Abstract

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.