Process modifications for a hot potassium carbonate‐based CO<sub>2</sub>capture system: a comparative study

Ayittey, Foster Kofi; Obek, Christine Ann; Saptoro, Agus; Perumal, Kumar; Wong, Mee Kee

doi:10.1002/ghg.1953

Cited by 18 publications

(9 citation statements)

References 47 publications

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“…This finding was also confirmed by the validated results. This result can be explained by the so-called hot potassium carbonate (K 2 CO 3 ) process (hot pot process), according to which K 2 CO 3 is mainly used to remove large amounts of CO 2 from ammonia plants [24][25][26] via the reaction described in Equation ( 6) [25]. In this process, the entire system is operated at high temperatures (110-116 • C) to increase the solubility of K 2 CO 3 .…”

Section: Experimental Validation Of the Predicted Optimal Responsesmentioning

confidence: 99%

KOH-Based Modified Solvay Process for Removing Na Ions from High Salinity Reject Brine at High Temperatures

et al. 2021

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The traditional Solvay process and other modifications that are based on different types of alkaline material and waste promise to be effective in the reduction of reject brine salinity and the capture of CO2. These processes, however, require low temperatures (10–20 °C) to increase the solubility of CO2 and enhance the precipitation of metallic salts, while reject brine is usually discharged from desalination plants at relatively high temperatures (40–55 °C). A modified Solvay process based on potassium hydroxide (KOH) has emerged as a promising technique for simultaneously capturing carbon dioxide (CO2) and reducing ions from reject brine in a combined reaction. In this study, the ability of the KOH-based Solvay process to reduce brine salinity at relatively high temperatures was investigated. The impact of different operating conditions, including pressure, KOH concentration, temperature, and CO2 gas flowrate, on CO2 uptake and ion removal was investigated and optimized. The optimization was performed using the response surface methodology based on a central composite design. A CO2 uptake of 0.50 g CO2/g KOH and maximum removal rates of sodium (Na+), chloride (Cl−), calcium (Ca2+), and magnesium (Mg2+) of 45.6%, 29.8%, 100%, and 91.2%, respectively, were obtained at a gauge pressure, gas flowrate, and KOH concentration of 2 bar, 776 mL/min, and 30 g/L, respectively, and at high temperature of 50 °C. These results confirm the effectiveness of the process in salinity reduction at a relatively high temperature that is near the actual reject brine temperature without prior cooling. The structural and chemical characteristics of the produced solids were investigated, confirming the presence of valuable products such as sodium bicarbonate (NaHCO3), potassium bicarbonate (KHCO3) and potassium chloride (KCl).

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Section: Experimental Validation Of the Predicted Optimal Responsesmentioning

confidence: 99%

KOH-Based Modified Solvay Process for Removing Na Ions from High Salinity Reject Brine at High Temperatures

et al. 2021

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“…To improve the performance of HPC-CA, the operating pressure of the absorber was changed. Following [4], for HPC, reboiler duty can be reduced by the formation of the sesquihydrate potassium carbonate crystal (K2CO3.1.5H2O) in the HPC-CA. The formation of this crystal only occurs when the absorber is operated at high pressure (10-20 bar) and high temperature (382-488K).…”

Section: Solvent (30wt% K2co3)mentioning

confidence: 99%

“…For post combustion capture, chemical absorption is the only commercialized technology for CO2 capture [2,3]. In order to reduce the energy penalty, different solvents have been proposed for chemical absorption, of which Monoethanolamine (MEA) and hot potassium carbonate (HPC) have received most of attention [4].…”

Section: Introductionmentioning

confidence: 99%

Differences on Capturing CO2 from the Combustion of Biomass and Coal by using Chemical Absorption

Nookuea,

Dong,

Gustafsson

et al. 2021

Preprint

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Even though all capture technologies developed for capturing CO2 from the utilization of fossil fuels can be applied to capture CO2 from the utilization of biomass, due to the obvious different properties, the performance can also be quite different. This work investigates the differences when using chemical absorption to capture CO2 from the combustion of recycled woods and coal, in order to provide suggestions on the integration of CO2 capture in the utilization of bioenergy and promote the application of bioenergy with CO2 capture and storage (BECCS). Two solvents, Monoethanolamine (MEA) and hot potassium carbonate (HPC), have been included. The results show that the flue gas (FG) from the combustion of recycled wood (RW) has a higher CO2 content, but lower O2, SOx and NOx content compared to the coal fired FG. In comparison to the coal fired FG, capturing CO2 from the RW fired FG requires less energy for both solvents, due to its higher CO2 content. The estimated oxidative and acid gas degradations are higher for FFCCS compared to BECCS, due to the higher O2, SOx and NOx contents in coal fired FG compared to those in the RW fired FG. For HPC process, FG compression work account for the largest part of the total energy consumption. Even though, the reboiler duty of the HPC process is lower than that of the MEA process, the total energy penalty is higher.

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“…Although extensive works on these combined modifications exist in literature, studies on combined LVC and RSP are unavailable. As standalone process configurations, these modifications have been acknowledged to be very promising technologies in saving energy consumption in MEA‐based carbon capture 26,27,29,46,47 . To analyse the influence of a combined LVC and RSP on the reboiler duty of MEA‐based PCC system, this simulation‐based explored in detail the optimum energy minimization potentials of standalone LVC and RSP modifications and also their impact in a combined model.…”

Section: Introductionmentioning

confidence: 99%

Energy‐saving process configurations for monoethanolamine‐based CO₂ capture system

Ayittey

Saptoro

Wong

2020

Asia-Pacific J Chem Eng

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It is evident from several researches that combining a couple of process modifications is effective in reducing reboiler duty in the chemical absorption‐based carbon capture process. Although extensive works on these combined modifications exist in literature, studies on combined lean vapour compression (LVC) and rich solvent preheating (RSP) are unavailable, despite their potentials as promising energy‐saving technologies. This simulation‐based study therefore explored standalone and combined process modifications capable of minimizing reboiler duty in monoethanolamine (MEA)‐based postcombustion CO2 capture system. Using the electrolyte nonrandom two‐liquid (ELECNRTL) property method in Aspen Plus®, a rigorous rate‐based simulation was performed and validated for conventional MEA‐based capture system. Subsequently, three main process modifications, namely, LVC, RSP and combined LVC and RSP, were investigated to evaluate their impact on energy consumption level in the stripping column. The modifications were able to reduce the total equivalent electrical penalty on the power plant by 12.94%, 5.24% and 14.48%, respectively. The results from this study demonstrate that a detailed optimization of the combined LVC and RSP process configuration could achieve considerable energy saving in MEA‐based capture systems.

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

Cited by 18 publications

References 47 publications

KOH-Based Modified Solvay Process for Removing Na Ions from High Salinity Reject Brine at High Temperatures

KOH-Based Modified Solvay Process for Removing Na Ions from High Salinity Reject Brine at High Temperatures

Differences on Capturing CO2 from the Combustion of Biomass and Coal by using Chemical Absorption

Energy‐saving process configurations for monoethanolamine‐based CO₂ capture system

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

Cited by 18 publications

References 47 publications

KOH-Based Modified Solvay Process for Removing Na Ions from High Salinity Reject Brine at High Temperatures

KOH-Based Modified Solvay Process for Removing Na Ions from High Salinity Reject Brine at High Temperatures

Differences on Capturing CO2 from the Combustion of Biomass and Coal by using Chemical Absorption

Energy‐saving process configurations for monoethanolamine‐based CO2 capture system

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Product

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

Energy‐saving process configurations for monoethanolamine‐based CO₂ capture system