Kinetic behavior of potassium bicarbonate crystallization in a carbonate-based CO2 absorption process

Ye, Qing; Wang, Xinlei; Lu, Yongqi

doi:10.1016/j.cherd.2014.06.012

Cited by 17 publications

(18 citation statements)

References 44 publications

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“…In order to describe the rates of crystal growth and nucleation and to predict the mean crystal size, a three parameter, size dependent crystal growth model was proposed. The process has the higher CO 2 loading, and can be operated at higher pressures which consequently decrease the required water evaporation and work for CO 2 compression in the stripper (Ye et al, 2015).…”

Section: Stripper Columnmentioning

confidence: 99%

“…The lean solvent loading and stripper pressure had the key roles on the power output of the power station and the CO 2 removal amount. In another study, by cooling of CO 2 -rich potassium carbonate-bicarbonate solutions the potassium bicarbonate was crystallized and a bicarbonate suspension (slurry) was obtained (Ye et al, 2015). The slurry was used to strip the CO 2 at high temperatures.…”

Section: Stripper Columnmentioning

confidence: 99%

See 1 more Smart Citation

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

Borhani

Azarpour

Akbari

et al. 2015

International Journal of Greenhouse Gas Control

195

105

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Section: Stripper Columnmentioning

confidence: 99%

Section: Stripper Columnmentioning

confidence: 99%

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

Borhani

Azarpour

Akbari

et al. 2015

International Journal of Greenhouse Gas Control

195

105

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“…Secondly, MEA suffers oxidative and thermal degradations under the high temperature associated with typical post‐combustion capture conditions. This requires frequent replenishment of the solvent with a fresh solution, thereby increasing the quantity of solvent usage and cost . Finally, the high carbon footprint associated with the mass production of this solvent makes it unattractive for large‐scale applications in post‐combustion capture processes .…”

Section: Introductionmentioning

confidence: 99%

“…This requires frequent replenishment of the solvent with a fresh solution, thereby increasing the quantity of solvent usage and cost. [17][18][19][20][21] Finally, the high carbon footprint associated with the mass production of this solvent makes it unattractive for large-scale applications in post-combustion capture processes. 22 For these reasons, a significant amount of research is being directed towards two main areas: developing lower cost and more environmentally friendly solvents, and designing various process modifications to minimise the energy penalties.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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Chemical absorption using hot potassium carbonate (K2CO3) is believed to be a more energy‐efficient post‐combustion CO2 capture technology as compared to conventional amine‐based absorption processes. That notwithstanding, literature information on how process modifications could render this technology more appealing are limited. In this study, seven different modified process configurations have been investigated to observe their impacts on the system performances of a typical hot K2CO3‐based capture system. The results demonstrate that flue gas precooling is capable of improving the carbon removal level in the K2CO3‐based capture system by 11.46% over the base case value. This was achieved by precooling the flue gas stream from 110 to 70°C before feeding into the absorber column. Other modified process systems such as the rich solvent pre‐heating and lean vapour compression were equally observed to decrease the specific stripper reboiler duty by 24.28% and 21.38%, respectively. The findings from this research prove that process modifications are capable of enhancing the system performances of the hot K2CO3‐based post‐combustion CO2 capture technology. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

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“…Therefore, the investigation of the crystallization behavior in K 2 CO 3 –KHCO 3 –H 2 O ternary solvent system is important. Ye et al from the University of Illinois at Urbana–Champaign has studied the crystallization kinetics of KHCO 3 in concentrated K 2 CO 3 systems in a mixed-suspension, mixed-product removal (MSMPR) reactor, which was a continuous crystallization process at a laboratory scale. Compared to the continuous crystallization process, batch crystallization is regarded as a relatively simple unit operation, which can be flexible and cost-effective to retrofit and integrate into the existing process, and remains of high interest .…”

Section: Introductionmentioning

confidence: 99%

Precipitating Characteristics of Potassium Bicarbonate Using Concentrated Potassium Carbonate Solvent for Carbon Dioxide Capture. Part 2: Crystal Growth

Tao

et al. 2017

Ind. Eng. Chem. Res.

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Crystallization kinetics of potassium bicarbonate in the potassium carbonate (K 2 CO 3 )−potassium bicarbonate (KHCO 3 )−water (H 2 O) ternary solvent system were estimated using focused beam reflectance measurement (FBRM) in unseeded batch cooling experiments. Two groups of experiments including apparent K 2 CO 3 concentrations of 35 and 40 wt %, both with 0.4 loading, at different constant cooling rates were conducted. KHCO 3 was the only precipitate in the ternary system. The concentration of KHCO 3 measured by autotitration and chord length distribution collected from FBRM were used to estimate the parameters required for the primary nucleation, secondary nucleation, and growth rate models through mass balance, population balance using the method of moments, and least-squares minimization in MATLAB. The solubility of the ternary solvent system was successfully predicted using the regressed electrolyte nonrandom twoliquids (ENRTL) activity model in Aspen Plus. The crystallization of KHCO 3 was impacted by KHCO 3 supersaturation and K 2 CO 3 concentration. Primary nucleation was found to dominate the system including both homogeneous and heterogeneous nucleation, whereas secondary nucleation was inhibited to a great extent. The model developed was able to predict the average particle size within 20%, the results obtained from the model were consistent with the conclusion that primary nucleation dominates the K 2 CO 3 −KHCO 3 − H 2 O solvent system.

show abstract

Kinetic behavior of potassium bicarbonate crystallization in a carbonate-based CO2 absorption process

Cited by 17 publications

References 44 publications

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

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

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

Precipitating Characteristics of Potassium Bicarbonate Using Concentrated Potassium Carbonate Solvent for Carbon Dioxide Capture. Part 2: Crystal Growth

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Kinetic behavior of potassium bicarbonate crystallization in a carbonate-based CO2 absorption process

Cited by 17 publications

References 44 publications

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

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

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

Precipitating Characteristics of Potassium Bicarbonate Using Concentrated Potassium Carbonate Solvent for Carbon Dioxide Capture. Part 2: Crystal Growth

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Product

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