A study on liquefaction of pretreated Mukah Balingian low rank Malaysian coal / Mohd Azlan Mohd Ishak

Direct liquefaction on untreated Mukah Balingian (MB) coal was successfully carried out at temperatures and pressures of 360 – 450 °C and 4 – 13 MPa, respectively, using tetralin as hydrogen-donor solvent. The coal conversion, oil+gas, asphaltene and preasphaltene obtained at maximum conditions of 4...

Full description

Saved in:

Bibliographic Details
Main Author:	Mohd Ishak, Mohd Azlan
Format:	Thesis
Language:	English
Published:	2007
Subjects:	Transmission Heat transfer Coal Transmission. Heat transfer
Online Access:	https://ir.uitm.edu.my/id/eprint/5376/1/5376.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-uitm-ir.5376
record_format	uketd_dc
spelling	my-uitm-ir.53762022-11-15T01:47:09Z A study on liquefaction of pretreated Mukah Balingian low rank Malaysian coal / Mohd Azlan Mohd Ishak 2007 Mohd Ishak, Mohd Azlan Transmission. Heat transfer Coal Oils, fats, and waxes Direct liquefaction on untreated Mukah Balingian (MB) coal was successfully carried out at temperatures and pressures of 360 – 450 °C and 4 – 13 MPa, respectively, using tetralin as hydrogen-donor solvent. The coal conversion, oil+gas, asphaltene and preasphaltene obtained at maximum conditions of 450 °C, 4 MPa, 30 min reaction time, 1:10 coal-to-solvent ratio and with stirring, were 90%, 80%, 7% and 2%, 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. In this study, three types of pretreatments were applied on MB coal, i.e. solvent swelling, in-situ solvent soaking and heating (SSH) and microwave irradiation. In the solvent swelling pretreatment, higher swelling ratio, coal reactivity and volatile yield (Ei) were obtained when swelled in mixed solvents followed, in decreasing order, by single solvents and untreated coal. The Ei decreased from untreated coal followed by single and mixed solvents. The synergistic effect of mixed solvent swelling was attributed to good interactions between the solvent and coal reactive sites, which promoted the breaking of H-bonds in coal and eventually weakened the coal-coal macrostructure. Oil+gas yield obtained from liquefaction on the mixed solvent-swelled samples showed further enhancement at temperatures from 360 – 450 °C and reached a maximum value at 420 °C. In the SSH pretreatment, the DTG results of the pyrolysed SSH-treated coals showed the presence of highly volatile matter released at 150 – 200 °C, which was attributed to the tetralin incorporated within the coal macrostructure. The coal conversion and oil+gas yield obtained from the liquefaction of SSH-pretreated coals under various pretreatment conditions at 420 °C showed an increased of up to 7 and 12%, respectively, and was comparable to that of untreated sample at 450 °C, although the higher molecular weight preasphaltene also showed an increase. 2007 Thesis https://ir.uitm.edu.my/id/eprint/5376/ https://ir.uitm.edu.my/id/eprint/5376/1/5376.pdf text en public phd doctoral Universiti Teknologi MARA Faculty of Applied Sciences Ismail, Khudzir
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Ismail, Khudzir
topic	Transmission Heat transfer Coal Transmission. Heat transfer
spellingShingle	Transmission Heat transfer Coal Transmission. Heat transfer Mohd Ishak, Mohd Azlan A study on liquefaction of pretreated Mukah Balingian low rank Malaysian coal / Mohd Azlan Mohd Ishak
description	Direct liquefaction on untreated Mukah Balingian (MB) coal was successfully carried out at temperatures and pressures of 360 – 450 °C and 4 – 13 MPa, respectively, using tetralin as hydrogen-donor solvent. The coal conversion, oil+gas, asphaltene and preasphaltene obtained at maximum conditions of 450 °C, 4 MPa, 30 min reaction time, 1:10 coal-to-solvent ratio and with stirring, were 90%, 80%, 7% and 2%, 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. In this study, three types of pretreatments were applied on MB coal, i.e. solvent swelling, in-situ solvent soaking and heating (SSH) and microwave irradiation. In the solvent swelling pretreatment, higher swelling ratio, coal reactivity and volatile yield (Ei) were obtained when swelled in mixed solvents followed, in decreasing order, by single solvents and untreated coal. The Ei decreased from untreated coal followed by single and mixed solvents. The synergistic effect of mixed solvent swelling was attributed to good interactions between the solvent and coal reactive sites, which promoted the breaking of H-bonds in coal and eventually weakened the coal-coal macrostructure. Oil+gas yield obtained from liquefaction on the mixed solvent-swelled samples showed further enhancement at temperatures from 360 – 450 °C and reached a maximum value at 420 °C. In the SSH pretreatment, the DTG results of the pyrolysed SSH-treated coals showed the presence of highly volatile matter released at 150 – 200 °C, which was attributed to the tetralin incorporated within the coal macrostructure. The coal conversion and oil+gas yield obtained from the liquefaction of SSH-pretreated coals under various pretreatment conditions at 420 °C showed an increased of up to 7 and 12%, respectively, and was comparable to that of untreated sample at 450 °C, although the higher molecular weight preasphaltene also showed an increase.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Mohd Ishak, Mohd Azlan
author_facet	Mohd Ishak, Mohd Azlan
author_sort	Mohd Ishak, Mohd Azlan
title	A study on liquefaction of pretreated Mukah Balingian low rank Malaysian coal / Mohd Azlan Mohd Ishak
title_short	A study on liquefaction of pretreated Mukah Balingian low rank Malaysian coal / Mohd Azlan Mohd Ishak
title_full	A study on liquefaction of pretreated Mukah Balingian low rank Malaysian coal / Mohd Azlan Mohd Ishak
title_fullStr	A study on liquefaction of pretreated Mukah Balingian low rank Malaysian coal / Mohd Azlan Mohd Ishak
title_full_unstemmed	A study on liquefaction of pretreated Mukah Balingian low rank Malaysian coal / Mohd Azlan Mohd Ishak
title_sort	study on liquefaction of pretreated mukah balingian low rank malaysian coal / mohd azlan mohd ishak
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Applied Sciences
publishDate	2007
url	https://ir.uitm.edu.my/id/eprint/5376/1/5376.pdf
_version_	1783733119944228864

A study on liquefaction of pretreated Mukah Balingian low rank Malaysian coal / Mohd Azlan Mohd Ishak

Similar Items