CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shuai Wang,Guangyi Cui,Yue Gu,Zhixuan Ma,Jing Wang,Shufeng Shen
Water-lean liquid–liquid biphasic absorbents have recently received increasing attention due to the potential advantages for capturing low CO 2 concentration flue gas with high efficiency in capture rate and energetic aspects. However, performance assessment has rarely been performed in a lab-scale continuous and integrated capture plant. In this work, a water-lean biphasic system containing 2-(methylamino) ethanol (M), diglyme (D) and water (H) was proposed for about 5 vol% CO 2 exhaust gas treatment based on the batch absorption–desorption capture tests. Integrated phase changing capture process using the developed absorbent formulation 40 M−50D−10H (WLS-10C) was demonstrated in a lab-scale CO 2 capture plant over 200 hrs testing. Energetic and capture performance as well as operational stability were evaluated and compared with aqueous 30 mass % MEA under the same targeted capture rate (about 90 %). The stable phase change behavior after CO 2 absorption was observed in the phase separator, and the CO 2 rich phase can be effectively regenerated at 393 K, forming a monophasic solution in the feed tank with the CO 2 lean phase from the separator for solvent reuse. This biphasic WLS-10C can reduce the energy consumption by about 45–55 % compared with aqueous MEA at about 90 % capture rate, demonstrating a pronounced energy-saving effect. Moreover, volumetric mass transfer coefficient and viscosity were also discussed. These findings provide valuable insights into the further pilot demonstration of the proposed biphasic absorbent.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yanan Yu,Yao Shen,Xiaowei Zhou,Fan Liu,Shihan Zhang,Shijian Lu,Jiexu Ye,Sujing Li,Jianmeng Chen,Wei Li
Biphasic solvent has been widely studied for CO 2 capture due to its excellent energy-saving potentiality. However, its complex composition makes the prediction of main performances, like phase separation behavior or absorption rate, become obscure and difficult. This work investigated the relationship between the physical properties of tertiary amines and proton transfer process, phase separation behavior and absorption rate of biphasic solvents via quantum calculation and experimental results. The high electronegativity of tertiary amine N atom makes the biphasic solvent exhibit the fast phase separation rate and absorption rate, and maximum phase separation rate can reach 0.056 min −1 . Furthermore, the increase of N atom polarity can delay the appearance of phase separation peak and stabilize the absorption rate during the counter-current absorption process. We believe that the relationship revealed by this work can deepen the understanding for screening and practical applying of biphasic solvents.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2022
·
IF 8.857
Xiaobin Zhou,Chao Liu,Yinming Fan,Lihao Zhang,Shen Tang,Shengpeng Mo,Yinian Zhu,Zongqiang Zhu
Biphasic solvents have been widely studied for CO 2 capture due to their remarkable energy-saving potentiality. However, most existing biphasic solvents suffer from the high viscosity of their CO 2 -rich phase. This study proposed a novel low-viscous secondary amine-based nonaqueous biphasic solvent for CO 2 capture. With dimethyl sulfoxide (DMSO) as the organic diluent and pentamethyldiethylenetriamine (PMDETA) as the phase splitting agent, the secondary amine of 2-methyl-ethynolamine (MAE) was proved to be the optimal candidate for preparing the biphasic solvent. The MAE/DMSO/PMDETA (M/D/P) biphasic solvent could realize a high CO 2 loading of 0.84 mol mol −1 and the viscosity of its CO 2 -rich phase was only 8.87 mPa s, which was significantly lower than that of most reported biphasic solvents. The reaction mechanism analysis revealed that M/D/P absorbed CO 2 to form products of protonated amines, carbamate, and carbamic acid species. Since the products were polar and showed a stronger affinity to polar DMSO, while less polar PMDETA was isolated, thereby resulting in a phase change. Thermodynamics analysis showed that the M/D/P biphasic solvent could sharply cut down the sensible heat and latent heat during CO 2 desorption. Eventually, the total regeneration energy penalty of M/D/P was significantly reduced by 46.3% compared with the benchmark aqueous MEA solution.
研究领域:
化学工程
·
环境科学
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Chunxiang Lin,Hao Yi,Ling Chen,Yifan Liu,Xiaoxia Ye,Yuancai Lv,Minghua Liu
A biphasic solvent system consisting of ionic liquids (IL) and petroleum ethers was applied in the extraction of Eucommia ulmoides gum (EUG) from pericarp . Effects of IL and extraction parameters on the yield and purity of EUG were investigated. The results showed that the addition of IL could enhance the yield and purity of EUG extracted from pericarp comparing with the traditional alike pretreatment method. FTIR, XRD and 1 H NMR characterization conformed the chemical structure of EUG. DSC analysis reviewed the partial destruction of crystal structure and the disappearance of β-crystal phase of EUG extracted by biphasic solvent system, resulting in the decrease of the melting point and increase of glass transition temperature. Moreover, the extracted EUG exhibited high tensile strength of 27.68 MPa, excellent elongation at break of 1069%, and thus high toughness of 181.45 MJ∙m −3 . Additionally, the excellent reusability of IL and petroleum ethers showed the extraction method of the biphasic solvent system promise as a feasible method to replace the traditional alkali pretreatment.
研究领域:
植物学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED ENERGY
·
2019
·
IF 8.426
Yao Shen,Han Chen,Junliang Wang,Shihan Zhang,Chenkai Jiang,Jiexu Ye,Lidong Wang,Jianmeng Chen
The CO 2 capture capabilities of amine-based biphasic solvents have been extensively investigated. However, the mechanism of CO 2 absorption into the biphasic solvents has not been adequately examined, even if it is very important for the solvent screening, composition optimization, efficiency improvement and heat duty reduction. In this work, a two-stage interaction mechanism is proposed through CO 2 absorption performance , 13 C nuclear magnetic resonance analysis, and quantum calculation. The experimental results and quantum calculation revealed that the shift of the absorption mechanism depended on the active amine group in the biphasic solvents. In the first stage, for a high concentration of the active amine group, a proton was transferred from zwitterion to tertiary amines with the primary amines as intermediates. The CO 2 absorption rate was controlled by reaction kinetics, which resulted in a high absorption rate and inconspicuous phase change. In the second stage, for a low concentration of the active amine group, the thermodynamics-controlled absorption rate decreased sharply (by 65.2% for 1,4-butanediamine/N,N-dimethylcyclohexylamine) because the proton transferred from zwitterion to tertiary amines directly. Kinetic analysis revealed that, with an increase in the temperature from 298 to 333 K, the reaction rate constants increased by 285–362% at the first stage. However, the equilibrium constants decreased by 17.7–21.3% at the second stage. Taking both the kinetics and energy penalty into account, the triethylenetetramine/N,N-dimethylcyclohexylamine solution with a lean loading of 0.4 mol mol −1 is promising to achieve the high absorption rate and low-energy consumption.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of CO2 Utilization
·
2018
·
IF 5.503
Qiushi Huang,Guohua Jing,Xiaobin Zhou,Bihong Lv,Zuoming Zhou
Due to its great potential of energy consumption saving, the biphasic solvent has attracted more and more attention. In the present work, an efficient absorbent of amino-functionalized ionic liquids (AFILs) was dissolved in ethanol-water solvent to form a novel biphasic solvent for CO 2 capture. When the concentration of triethylenetetramine l -lysine ([TETAH][Lys]) was 0.5 mol/L and the volume ratio of ethanol-water solvent was 4:6, the [TETAH][Lys] solution separated into two phases after CO 2 absorption. Under the optimal conditions, the volume of the CO 2 -rich phase was about one third of the total volume of the mixture, which meant that only one third of the solution needed to be regenerated and the energy consumption could be greatly reduced. Meanwhile, the loading of the CO 2 -rich phase contributed about 93% of the total loading of the solution, and its viscosity was only 27.95 mPa s. The regeneration efficiency of the solvent after the 5th absorption-desorption cycle still kept at 91.3%. Based on the experimental and 13 C NMR analysis results, the reaction and phase change mechanisms of CO 2 capture into the [TETAH][Lys]-ethanol-water solution were clarified. CO 2 absorption into [TETAH][Lys] firstly formed carbamate, which would further hydrolyze to HCO 3 − /CO 3 2− and react with ethanol to form the ethyl carbonate. Due to the limited solubility of these absorption products in ethanol, as well as the good solubility in H 2 O, the products transferred to the lower phase while the ethanol stayed in the upper phase in the biphasic system.
研究领域:
化学工程
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环境科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Dayu Sun,Panli Liu,Huijun Liu,Zhixiu Yang,Lijing Gao,Ruiping Wei,Xiaomei Pan,Guomin Xiao
Furfural, a promising biobased platform chemical, can be derived from xylan through an acid-catalyzed dehydration process. However, the yield of furfural in the aqueous phase is often limited by side reactions (furfural degradation). Employing a biphasic solvent system for in situ furfural extraction presents a strategy to mitigate furfural degradation as furfural is more stable in some organic phases, reducing the polymerization with reaction intermediates in the aqueous phase. In this study, a novel energy-efficient process was developed for the enhanced production of furfural from corncob xylan in a biphasic solvent system. A series of niobium-modified SBA-15 solid acid catalysts for furfural production were synthesized and characterized to determine the physical properties, structure, and crystallinity. The toluene/H2O biphasic system was selected to intensify the furfural production and reduce subsequent separation costs. The experimental parameters including niobium doping of catalyst, reaction time, reaction temperature, catalyst input, and xylan input were optimized to obtain high furfural yield. The process model for production and purification of furfural was established based on experimental data, and the results demonstrated that the furfural purification section in the proposed process reduced cold energy consumption by 64.08% and heat energy consumption by 70.29% compared to the conventional process.
研究领域:
生物化学
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催化化学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
Waste and Biomass Valorization
·
2016
·Vol. 8
·期 4
·1303-1311
·
IF 0.915
Wei W. Q.,Wu S. B.
Conversion of eucalyptus cellulose into 5-hydroxymethylfurfural (5-HMF) by using Lewis acid catalyst in biphasic system was investigated in this study. The results show that the tetrahydrofuran/water biphasic system was more conducive to convert the eucalyptus cellulose into 5-HMF comparing to the single aqueous system. InCl 3 , a water-compatible Lewis acid, has the best catalytic effect. The highest yield of 5-HMF from eucalyptus cellulose is up to 45.05 mol%, which is a slight higher than that from microcrystalline cellulose. It can be ascribed to the lower crystallinity of isolated eucalyptus cellulose. The optimum conditions for catalytic conversion of eucalyptus cellulose into 5-HMF are at 200 °C for 2 h with 10 % InCl 3 dosage. Additionally, the effect of recycling the whole biphasic system which contains InCl 3 , NaCl, H 2 O and THF indicated that the 5-HMF yield was gradually decreased as the cycle times increased, the possible reason could be due to the loss of partial InCl 3 catalyst during the separation and distillation process.
研究领域:
化学工程
·
可再生资源与环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
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
·
催化材料
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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
·
2024
·
IF 8.1
Xiaobin Zhou,Ting Zou,Dan Wang,Zhifang Tu,Yinming Fan,Jianwen Wei,Lei Liao,Zongqiang Zhu,Yinian Zhu,Dunqiu Wang,Guohua Jing
Solid-liquid biphasic solvents (SLBSs) hold promise as energy-efficient candidates for CO 2 capture. Nevertheless, the premature phase transition of current SLBSs leads to inopportune solid precipitation, posing operational challenges for the CO 2 capture system. This study proposed a promising strategy that using aminoethylethanolamine (AEEA) as a regulator to fine-tune the phase transition time node of the 2-amino-2-methyl-1-propanol (AMP)/N-methylpyrrolidone (NMP) SLBS, enabling the phase transition to occur precisely as desired. Experimental results showed that the AEEA/AMP/NMP (A/A/N) SLBS exhibited tunable phase transition time nodes, modulated by the concentration of AEEA. Specifically, with the addition of 0.2 mol·L −1 AEEA, the CO 2 loading associated with the phase transition increased significantly, from 0.19 to 0.54 mol·mol −1 , approaching the saturation loading of 0.57 mol·mol −1 . The delayed phase transition would facilitate the CO 2 absorption operation. The regulatory mechanism of AEEA on the phase transition were thoroughly studied via 13 C NMR and quantum calculations. AMP reacted with CO 2 to produce AMPCOO − and AMPH + , which had a significantly stronger affinity for each other than for the solvent NMP, mediated by strong hydrogen bond interactions. Consequently, the continuous and fast aggregation of AMPCOO − and AMPH + caused their swift precipitation from NMP. With the introduction of AEEA, the derived product AEEAH + (S) COO – (P) acted as a bridge-builder, connecting AMPCOO − or AMPH + and NMP via hydrogen bonds, increasing the solubility of the AMP-derived products in NMP, thus effectively delaying the phase transition. Thermodynamic analysis revealed that the A/A/N SLBS exhibited a total regeneration energy consumption of 1.94 GJ·ton −1 CO 2 , representing a significant reduction of 48.9 % compared to that of 30 wt% MEA. This study provided a novel idea for designing SLBSs with controllable phase transition behavior, and offered a promising A/A/N SLBS for energy-efficient CO 2 capture.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2023
·
IF 9
Xiaobin Zhou,Chao Liu,Jie Zhang,Yinming Fan,Yinian Zhu,Lihao Zhang,Shen Tang,Shengpeng Mo,Hongxiang Zhu,Zongqiang Zhu
Biphasic solvents are regarded as promising candidates for CO 2 capture but still suffer from the deficiency of inferior regenerability, which negatively affects their energy-saving potential. 2-Amino-2-methyl-1-propanol (AMP)-based absorbents have superior regenerability but poor phase-change performance. In this study, an effective strategy that using tetraethylenepentamine (TEPA) to regulate the phase change behavior of an AMP-pentamethyldiethylenetriamine (PMDETA) aqueous solution was proposed, aiming to develop a novel AMP-PMDETA-TEPA (A-P-T) biphasic solvent with good regenerability and excellent phase separation performance. The A-P-T biphasic solvent could realize a high CO 2 loading of 0.73 mol mol −1 and a high desorption efficiency of 75.3%. Its sensible heat requirement significantly decreased to 0.14 GJ·ton −1 CO 2 , 78.1% less than the monoethanolamine solution. The 13 C NMR characterization and quantum chemistry calculations indicated that with the introduction of TEPA, high polar TEPA-associated products were generated, which broke the original assimilation state of the A-P-T system and drove it to undergo phase change. Since the TEPA-associated products had a strong affinity to other CO 2 -captured products and H 2 O, they gathered together to form the CO 2 -rich phase. In contrast, less polar PMDETA showed a relatively weak affinity to the TEPA-associated products and was solely separated from the solution to form the CO 2 -lean phase.
研究领域:
化学工程
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环境科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Greenhouse Gas Control
·
2021
·
IF 3.738
Qiangwei Li,Ge Gao,Rujie Wang,Shihan Zhang,Shanlong An,Lidong Wang
Biphasic solvents are promising candidates for CO 2 capture for low regeneration energy consumption. In this study, a novel phase splitter 1-methylimidazole (1-MI) was proposed for triethylenetetramine (TETA) aqueous solvent. 1-MI was proved to act as a phase splitter to induce the phase separation and as an absorption promoter to enhance the absorption rate. By tuning the concentrations of TETA and 1-MI, good phase separation performance was obtained in TETA-1-MI biphasic solvent, achieving a CO 2 -rich phase loading of 5.41 mol/L. 13 C NMR revealed that the upper layer was the CO 2 -lean phase, containing 1-MI and a small amount of water, while the lower layer was the CO 2 -rich phase and mainly comprised of TETAH + and TETA-carbamate. The kinetics results based on the double-film theory indicated that the CO 2 absorption rate was mainly controlled by the gas film mass transfer resistance at lower CO 2 loading and then by liquid film mass transfer resistance when CO 2 loading was higher than 1 mol/L. Owing to the good phase separation behavior triggered by 1-MI, the regeneration heat of TETA-1-MI was 2.26 GJ/t CO 2 , which was comparable to that of the second-generation solvents, and 43.5 % lower than that of 5 M monoethanolamine (MEA). The present findings indicated that TETA-1-MI had a large loading capacity, high absorption rate, and low energy consumption, which can serve as a novel candidate for CO 2 capture.
研究领域:
化学工程
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环境科学
·
碳捕集技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）