Cover Image

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...

Full description

Saved in:
Bibliographic Details
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
https://ir.uitm.edu.my/id/eprint/27668/
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.uitm.ir.27668
record_format eprints
spelling my.uitm.ir.276682022-06-13T09:00:14Z https://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 https://ir.uitm.edu.my/id/eprint/27668/1/TM_ZAIDI%20AB%20GHANI%20AS%2010_5.pdf Direct liquefaction of Mukah Balingian low rank Malaysian coal using water-tetralin mixture at supercritical state / Zaidi Ab Ghani. (2010) Masters thesis, thesis, Universiti Teknologi MARA.
institution Universiti Teknologi Mara
building Tun Abdul Razak Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Mara
content_source UiTM Institutional Repository
url_provider http://ir.uitm.edu.my/
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 https://ir.uitm.edu.my/id/eprint/27668/1/TM_ZAIDI%20AB%20GHANI%20AS%2010_5.pdf
https://ir.uitm.edu.my/id/eprint/27668/
_version_ 1735572954849214464
score 13.211869

Similar Items