Comparative microfluidic screening of amino acid salt solutions for post-combustion CO2 capture

•We measure the CO2 absorption capacity of amino acid salts in a microfluidic device.•CO2 loading of absorbent solutions can be measured with 50% higher than MEA. The salts of glycine, and taurine exhibited similar absorption capacity to MEA, and the salt of proline exhibited the lowest absorption c...

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Bibliographic Details
Published in:International journal of greenhouse gas control 2015-12, Vol.43, p.189-197
Main Authors: Hallenbeck, Alexander P., Egbebi, Adefemi, Resnik, Kevin P., Hopkinson, David, Anna, Shelley L., Kitchin, John R.
Format: Article
Language:English
Subjects:
Lysine
Microfluidic
Raman
Segmented flow
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Summary:•We measure the CO2 absorption capacity of amino acid salts in a microfluidic device.•CO2 loading of absorbent solutions can be measured with 50% higher than MEA. The salts of glycine, and taurine exhibited similar absorption capacity to MEA, and the salt of proline exhibited the lowest absorption capacity. The trend in absorption capacities of the potassium salt of lysine and MEA was also observed in a set of breakthrough CSTR experiments. Raman spectroscopy was used to analyze the absorbent solutions before exposure to CO2 as well as the reactor effluent. Spectral features of carbamate, carbonate, and bicarbonate were identified in the effluent spectra. The effectiveness of the microfluidic reactor as a solvent volume and time efficient screening tool is demonstrated. The results suggest further work should be done to evaluate the efficacy of the alkali salt of lysine as a post-combustion CO2 capture absorbent as it has potential to match or possibly improve upon the CO2 loading of MEA while offering advantages such as low toxicity and lower volatility.
ISSN:1750-5836
1878-0148
DOI:10.1016/j.ijggc.2015.10.026