SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Ge Gao,Wufeng Jiang,Xiaoshan Li,Zhenghong Zhao,Cong Jiang,Cong Luo,Fan Wu,Liqi Zhang
Energy consumption is one of the crucial factors in determining the suitability of the chemical absorbents for capturing carbon dioxide (CO 2 ). Polyamines have attracted increasing attention in recent years because of the existence of several amino functional groups that could effectively capture CO 2 in their molecules. In this work, the structures of seven polyamines with excellent CO 2 capture performance were investigated in relation to reaction rate and the CO 2 absorption heat. A high-precision microcalorimeter was applied to analyze the absorption heat of CO 2 directly, and a parameter defined as the CO 2 quasi-cycle capacity was employed to assess the cyclic capture capacity of CO 2 , absorption rate, and desorption rate. Experimental results revealed that for the selected polyamines, the increase in the ratio of the secondary amino functional group to the primary-one in the molecule leads to a decrease in the CO 2 absorption heat and an increase in the CO 2 cyclic capacity.The ΔH abs of the eight amines give out the order of HMDA (92.22 kJ/mol) > MAPA(90.91 kJ/mol) > AEEA (87.62 kJ/mol) > MEA (86.36 kJ/mol) > TEPA (82.95 k/mol) > AEP (82.36 kJ/mol) > 2MPRZ (77.08 kJ/mol) > PZ (74.41 kJ/mol). The CO 2 quasi-cycle capacity of 2MPZR is about twice that of the MEA. In addition, 2MPRZ was found to be an absorbent with phase change potential. The effective phase change solvent system, 2MPRZ + Triethylene glycol monobutyl ether (TGBE) + H 2 O, was developed in this work. Compared to the 5 M MEA aqueous solution, its sensible heat was reduced by 56.3 %, indicating that 2MPRZ is a promising absorbent.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
International Journal of Greenhouse Gas Control
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2014
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IF 3.821
Zhicheng Xu,Shujuan Wang,Guojie Qi,Anastasia A. Trollebø,Hallvard F. Svendsen,Changhe Chen
The carbon dioxide (CO 2 ) solubility in aqueous 2-(diethylamino)-ethanol (DEEA) solutions were measured at (60 and 80 °C), with the DEEA concentrations of 3 M and 4 M and pressure range of (3 to 192 kPa). The absorption heat of CO 2 with (1, 3, and 4 M) aqueous DEEA solutions at different temperatures is also presented in this work. A thermodynamic model based on the electrolyte non-random two-liquid (eNRTL) theory within Aspen Plus ® has been developed to correlate and predict the vapor liquid equilibrium and heat of absorption of CO 2 in aqueous DEEA solutions. Meanwhile, the speciation of the solution at different loadings was also predicted using the developed eNRTL model.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
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IF 2.567
Rui Zhang,Xiao Luo,Qi Yang,Fan Cao,Shupanxiang Chen,Zhiwu Liang
This work has investigated CO2 absorption using 3-(diethylamino)propylamine (DEAPA), a diamine that contains one primary and one tertiary amine in the same molecule. The results are compared with those for the blended amine system of monoethanolamine and methyldiethanolamine (MEA–MDEA), a mixed amine solvent with an equal number of moles of primary and tertiary amine. The 2 M DEAPA, 2 M MEA, and 4 M MEA–MDEA (1:1 mole ratio) were tested for their CO2 absorption performance. The experimental results show that the intramolecular tertiary amino group of DEAPA can promote the CO2 absorption rate of the intramolecular primary amino group and enhance its CO2 absorption capacity. The results using 13C nuclear magnetic resonance also showed that the intermolecular tertiary amine in the MEA–MDEA system was more favored for the promotion of the primary amine in the blend to form bicarbonate at an earlier CO2 equivalent loading stage and produced less carbamate than the intramolecular tertiary amino group of DEAPA did with respect to its primary amine. Furthermore, the CO2 equilibrium solubility of DEAPA was measured at different temperatures with various CO2 partial pressures, and then an empirical model based on these experimental data was developed. The results predicted by this model were fitted well with the experimental results. The Gibbs–Helmholtz equation was used to estimate the CO2 absorption heat of the DEAPA system, and the results showed that DEAPA has a CO2 absorption heat (−36.4 kJ/mol) lower than those of MEA, MDEA, and DEA. The results demonstrate that DEAPA has the potential to be an alternative solvent with a high absorption rate, a high CO2 capacity, and a low heat of absorption in CO2 capture processes.
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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2019
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IF 2.29
Lemeng Wang,Xiangfeng Tian,Dong Fu,Xiaoqian Du,Junhong Ye
Experimental data of CO 2 absorption capacity for high concentrated 1-dimethylamino-2-propanol (DMA2P)–monoethanolamine (MEA) aqueous blends are presented under atmospheric pressure in a temperature range of 303.2–323.2 K, at different mass fractions of DMA2P (30 wt%–50 wt%) and MEA (5 wt%–15 wt%). The mass fraction and temperature dependences of the absorption capacity are illustrated. The addition of small amount of MEA into DMA2P aqueous solution leads to an obvious increase in the absorption rate of CO 2 . However, the absorption rate increases not so significantly when w MEA is of high value. Moreover, the temperature affects the absorption rate not so significantly as compared to solution concentration. The CO 2 absorption heat of DMA2P-MEA based on the Gibbs-Helmholtz equation was found to be −55.0 kJ/mol. Besides, the viscosities of both CO 2 -unloaded and CO 2 -loaded aqueous solutions were measured and modeled in a temperature range of 303.2–323.2 K, and in atmospheric pressure. The effects of temperature, composition and CO 2 loading on viscosities were demonstrated. The Weiland equation gave a good prediction with an average relative deviation of 2.42%. Moreover, the activation energy ( E a) was estimated based on the viscosity.
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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2017
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IF 2.726
Yue Zhao,Shufeng Shen,Yangyang Bian,Ya-nan Yang,Ujjal Ghosh
In this work, CO 2 solubility in aqueous potassium lysinate solutions has been measured for the concentrations of (1.25–3.28) mol·kg −1 and at temperatures of (313–343) K. The vapour-liquid equilibrium data were correlated using a Soft model and a semi-empirical (SE) model. The proposed models can match well with the experimental data with AAD within 20%. The heat of absorption for LysK was estimated as about (55–70) kJ·mol −1 CO 2 absorbed from the solubility data. The lower heat of absorption, compared with that of 30 mass% MEA, will be beneficial for the reduction of regeneration energy.
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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2024
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IF 13.3
Xi Tang,Bin Xu,Wufeng Jiang,Xiaoshan Li,Ge Gao,Fan Wu,Cong Luo,Liqi Zhang
Piperazine (PZ) derivatives which have been widely used in CO 2 capture technology exhibit stable physicochemical properties, such as resistance to thermal degradation and low regeneration energy consumption. Both two parameters of CO 2 absorbents, low CO 2 absorption heat (ΔH abs ) and large CO 2 equilibrium solubility (α e ), are important to CO 2 capture performance. However, the influence of functional group types of PZ derivatives on their CO 2 capture performance remained unclear. This research aimed to study the functional group influence on the ΔH abs and α e by PZ derivatives with two amines using experimental and quantum chemical methods. The results indicated that PZ derivatives with the ethyl side chain had larger ΔH abs and α e than those with the methyl side chain. The presence of the hydroxy group in PZ derivatives reduced the ΔH abs and the α e . The presence of cyclic methyl side chains on the N atom of PZ derivatives decreased the ΔH abs and increased α e at the same time. The findings show that PZ derivatives with cyclic methyl side chains, steric hindrance effect, and no hydroxy group are favorable for CO 2 capture. Among the eight PZ derivatives, TEDA with lower ΔH abs (48.99 kJ/mol) and higher α e (0.917 mol CO 2 /mol amine) is an excellent absorbent. The results of this study are very important for screening efficient and low-energy consumption absorbents for CO 2 capture.
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
Xi Tang,Ge Gao,Wufeng Jiang,Bin Xu,Fan Wu,Cong Luo,Xiaoshan Li,Liqi Zhang
Chain diamines, exhibiting favorable CO 2 capture properties, including a large absorption capacity and a high absorption rate, have been extensively utilized in CO 2 capture technology. It has been demonstrated that the molecular structure of chain diamines has an impact on CO 2 absorption properties. The importance of absorption heat as a main component of regeneration energy consumption can not be ignored. However, the influence of the chain diamine molecular structure on CO 2 absorption heat remained unclear. In this study, twelve chain diamines were examined to investigate their structure–activity relationship with CO 2 absorption heat. The results indicated that chain diamines with a high percentage of secondary or tertiary amino groups had a low CO 2 absorption heat. Chain diamines with methyl groups on tertiary amino groups demonstrated a diminished CO 2 absorption heat than those with ethyl groups. Compared to amino types and methyl/ethyl groups, chain lengths had a slight effect on the CO 2 absorption heat of chain diamines. Chain diamines containing two carbon atoms exhibited a slightly low CO 2 absorption heat. Furthermore, it was observed that TMDEA, with two tertiary amino groups, exhibited a high CO 2 equilibrium solubility (0.98 mol CO 2 /mol amine) and a low CO 2 absorption heat (57.52 kJ/mol). The findings of this work are of significant relevance for the screening and development of low energy-consuming chain diamines suitable for CO 2 capture industrial applications.
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
ENERGY & FUELS
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2022
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IF 4.654
Xianhang Jin,Enze Ren,Yun Yang
Nonaqueous absorbents for CO2 capture have attracted great attention in research institutes recently because of their many advantages, such as energy efficiency and noncorrosiveness. Novel nonaqueous single-phase and biphasic absorbents have been developed. In this work, to satisfy application requirements, the effects of solvents on nonaqueous absorbents’ phase separation behavior and CO2 solubility were clarified. The nonaqueous absorbents comprising MEA and 26 kinds of solvents were investigated. The phase separation behavior after CO2 absorption, CO2 solubility, and CO2 cyclic capacity of nonaqueous absorbents were studied. The solvent polarity parameter ET(30) and the dielectric constant of solvents mainly affected the phase separation behavior and CO2 solubility of nonaqueous absorbents, respectively. The nonaqueous absorbent comprising a solvent with an ET(30) value larger than 50 kcal/mol maintained a single phase after CO2 absorption. The CO2 solubility of nonaqueous absorbents had a good positive relation with the dielectric constant of solvents. Moreover, nonaqueous absorbents comprising ethylene glycol monoethyl ether exhibited the optimal CO2 cyclic capacity and heat of CO2 absorption. In comparison to 30% MEA/H2O, the CO2 cyclic capacity of the nonaqueous absorbent increased by 51.8%, and the heat of CO2 absorption decreased by 35.4%.
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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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2025
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IF 2.1
Yufan Yang,Muran He,Yichan Zhang,Chunting Zhou,Chunhuan Luo
The cis-1-chloro-3,3,3-trifluoropropene (R1233zd(Z)) and tetraethylene glycol dimethyl ether (TEGDME) system has been proposed in this study as a potential alternative absorption working pair. The vapor pressure, density, viscosity, and specific heat capacity of the R1233zd(Z)/TEGDME system were measured systematically. The mixing enthalpy and specific enthalpy were calculated by the NRTL model. Regression equations for the measured values were obtained by a least-squares method. Compared with the LiBr/H2O system, the generation temperature of the R1233zd(Z)/TEGDME system is reduced by 12 °C and the viscosity by about 50%. R1233zd(Z)/TEGDME has strong practical application significance in the absorption heat pump system.
研究领域:
化学工程
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热力学
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制冷技术
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2018
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IF 1.712
Yangyang Bian,Shufeng Shen
Phase change solvents are attractive energy-efficient absorbents for carbon dioxide (CO 2 ) capture due to CO 2 -rich phase formation. Potassium prolinate + water + ethanol (ProK/W/Eth) solution has shown good capture characteristics as a promising one in our previous work. In this work, absorption rate of CO 2 , solubility of N 2 O, and heat of absorption for ProK/W/Eth solution were investigated using a stirred cell reactor and a CPA201 reaction calorimeter and these results were also compared with the aqueous ProK and 30 mass% MEA solutions. Using ethanol as a solvent can substantially increase the CO 2 physical solubility and the absorption rate of CO 2 in ProK/W/Eth solutions is far higher than that in aqueous 30 mass% MEA solutions especially at a low CO 2 loading range. Solid precipitation, obtained from the liquid-to-solid phase change absorption, was analyzed by 13 C NMR and DSC-TGA. The enthalpy change for ProK/W/Eth solutions at various CO 2 loading was also discussed.
研究领域:
化学工程
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环境科学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）