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The method of
capturing the carbon dioxide (CO2) from the exhaust of the
combustion process is mainly called Post Combustion Capture. By using an
applicable and appropriate solvent, the CO2 would be assimilated.
The solvent would then be simulated by a change in temperature or pressure and
the CO2 is released due to this occurrence. After the solvent is
discharged, The CO2 is then refined, condensed, and stored.

Presently, a
variation of post-combustion capture technologies is being presented and probed
into. Including chemical absorption, adsorption, membrane separation,
Ca-looping technology, cryogenic fractionation, and so on and so forth.
Although, most of the technologies that has been inspected and analyzed are not
commercially enforced yet due to the low partial pressure of CO2 in
flue gas. Considering the presence of flue gas at atmospheric pressures and the
concentration of CO2, that ranges from 13% to 15%, the means of driving
force for the separation of CO2 is extremely low. Another occurring
problem is the flow rate of flue gas which is usually 5 to 10 times than
streams usually managed in natural gas and chemical industries. 

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The most
applicable and attainable post-combustion technology that’s aforementioned
above, chemical absorption is the only one that is being considered so far. In
spite of the fact that there has been numerous amounts of solvents that’s been
assessed and tested, monoethanolamine or MEA is indubitably the most extended
solvent. In recent years, innumerable research institutes and companies are working
together on operating larger-scale demonstration power plants with chemical
absorption process and significant developments have been made.

However, given
that chemical absorption technology is more developed, its character of being
energy intensive is prompting multitudinous scientists to find and obtain
alternatives. An emerging technology which is known as the Membrane-based
separation is considered to be an extremely promising competitor. In contrast
to chemical absorption process, membrane-based separation does not have
chemical reactions in most cases. Thus having less impact on the environment.
On top of that, the consumption of energy is predicted to be fewer than
chemical absorption technology. 

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