Liquid-solid phase-change absorption of acidic gas by polyamine in nonaqueous organic solvent

Zhao, Wenbo; Zhao, Qian; Zhang, Zheng; Lü, Jiaju; Chen, Rui; Chen, Yuan; Chen, Jian

doi:10.1016/j.fuel.2017.07.081

Cited by 47 publications

(30 citation statements)

References 37 publications

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“…48 However, the second peak weight loss rates nearly 120 °C was lower than that of PZ-carbamate in the reported work (130 °C), 19 indicating complex products in the ternary systems which reduced the decomposition temperature. 21 Finally, the solid samples were completely decomposed. After saturated absorption, the solid phase of AMP/PZ/DME saturated solution was separated and regenerated after thermal desorption.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Lean CO 2 in the bulk solution enhances the solubility of CO 2 and the absorption rate, leading to improvement of absorption capacity of the biphasic solvent. 21 Kinetics Analysis. The kinetics analysis of the absorption process provides a theoretical basis for equipment design in industrial applications.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…19,20 To some extent, the solid−liquid biphasic solvent is useful to deal with the problems, for which the absorption products will continuously precipitate and separate from the solution to facilitate the rapid reaction. According to Le Chatelier's principle, 21 the CO 2 absorption equilibrium can be shifted by removing one product from the reaction, leading to the improvement of absorption capacity. Alivand et al 22 reported a solid−liquid phase change absorbent comprised of potassium glycinate (GlyK)/N,N-dimethylformamide (DMF)/H 2 O, and its heat duty was reduced by 59.1% compared to the GlyK aqueous solvent.…”

Section: ■ Introductionmentioning

confidence: 99%

“…33,34 In the present work, a novel solid−liquid nonaqueous solution is proposed for CO 2 capture, which will not only feature the advantage of the nonaqueous solution but also that of biphasic solvent and is expected to alleviate the above shortcomings. Combined with the favorable regeneration performance of AMP 35,36 and fast reaction rate of PZ, 21,37 the amine blend of AMP and PZ ensures excellent performance on CO 2 capture. The organic solvent dipropylene glycol dimethyl ether (DME) with a high boiling point and low viscosity is serviced as the solvent and phase splitter, which is considering as an environmentally friendly solvent for nonhazardous in the list of air pollution by the United States and the European Union.…”

Section: ■ Introductionmentioning

confidence: 99%

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An Efficient Solid–Liquid Biphasic Solvent for CO₂ Capture: Crystalline Powder Product and Low Heat Duty

Chen

Jing

et al. 2020

ACS Sustainable Chem. Eng.

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A nonaqueous, phase-change absorbent of 2-amino-2methyl-1-propanol (AMP)/piperazine (PZ) and environmentally friendly solvent dipropylene glycol dimethyl ether (DME) fixes a number of issues suffered by a solid−liquid biphasic solvent, such as high viscosity of the saturated solution and difficult separation and regeneration of the viscous solid. The solid phase occupies 43% of the total volume while attributes about 94% of the total loading (0.87 mol mol −1 ) of the solution. Beside the formation of AMP-carbamate and PZ-carbamate according to zwitterions mechanism, the coupling products of AMP/PZ-carbamate are also found in the crystal, which helps to reduce the desorption temperature during the regeneration. Because of low solubility, self-aggregation, and high lattice energy in DME, the CO 2 products precipitate and form a white crystalline powder in the lower phase of the solution. Meanwhile, the solid precipitation helps the bulk solution to keep a lower partial pressure and higher diffusivity of CO 2 , conforming a perfect performance of CO 2 capture into the biphasic solvent. The regeneration heat duty of the solvent (1.61 GJ t −1 CO 2 ) was approximately 57% less than that of the benchmark monoethanolamine (MEA) because of its perfect performance on CO 2 capture, such as high absorption loading, high regeneration efficiency, and low amount of rich phase required for regeneration. The novel absorbent has a great potential for green and sustainable CO 2 capture.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Efficient Solid–Liquid Biphasic Solvent for CO₂ Capture: Crystalline Powder Product and Low Heat Duty

Chen

Jing

et al. 2020

ACS Sustainable Chem. Eng.

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“…Due to the formation of solid precipitates, the CO 2 absorption performance can be enhanced by removing CO 2 -loaded products to shift the equilibrium of CO 2 absorption. Some blend systems have been recently reported, such as amine blends in nonaqueous solvents of ethylene glycol or 1,2-propandiol with either methanol or ethanol; 26 triethylenetetramine/ethanol blend; 27 triethylenetetramine/polyethylene glycol blend; 28 linear polyamines in ethanol, diethylene glycol dimethyl ether, N-methylpyrrolidone, or dimethyl carbonate; 29,30 piperazine/N,Ndimethylformamide solution; 31 and potassium prolinate/ ethanol/water solution. 32 Among the above-mentioned biphasic systems, the main reactive compositions are amines and polyamines.…”

Section: ■ Introductionmentioning

confidence: 99%

Low-Energy-Consumption CO₂ Capture by Liquid–Solid Phase Change Absorption Using Water-Lean Blends of Amino Acid Salts and 2-Alkoxyethanols

Guo

Shen

2020

ACS Sustainable Chem. Eng.

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Solvent regeneration for the conventional aqueous amine-based CO2 capture is very energy intensive. Development of phase-changing absorbents is an attractive solution for low energy consumption. In this work, a novel water-lean amino acid salt-based biphasic absorbent was proposed to improve CO2 capture performance and energy efficiency. Potassium prolinate (ProK) and potassium sarcosinate (SarK) with a secondary amino group were used as active components, and 2-alkoxyethanols with low volatility, low specific heat, and low viscosity were used as physical antisolvents and triggered the formation of solid phase during CO2 absorption. CO2 absorption and desorption characteristics in these systems and continuous capture cycles were investigated under ambient pressure. Relative regeneration energy consumption for solvent regeneration was also evaluated in comparison with the benchmark aqueous MEA. Phase change behavior and partition of CO2 absorbed in liquid and solid phases were characterized, and the product species in CO2-rich solid phase were identified by 13C NMR and XRD. Results demonstrated that using weak polar solvents, such as 2-methoxyethanol (EGME) and 2-ethoxyethanol (EGEE), can be favorable for the formation of solid precipitates in these systems investigated. Solid slurry with CO2 loading of 2.5–3.5 mol kg–1 can captured about 50–80% of the absorbed CO2. Ionic products such as bicarbonate and protonated amino acid salt were proved to be the main compositions in the solid precipitate. In comparison with aqueous 5.0 M MEA, the 3.0 M ProK/EGME system showed comparable cyclic capacity (about 0.80 mol kg–1) and a little higher desorption efficiency. Surprisingly, about 40–50% reduction of regeneration energy indicates that water-lean phase change ProK/EGME absorbent has a great potential for advanced CO2 capture technology.

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Phase-change absorption for CO2 capture: Chemical solvents and processes

Olyaei

Hafizi

2020

Advances in Carbon Capture

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Liquid-solid phase-change absorption of acidic gas by polyamine in nonaqueous organic solvent

Cited by 47 publications

References 37 publications

An Efficient Solid–Liquid Biphasic Solvent for CO₂ Capture: Crystalline Powder Product and Low Heat Duty

An Efficient Solid–Liquid Biphasic Solvent for CO₂ Capture: Crystalline Powder Product and Low Heat Duty

Low-Energy-Consumption CO₂ Capture by Liquid–Solid Phase Change Absorption Using Water-Lean Blends of Amino Acid Salts and 2-Alkoxyethanols

Phase-change absorption for CO2 capture: Chemical solvents and processes

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Liquid-solid phase-change absorption of acidic gas by polyamine in nonaqueous organic solvent

Cited by 47 publications

References 37 publications

An Efficient Solid–Liquid Biphasic Solvent for CO2 Capture: Crystalline Powder Product and Low Heat Duty

An Efficient Solid–Liquid Biphasic Solvent for CO2 Capture: Crystalline Powder Product and Low Heat Duty

Low-Energy-Consumption CO2 Capture by Liquid–Solid Phase Change Absorption Using Water-Lean Blends of Amino Acid Salts and 2-Alkoxyethanols

Phase-change absorption for CO2 capture: Chemical solvents and processes

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An Efficient Solid–Liquid Biphasic Solvent for CO₂ Capture: Crystalline Powder Product and Low Heat Duty

An Efficient Solid–Liquid Biphasic Solvent for CO₂ Capture: Crystalline Powder Product and Low Heat Duty

Low-Energy-Consumption CO₂ Capture by Liquid–Solid Phase Change Absorption Using Water-Lean Blends of Amino Acid Salts and 2-Alkoxyethanols