A review: Desorption of CO 2 from rich solutions in chemical absorption processes

Li, Tongyan; Keener, Tim C.

doi:10.1016/j.ijggc.2016.05.030

Cited by 71 publications

(73 citation statements)

References 84 publications

(91 reference statements)

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“…However, these methods still require intensive researches to provide a thorough database, ready for further practice . Among these methods, solvent improvement has been studied intensively since (a) lower heat of absorption result in lower Q react and (b) solvent improvement is an independent method, which can co‐operate with heterogeneous catalysis and process optimization. From Keener, massive researches focused on the development of improved solvents with lower reaction energies (Q react ) by blending different amine solutions.…”

Section: Introductionmentioning

confidence: 99%

CO₂ desorption tests of blended monoethanolamine–diethanolamine solutions to discover novel energy efficient solvents

Shi

Zheng

Huang

et al. 2018

Asia-Pacific J Chem Eng

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The CO 2 desorption tests were conducted at 363-378 K for 5.0 mol/L blended monoethanolamine (MEA)-diethanolamine (DEA) solutions to develop the energy efficient solvents with high CO 2 production and low energy consumptions. These desorption tests were performed with a recirculation process for various preloaded, 5 mol/L (4.5 + 0.5 to 0.5 + 4.5) MEA-DEA solutions to find out the optimized solvents with minimum heat duty. Therefore, 1-4 mol/L and 0.5-0.45 mol/L MEA-DEA solvents have larger CO 2 production (nCO 2 ) and lower heat duties (H CO 2 ) than 5 mol/L DEA under similar operation conditions. They have lower heat duty (510 and 538 kJ/mol) than DEA (572 kJ/mol) due to increased CO 2 desorption rates, despite 10% higher heat input (Q Total ) than DEA. Moreover, the critical points were studied as research focus of amine regeneration curves, along with reaction energy calculation. Finally, secondary amines blending minor MEA (<20%) as promotor turned out to be an alternative approach of solvents improvement with low energy requirement.

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Section: Introductionmentioning

confidence: 99%

CO₂ desorption tests of blended monoethanolamine–diethanolamine solutions to discover novel energy efficient solvents

Shi

Zheng

Huang

et al. 2018

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

show abstract

“…Researchers have developed several methods to reduce the part or overall of heat duty. [3,4,[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] Two conventional methods were recommended: solvent improvement and process intensification. [2] For process configuration optimization, a series of approaches have been conducted since 2005, [2,7,8,9] which focused on the utilization of as much external energy as possible.…”

Section: Introductionmentioning

confidence: 99%

Amine regeneration tests on MEA, DEA, and MMEA with respect to cabamate stability analyses

Shi

Zhou

et al. 2017

Can J Chem Eng

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The CO2 desorption analyses of several amines were performed to reveal the behaviour of the amine regeneration process. A typical primary amine (MEA) and two other secondary amines (MMEA and DEA) were selected, in preparation for amine solutions under different concentrations, from 1–7 mol/L. The regeneration curves were generated and plotted to describe the process. It was discovered that the specific CO2 loadings (mol/mol) that distinguish the amine regeneration curves into different regions were the same for the specific amine, despite different concentrations. These points were defined as “turning points” on regeneration curves. The turning points of MEA, MMEA, and DEA are located at CO2 loadings of 0.40 mol/mol, 0.38 mol/mol, and 0.28 mol/mol, respectively. The carbamate stabilities of the three amines were compared with each other based on the slope of regeneration curves at slow region. The amine regeneration tests compared the relative heat duty at the first 2 h: MMEA > MEA > > DEA, which is the same order as carbamate stability.

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“…However, high-energy requirements in the regeneration or CO 2 desorption process is the largest obstacle for preventing its industrial applications 10 . Conventional regenerations of spent solvents are just realized by heating spent solvents above boiling temperatures (100–150 °C).…”

Section: Introductionmentioning

confidence: 99%

TiO(OH)2 – highly effective catalysts for optimizing CO2 desorption kinetics reducing CO2 capture cost: A new pathway

Yao

Toan

Huang

et al. 2017

Sci Rep

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The objective is to find a new pathway for significant reduction in CO2 capture energy consumption. Specifically, nanoporous TiO(OH)2 was used to realize the objective, which was desired as a catalyst to significantly accelerate the decomposition of aqueous NaHCO3, essentially CO2 desorption – the key step of Na2CO3/NaHCO3 based CO2 capture technologies from overall CO2 energy consumption perspective. Effects of several important factors on TiO(OH)2-catalyzed NaHCO3 decomposition were investigated. The quantity of CO2 generated from 0.238 mol/L NaHCO3 at 65 °C with catalyst is ~800% of that generated without the presence of catalyst. When a 12 W vacuum pump was used for carrying the generated CO2 out of reactor, the total amount of CO2 released was improved by ~2,500% under the given experimental conditions. No significant decrease in the catalytic effect of TiO(OH)2 was observed after five cyclic CO2 activated tests. In addition, characterizations with in-situ Fourier transform infrared spectroscopy, thermal gravity analysis and Brunauer-Emmett-Teller of TiO(OH)2 indicate that TiO(OH)2 is quite stable. The discovery in this research could inspire scientists’ interests in starting to focus on a new pathway instead of making huge effort or investment in designing high-capacity but expensive CO2 sorbent for developing practical or cost-effective CO2 technologies.

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A review: Desorption of CO 2 from rich solutions in chemical absorption processes

Cited by 71 publications

References 84 publications

CO₂ desorption tests of blended monoethanolamine–diethanolamine solutions to discover novel energy efficient solvents

CO₂ desorption tests of blended monoethanolamine–diethanolamine solutions to discover novel energy efficient solvents

Amine regeneration tests on MEA, DEA, and MMEA with respect to cabamate stability analyses

TiO(OH)2 – highly effective catalysts for optimizing CO2 desorption kinetics reducing CO2 capture cost: A new pathway

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A review: Desorption of CO 2 from rich solutions in chemical absorption processes

Cited by 71 publications

References 84 publications

CO2 desorption tests of blended monoethanolamine–diethanolamine solutions to discover novel energy efficient solvents

CO2 desorption tests of blended monoethanolamine–diethanolamine solutions to discover novel energy efficient solvents

Amine regeneration tests on MEA, DEA, and MMEA with respect to cabamate stability analyses

TiO(OH)2 – highly effective catalysts for optimizing CO2 desorption kinetics reducing CO2 capture cost: A new pathway

Contact Info

Product

Resources

About

CO₂ desorption tests of blended monoethanolamine–diethanolamine solutions to discover novel energy efficient solvents

CO₂ desorption tests of blended monoethanolamine–diethanolamine solutions to discover novel energy efficient solvents