Chemical desulphurisation of low rank Mae Moh coal via mixtures of hydrogen peroxide and hydrochloric acid solution, a mild oxidising treatment / Azil Bahari Alias

Combustion of coals to produ ce energy has created environmental problems such as sulphur, which is converted to S0₂ and S0₃ gases and the ash product. In order to produce a "clean coal" , the pre-treatment processes of sulphur removal from coal have to be effective to remove sulphur and a...

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Main Author:	Alias, Azil Bahari
Format:	Thesis
Language:	English
Published:	2004
Subjects:	Chemicals Coal
Online Access:	https://ir.uitm.edu.my/id/eprint/26977/2/26977.pdf
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spelling	my-uitm-ir.269772024-04-30T02:17:40Z Chemical desulphurisation of low rank Mae Moh coal via mixtures of hydrogen peroxide and hydrochloric acid solution, a mild oxidising treatment / Azil Bahari Alias 2004 Alias, Azil Bahari Chemicals Coal Combustion of coals to produ ce energy has created environmental problems such as sulphur, which is converted to S0₂ and S0₃ gases and the ash product. In order to produce a "clean coal" , the pre-treatment processes of sulphur removal from coal have to be effective to remove sulphur and ash without severe affects on the coal microstructure and calorific value. In this study , a mild oxidising treatment of H₂0₂ and HCl mixtures has been identified to remove sulphur and ash from low rank Mae Moh III coal (MM3). The optimum conditions achieved were 30ml 6% (0₂ content) peroxide: 70ml O.lN HCI (reagent volume mixed ratio) with leachin g temperature and time of 50°C and 8 hours , respectively. Under thes e conditions, c.a. 53%, 88%, 100%, 37% and 72% of sulphurtotal, sulphurpyrite, sulphursulphate, sulphur organic and ash were removed with 31% of coal dissolution were achieved , respectivel y. Preliminary study of desulphurisation at elevated pressure was also carried out under the optimal conditions. The results indicated that , sulphurorganic removal of fresh and pyrite-free coals were further increased to 30 and 40%, respectively. Different protic acids mixed with perox ide (H₂S0₄ and HN0₃), coal and single-reagent treatment (unmixed reagent) were also applied under the optimal conditions. The results showed that , mixtures of H₂0₂ : HCl gave higher sulphurtotal removal. Furthermore, it was found that no synergi stic effect was contributed by single-reagent treatment on the desulphurisation of MM3. The mild oxidising treatments slightly affected the coal micro structure as revealed by Scanning Electron Microscope - Energy Dispersive X-ray. Likewise, the calorific value of the treat ed coal samples was not affected as analyzed by bomb calorim eter. A kinetic analysis on pyritic remov al reaction of MM3 was found to correlat e well with a second -order rate equation that gave activation energy of 61.4 x 10⁶J kmorl־¹. 2004 Thesis https://ir.uitm.edu.my/id/eprint/26977/ https://ir.uitm.edu.my/id/eprint/26977/2/26977.pdf text en public masters Universiti Teknologi MARA Faculty of Applied Sciences
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Chemicals Coal
spellingShingle	Chemicals Coal Alias, Azil Bahari Chemical desulphurisation of low rank Mae Moh coal via mixtures of hydrogen peroxide and hydrochloric acid solution, a mild oxidising treatment / Azil Bahari Alias
description	Combustion of coals to produ ce energy has created environmental problems such as sulphur, which is converted to S0₂ and S0₃ gases and the ash product. In order to produce a "clean coal" , the pre-treatment processes of sulphur removal from coal have to be effective to remove sulphur and ash without severe affects on the coal microstructure and calorific value. In this study , a mild oxidising treatment of H₂0₂ and HCl mixtures has been identified to remove sulphur and ash from low rank Mae Moh III coal (MM3). The optimum conditions achieved were 30ml 6% (0₂ content) peroxide: 70ml O.lN HCI (reagent volume mixed ratio) with leachin g temperature and time of 50°C and 8 hours , respectively. Under thes e conditions, c.a. 53%, 88%, 100%, 37% and 72% of sulphurtotal, sulphurpyrite, sulphursulphate, sulphur organic and ash were removed with 31% of coal dissolution were achieved , respectivel y. Preliminary study of desulphurisation at elevated pressure was also carried out under the optimal conditions. The results indicated that , sulphurorganic removal of fresh and pyrite-free coals were further increased to 30 and 40%, respectively. Different protic acids mixed with perox ide (H₂S0₄ and HN0₃), coal and single-reagent treatment (unmixed reagent) were also applied under the optimal conditions. The results showed that , mixtures of H₂0₂ : HCl gave higher sulphurtotal removal. Furthermore, it was found that no synergi stic effect was contributed by single-reagent treatment on the desulphurisation of MM3. The mild oxidising treatments slightly affected the coal micro structure as revealed by Scanning Electron Microscope - Energy Dispersive X-ray. Likewise, the calorific value of the treat ed coal samples was not affected as analyzed by bomb calorim eter. A kinetic analysis on pyritic remov al reaction of MM3 was found to correlat e well with a second -order rate equation that gave activation energy of 61.4 x 10⁶J kmorl־¹.
format	Thesis
qualification_level	Master's degree
author	Alias, Azil Bahari
author_facet	Alias, Azil Bahari
author_sort	Alias, Azil Bahari
title	Chemical desulphurisation of low rank Mae Moh coal via mixtures of hydrogen peroxide and hydrochloric acid solution, a mild oxidising treatment / Azil Bahari Alias
title_short	Chemical desulphurisation of low rank Mae Moh coal via mixtures of hydrogen peroxide and hydrochloric acid solution, a mild oxidising treatment / Azil Bahari Alias
title_full	Chemical desulphurisation of low rank Mae Moh coal via mixtures of hydrogen peroxide and hydrochloric acid solution, a mild oxidising treatment / Azil Bahari Alias
title_fullStr	Chemical desulphurisation of low rank Mae Moh coal via mixtures of hydrogen peroxide and hydrochloric acid solution, a mild oxidising treatment / Azil Bahari Alias
title_full_unstemmed	Chemical desulphurisation of low rank Mae Moh coal via mixtures of hydrogen peroxide and hydrochloric acid solution, a mild oxidising treatment / Azil Bahari Alias
title_sort	chemical desulphurisation of low rank mae moh coal via mixtures of hydrogen peroxide and hydrochloric acid solution, a mild oxidising treatment / azil bahari alias
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Applied Sciences
publishDate	2004
url	https://ir.uitm.edu.my/id/eprint/26977/2/26977.pdf
_version_	1804889598219780096

Chemical desulphurisation of low rank Mae Moh coal via mixtures of hydrogen peroxide and hydrochloric acid solution, a mild oxidising treatment / Azil Bahari Alias

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