Energy Consumption Of CO2 Capture Research Articles

High ethane content enables efficient CO2 capture from natural gas by cryogenic distillation

Cryogenic CO2 capture technique is superior to other CO2 capture methods in terms of potential environmental protection, because it uses no chemical solvent or membrane materials that need regular replacement. However, the freezing problem of CO2 makes it difficult to achieve CO2 capture through simple gas–liquid separation, and the existing cryogenic CO2 capture techniques often require a specially designed separation equipment. In addition, cryogenic CO2 capture is generally considered a method with high energy consumption due to the need for refrigeration. This study proposes a cryogenic distillation-based CO2 capture method for natural gas with high ethane content, such as shale gas and oilfield associated gas. This method utilizes the azeotropic characteristics of CO2 and ethane to avoid CO2 freeze-out and the energy consumption for CO2 capture is minimized through process integration with natural gas liquefaction and ethane recovery. The proposed system uses the propane precooled mixed refrigerant process to provide the required refrigeration, and it is simulated in Aspen HYSYS and optimized by a combined method of a genetic algorithm and sequential optimization. The results show that the proposed process can remove up to 17 mol% of CO2 to less than 50 ppm. With extractive distillation, 99.50 % of the ethane in the feed gas is recovered with a purity of 99.50 mol%. The optimal results corresponding to the maximum allowable CO2 content to avoid its freeze-out (with a solubility margin of 500 ppm) show that when ethane content is 2–20 mol%, the specific power consumption of the system is about 0.43 kWh/Nm3(NG) with an exergy efficiency higher than 50 %. The proposed process achieves energy-saving and efficient CO2 capture method for natural gas with high ethane content.

Water effect on CO2 absorption mechanism and phase change behavior in [N1111][Gly]/EtOH anhydrous biphasic absorbent: In density functional theory and molecular dynamics view

Ionic liquids-based anhydrous biphasic absorbents have the potential to lower the energy consumption for CO2 capture. Recent experimental studies have revealed that the presence of water in [N1111][Gly]/EtOH system leads to generation of a new CO2-product – bicarbonate and affects the phase change behavior. However, the reaction pathway for bicarbonate formation remains unclear. In this work, the reaction pathways were investigated in depth through quantum chemical calculations employing density functional theory, with reaction rate constants determined via transition state theory. Among the three possible reaction pathways, the base-catalyzed CO2 hydration reaction prevailed, i.e. a one-step reaction involving [Gly]-, H2O, and CO2. An H atom in H2O was transferred to [Gly]-’s amino group, forming protonated [Gly]-, and hydroxide combined with CO2 to generate bicarbonate. Additionally, molecular dynamics simulations were conducted to understand the phase change behaviors with varying water content. When water content exceeded 5 wt%, an increased water content led to reduced hydrogen bonding among products and enhanced hydrogen bonding of products-solvent with the solvent, diminishing product self-aggregation. No phase change behavior were observed at water contents up to 80 wt%. This study could well explain the experimental phenomena of water effect on CO2 absorption in [N1111][Gly]/EtOH, providing theoretical references for application of ILs-based anhydrous biphasic absorbent.

Quantitative analysis method for absorption mechanism and energy consumption of CO2 capture by amino acid ionic liquids

Amino acid ionic liquids (AAILs) are attractive candidates for CO2 capture due to their high solubility for CO2. Quantitatively analyzing the interaction of amino groups in AAILs with CO2 and evaluating the energy consumption of CO2 capture is critical to the molecular design of ideal AAILs. In this work, a thermodynamic model based on the cubic plus association equation of state was proposed to calculate the contribution from the chemical reactions between various stoichiometric ratios of CO2 and AAIL (Nm:n,m:n is stoichiometric ratio) on CO2 solubility. The results show that the larger contribution to the CO2 solubility in [Glu], [Tyr] and [Gln]-IL with strong polar groups is derived from association scheme N1:2, while the N1:1 association interaction is the dominant contribution of [Gly], [Ala], [Val] and [Pro]-IL with hydrogen atom or short alkyl side chains, and [VBIm]-IL with multiple amino groups. The N2:1 association interaction is primary between CO2 and [Cho][His] or [Cho][Arg]. Besides, the contributions of these association effects are greater than that of dispersion and repulsion to CO2 solubility. Then, the solvent cyclic capacity and regeneration energy of AAILs in the pressure swing and temperature swing CO2 capture system were estimated. More amino groups result in higher regeneration energy consumption and do not necessarily increase solvent cyclic capacity. Among the studied AAILs, [Cho][Gly] which exhibits high cyclic capacity and low energy consumption has great potential in CO2 capture solvent.

Facile synthesis of structured adsorbent with enhanced hydrophobicity and low energy consumption for CO2 capture from the air

Facile synthesis of structured adsorbent with enhanced hydrophobicity and low energy consumption for CO2 capture from the air

Low-concentration CO2 capture system with liquid-like adsorbent based on monoethanolamine for low energy consumption

Direct air capture (DAC) of atmospheric CO2 is becoming ever more important for a carbon neutral society. To achieve this, it is critical to reduce the energy consumption of DAC systems. In this work, as a solution, a liquid-like adsorbent (LLA) is used as an adsorbent for DAC of low-concentration CO2. We improve the performance of LLA with monoethanolamine (MEA), and named it as LLA-M to efficiently capture atmospheric CO2 and reduce energy consumption at DAC environment. The effective dispersion of MEA in the LLA promotes CO2 capture by overcoming their low thermal stability. When 40 wt% MEA is added, the highest performance is achieved along with a CO2 capture capacity of 2.50 mmol g−1 in 100% CO2 atmosphere and 1.01 mmol g−1 in low CO2 concentration atmosphere. The loss and deterioration of MEA is suppressed by the LLA and therefore the performance is stably maintained while repeating the CO2 capture/regeneration cycles. Consequently, the CO2 capture capacity is improved by 29.9% compared with when using only MEA. More importantly, the results indicate a record CO2 capture energy consumption of 0.89 GJ tCO2−1 at 100% CO2 condition and 2.13 GJ tCO2−1 at 400 ppm CO2 condition. Furthermore, the LLA-M can be recycled below 120 °C which makes it possible to reduce energy consumption by exploiting renewable energies such as solar heat. This study offers a promising low-carbon route for efficient atmospheric CO2 capture using an LLA incorporated with MEA.

Techno-Economic Comparison of Integration Options for an Oxygen Transport Membrane Unit into a Coal Oxy-Fired Circulating Fluidized Bed Power Plant.

The inclusion of membrane-based oxygen-fired combustion in power plants is considered an emerging technology that could reduce carbon emissions in a more efficient way than cryogenic oxygen-fired processes. In this paper, a techno-economic assessment was developed for a 863 MWel,net power plant to demonstrate whether this CCS technique results in a reduction in efficiency losses and economic demand. Four configurations based on oxygen transport membranes were considered, while the benchmark cases were the air combustion process without CO2 capture and a cryogenic oxygen-fired process. The type of driving force through the membrane (3-end or 4-end), the point of integration into the oxy-fuel combustion process, the heating system, and the pollutant control system were aspects considered in this work. In comparison, the efficiency losses for membrane-based alternatives were lower than those in the cryogenic oxygen-fired process, reaching savings of up to 14% net efficiency. Regarding the specific energy consumption for CO2 capture, the configuration based on the oxygen transport membrane unit with 4-end mode and hot filtration presented 1.01 kWel,net,·h/kgCO2 captured with 100% CO2 recovery, which is an improvement of 11% compared with the cases using cryogenic oxygen. Comparing economic aspects, the specific investment costs for cases based on the oxygen transport membrane unit varied between 2520 and 2942 $/kWel,net·h. This was between 39.6 and 48.2% above the investment for the reference case without carbon capture. However, its hypothetical implantation could suppose a savings of 10.7% in terms of investment cost compared with cryogenic oxygen-based case. In terms of the levelized cost of electricity and the cost of CO2 avoidance, the oxygen transport membrane configurations achieved more favorable results compared with the cryogenic route, reaching savings up to 14 and 38%, respectively. Although oxygen transport membrane units are currently not mature for commercial-scale applications, the results indicated that its application within carbon capture and storage technologies can be strongly competitive.

Photoinduced phase transitions in nanogel particles for reversible CO2 capture

Solar energy has been utilized to strip CO2 for saving the CO2 capture energy consumption. However, a large temperature swing is necessary for higher regeneration efficiency, which also will result in a serious materials degradation. Herein, we report a photo triggered phase transition strategy for reversible capture CO2 using amine containing nanogel particles-based solvents with a small temperature swing. The composite absorbents were prepared by combing N-[3-(dimethylamino)propyl]methacrylamide containing nanogel particles with polydopamine. The phenomenon of photoinduced phase transition was observed in both nanogel particles-based solvents and the composite absorbents. Although the nanogel particles can release most of CO2 undergo a light irradiation, the composite absorbents present a more faster desorption rate than the former, which can be explained by an enhanced light absorbability and photothermal conversion efficiency of the latter. An average CO2 regeneration efficiency can reach up to 92.45% in five CO2 uptake and release cycles, indicating that the photo triggered phase transition can be used to develop energy efficient CO2 capture technology.

2-Amino-2-methyl-1-propanol regulated triethylenetetramine-based nonaqueous absorbents for solid-liquid phase-change CO2 capture: Formation of crystalline powder products and mechanism analysis

Solid-liquid phase-change absorbents (SLPCAs) have a great potential to reduce the energy consumption of CO2 capture. The main issue in the practical application of SLPCAs is the difficulty in the phase separation of gelatinous solid products. In this study, 2-amino-2-methyl-1-propanol (AMP) was used as a regulator to tune the physical form of the solid products of triethylenetetramine (TETA)-based SLPCAs. Experimental results showed that the AMP-regulated TETA-based SLPCAs successfully avoided the formation of gelatinous products (viscosity up to more than 1000 mPa·s) and yielded easily separated crystalline powders. Among the investigated SLPCAs, TETA/AMP/N-methyl-2-pyrrolidone (NMP) (TETA:AMP = 2:8, 1 M) exhibited the best CO2 capture performance with a high CO2 loading of 0.94 mol·mol−1 and a high regeneration efficiency of 84.14 %. XRD, FT-IR and 13C NMR analyses indicated that TETA/AMP/NMP absorbed CO2 to form highly polar carbamate species and protonated amines, which could break the original assimilation state of the SLPCA system; thus, the polar products precipitated out from less polar NMP, leading to a phase change. The theoretical calculations revealed that in the absence of AMP, the TETA-derived products had a tendency to form gelatinous aggregation with large amounts of hydrogen bonds; with the introduction of AMP, the AMP-derived products tended to combine with the TETA-derived products via strong electrostatic attraction and Van der Waals force and effectively inhibited the aggregation formation. Since there was only one hydrogen bond forming between the AMP- and TETA-derived product molecules, the amount of hydrogen bonds was significantly reduced. Eventually, the TETA/AMP/NMP SLPCA avoided the formation of gelatinous products and yielded crystalline powder products.

EMmim][NTf2 ]-a Novel Ionic Liquid (IL) in Catalytic CO2 Capture and ILs' Applications.

Ionic liquids (ILs) have been used for carbon dioxide (CO2 ) capture, however, which have never been used as catalysts to accelerate CO2 capture. The record is broken by a uniquely designed IL, [EMmim][NTf2 ]. The IL can universally catalyze both CO2 sorption and desorption of all the chemisorption-based technologies. As demonstrated in monoethanolamine (MEA) based CO2 capture, even with the addition of only 2000ppm IL catalyst, the rate of CO2 desorption-the key to reducing the overall CO2 capture energy consumption or breaking the bottleneck of the state-of-the-art technologies and Paris Agreement implementation-can be increased by 791% at 85°C, which makes use of low-temperature waste heat and avoids secondary pollution during CO2 capture feasible. Furthermore, the catalytic CO2 capture mechanism is experimentally and theoretically revealed.

Numerical analysis on the geometrical design of liquid cooling based carbon capture by adsorption for higher thermal efficiency

Thermal design and management is important to improve the CO2 capture by adsorption's efficiency, but current studies only consider geometric designs of a specific size. This paper develops a 2D multi-physics model to study how the spacing between two fluid pipes in the adsorbent bed affects the desorption performance, which couples the species transport, fluid dynamics, and heat transfer modules. Specifically, the model involves sandwiching the adsorbent bed between two fluid pipes, which will be parametrically studied in terms of the CO2 desorption performance, with indicators being the thermal efficiency, and the speed of CO2 desorption. Results reveal that a trade-off exists where the desorption speed decreased from 0.9 to 0.05 mol/(m3 s) when the bed height changes from 1 cm to 10 cm, but the thermal efficiency will correspondingly increase from 0.52 to 0.85. Furthermore, a sensitivity analysis on this trade-off situation is conducted by varying the thermal conductivity, regeneration temperature, CO2 feed concentration, and applying thermally conductive fins. Results reveal that increasing the thermal conductivity provides the most reasonable performance improvement characteristics as it halved the desorption time while the specific energy consumption for CO2 capture remains largely unaffected.

Analysis of the mechanism of energy consumption for CO2 capture in a power system

The rather high energy penalty of CO2 capture is the critical gap deterring the deployment of Carbon capture and storage technologies. A deeper understanding of the mechanism of CO2 capture will lay a foundation for reducing energy consumption. Accordingly, this paper introduced a thermodynamic analysis method with a new criterion to reveal the mechanism of energy consumption in a power system integrating CO2 capture. The results indicate that although the energy consumption of the separation process in post-combustion capture is generally recognized as the dominant part of the capture penalty, the deterioration of energy utilization in power systems due to the provision of energy for CO2 separation is nonnegligible. For an improvement in separation efficiency, the ceiling of 50% separation efficiency indicates a penalty as low as 6 percent points, and a CO2 capture cost of approximately 24 $/tCO2 can be anticipated. For system integration, improving the energy-supplying method by shifting to an external energy source may be expected to be a preferable way to save energy. With the aid of the new thermodynamic analysis method, a better understanding of the performance of diverse CO2 capture technical routes can be obtained, which may be helpful for reducing energy consumption in CO2 capture technologies.

Study of an integrated gas turbine -Molten carbonate fuel cell-organic Rankine cycle system with CO2 recovery

A huge amount of energy is consumed by recovering CO2 in the gas turbine (GT) exhaust gas with the traditional method because of the low CO2 concentration. A new system integrated with gas turbine, MCFC and ORC with CO2 capture is proposed in this article. CO2 in the gas turbine exhaust gas is concentrated by the MCFC electrochemical reaction. Compared with traditional CO2 capture methods, it effectively decreases the energy consumption of CO2 capture. The mid-temperature exhaust gas heat is recovered by two stages organic Rankine cycle systems. The influences of the major parameters on the new system performance are deeply studied. Also, the thermal and economic performances of the new system are compared with those of the reference system without CO2 capture and with CO2 capture based on the traditional mono-ethanol ammine (MEA) method. The results show that, when the CO2 capture rate is 0.85, the thermal efficiency of the new system is 62.34%, 3 percentage points higher than that of the gas steam combined cycle system without CO2 capture; and the exergy efficiency is 60.08%, 2.47 percentage points higher than that of the gas steam combined cycle system without CO2 capture. Its economic performance will be improved with the reduction of the MCFC cost in the future.

Inducing efficient proton transfer through Fe/Ni@COF to promote amine-based solvent regeneration for achieving low-cost capture of CO2 from industrial flue gas

Catalytic amine-based solvent regeneration with solid acid is a feasible option for reducing energy consumption of CO2 capture, but facing crucial challenges on designing material structures and understanding reaction mechanisms. Herein, we cover the nanoscale NiFe2O4 cluster with covalent organic frameworks (COFs), to prepare solid acid catalysts. The pristine chemical bonds of Ni(Fe)-O and Ni(Fe)-Ni(Fe) are substituted by Ni(Fe)-N and Ni(Fe)-N-Ni(Fe) by targeting the anchoring of NiFe2O4 cluster over COFs. The created coordination state stimulates the production of Brønsted acid sites. The obtained nanomaterials achieve a considerable improvement in CO2 desorption of up to 290.1 mmol/(min·g) at 88 °C for spent monoethanolamine (MEA) solvent, representing a substantial increase of 540% relative to traditional thermal desorption. Consequently, the energy consumption of MEA generation is reduced by approximately 58%. Intermediate species (HCO3−, CO32−, and RNHCOO−) and reaction pathways are established by combining operando Raman spectroscopy and ex situ 13C NMR spectrum measurements. Theoretical calculations are performed to clarify the transformation mechanism of the acid sites around Ni/Fe atoms and its intrinsic role in the adsorption equilibrium of solvent regeneration.

Combined experimental and computational study on the promising monoethanolamine + 2-(ethylamino)ethanol + sulfolane biphasic aqueous solution for CO2 absorption

To reduce the regeneration energy consumption for CO2 capture, an advanced monoethanolamine (MEA) + 2-(ethylamino)ethanol (EAE) + sulfolane biphasic aqueous solution was developed, and the phase separation mechanism was explored. The effects of the concentration ratio on the phase separation behavior, CO2 absorption performance, CO2 loading at the phase separation point, and CO2 desorption performance of MEA + EAE + sulfolane solutions were investigated comprehensively in experiments. The 3 M MEA + 2 M EAE + 5 M sulfolane showed the best properties with a large CO2 loading of 0.32 mol/mol at the phase separation point and the relative low regeneration energy consumption, which is comparable to 5 M MEA in absorption with an improved desorption performance. The molecular mechanism of phase separation was revealed by molecular dynamics simulations, illustrating that strong hydrogen bonding between amine products and water and enhanced intermolecular interaction among amine products, would promote an aggregation of amine products. This study provides a promising candidate for energy-efficient CO2 capture with molecular insights into a liquid–liquid phase separation.

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

AbstractWhile 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.

Engineered assembly of water-dispersible nanocatalysts enables low-cost and green CO2 capture

Catalytic solvent regeneration has attracted broad interest owing to its potential to reduce energy consumption in CO2 separation, enabling industry to achieve emission reduction targets of the Paris Climate Accord. Despite recent advances, the development of engineered acidic nanocatalysts with unique characteristics remains a challenge. Herein, we establish a strategy to tailor the physicochemical properties of metal-organic frameworks (MOFs) for the synthesis of water-dispersible core-shell nanocatalysts with ease of use. We demonstrate that functionalized nanoclusters (Fe3O4-COOH) effectively induce missing-linker deficiencies and fabricate mesoporosity during the self-assembly of MOFs. Superacid sites are created by introducing chelating sulfates on the uncoordinated metal clusters, providing high proton donation capability. The obtained nanomaterials drastically reduce the energy consumption of CO2 capture by 44.7% using only 0.1 wt.% nanocatalyst, which is a ∽10-fold improvement in efficiency compared to heterogeneous catalysts. This research represents a new avenue for the next generation of advanced nanomaterials in catalytic solvent regeneration.

Effect of amine properties on developing CO2 phase change absorbents by means of cosolvent effect

As China pledges that its carbon emissions will peak before 2030 and that it will be carbon neutral by 2060, the CO2 capture technology with high efficiency and low energy-consumption was expected in industry. CO2 phase change absorbents, CPCAs, had shown a potential to reduce energy consumption for CO2 capture. Although a lot of CPCAs were reported in the last decade, it still suffered from the lack of theoretical guidance for development. The effect of amine structure, which mainly affects cosolvent effect of amine and salting-out effect of formed salts, on developing CPCAs by means of cosolvent effect was clarified. For cosolvent effect of amine, 12 amines with various carbon chain lengths, isomers and substituents were determined by thermodynamical method and the log P of amine were proposed to characterize the cosolvent effect. The amine with long carbon chain and steric effect showed a high ability to act as a cosolvent to enhance the solubility of 1-butanol in H2O. The salting-out effect of formed salts by reacting amine and CO2 was related to pKa of amine. The absorbent comprising amine with low log P and high pKa was prefer to exhibit phase separation behavior, and benefit to develop CPCAs. Based on this guideline, all amines in this study could be developed as CPCAs by adjusting kinds of amine and diluent. Moreover, to explore the absorption-desorption performance of developed CPCAs, DEA/1-butanol/H2O was used as example, the volume ratio, species distributions and CO2 cyclic capacity were measured. When the absorption temperature was 303 K and desorption temperature was 373 K, The maximum CO2 cyclic capacity of CPCA was 2.03 mol CO2·kg−1, which was 34.4% higher than that of 30 wt% DEA/H2O.

Analysis of the Mechanism of Energy Consumption for Co2 Capture in a Power System

Analysis of the Mechanism of Energy Consumption for Co2 Capture in a Power System

Performance and sensitivity analysis of packed-column absorption process using multi-amine solvents for post-combustion CO2 capture

Although many novel multi-amine solvents with high CO2 solubility were reported, they have not yet been evaluated for the performance in CO2 absorption processes. In this study, the efficiency and inside profile of the packed-column CO2 absorption process using a novel multi-amine solvent were investigated by using a mathematical model. Three amine solvents were selected: 2-(2-aminoethylamino)-ethanol (AEEA) and diethylenetriamine (DETA) as multi-amine solvents and monoethanolamine (MEA) as a reference. Based on the 90% capture efficiency of flue gas CO2 from a coal-fired power plant, a sensitivity analysis using the liquid-to-gas ratio was conducted to minimize the energy consumption for CO2 capture. Based on the utilization of the same 30 wt% solvent, the lowest reboiler thermal energy achieved by the process using DETA was 3.242 GJ/tonCO2, which was 8.57% lower than that obtained when MEA was employed. In contrast, the process using AEEA required 7.04% higher energy than MEA. In the process modified by rich-solvent split for further enhancing efficiency, the DETA process could achieve 2.962 GJ/tonCO2, which reduced the reboiler duty by 16.8% from the MEA process. The CO2 capture performance of absorbents could not be evaluated not only by the absorption rate and capacity. Owing to the larger molecular weight of multi-amines than MEA, the performance of capture and regeneration was discussed with respect to the amine properties and number of amine moles in the solution. A well-selected multi-amine for a modified process configuration has considerable potential for improving the energy efficiency of CO2 capture.

Sustainable ionic liquid organic solution with efficient recyclability and low regeneration energy consumption for CO2 capture

• A novel AFIL organic solution was proposed for CO 2 capture. • The novel AFIL organic solution has obvious advantage in the recyclability and viscosity. • The regeneration energy was 2.30 GJ·t −1 CO 2 and 39.5% lower than that of MEA/water. • The reaction mechanism of [TEPAH][AICA]/NPA/EG solution was comprehensively elucidated. A novel sustainable amino functionalized ionic liquid (AFIL) organic solution of tetraethylene pentamine 5-amino-4-imidazolecarboxamide/n-propanol/ethylene glycol ([TEPAH][AICA]/NPA/EG) was proposed for CO 2 capture to reduce the regeneration energy consumption. The solution had an efficient absorption loading of 1.78 mol·mol −1 , and it still maintained a good recyclability after 10 cycles (regeneration efficiency > 88%). Under this condition, the regeneration energy consumption was 2.30 GJ·t −1 CO 2 , which was 39.5% lower than that of MEA/water. The absorption and desorption mechanisms were investigated by 13 C NMR. For CO 2 absorption reaction, N atom of [AICA] − combined with CO 2 to form the carbamate directly, while other amino groups followed the zwitterion formation and deprotonation. Then some carbamates combined with alcohol to form the alkyl carbonates. For CO 2 desorption reaction, both the alkyl carbonates and carbamates combined with AFILH + to decompose, but the alkyl carbonates decomposed completely and a small amount of carbamates remained, indicating that carbonate was easier to decompose than carbamate. The novel [TEPAH][AICA]/NPA/EG solution with low energy consumption and good recyclability, which provides a sustainable strategy for advancing carbon capture technologies.