Analysis and modelling of the solubility of biogas components in water for physical absorption processes

Petronela Cozma1, Walter Wukovits2, Ioan Mamaliga3, Anton Friedl2, Maria Gavrilescu1,4

1 Gheorghe Asachi Technical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, Department of Environmental Engineering and Management, 73 Prof. Dr. Docent Dimitrie Mangeron Street, 700050 Iasi, Romania
2 Vienna University of Technology, Institute of Chemical Engineering, Getreidemarkt 9/166, A 1060 Vienna, Austria
3 Gheorghe Asachi Technical University of Iasi, Department of Chemical Engineering, 73 Prof. dr. doc. D. Mangeron Street, 700050 Iasi, Romania
4 Academy of Romanian Scientists, 54 Splaiul Independentei, RO-050094 Bucharest, Romania


Biogas can be used as a renewable and green energy source by upgrading to natural gas. Water scrubbing, which is one of the most widely-applied upgrading technologies, involves an accurate knowledge of the solubility of the main biogas components in water, which is essential to the design and optimization of the biogas upgrading process. In this work, we use several thermodynamic models available in the Aspen Plus software modeling environment to calculate the solubility of the main biogas components (CO2, CH4, H2S, N2, O2) in water, considering physical absorption processes. Our modeling results are then compared with experimental data from the related literature, and the most suitable thermodynamic model is thus determined. Such an appropriately-selected model can then be efficiently applied for further analyses, such as the simulation of the water scrubbing process.


activity coefficient methods; gas solubility; Henry s law; thermodynamic model; water scrubbing process

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