Biohydrogen purification using methyldiethanolamine and caustic in a two stage absorption system

As the research on biohydrogen production is growing, there is a need to explore the most suitable way to purify the biogas produced from the fermentation process so that pure biohydrogen can be obtained. The common biohydrogen gas composition produced from biological process is mainly hydrogen (H2)...

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Main Author:	Abdul Muin, Nor Azira
Format:	Thesis
Language:	English
Published:	2019
Subjects:	TP Chemical technology
Online Access:	http://eprints.utm.my/id/eprint/86157/1/NorAziraAbdulMSChE2019.pdf
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spelling	my-utm-ep.861572020-08-30T09:04:55Z Biohydrogen purification using methyldiethanolamine and caustic in a two stage absorption system 2019 Abdul Muin, Nor Azira TP Chemical technology As the research on biohydrogen production is growing, there is a need to explore the most suitable way to purify the biogas produced from the fermentation process so that pure biohydrogen can be obtained. The common biohydrogen gas composition produced from biological process is mainly hydrogen (H2) and carbon dioxide (CO2). The presence of CO2 in biohydrogen will affect its application if biohydrogen is used in fuel cell application. In this work, solvent absorption was selected due to its simplicity and low cost. The CO2 removal was performed by using two stage solvent absorption at which the activated methyldiethanolamine (MDEA) was used in the first stage and caustic (NaOH) in the second stage. The MDEA was activated by adding piperazine (PZ) into the MDEA solution. It was added to improve the reaction between CO2 and MDEA. The operating pressure and temperature were 1 bar and 33°C respectively. The simulated untreated biohydrogen gas contained 50 mol% of H2 and 50 mol% of CO2 . At first, 40 wt% MDEA was activated with different concentration of PZ and evaluated. It was found that 6 wt% of PZ was required to fully activate the 40 wt% MDEA. Next, the CO2 removal was improved by implementing an improvised gas distributor at the first stage. Lastly, the CO2 removal was further improved by utilizing a wire mesh packing at the first stage as to improve the contact area between the gas and the chemical solvent. At the same time caustic stage containing 20 wt% NaOH was added as the second stage. By doing so, the highest CO2 removal achieved in this study at the first stage was 86% and 99.59% at the second stage, producing treated biohydrogen gas with purity of >99 mol%. Hence, this system has great potential to be used as a proper CO2 removal system for biohydrogen gas produced by fermentation process. 2019 Thesis http://eprints.utm.my/id/eprint/86157/ http://eprints.utm.my/id/eprint/86157/1/NorAziraAbdulMSChE2019.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:131619 masters Universiti Teknologi Malaysia, Faculty of Engineering - School of Chemical & Energy Engineering Faculty of Engineering - School of Chemical & Energy Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Abdul Muin, Nor Azira Biohydrogen purification using methyldiethanolamine and caustic in a two stage absorption system
description	As the research on biohydrogen production is growing, there is a need to explore the most suitable way to purify the biogas produced from the fermentation process so that pure biohydrogen can be obtained. The common biohydrogen gas composition produced from biological process is mainly hydrogen (H2) and carbon dioxide (CO2). The presence of CO2 in biohydrogen will affect its application if biohydrogen is used in fuel cell application. In this work, solvent absorption was selected due to its simplicity and low cost. The CO2 removal was performed by using two stage solvent absorption at which the activated methyldiethanolamine (MDEA) was used in the first stage and caustic (NaOH) in the second stage. The MDEA was activated by adding piperazine (PZ) into the MDEA solution. It was added to improve the reaction between CO2 and MDEA. The operating pressure and temperature were 1 bar and 33°C respectively. The simulated untreated biohydrogen gas contained 50 mol% of H2 and 50 mol% of CO2 . At first, 40 wt% MDEA was activated with different concentration of PZ and evaluated. It was found that 6 wt% of PZ was required to fully activate the 40 wt% MDEA. Next, the CO2 removal was improved by implementing an improvised gas distributor at the first stage. Lastly, the CO2 removal was further improved by utilizing a wire mesh packing at the first stage as to improve the contact area between the gas and the chemical solvent. At the same time caustic stage containing 20 wt% NaOH was added as the second stage. By doing so, the highest CO2 removal achieved in this study at the first stage was 86% and 99.59% at the second stage, producing treated biohydrogen gas with purity of >99 mol%. Hence, this system has great potential to be used as a proper CO2 removal system for biohydrogen gas produced by fermentation process.
format	Thesis
qualification_level	Master's degree
author	Abdul Muin, Nor Azira
author_facet	Abdul Muin, Nor Azira
author_sort	Abdul Muin, Nor Azira
title	Biohydrogen purification using methyldiethanolamine and caustic in a two stage absorption system
title_short	Biohydrogen purification using methyldiethanolamine and caustic in a two stage absorption system
title_full	Biohydrogen purification using methyldiethanolamine and caustic in a two stage absorption system
title_fullStr	Biohydrogen purification using methyldiethanolamine and caustic in a two stage absorption system
title_full_unstemmed	Biohydrogen purification using methyldiethanolamine and caustic in a two stage absorption system
title_sort	biohydrogen purification using methyldiethanolamine and caustic in a two stage absorption system
granting_institution	Universiti Teknologi Malaysia, Faculty of Engineering - School of Chemical & Energy Engineering
granting_department	Faculty of Engineering - School of Chemical & Energy Engineering
publishDate	2019
url	http://eprints.utm.my/id/eprint/86157/1/NorAziraAbdulMSChE2019.pdf
_version_	1747818498186280960

Biohydrogen purification using methyldiethanolamine and caustic in a two stage absorption system

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