Biogas to biomethane upgrading by water absorption column at low pressure and temperature

July 7, 2015
Biogas to biomethane upgrading by water absorption column at low pressure and temperature
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 Università 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 column . 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. The report will appear in the Technology journal.

"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 . 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.

Explore further: Promising new aqueous approach to carbon capture

More information: www.worldscientific.com/doi/abs/10.1142/S2339547815400014

Related Stories

Promising new aqueous approach to carbon capture

November 11, 2014

A new approach to carbon capture technology from DOE's Savannah River National Laboratory has the potential to open global markets for cost-effective industrial carbon dioxide (CO2) capture and reuse.

First-of-a-kind supercritical CO2 turbine

October 20, 2014

Toshiba Corporation today announced that it will supply a first-of-a-kind supercritical CO2 turbine to a demonstration plant being built in Texas, USA. The plant will be developed by NET Power, LLC, a U.S. venture, together ...

'Waste heat' may economize CO2 capture

March 28, 2013

In some of the first results from a federally funded initiative to find new ways of capturing carbon dioxide (CO2) from coal-fired power plants, Rice University scientists have found that CO2 can be removed more economically ...

New material captures carbon at half the energy cost

March 11, 2015

UC Berkeley chemists have made a major leap forward in carbon-capture technology with a material that can efficiently remove carbon from the ambient air of a submarine as readily as from the polluted emissions of a coal-fired ...

Recommended for you

Samsung to disable Note 7 phones in recall effort

December 9, 2016

Samsung announced Friday it would disable its Galaxy Note 7 smartphones in the US market to force remaining owners to stop using the devices, which were recalled for safety reasons.

Swiss unveil stratospheric solar plane

December 7, 2016

Just months after two Swiss pilots completed a historic round-the-world trip in a Sun-powered plane, another Swiss adventurer on Wednesday unveiled a solar plane aimed at reaching the stratosphere.

Solar panels repay their energy 'debt': study

December 6, 2016

The climate-friendly electricity generated by solar panels in the past 40 years has all but cancelled out the polluting energy used to produce them, a study said Tuesday.

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.