Performance evaluation of a novel CO 2 absorbent: Dimethyl carbonate

Tang, Zhigang; Li, Hongwei; Fei, Weiyang; Chen, Jian; Cui, Jingjie; Guo, Dong; He, Zhimin

doi:10.1016/j.ijggc.2015.11.016

Cited by 17 publications

(16 citation statements)

References 20 publications

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“…Over the last decade, extensive studies focused on (i) screening novel absorbents with a high CO 2 absorption capacity, fast absorption rate, and low CO 2 desorption heat simultaneously, 7,8 and (ii) developing innovative absorption/desorption process with a low CO 2 desorption energy requirement 9 . Besides these endeavors, recovering waste heat from the stripped gas is another promising method to reduce CO 2 desorption heat consumption 10–12 .…”

Section: Introductionmentioning

confidence: 99%

Waste heat recovery from the stripped gas in carbon capture process by membrane technology: Hydrophobic and hydrophilic organic membrane cases

Cui

et al. 2020

Greenhouse Gases

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In this study, hydrophobic polytetrafluoroethylene (PTFE) and hydrophilic polyetheretherketone (PEEK) membranes were used as heat exchangers in rich-split CO 2 capture process to recover the waste heat from the stripped gas (i.e., mixture of water vapor and CO 2 ). Technical feasibilities of these two membrane exchangers were assessed by heat recovery and energy intensity in the monoethanolamine (MEA)-based carbon capture process. The heat recovery of these two membrane exchangers with different pore sizes were then systematically compared under various operating parameters. The underlying mass and heat transfer mechanisms of two membranes were also investigated and compared to figure out the suitable candidate for heat recovery. Additionally, the potential risks of using these membrane exchangers were identified and investigated. Results showed that the PTFE membrane displays a better heat recovery performance than the PEEK membrane with the same pore size. The heat recovery of both PTFE and PEEK membranes first increases to a plateau and then drops slightly with the increased CO 2 -rich solvent flow rate. The heat recovery of PTFE and PEEK membranes decreases with the increased flow rate and water vapor fraction of the inlet stripped gas, MEA temperature, and MEA concentration. Furthermore, the larger pore size results in higher heat recovery for both PTFE and PEEK membranes. PTFE membranes displayed lower MEA transfer flux than PTFE membranes at any rich MEA flow rate as the enhanced MEA transfer from the cold solution to the other side via PEEK membrane pores filled with liquid water. C

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Section: Introductionmentioning

confidence: 99%

Waste heat recovery from the stripped gas in carbon capture process by membrane technology: Hydrophobic and hydrophilic organic membrane cases

Cui

et al. 2020

Greenhouse Gases

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Section: Introductionmentioning

confidence: 99%

“…Therefore, the use of CO 2 as a renewable building block for the design and synthesis of safer and more sustainable chemical products is regarded as a possible way to mitigate the major issue of climate change. [4][5][6][7][8][9][10] CO 2 is a cost effective, non-toxic, and abundant resource that can be used as chemical feedstock in the production of various value-added chemicals such as DMC and other carbonates. However, CO 2 is thermodynamically and chemically stable due to the presence of carbon atoms in the most oxidized form in the CO 2 molecules.…”

Section: Introductionmentioning

confidence: 99%

Comparative thermodynamic analysis of CO₂ based dimethyl carbonate synthesis routes

2020

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The chemical equilibrium analysis of various possible reactions involved in the five CO 2-based routes for the synthesis of dimethyl carbonate (DMC), a green chemical reagent, was performed in the present study. The variation of the molar Gibbs free energy change with temperature for the major reactions of DMC synthesis in all five routes was studied in the specified temperature range of 298.15 K-453.15 K and at both 1 bar and 28 bar pressures (1 bar = 10 5 Pa) to observe the thermodynamic favourability of all routes. To observe the temperature effect, the molar heat capacities for various compounds were estimated in terms of temperature. A second-order group additivity method called the Ruzicka-Domalski method was used to estimate these heat capacity values. The major reactions of DMC synthesis in urea methanolysis, EC transesterification, PC transesterification, and direct CO 2 synthesis routes were compared by investigating the effect of temperature (in the range of 298.15 K-453.15 K) on the chemical equilibrium constants and the equilibrium conversions of methanol at a constant pressure of 28 bar. The one-pot propylene oxide (PO) synthesis route was observed to be better among all the five CO 2 based routes when it was compared with respect to values of the chemical equilibrium constant and equilibrium conversion of methanol at standard conditions. The reliability of the EC transesterification route was found better among all the routes at initial conditions (T = 298.15 K; P = 28 bar). While the urea methanolysis route was found as least favourable at initial conditions.

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“…(2014, 2015) were devoted to the research of the new type of amine-based absorbent, more than 20 kinds of high efficient mixed amine absorbents were developed. Tang et al. (2016) were mainly engaged in thermodynamics and kinetics-related studies of alcamines and mixed absorbent.…”

Section: Introductionmentioning

confidence: 99%

“…Fang et al (2014Fang et al ( , 2015 were devoted to the research of the new type of amine-based absorbent, more than 20 kinds of high efficient mixed amine absorbents were developed. Tang et al (2016) were mainly engaged in thermodynamics and kinetics-related studies of alcamines and mixed absorbent. and have developed a new phase transformation absorbent, where the energy consumed by the latent heat of water in traditional absorbent is saved.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic properties in ternary system of NH₄HCO₃–H₂O–ethanol based on antisolvent method to strengthen crystallization of carbonized ammonia

Feng

Gao

et al. 2018

Adsorption Science & Technology

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One of the main challenges of the ammonia-based CO 2 capture process is how to further reduce the regeneration energy consumption. An antisolvent crystallization method was proposed to strengthen the crystallization process of carbonized ammonia, and heating the crystal products instead of rich solution can greatly reduce renewable energy consumption. The main component of the crystal product was NH 4 HCO 3 analyzed by X-ray diffraction. Therefore, it is very important to study the thermodynamic properties of ammonium bicarbonate in the ternary system of NH 3-H 2 O-ethanol. In this paper, the solubility curves under different temperature and solvent compositions were determined by static method and the mathematical model of solubility was established. The effects of the addition of ammonium carbamate which was produced in the initial stage of the CO 2 absorption process and the addition of ammonia on the solubility in ternary system of NH 4 HCO 3-H 2 O-ethanol were studied. The dissolution heat was also calculated in the end. The research of this article has a guiding significance for the antisolvent method to strengthen the crystallization of carbonized ammonia of ammonia-based carbon capture technology. It is helpful to further strengthen the crystallization process of low carbonized ammonia and improve the crystallization yield.

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Performance evaluation of a novel CO 2 absorbent: Dimethyl carbonate

Cited by 17 publications

References 20 publications

Waste heat recovery from the stripped gas in carbon capture process by membrane technology: Hydrophobic and hydrophilic organic membrane cases

Waste heat recovery from the stripped gas in carbon capture process by membrane technology: Hydrophobic and hydrophilic organic membrane cases

Comparative thermodynamic analysis of CO₂ based dimethyl carbonate synthesis routes

Thermodynamic properties in ternary system of NH₄HCO₃–H₂O–ethanol based on antisolvent method to strengthen crystallization of carbonized ammonia

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Performance evaluation of a novel CO 2 absorbent: Dimethyl carbonate

Cited by 17 publications

References 20 publications

Waste heat recovery from the stripped gas in carbon capture process by membrane technology: Hydrophobic and hydrophilic organic membrane cases

Waste heat recovery from the stripped gas in carbon capture process by membrane technology: Hydrophobic and hydrophilic organic membrane cases

Comparative thermodynamic analysis of CO2 based dimethyl carbonate synthesis routes

Thermodynamic properties in ternary system of NH4HCO3–H2O–ethanol based on antisolvent method to strengthen crystallization of carbonized ammonia

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Product

Resources

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Comparative thermodynamic analysis of CO₂ based dimethyl carbonate synthesis routes

Thermodynamic properties in ternary system of NH₄HCO₃–H₂O–ethanol based on antisolvent method to strengthen crystallization of carbonized ammonia