Direct liquefaction on untreated Mukah Balingian (MB) coal using water-tetralin mixture was successfully performed in batch-wise reactor system, carried out at temperatures of 375 - 450°C and under pressure up to 22 MPa. The coal conversion and oil+gas yield obtained at optimum conditions of 450°C and 70:30 tetralin to water ratio, 22 MPa, 30 min reaction time, 1:10 coal-to-solvent ratio and with 500 rpm stirring rate, were 70.6 % and 66.1 % respectively. It was observed that heat plays an important role in comparison to pressure in contributing to high coal conversion and oil+gas yield, and these results are well correlated with the high content of reactive macerals. The addition of tetralin to water increased the coal conversion and oil+gas yield by the stabilization of radical fragments and inhibition of radical recombination. In this study, the application of response surface methodology (RSM) and central composite rotatable design (CCRD) for modeling the influence of reaction temperature and solvent mixed ratios on the liquefaction of MB coal. Predicted values were found to be in good agreement with the experimental values (R2 values of 0.9989 and 0.9931 for coal conversion and oil+gas yield respectively).This study has shown that the CCRD and RSM could efficiently be applied for the modeling liquefaction of coal and it is economical way of obtaining the maximum amount of information in a short period of time and with the fewest number of experiments. In this study, microwave irradiation pretreatment was applied on MB coal prior to coal conversion and products yield. The coal conversion and oil+gas yield obtained increased up to 8 - 16 % and 10 - 19 %, respectively. Inherent moisture in coal was found to be the determining factor in increasing coal conversion and oil+gas yield by absorbing the microwave energy in order formation of cracks and fissures in coal microstructure that enhanced the coal-to-solvent interaction, and the weakened C-C bonds, respectively.
format	Thesis
qualification_level	Master's degree
author	Ab Ghani, Zaidi
author_facet	Ab Ghani, Zaidi
author_sort	Ab Ghani, Zaidi
title	Direct liquefaction of Mukah Balingian low rank Malaysian coal using water-tetralin mixture at supercritical state / Zaidi Ab Ghani
title_short	Direct liquefaction of Mukah Balingian low rank Malaysian coal using water-tetralin mixture at supercritical state / Zaidi Ab Ghani
title_full	Direct liquefaction of Mukah Balingian low rank Malaysian coal using water-tetralin mixture at supercritical state / Zaidi Ab Ghani
title_fullStr	Direct liquefaction of Mukah Balingian low rank Malaysian coal using water-tetralin mixture at supercritical state / Zaidi Ab Ghani
title_full_unstemmed	Direct liquefaction of Mukah Balingian low rank Malaysian coal using water-tetralin mixture at supercritical state / Zaidi Ab Ghani
title_sort	direct liquefaction of mukah balingian low rank malaysian coal using water-tetralin mixture at supercritical state / zaidi ab ghani
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Applied Sciences
publishDate	2010
url	https://ir.uitm.edu.my/id/eprint/27668/1/TM_ZAIDI%20AB%20GHANI%20AS%2010_5.pdf
_version_	1783733989057495040

Direct liquefaction of Mukah Balingian low rank Malaysian coal using water-tetralin mixture at supercritical state / Zaidi Ab Ghani

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