CO2 Capture and Crystallization of Ammonia Bicarbonate in a Lab-Scale Scrubber

Chen, Pao Chi; Yu, Shun Chao

doi:10.3390/cryst8010039

Cited by 13 publications

(10 citation statements)

References 27 publications

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“…In addition, the parameter importance analysis shows γ > pH > T, indicating that the liquid gas contact is significant for CO 2 loading. For the sake of caparison, two solvents, MEA [35] and aqueous ammonia [36], were used in the bubble-column scrubbers for CO 2 capture, and they are also exhibited Figure 7. It was found that most of the data falls in between the error range.…”

Section: Loading Of Co 2 At the Final Stagementioning

confidence: 99%

“…This could be done by increasing the pH of the solution. In addition, the K G a values obtained in the two solvents, MEA [35] and aqueous ammonia [36], which were used in the bubble-column scrubbers for CO 2 absorption, were shown in the same figure for comparison. It was found that the reported data for the two solvents were close to that obtained in this work.…”

Section: Overall Mass-transfer Coefficientmentioning

confidence: 99%

“…However, some parameters, such as the gas-flow rate, liquid-flow rate, solution temperature, and the pH of the solution have been found to be key factors affecting the absorption of CO 2 . Because of the importance of mass transfer in a bubble-column, some papers have studied the effects of the process parameters on the mass transfer coefficients [31][32][33][34][35][36]. The reported values were in the range of 0.01-0.888, depending on the conditions.…”

Section: Introductionmentioning

confidence: 99%

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Optimization in the Absorption and Desorption of CO2 Using Sodium Glycinate Solution

Chen

Lin

2018

Applied Sciences

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This study used sodium glycinate as an absorbent to absorb CO2 in the bubble column scrubber under constant pH and temperature environments to obtain the operating range, CO2 loading, and mass transfer coefficient. For efficient experimentation, the Taguchi method is used for the experimental design. The process parameters are the pH, gas flow rate (Qg), liquid temperature (T), and absorbent concentration (CL). The effects of the parameters on the absorption efficiency, absorption rate, overall mass transfer coefficient, gas–liquid molar flow rate ratio, CO2 loading, and absorption factor are to be explored. The optimum operating conditions and the order of parameter importance are obtained using the signal/noise (S/N) ratio analysis, and the optimum operating conditions are further verified. The verification of the optimum values was also carried out. The order of parameter importance is pH > CL > Qg > T. Evidence in the 13CNMR (Carbon 13 Nuclear Magnetic Resonance) spectra shows that the pH value has an effect on the solution composition, which affects both the absorption efficiency and mass transfer coefficient. There are 18 experiments for regeneration, where the operating temperature is 100–120 °C. The heat of regeneration was measured according to the thermodynamic data. The CO2 loading, the overall mass transfer, and the heats of regeneration correlation are also discussed in this work. Finally, an operating policy for the CO2 absorption process was confirmed.

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Section: Loading Of Co 2 At the Final Stagementioning

confidence: 99%

Section: Overall Mass-transfer Coefficientmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization in the Absorption and Desorption of CO2 Using Sodium Glycinate Solution

Chen

Lin

2018

Applied Sciences

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“…MEA exhibits excellent absorption efficiency, therefore, it has been adopted in several studies. In the previous studies, to understand the relationship between absorption and crystallization in this system, the quasi-steady operation and shell balance were adopted to obtain the equation of absorption rate, and a two-film model was used to describe the mass transfer of CO 2 in the absorption solvent to determine the overall mass transfer coefficient [16,23]. Hence, the results of this study were compared with those of the previous studies in terms of the above-mentioned theory to understand the commercial value of this process.…”

Section: Introductionmentioning

confidence: 99%

CO2 Capture in A Bubble-Column Scrubber Using MEA/CaCl2/H2O Solution—Absorption and Precipitation

Chen

Zhuo

2020

Crystals

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This study used the solvent monoethylamine (MEA)/CaCl2/H2O to investigate CO2 absorption and CaCO3 crystallization in a bubble column scrubber. The variables explored were pH, gas flow rate, gas concentration, the liquid flow rate of the solution to absorb CO2, and CaCO3 crystallization. Under a continuous mode, the solution of CaCl2 was fed continuously, and the pH dropped after CO2 absorption. To maintain the set pH value, there was an automatic input of the MEA solvent into the bubble column. In addition to maintaining the pH, the solution could also absorb CO2 and produce CaCO3 crystals, which served two purposes. The results showed that there were mainly vaterite crystals. At different pH values, the lower the pH, the higher the precipitation rate of vaterite (Fp), and vice versa. However, under different gas flow rates, the Fp decreased as the pH value increased. Additionally, the process variables also affected the absorption rate (RA) and the overall mass-transfer coefficient (KGa) generally increased with increasing pH, gas concentration, and gas flow rate. However, it slowed down under operating conditions at high pH and high gas flow rate. Finally, correlation equations for RA, KGa, and Fp were also obtained and discussed in the study.

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“…In the second paper, Chen [7] proposed a CO 2 capture system the efficiency of which was experimentally determined. The carbon dioxide was converted into ammonia bicarbonate using aqueous ammonia.…”

mentioning

confidence: 99%