I am working on the development of monoethanol amine-based CO2 capture (DAC). I am using 30% MEA solution and bubbling air through the solution. I did not find any reported recycle no. for MEA. Please let me know if anyone knows. Thanks.
RNH2 CO2=RNHCOONH3R
Monoethanolamine (MEA), diethanolamine (DEA) and methyldiethanolamine (MDEA) are the most commonly used amines in scrubbing applications.
The absorption or removal efficiency (η defined in where and are the CO2 concentration expressed as molar fraction at the inlet and outlet, resp.) is a means of expressing the performance of the scrubber. Several authors have erroneously referred to as a solvent property even though two scrubbers using the same solvent could have different absorption efficiencies. Consider η =(y1-y0)y1
Y1= Final CO2 Concentration, in molar fraction
Y0-Initial Concentration, in molar fraction.
Amines are capable of chemical and physical CO2 absorption. according to hennery law of partial pressure.
Factor of absorption
Absorption is directly proportional to pressure and inversely proportional to temperature.
The recycling of amine solutions for CO2 capture is limited due to thermal, oxidative degradation and losses with the off-gas from the absorption and stripping column. You can find literature reporting degradation rates with appropriate keywords (e.g. MEA degradation rate). Minimum losses with the off-gas are defined by the vapor pressure of the amines at the process conditions.
If you want to capture CO2 from the air, just take some agricultural waste.
It contains freshly filtered CO2 from the air.
...or you can take waste paper pulp. We produce a Gigaton each year. All recently filtered CO2 from the air. The problem is not how to get CO2 from the air, because 230GT is extracted annually by nature itself trough growing biomass. The problem is that we humans are so idiots to burn it or ferment it to biogass claiming ''it is renewable'', while putting it back to the atmosphere.