Abstract
Environmentally friendly amino-acid salt solutions are used for the absorption of carbon dioxide from concentrated flue-gas streams via chemical absorption. Process intensification reduces operating and capital costs by combining chemical reactions and separation operations. Here, we present a new process-intensification approach that combines the CO2 capture and the amino-acid regeneration steps into a single process carried out in a slurry three-phase reactor. The absorbed CO2 precipitates as a solid carbonated guanidine compound. The cycle is completed by separation of the solid precipitate to strip the CO2 and regenerate the guanidine compound, while the liquid solution is recycled to the slurry reactor. The process was studied by modifying a model developed by the authors for a gas-liquid bubble column without the presence of the guanidine compound. The guanidine precipitation reaction was accounted for using kinetic parameters calculated by the authors in another study. The proposed model was implemented by modifying an existing computer code used for the simulation of gas-liquid bubble columns. The calculated results showed that the proposed cycle can significantly reduce energy, equipment, and operating costs and can make an important contribution to developing a competitive cost-effective large-scale process for CO2 capture.
Highlights
The effects of climate change can be decreased only by major reductions in anthropogenic CO2 emissions [1,2,3]
Several authors reported the kinetics of CO2 absorption by amino acid salt solutions [9,10,11,12,13]
The breakthrough behavior is produced by significant amino acid consumption and pH decrease at very short times
Summary
The effects of climate change can be decreased only by major reductions in anthropogenic CO2 emissions [1,2,3]. One of the most important industrial processes for carbon dioxide capture is chemical absorption by amines or blends of different amines as absorption solvents ([4,5,6,7,8], among others). The most important shortcomings of the process are the high energy budget required for CO2 stripping [4] and the toxicity of some of the solvents used [7]. Many authors have studied the use of amino acid salt solutions as absorbents for CO2 sequestration [9,10,11,12,13,14,15,16], among others. Several authors reported the kinetics of CO2 absorption by amino acid salt solutions [9,10,11,12,13]. Other researchers studied different processes using different contactors to increase the mass transfer rate between the gas and liquid phases [16,17]
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