Carbon dioxide absorption into unpromoted and borate-catalyzed potassium carbonate solutions

CO2 capture with potassium carbonate solutions: A state-of-the-art review

“…They found that the second order kinetic constant based on activity is independent of cation and carbonate concentrations. An expression for the second order kinetic constant of the reaction between CO 2 and hydroxide ion at infinite dilution was obtained for temperature range from 298 to 343 K. Thee et al (2012a) studied the reaction kinetics of CO 2 absorption into un-promoted and boric acid-promoted PC solution, and measured the activation energy under the industrial conditions. They demonstrated the Arrhenius reaction rates for k OH − and k borate .…”

“…77.15050 is contribution factor for CO2 absorption into potassium hydroxide solutionKnuutila et al (2010) ln k OH − = 29.1945 − 5931.4657They used a string of discs device for 5-30 wt% Na2CO3 and 5-50 wt% K2CO3 solutions at temperature up to 343 K Reaction kinetic of sodium and PC solutions in a string of discs apparatusThee et al (2012a) lnk OH − = 26.2566 − 4311 They used a wetted wall column for 30 wt% K2CO3 at temperature 353 K Shen et al (2013b) ln k OH − = 24.4891 − 6666 They used a wetted wall column for 35 wt% K2CO3 at temperature range from 313 to 343 K Ye and Lu (2014b) ln k OH − = 27.1510 − 5.848 They used a stirred tank reactor for 5-40 wt% K2CO3 solutions at 323-353 K with various amino acids. The presented model for k OH − by individual researchers are summarized in…”

Review of solvent based carbon-dioxide capture technologies

“…Therefore, K 2 CO 3 has great commercial potential in capturing CO 2 due to the fact that it is environmentally benign and cost effective. The main challenge associated with K 2 CO 3 capture system is the slow reaction rate of pure K 2 CO 3 solution; however, the use of several promoters which have active N-H group can accelerate the reaction significantly [108][109][110][111][112][113].…”

Process modifications for a hot potassium carbonate‐based CO2capture system: a comparative study

“…Compared to MEA, potassium carbonate offers many benefits including low cost, less energy requirement for solvent regeneration, less toxicity and solvent losses, less prone to degradation (no thermal and oxidative degradation), no formation of heat-stable salts, better resistance to the presences of SO 2 and NOx and the ability to run the absorption process at higher temperatures. [23][24][25][26][27][28][29][30] Despite these findings, literature publications on how process modifications could render K 2 CO 3 -based carbon capture technology more energy efficiently at higher carbon capture efficiency are scarce. However, the existing literature reveals numerous process modifications for post-combustion CO 2 capture systems.…”