Biogas to biomethane upgrading by water absorption column at low pressure and temperature
Tuesday, July 7, 2015 - 09:20
in Physics & Chemistry
Compared to other processes the innovation lies in the operating conditions. Instead of enhancing the solubility of carbon dioxide working with a pressurized system, low absorption temperature is employed. In this configuration, two main advantages can be obtained: there are no duty costs for pressurizing the system and there is no need of cleaning the absorption solvent, since the solubility of carbon dioxide in water at ambient pressure is low and any further treatment of the wastewater can be avoided. The new technology here proposed involves the use of two absorption columns: the first at atmospheric pressure for the removal of the main part of CO2 and the second one, of reduced dimension, for the final purification of biomethane.