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Title:
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EFFECT OF TEMPERATURE ON CARBON DIOXIDE ABSORPTION USING SODIUM HYDROXIDE IN BIOGAS UPGRADING |
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Author(s):
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Ireen Maile, Edison Muzenda and Charles Mbohwa |
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ISBN:
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978-989-8533-73-9 |
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Editors:
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Theodora Issa, Tomayess Issa, Pedro Isaias and Ana Hol |
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Year:
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2017 |
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Edition:
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Single |
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Keywords:
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Biomethane, Caustic Solutions, Carbon Dioxide, Removal Efficiency |
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Type:
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Full Paper |
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First Page:
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59 |
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Last Page:
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65 |
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Language:
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English |
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Cover:
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Full Contents:
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click to dowload 
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Paper Abstract:
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Biogas upgrading is the process of removing carbon dioxide from the biogas after the other impurities have been removed. Typical biogas from anaerobic digestion process contains 50-70% methane, 30-50% carbon dioxide and trace gases such as hydrogen sulfide. Chemical absorption is one of the techniques used and has a potential to produce biomethane with over 95% methane. The temperature effect was studied using the biochemical methane potential test system and the Buchner flask system. The temperature variation was from 20 to 40 °C with a ?T of 10 °C. The sodium hydroxide solution was at a concentration of 3M. An increase in temperature resulted in an increase in the absorption rate and an improvement in the gas composition. However, there was no significant difference between the 30 °C and 40 °C temperature variance. This is simply because high temperatures are normally employed for absorption with alkalis. The highest composition of methane reached was 87% and 90%, the lowest carbon dioxide content obtained was 12% and 9% for the 30 and 40 °C temperature respectively. Temperature does improve the absorption rate and capacity of the chemical absorbent. |
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