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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2004
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| Online Access: | http://ir.uitm.edu.my/id/eprint/26977/ http://ir.uitm.edu.my/id/eprint/26977/1/TM_AZIL%20BAHARI%20ALIAS%20AS%2004_5.pdf |
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uitm-269772020-01-15T02:37:44Z http://ir.uitm.edu.my/id/eprint/26977/ Chemical desulphurisation of low rank Mae Moh coal via mixtures of hydrogen peroxide and hydrochloric acid solution, a mild oxidising treatment / Azil Bahari Alias 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 NonPeerReviewed text en http://ir.uitm.edu.my/id/eprint/26977/1/TM_AZIL%20BAHARI%20ALIAS%20AS%2004_5.pdf Alias, Azil Bahari (2004) Chemical desulphurisation of low rank Mae Moh coal via mixtures of hydrogen peroxide and hydrochloric acid solution, a mild oxidising treatment / Azil Bahari Alias. Masters thesis, Universiti Teknologi MARA. |
| repository_type |
Digital Repository |
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| institution |
Universiti Teknologi MARA |
| building |
UiTM Institutional Repository |
| collection |
Online Access |
| language |
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| 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 |
| 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 |
| publishDate |
2004 |
| url |
http://ir.uitm.edu.my/id/eprint/26977/ http://ir.uitm.edu.my/id/eprint/26977/1/TM_AZIL%20BAHARI%20ALIAS%20AS%2004_5.pdf |
| first_indexed |
2023-09-18T23:17:39Z |
| last_indexed |
2023-09-18T23:17:39Z |
| _version_ |
1777419219729645568 |