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Author:Hassan, Raja Muddassar
Title:Utilization of synthesis gas
Publication type:Master's thesis
Publication year:2010
Pages:vi + 95      Language:   eng
Department/School:Kemian laitos
Main subject:Tehdassuunnittelu   (Kem-107)
Supervisor:Hurme, Markku
Instructor:Melin, Kristian
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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In the closed network of Learning Centre you can read digital and digitized theses not available in the open network.

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Location:P1 Ark Aalto  1899   | Archive
Keywords:biomass
gasification
synthesis gas
biofuel
Abstract (eng): In recent years due to increased human awareness global warming and various environmental issues caused by the human activities, an increased interest has been observed in adopting renewable energy sources and more efficient processes for climate change mitigation.
Synthesis gas which is a mixture of CO and H2 with other impurities is product of gasification process.
Biomass is increasingly used as a raw material in gasification process but the synthesis gas thus produced has varying content of impurities such as NOx, SOx, COS, H2S, CO2.
In this project a unique approach is adopted to produce clean synthesis gas for power generation or hydrogen production and also to adjust synthesis gas for the production of other useful chemicals and fuels.

For this process simple air based gasifier can be used.
The impurities contained in the formed synthesis gas are absorbed at air or under elevated pressure to basic solution that contain bicarbonates or hydroxides.
The CO present in the syngas reacts with the basic solution and produce formate.
The formate solution formed can be thermally decomposed to H2, CO or formaldehyde while the salts of the impurities are retained in the solution.
The salts produced in the thermal decomposition can be recycled back directly to the formate manufacturing step.
The process is quite economical to integrate in the existing large scale chemical plants that consume hydrogen as a raw material.
The production cost for hydrogen by this process is nearly 2 kEUROS/t and payback period is about 5 years.
The impurities are separated by converting into suitable products.
ED:2012-02-02
INSSI record number: 43912
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