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:	http://ir.uitm.edu.my/id/eprint/27668/ http://ir.uitm.edu.my/id/eprint/27668/1/TM_ZAIDI%20AB%20GHANI%20AS%2010_5.pdf

id	uitm-27668
recordtype	eprints
spelling	uitm-276682020-01-23T09:01:51Z http://ir.uitm.edu.my/id/eprint/27668/ Direct liquefaction of Mukah Balingian low rank Malaysian coal using water-tetralin mixture at supercritical state / Zaidi Ab Ghani 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 NonPeerReviewed text en http://ir.uitm.edu.my/id/eprint/27668/1/TM_ZAIDI%20AB%20GHANI%20AS%2010_5.pdf Ab Ghani, Zaidi (2010) Direct liquefaction of Mukah Balingian low rank Malaysian coal using water-tetralin mixture at supercritical state / Zaidi Ab Ghani. Masters thesis, Universiti Teknologi MARA.
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Teknologi MARA
building	UiTM Institutional Repository
collection	Online Access
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
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
publishDate	2010
url	http://ir.uitm.edu.my/id/eprint/27668/ http://ir.uitm.edu.my/id/eprint/27668/1/TM_ZAIDI%20AB%20GHANI%20AS%2010_5.pdf
first_indexed	2023-09-18T23:18:47Z
last_indexed	2023-09-18T23:18:47Z
_version_	1777419291007647744

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

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