International Journal of Environmental Research and Public Health
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2020
·Vol. 17
·期 4
·1452
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IF 2.849
Yankun Sun,Wanzhen Liu,Xinzhong Wang,Haiyan Yang,Jun Liu
A series of efficient adsorbents were prepared by a wet-impregnation method for CO2separation from simulated biogas. A type of commercially available silica, named as FNG-II silica (FS), was selected as supports. FS was modified with a mixture of polyethyleneimine (PEI) and ethanolamine (MEA) to improve the initial CO2adsorption capacity and thermal stability of the adsorbents. The influence of different adsorbents on CO2adsorption performance was investigated by breakthrough experiments. Scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR), and N2adsorption–desorption isotherm were used to characterize the silica before and after impregnating amine. Additionally, the thermal stability of adsorbents was measured by differential thermal analysis (TDA). Silica impregnated with mixtures of MEA and PEI showed increased CO2adsorption performance and high thermal stability compared with those obtained from silica impregnated solely with MEA or PEI. With a simulated biogas flow rate of 100 mL/min at 0.2 MPa and 25 °C, FS-10%MEA-10%PEI exhibited a CO2adsorption capacity of ca. 64.68 mg/g which increased by 81 % in comparison to FS-20%PEI. The thermal stability of FS-10%MEA-10%PEI was evidently higher than that of FS-20%MEA, and a further improvement of thermal stability was achieved with the increasing value of PEI/MEA weight ratio. It was showed that MEA was able to impose a synergistic effect on the dispersion of PEI in the support, reduce the CO2diffusion resistance and thus increase CO2adsorption performance. Additionally, if the total percentage of amine was the same, FS impregnated by different ratios of PEI to MEA did not exhibit an obvious difference in CO2adsorption performance. FS-15%PEI-5%MEA could be regenerated under mild conditions without obvious loss of CO2adsorption activity.Keywords:silica;solid amine;biogas
研究领域:
化学工程
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环境科学
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材料科学
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
·
IF 3.764
Hao Ling,Qiufeng Mao,Sen Liu,Hongxia Gao,Juan Lv,Yu Mao,Zhiwu Liang
Aqueous amine-based CO2 capture is considered as the most mature and applicable CO2 capture method for post-combustion. With the CO2 capture process running for a long time, the degradation of aqueous amine-based is inevitable, and the degradation products are numerous and complicated. Therefore, the performance evaluation of aqueous amine solutions containing degradation products is crucial in both guiding the selective removal of degradation products and maintaining or reducing of the solution cyclic utilization rate. Unfortunately, a simple and effective way to increase the economic feasibility of the CO2 capture process after accumulated degradation products remains absent, and little attention has been paid to the real effect of degradation products on the CO2 capture performance in aqueous amine solutions. In this work, we propose a simple method to evaluate the performance and regeneration energy of aqueous monoethanolamine (MEA) solutions accumulating single degradation products based on the fast-bubbling reactor. Using this method, it is possible to quickly determine the key degradation products that affect the performance of aqueous MEA solutions so as to achieving clearer optimization, more direct purification, and a reduced solution cyclic utilization rate.
研究领域:
化学工程
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环境科学
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能源技术
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Yinge Bai,Kaixuan Wang,Lulu Wang,Shaojuan Zeng,Lu Bai,Xiangping Zhang
CO 2 capture is an important technology to achieve carbon emission reduction. The key is reducing the energy consumption of the CO 2 capture process. Ionic liquids (ILs) blended with organic amines can be used as an efficient CO 2 absorbent allowing for low regeneration energy consumption. This work proposes the use of N-butylpyridinium nitrate ([Bpy][NO 3 ]) in combination with organic solvents for CO 2 capture. The effects of ILs concentration, reboiler load and flue gas concentration on regeneration energy consumption were studied on a continuous pilot unit for absorption-desorption process. The results showed that the CO 2 absorption capacity of 30 wt% MEA + 10 wt% [Bpy][NO 3 ] was 0.1308 g CO 2 /g solvent, higher than monoethanolamine/water, and the CO 2 absorption capacity remained at 74.3% after the five cycles. At 40 °C, the viscosity of IL-amine blending solvents before and after absorption was 2.01 and 3.534 mPa·s, respectively, significantly lower than that of the conventional non-aqueous phase absorbent. The continuous absorption-desorption results showed that the capture rate of IL blending reached more than 95%. The regeneration energy consumption is 34.2% lower than the 30 wt% MEA.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Kejin Yan,Haoyu Jiang,Shuai Yin,Yunhao Zhang,Yiheng Gong,Haijun Chen,Hao Peng
This study develops a novel microencapsulated carbon sorbent (MECS) by integrating a composite Na 2 CO 3 -MEA (monoethanolamine) absorbent with droplet microfluidics technology. Building upon the activation mechanism of MEA, the CO 2 absorption performances of Na 2 CO 3 -MEA composites at different molar ratios are systematically investigated. A multi-objective optimization function identifies an optimal composition that achieves a 149 % increase in CO 2 capture rate compared to Na 2 CO 3 solution alone, while maintaining excellent cost-effectiveness. Subsequently, this high-performance absorbent is encapsulated within a photocurable organosilicone shell via a triple-coaxial capillary microfluidic device, forming stable core-shell microcapsules (MECS@Na 2 CO 3 –MEA). By leveraging hydrodynamic tuning, we achieved precise control over the microcapsule's geometry, systematically tuning shell thickness and particle size to fundamentally optimize the performance for CO 2 absorption. Under a pressure of 0.7 atm and an optimized temperature of 40 °C, the MECS@Na 2 CO 3 –MEA demonstrates a 36 % higher CO 2 absorption capacity compared to an equivalent mass of the unencapsulated absorbent. This significant enhancement persists even under low CO 2 concentration conditions, where 33 % and 57 % improvement are observed at 1 vol% and 5 vol% CO 2 , respectively. Furthermore, the microfluidic fabrication method also permits the incorporation of magnetic nanoparticles, endowing the MECS with dual functionality: magnetic responsiveness that enables remote steering and further improves CO 2 absorption performance. This work presents a promising, cost-effective approach for developing high-performance materials for carbon capture applications.
研究领域:
化学工程
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环境科学
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材料科学
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微流控技术
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碳捕集技术
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Song Zhou,Yunlong Zhu,Hongyuan Xi,Ze Hao,Zhitao Han,Chengqi Sun
Large–scale CO 2 emissions have raised international concerns as they lead to global temperature rise. Consequently, mitigating CO 2 emissions has emerged as a central focus of interdisciplinary research. Although onboard carbon capture technology proves effective in reducing a ship's CO 2 emissions, challenges persist in the form of high desorption energy consumption and low CO 2 loading of the absorbents. In this study, a novel polyamine–based mixed amine system based on marine engine exhaust CO 2 capture technology has been developed to reduce desorption energy consumption and enhance CO 2 loading. Additionally, the reaction mechanisms of CO 2 with polyamine–based mixed amine were investigated using a combination of quantum chemical calculations and nuclear magnetic resonance (NMR) techniques. The results indicated that compared to monoethanolamine (MEA) with the same mass fraction, the CO 2 loading of the new mixed absorbent tetraethylenepentamine (TEPA) + MEA increased by 7 % and the desorption heat duty reduced by 18.1 %. The analytical approach results showed that in the case of 7.5 wt% TEPA + 7.5 wt% MEA solution, proton transfer was predominantly governed by TEPA, whereas MEA primarily engaged in the reaction with CO 2 . During desorption at 368 K, the released CO 2 primarily arose from HCO 3 − and CO 3 2− . These findings hold academic and practical significance for the advancement of more efficient carbon capture technologies in maritime applications.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Hao Ling,Sen Liu,Hongxia Gao,Zhiwu Liang
In order to study the effect of heat-stable salts (HSSs) on the CO 2 absorption performance of amine solution, the CO 2 absorption/desorption rates and cyclic CO 2 capacity of 30 wt% (monoethanolamine) MEA solutions in the presence of various acidic degradation products were comprehensively investigated systematically by an improved rate-based screening method. In addition, the initial pH values and CO 2 equilibrium solubility were also evaluated. These acidic degradation products considered were formic acid , acetic acid, propionic acid , butyric acid , glycolic acid, oxalic acid , lactic acid, malonic acid and bicine. The experimental results indicated that the carboxylic acids with different chemical structures can reduce the initial pH values, equilibrium solubility of CO 2 , absorption rate and cyclic CO 2 solubility, but promote the CO 2 desorption rate of aqueous MEA solution. Furthermore, a countermeasure was proposed to maintain absorption performance and reduce the energy requirement of solvent regeneration for an MEA amine-treating unit. The obtained results can provide a guidance for developing corresponding countermeasure for heat-stable salts control and removal in the CO 2 absorption-stripping process using amine solutions.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2023
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IF 2.6
Mingcheng Li,Xiaojie Liu,Chunying Zhu,Taotao Fu,Xiqun Gao,Youguang Ma
Densities and viscosities were measured for binary solutions MEA (monoethanolamine) + 3DMA1P (3-dimethylamino-1-propanol), 3DMA1P + H 2 O and ternary solutions MEA + 3DMA1P + H 2 O at P = 0.101 MPa, T = 293.15 K ∼ 333.15 K. Based on the experimental densities of solutions, the volume properties of the excess molar volume, partial molar volume, apparent molar volume and limiting partial molar volume were calculated. Moreover, the viscosity deviation and viscous flow activation energy were calculated based on the experimental viscosity. Additionally, the intermolecular interactions of the mixed solutions were analyzed and discussed, and the Redlich-Kister equation was used to correlate the excess molar volume and viscosity deviation of the binary solutions.
研究领域:
物理化学
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溶液化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yao Shen,Ke Wang,Lu Li,Jingkai Zhao,Jiexu Ye,Ping Chen,Xiang Gao,Shihan Zhang
Catalyst-aided CO 2 desorption offers a promising reduction in the energy penalty of amine scrubbing, but faces the challenges of slow mass transfer, sluggish desorption kinetics, and susceptibility to deactivation. In this work, a hollow composite catalyst C@ZrO 2 was developed to simultaneously realize rapid electron, proton and mass transfer for CO 2 desorption via facilitating proton-coupled electron transfer (PCET) effect. The CO 2 desorption rate of benchmark MEA solution increased by 126% and relative heat duty decreased by 69.9% in presence of C@ZrO 2 , and its catalytic performance didn’t noticeably decline after 10 cycles. Additionally, the desorption rate of biphasic solvents with a high viscosity increased by 112% and relative heat duty decreased by 57.3% with C@ZrO 2 . Based on theoretical calculation, the facilitated PCET efficiency of carbon layer increased the binding energy of carbamate to enhance its mass transfer rate from the liquid phase to the C@ZrO 2 surface, and stretched the C-N bond to reduce the proton transfer energy barrier by 66.8%. This work provided a novel insight to design catalysts for energy-efficient and stable CO 2 capture.
研究领域:
化学工程
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催化材料
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环境科学
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DOI
高影响因子
Membranes
·
2021
·Vol. 12
·期 1
·8
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IF 4.106
Yunzhao Guo,Wenbo Qi,Kaiyun Fu,Xianfu Chen,Minghui Qiu,Yiqun Fan
Ceramic membrane contactors hold great promise for CO2desorption due to their high mass transfer area as well as the favorable characteristics of ceramic materials to resist harsh operating conditions. In this work, a hydrophobic tubular asymmetric alpha-alumina (α-Al2O3) membrane was prepared by grafting a hexadecyltrimethoxysilane ethanol solution. The hydrophobicity and permeability of the membrane were evaluated in terms of water contact angle and nitrogen (N2) flux. The hydrophobic membrane had a water contact angle of ~132° and N2flux of 0.967 × 10−5mol/(m2∙s∙Pa). CO2desorption from the aqueous monoethanolamine (MEA) solution was conducted through the hydrophobic tubular ceramic membrane contactor. The effects of operating conditions, such as CO2loading, liquid flow rate, liquid temperature and permeate side pressure, on CO2desorption flux were investigated. Moreover, the stability of the membrane was evaluated after the immersion of the ceramic membrane in an MEA solution at 373 K for 30 days. It was found that the hydrophobic α-Al2O3membrane had good stability for CO2desorption from the MEA solution, resulting in a <10% reduction of N2flux compared to the membrane without MEA immersion.Keywords:membrane contactor;carbon dioxide;desorption;ceramic membrane
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED ENERGY
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2018
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IF 7.9
Fei Liu,Mengxiang Fang,Wenfeng Dong,Tao Wang,Zhixiang Xia,Qinhui Wang,Zhongyang Luo
Using biphasic solvents for carbon dioxide (CO 2 ) capture is regarded as a promising technology to drastically reduce the regeneration energy. However, this technology hasn’t been put into commercial application due to lack of the biphasic solvents with high stabilities and low costs. To overcome this challenge, we developed a novel type of biphasic solvent based on alkanolamine-alkanolamine blends, i.e., aqueous blends of 2-(diethylamino)-ethanol (DEEA, 50 wt%) and monoethanolamine (MEA, 25 wt%) or 2-((2-aminoethyl) amino) ethanol (AEEA, 25 wt%). The aqueous DEEA-AEEA solvent demonstrated a cyclic capacity as high as 0.64 mol CO 2 /mol which is significantly higher than those of 30 wt% MEA and other reported biphasic solvents. In addition, a phase split time as short as a few minutes is obtained. The phase split dynamics were analyzed to investigate the effects of CO 2 loading, temperature, gas flow rate and height-to-diameter ratio. Quantitative 13 C NMR analysis was then performed to reveal the reaction and phase split mechanism of CO 2 absorption in the DEEA-AEEA solvent. It indicated that the reaction of AEEA with CO 2 dominated at the beginning of CO 2 absorption and the products are formed as carbamates. Then, DEEA began reacting with CO 2 to yield bicarbonate and carbonate. The phase split mechanism indicated that the reaction products of carbamates and HCO 3 − /CO 3 2− migrated to the lower phase while DEEA and unreacted AEEA migrated to the upper phase. Finally, the cyclic tests were repeated and the energy consumption was evaluated. The regeneration energy of the biphasic solvent, without process optimizations, is 2.58 GJ/tCO 2 , which is 32% lower than that of the traditional 30 wt% MEA solvent.
研究领域:
化学工程
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环境科学
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能源技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
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IF 4.7
Mengjie Chen,Qinlan Luo,Haizhou Lin,Qiang Sun,Hongxia Gao,Sen Liu,Yuanyuan Li,Zhiwu Liang
The kinetic behavior of the reaction of CO 2 with MEA-TREA in ethanol solution was studied using the stopped-flow technique. The results indicate that the zwitterion mechanism successfully correlates the experimentally measured pseudo first-order reaction constant ( k 0 ) and that the TREA participated in the deprotonation step of MEA-zwitterion as an alkaline substance after the formation of MEA-zwitterion. Then, the applicability of this proposed mechanism was investigated by using the reaction kinetics of CO 2 with MEA-DMEA, MEA-DEEA, MEA-MDEA, DEA-TREA, DEA-DMEA blended amines in non-aqueous ethanol solution, as well as MEA-TREA, MEA-DMEA, DEA-TREA, DEA-DMEA blended amines in water-lean solutions. It was found that the mechanism of the reaction of CO 2 with these mixed amines can be expressed by: k 0 = K A - A z [ A ] 2 + K A - B z [ A ] [ B ] + K 1 z [ A ] . The ethanol and water molecules which contribute to K 1 z can be used as proton transfer channels to accelerate proton transfer, but they do not directly participate in the reaction. In addition, the alkalinity and the steric hindrance effect controlled by the molecular structure of tertiary amines affected the reaction rate at the same time. The activation energies in MEA-EtOH and MEA-TREA-EtOH system were estimated by fitting the second-order rate constants to the Arrhenius expression, indicating that TREA can reduce the reaction activation energy and make the reaction more kinetically favorable.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Xiao-Han Pan,Ling-Xiao Fu,Huan Wang,Yi Xue,Jian-Hua Zu
A novel sulfydryl-functionalized adsorbent PP-g-GMA@MEA for recovery of Ag(I) was synthesized by γ-ray induced simultaneous grafting of glycidyl methacrylate (GMA) onto polypropylene (PP) non-woven fabric, followed by ring-opening processes with mercaptoethylamine (MEA). The obtained adsorbents before and after adsorption of Ag(I) were fully characterized by SEM, EDS, FT-IR spectra, XRD and XPS. Batch adsorption experiments were carried out to evaluate adsorption abilities of the adsorbents under high acidity. The adsorption kinetics of Ag(I) were well fitted with pseudo-second-order kinetics model. The maximum adsorption capacity calculated by the Langmuir isotherm model was 262.51 mg/g at 25 °C. EDS, XRD and XPS analyses confirmed the mechanism of adsorption under high acidity was chelating reaction between -SH and Ag(I) and ion exchange adsorption towards [Ag(NO 3 ) 2 ] −1 . Through competitive adsorption tests, the PP-g-GMA@MEA was found remarkably selective towards Ag(I) when it coexisted with Cu(II), Co(II), Ni(II) and Cr(III) in high acidity medium. Therefore, the developed PP-g-GMA@MEA composite would be a promising adsorbent for Ag(I) recovery from industrial effluents.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
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