This is a flowsheet of the
experimental apparatus used for the absorption study and main results
obtained in term of difference between the carbon dioxide concentration
entering and exiting from the column depending on the different
experimental conditions.
Credit: TECHNOLOGY
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.
A team of researchers from the Univerit¨¤ degli Studi di Milano and
Politecnico di Milano in Italy, have demonstrated the possibility to
perform a first important step in the biogas upgrading to biomethane
using cost-effective conditions in terms of pressure and temperature by
physical absorption column technology. The work was developed both from
an experimental and computational point of view. The experimental work
was made by the experimental apparatus reported in the figure, while the
simulation study was performed by using PRO II SIMSCI simulation
software.
"We propose a well-known technology for the separation of CO2
from biogas mixture, but using different operating conditions relative
to the traditional one. Our idea is to perform the absorption of CO2
in water by using low temperature (in the range 5 -- 15C) coupled with
atmospheric pressure. This technology 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. This study demonstrated the
feasibility of the first step of this approach, while ongoing research
to validate the whole process of the double column configuration is now
in process," says Professor Carlo Pirola, Ph.D., of the Universit¨¤
degli Stuidi di Milano and Principal Investigator of this paper.
Story Source:
The above post is reprinted from
materials provided by
World Scientific.
Note: Materials may be edited for content and length.
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