Nonaqueous MEA/PEG200 Absorbent with High Efficiency and Low Energy Consumption for CO<sub>2</sub> Capture

Tian, Wen; Ma, Kui; Ji, Junyi; Tang, Siyang; Zhong, Shan; Liu, Changjun; Yue, Hairong; Liang, Bin

doi:10.1021/acs.iecr.0c05294

Cited by 31 publications

(18 citation statements)

References 37 publications

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“…When the concentration of water in the system increases (the salt concentration decreases), some unexpected products may be produced, such as bicarbonate or little tricarbonate. These unexpected products may lead to boundary errors in the system. , The outlier systems, Nos. 85 and 89 , are abnormal at a low concentration.…”

Section: Resultsmentioning

confidence: 99%

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Phase Splitting Rules of the Primary/Secondary Amine–Tertiary Amine Systems: Experimental Rapid Screening and Corrected Quasi-Activity Coefficient Model

Wang

et al. 2022

Ind. Eng. Chem. Res.

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Several phase splitting systems have shown potential in reducing regeneration energy consumption for large-scale CO 2 capture in the last decade. The development of new phase splitting systems currently depends on experimental screening. In this work, 90 sets of primary/secondary amine−tertiary amine anhydrous systems and 160 sets of primary/secondary amine−tertiary amine− water systems were used to investigate the phase splitting rules at the molecular level. The results show that the phase splitting behavior of the anhydrous system is directly affected by the carbamate solubility in the tertiary amine. The potential phase splitting system has a tertiary amine with proper lipophilicity. Among the aqueous systems, two different phase splitting zones were recognized: the salting-out effect zone with a lower amine log P and the cosolvent effect zone with a higher amine log P. Several thermotropic phase splitting systems are located at the edge of these two zones. The tertiary amine with more tert-amine groups and less hydroxyl groups would facilitate phase splitting. The primary/secondary amine with hydroxyl groups on the straight chain would facilitate phase splitting. A new parameter describing the primary amine/secondary amine as a nonelectrolyte is introduced to develop a new quasi-activity coefficient of the chemical−chemical aqueous system. This quasi-activity coefficient is applicable to the mono-or polyamine systems with different material ratios.

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Section: Resultsmentioning

confidence: 99%

“…These unexpected products may lead to boundary errors in the system. 24,40 The outlier systems, Nos. 85 and 89, are abnormal at a low concentration.…”

Section: Resultsmentioning

confidence: 99%

Phase Splitting Rules of the Primary/Secondary Amine–Tertiary Amine Systems: Experimental Rapid Screening and Corrected Quasi-Activity Coefficient Model

Wang

et al. 2022

Ind. Eng. Chem. Res.

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“…Chen et al 18 . and Tian et al 19 . studied the performance of 20 wt% [DETAH]Br and 0.5–5.0 M MEA in PEG200, respectively, indicating that nonaqueous absorbent has lower regeneration temperature and excellent corrosion‐resistance.…”

Section: Introductionmentioning

confidence: 99%

“…15,16 For example, Bougie et al 17 studied the nonaqueous MEA solutions (20-70 wt%) in a mixture of ethylene glycol and 1-propanol (EG/PrOH), diethylene glycol monoethyl ether (DEGMEE), and N-methylformamide (NMF), and the 20 wt% MEA/DEGMEE solutions resulted in good CO 2 cyclic capacities and the lowest energy consumption, which was 78% lower than the traditional 30 wt% MEA aqueous solution. Chen et al 18 and Tian et al 19 studied the performance of 20 wt% [DETAH]Br and 0.5-5.0 M MEA in PEG200, respectively, indicating that nonaqueous absorbent has lower regeneration temperature and excellent corrosion-resistance. Furthermore, many studies on phase-change absorbents have been reported.…”

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CO₂ absorption and microwave regeneration with high‐concentration TETA nonaqueous absorbents

et al. 2022

Greenhouse Gases

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While nonaqueous organic‐amine absorbents have great potential in reducing energy consumption of CO2 capture, their absorption/desorption behaviors are still poorly understood when high‐concentration polyamines are used. On the other hand, large scale CO2 capture demands the use of high‐concentration polyamines absorbents. Therefore, we investigated the absorption and microwave regeneration behavior of high‐concentration triethylenetetramine (TETA) in three typical organic solvents, including polyethylene glycol 200 (PEG200), diethylene glycol (DEG), and ethylene glycol (EG). The results showed that high‐concentration TETA nonaqueous absorbents demonstrate advantages in absorption rate and regeneration energy consumption. The average absorption rate of 2.0 and 5.0 mol/L TETA/EG was 2.84 and 4.70 times that of 0.6 mol/L, respectively. The energy consumption of TETA/EG and TETA/DEG decreased by 29.4 and 25.6% as the concentration increased from 0.6 to 5.0 mol/L. In addition, the high‐concentration TETA/PEG200 absorbent demonstrated observable tolerance for water vapor, which usually exists in flue gas. Results also showed that microwave regeneration was superior to conventional conduction heating especially when high‐concentration TETA/PEG200 absorbent were used. The energy consumption of microwave regeneration of the absorbent with a concentration of 0.6, 2.0, and 5.0 mol/L was reduced by 65.9, 81.2, and 86.0%, respectively when compared with conduction heating. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.

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“…Water-lean absorbents have emerged in response to the calling for substantial improvement of the aqueous approaches, which could render a viable method to circumvent the high parasitic energy loading because of their relatively lower heat of absorption as well as reduced reversal temperature. , Given the absence of the mass water diluent, equipment corrosion would also be relieved, along with enhancement of gravimetric capacity. To date, a variety of liquid absorbents that could operate under the nonaqueous condition have been devised and applied to CO 2 capture in the bench scale, examples of which are ionic liquids, − deep eutectic solvents, − siloxylated- and silylamines, − alkanolguanidines, − single-component amines, − and their organic solutions. − These absorbents would sustain in the liquid state before and after incorporation of CO 2 and could be thermally regenerated with fast kinetics at mild temperatures rather than at temperatures of 120 °C or above in the case of aqueous alkanolamines. Nevertheless, the industrial application of water-lean systems still has an intrinsic drawback to overcome, that is, the exponential increase of operating viscosity along with CO 2 uptake, which is usually several orders of magnitude larger than that of 30 wt % MEA solution and results in both inefficient internal mass transfer (deterioration of absorption and regeneration) and poor transportation in pipeline networks.…”

Section: Introductionmentioning

confidence: 99%

Alkoxy-Functionalized Amines as Single-Component Water-Lean CO₂ Absorbents with High Efficiency: The Benefit of Stabilized Carbamic Acid

Liu

2022

Ind. Eng. Chem. Res.

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Aqueous alkanolamine-based processes currently represent the most mature and widely employed CO2 capture technology. However, extensive energy input and severe equipment corrosion constitute their major and inherent drawbacks due to the involvement of vast amounts of water as the diluent. Water-lean absorbents are proposed to deliver potential benefits, such as higher capacity and enhanced energy efficiency, by abandoning the aqueous solvent or replacing it with organic counterparts. Great efforts have been devoted to the development of CO2 capture protocols under nonaqueous circumstance, but their industrial deployment is still challenged by the exponentially increasing viscosity during operation. In this work, a series of alkoxy-functionalized methylamines have been devised as single-component postcombustion CO2 absorbents under water-lean condition. These nonaqueous amines are capable of reversibly capturing CO2 with low viscosities (48–114 cP at 25 °C and 27–63 cP at 40 °C) at their maximal gravimetric capacities (15–21 wt % at 25 °C and 14–21 wt % at 40 °C). Comprehensive mechanistic studies by means of in situ Fourier transform infrared spectroscopy, density functional theory calculations, and control experiments revealed that the stabilization of sequestered CO2 via intramolecular hydrogen bonding between in situ formed carbamic acid and the flexible alkoxy side chain of the designed amines would play the key role in enhancing both the capacity and flowability. Meanwhile, thermal desorption of the captured CO2 could easily be carried out at a feasible temperature (75 °C) under ambient pressure, and the CO2-saturated absorbents have remained intact at 80 °C for 2 days within a closed system. Furthermore, these novel amines would exhibit considerable physisorption by operating at high-pressure conditions (20 and 30 bar), thanks to the inherent CO2-philicity of the alkoxy functionality. Hence, the integration of enhanced capacity, reduced operating viscosity, and mild regeneration makes such alkoxy-functionalized methylamine-type absorbent a compelling candidate for practical application.

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Nonaqueous MEA/PEG200 Absorbent with High Efficiency and Low Energy Consumption for CO₂ Capture

Cited by 31 publications

References 37 publications

Phase Splitting Rules of the Primary/Secondary Amine–Tertiary Amine Systems: Experimental Rapid Screening and Corrected Quasi-Activity Coefficient Model

Phase Splitting Rules of the Primary/Secondary Amine–Tertiary Amine Systems: Experimental Rapid Screening and Corrected Quasi-Activity Coefficient Model

CO₂ absorption and microwave regeneration with high‐concentration TETA nonaqueous absorbents

Alkoxy-Functionalized Amines as Single-Component Water-Lean CO₂ Absorbents with High Efficiency: The Benefit of Stabilized Carbamic Acid

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Nonaqueous MEA/PEG200 Absorbent with High Efficiency and Low Energy Consumption for CO2 Capture

Cited by 31 publications

References 37 publications

Phase Splitting Rules of the Primary/Secondary Amine–Tertiary Amine Systems: Experimental Rapid Screening and Corrected Quasi-Activity Coefficient Model

Phase Splitting Rules of the Primary/Secondary Amine–Tertiary Amine Systems: Experimental Rapid Screening and Corrected Quasi-Activity Coefficient Model

CO2 absorption and microwave regeneration with high‐concentration TETA nonaqueous absorbents

Alkoxy-Functionalized Amines as Single-Component Water-Lean CO2 Absorbents with High Efficiency: The Benefit of Stabilized Carbamic Acid

Contact Info

Product

Resources

About

Nonaqueous MEA/PEG200 Absorbent with High Efficiency and Low Energy Consumption for CO₂ Capture

CO₂ absorption and microwave regeneration with high‐concentration TETA nonaqueous absorbents

Alkoxy-Functionalized Amines as Single-Component Water-Lean CO₂ Absorbents with High Efficiency: The Benefit of Stabilized Carbamic Acid