Greenhouse Gases-Science and Technology
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2021
·Vol. 11
·期 5
·974-987
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IF 2.013
Shunji Kang,Zhi Shen,Xizhou Shen,Liuya Fang,Li Xiang,Wenze Yang
The carbon dioxide discharged from fossil fuels combustion products is considered as a major contributor to global warming. The current investigation aimed at CO 2 desorption kinetics in 3.25 mol L –1 methyldiethanolamine (MDEA)–0.1 mol L –1 piperazine (PZ) rich amine aqueous solution with thermo-gravimetric analysis (TGA) method under different heating rates of 2.5, 5, 10, and 20 °C min –1 . The kinetics parameters were determined by comparison of 40 mechanism functions with thermal analysis kinetic method. The average activation energy E was 59.16 kJ mol –1 , preexponential factor A was 5.54 × 10 8 , and the most probable mechanism function was G( α ) = [–ln(1 – α )] 3/2 . In addition, the kinetic parameters of CO 2 desorption process from three rich amine aqueous solutions (MDEA, MDEA + diethanolamine(DEA), MDEA + PZ) were compared and the influence of kinetic parameters was further discussed. The desorption rate models of three rich amine aqueous solutions were established and desorption rates were well predicted. The order of desorption rate inferred from desorption rate model was MDEA > MDEA + DEA > MDEA + PZ. The results indicated that TGA combined with thermal analysis kinetics was an effective and quick method with high accuracy, easy operation, and good repeatability for screening absorbents preliminarily in laboratory. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.
研究领域:
化学工程
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环境科学
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热分析
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DOI
高影响因子
International Journal of Greenhouse Gas Control
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2020
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IF 3.639
Kang Shunji,Shen Xizhou,Yang Wenze
In this paper, by means of thermo-gravimetric analysis(TGA), the desorption kinetics of CO 2 absorbed in two kinds of rich amine solutions, MDEA (3.25mol/L) and MDEA+DEA(3.25mol/L-0.3mol/L), were investigated under different heating rates(2.5℃/min, 5℃/min, 10℃/min and 20℃/min). The thermal analysis kinetics was applied to analyze the TG-DTG curves of two rich amine solutions so as to research CO 2 desorption kinetics. In addition, the CO 2 desorption kinetics parameters have been calculated with model-free method Flynn-Wall-Ozawa (FWO) and model-fitting method Coats-Redfern (CR). The results indicated that CO 2 desorption process could be divided into two stages. The CO 2 and H 2 O were released with non-uniform speed in the first stage and MDEA or DEA with higher boiling points were evaporated in the second stage. For MDEA solution the average activation energy E was 50.36kJ/mol, the pre-exponential factor A was 1.68×10 7 , and the most probable integral mechanism function was G α = α 3 / 2 . For MDEA+DEA solution the average activation energy E was 59.68kJ/mol, the pre-exponential factor A was 2.22×10 7 , and the most probable integral mechanism function was G α = [ ( 1 + α ) 1 / 3 − 1 ] 2 . The technical feasibility of CO 2 desorption performance in rich amine solutions with thermo-gravimetric analysis method was demonstrated.
研究领域:
化学工程
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环境科学
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高影响因子
Chemical Engineering and Processing-Process Intensification
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2024
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IF 3.8
Lingyu Xiao,Zhoujie Qiu,Shuo Feng,Xiaoxu Duan,Zhisheng Zhao,Yongcong Liu,Liang Ma
The global climate change problem has brought much attention to CO 2 capture technology. N-methyldiethanolamine (MDEA), as an efficient and environmentally friendly absorbent, is widely used in CO 2 capture. However, it is difficult for a single MDEA to meet the demand for efficient absorption and desorption under certain conditions, so the addition of promoters to improve its performance has become a hot research topic. The aim of this study is to deeply investigate the effects of different accelerators on the absorption and desorption of CO 2 by MDEA. Experiments were conducted to measure the absorption capacity of the MDEA compound solution for CO 2 in a bubbling reactor at 30°C and to evaluate its desorption effect in a desorption system at 90°C. The experimental results showed that increasing the promoter concentration in the MDEA-based absorbent solution significantly enhanced the absorption capacity and circulation capacity. However, in terms of desorption efficiency, the added concentrations of MEA and DEA were negatively correlated with the desorption efficiency. Notably, the addition of 0.1 mol/L DEA significantly enhanced the desorption efficiency by 16% compared with MDEA.
研究领域:
环境科学
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化学工程
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高影响因子
ENERGY
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2018
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IF 4.968
Pan Zhang,XiangFeng Tian,Dong Fu
A tray tower was designed to verify the absorption performance of CO 2 in 1-butyl-3-methylimidazolium glycinate ([Bmim][Gly]), 1-butyl-3-methylimidazolium lysinate ([Bmim][Lys]) and tetramethylammonium glycinate ([N 1111 ][Gly]) activated MDEA ( N -methyldiethanolamine) aqueous solutions. The simulated flue gas was composed of 15% (mole fraction) CO 2 and 85% N 2 and the experiments were performed at 313.2 K. To find a suitable absorbent composition, the mass fractions of MDEA and amino acid ionic liquids (AAILs) respectively ranged from 0.200 to 0.400 and 0.025 to 0.100. The removal efficiency of CO 2 ( η CO 2 ) and the overall volumetric mass transfer coefficient ( K G a v ) were determined. The effects of absorbent composition ( w ), absorbent flow rate ( L ), gas flow rate ( G ) and plate number ( N p ) on η CO 2 and K G a v were demonstrated. Our results showed that, when activated by AAILs, MDEA aqueous solution was able to absorb CO 2 in tray tower efficiently, and both η CO 2 and K G a v were significantly increased, e.g., in the case of w MDEA = 0.200, η CO 2 and K G a v were increased from 43.48% to 95.55% and from 0.0069 (kmol m −3 h −1 ·kPa −1 ) to 0.0350 (kmol m −3 h −1 ·kPa −1 ), respectively, when w [N1111][Gly] was changed from 0 to 0.100, indicating AAILs activated MDEA aqueous solution is of great potential for industrial application in CO 2 capture process.
研究领域:
化学工程
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环境科学
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高影响因子
ENERGY
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2016
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IF 4.292
Dong Fu,Pan Zhang,ChenLu Mi
The absorption of CO 2 in tetramethylammonium glycinate ([N 1111 ][Gly]) promotedMDEA (methyldiethanolamine) aqueous solution was investigated. The temperature ranged from 303.2 K to 323.2 K. The mass fractions of MDEA and [N 1111 ][Gly] respectively ranged from 0.3 to 0.45 and 0.05 to 0.15. The influences of temperature and concentration on the absorption capacity of CO 2 were determined. The viscosities of CO 2 -unloaded and CO 2 -loaded MDEA-[N 1111 ][Gly] aqueous solutions were measured and correlated. The experiments showed that the absorption rate of CO 2 obviously increased when the MDEA aqueous solution was promoted by [N 1111 ][Gly]. The effects of temperature, concentration and solution viscosity on the absorption rate were illustrated.
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
ENERGY & FUELS
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2022
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IF 4.654
Liangkun Hou,Yingying Liu,Kejing Wu,Yingming Zhu,Houfang Lu,Bin Liang
The acid-catalyzed desorption of the MDEA CO2-rich liquid under the electrochemical reaction can lower the desorption temperature, thereby reducing the energy consumption for regeneration. In this work, disodium 4,5-dihydroxy-1,3-benzenedisulfonate (tiron) was used as an acidic medium for the electrocatalytic regeneration of the MDEA CO2-rich solution. The results show that the CO2 desorption efficiency reaches more than 90% at 25 °C for the 0.3 M MDEA (0.1 M tiron) system. At 50 °C, compared with 3 M MDEA (without tiron), the maximum CO2 desorption rate and desorption efficiency of the 3 M MDEA (with 0.1 M tiron) CO2-rich solution increased by 27.4 and 18.3%, respectively. Elevating the temperature can increase the quantity of CO2 desorption and the degree of MDEAH+ deprotonation as well as the reactivity of tiron on the electrode, so the desorption rate of CO2 can be further improved by the oxidation of tiron releasing H+ in coordination with thermal desorption.
研究领域:
化学工程
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环境科学
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电化学
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高影响因子
ENVIRONMENTAL TECHNOLOGY
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2022
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IF 3.475
Jun Zhao,ZongJian Liu,Lin Zhang,Qun Cui,HaiYan Wang
In order to the intensification of gas–liquid mass transfer of MDEA-containing wastewater during wet air oxidation (WAO) process, the microbubbles and millimetre bubbles were applied by fine-pore sparger (5 and 20–30 μm) and single pore sparger (6.35 mm), respectively. Effect of the superficial gas velocity on the average microbubble size, gas holdup and oxygen mass transfer coefficient (KLa) of MDEA-containing wastewater at the ambient conditions was studied. The results showed that the microbubbles (less than 1 mm) were beneficial to enhance mass transfer process and had a higher dissolved oxygen concentration during WAO process of MDEA-containing wastewater owing to higher gas holdup and larger oxygen mass transfer coefficient. The COD removal ratio was 66% at low superficial gas velocity (ug = 0.3 cm/s) in WAO process by microbubbles, while it achieved at high superficial gas velocity (ug = 3.0 cm/s) by millimetre bubbles. The critical oxygen mass transfer coefficient KLa was 0.183 min−1 of MDEA-containing wastewater by 20–30 and 5 μm fine pore sparger, which was 2∼5 times more than that of single pore sparger (<0.1 min−1). The microbubbles could improve dissolved oxygen concentration and enhance the formation of hydroxyl radical at short time with atmospheric pressure. During the WAO process, the MDEA would be converted into intermediates including formic acid, acetic acid, ammonium, nitrite and nitrate. The WAO process with microbubbles could significantly improve the gas–liquid mass transfer performance at low superficial gas velocity and greatly reduce air consumption for MDEA-containing wastewater.
研究领域:
环境工程
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化学工程
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DOI
PubMed
高影响因子
Chemical Engineering and Processing-Process Intensification
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2021
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IF 4.237
Jun Zhao,Yuan Wei,ZongJian Liu,Lin Zhang,Qun Cui,HaiYan Wang
High concentration N-methyldiethanolamine (MDEA)-containing wastewater with strong alkaline, high chemical oxygen demand (COD), and toxic organics, cannot be directly treated by biochemical process. In this paper, effect of operation parameters (temperature, reaction pressure and residence time) on removal ratio of COD and MDEA was investigated by catalytic wet air oxidation (CWAO) over commercial activated carbon (AC). The degradation pathway of MDEA in the CWAO was proposed. The results showed that the concentration of MDEA, COD, total organic carbon (TOC), and total nitrogen (TN) were 18.92, 61.2, 21.34 and 5.65 g·L −1 , respectively. The contribution rate of MDEA concentration to COD in the wastewater reached up to 89.8%. The removal ratio of MDEA and COD exceeded 98% and ∼90% at temperature of 230 °C, reaction pressure of 5.0 MPa and residence time of 90 min for 168 h continuous running, respectively. The surface carboxylic acid groups of AC played a key role in the formation of hydroxyl radicals (·OH), due to the O 2 was adsorbed by the carboxyl groups on the surface of AC to form ·OH, and the ·OH then attacked the C N bond of the MDEA to generate other intermediate products, and then these intermediate products was further oxidized to NH 4 + , CO 2 and H 2 O. This work provides a promising pretreatment technology of high concentration MDEA-containing wastewater.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
Journal of CO2 Utilization
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2021
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IF 7.132
Qin Ying,Han Chen,Peijing Shao,Xiaowei Zhou,Xiaojia He,Jiexu Ye,Shihan Zhang,Jianmeng Chen,Lidong Wang
Tertiary amine-based absorption process possesses high absorption capacity and low heat duty for CO 2 capture. However, its slow CO 2 absorption rate retards its industrial application. This work developed a core-shell magnetic ZIF-8@Fe 3 O 4 -carbonic anhydrase composite to promote CO 2 absorption into tertiary amine, e.g., diethanolamine (MDEA) due to its easy recovery from the solution. The catalytic performance of CA@ZIF-8@Fe 3 O 4 that had three particle sizes were investigated. Experimental results revealed that the obtained CA@ZIF-8@Fe 3 O 4 can achieve the relative activity as high as 95.2 % compared with the free counterparts. Large particle size of ZIF-8@Fe 3 O 4 was beneficial to activity but adverse to loading. Magnetic analysis shows that the developed CA@ZIF-8@Fe 3 O 4 possessed remarkable magnetic response which made recycling more convenient.
研究领域:
化学工程
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环境科学
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生物技术
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高影响因子
Greenhouse Gases-Science and Technology
·
2022
·Vol. 12
·期 6
·738-750
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IF 2.518
Jian Liu,Chengdong Kong,Liu Yang,Xiaojiang Wu,Zhongxiao Zhang
In this study, the mass transfer enhancement by nanoparticles during CO 2 absorption process with MDEA solution in a randomly packed tower was investigated. The mass transfer performance of MDEA solution with and without nanoparticles were quantified and analyzed in terms of the volumetric overall mass transfer coefficient ( K G a v ). An enhancement factor ( E ), defined as the ratio of K G a v with and without nanoparticles, was further introduced to evaluate the enhancement effect of the addition of nanoparticles. The effects of TiO 2 nanoparticle concentration, MDEA concentration, liquid flow rate, liquid temperature, inert gas flow rate, and CO 2 loading on K G a v and E were systematically studied in the packed tower. It is found that the maximum value of E can reach 1.37, when the nanoparticle concentration is 0.09 wt %, the liquid flow rate is 21.22 m 3 /m 2 ·h, the liquid temperature is 27°C, the MDEA concentration is 30%, the gas flow rate is 7.58 kmol/m 2 ·h and the CO 2 loading is 0.2 mol CO 2 /mol MDEA. Usually, the K G a v of the MDEA nanofluids can be increased by 10–37% in a randomly packed tower compared to that of the MDEA solution, which is consistent with the results from the bubbling reactors. However, when the CO 2 loading of absorption exceeds 50%, E becomes less than 1.0, which means that high CO 2 loading inhibits the enhancement effect of nanoparticles. In order to predict the mass transfer performance of MDEA nanofluid, a formula correlating E and various dimensionless operating parameters (i.e. L ̂ $\hat{L}$ , T ̂ $\hat{T}$ , C ̂ nf ${\hat{C}}_{{\rm{nf}}}$ and C ̂ MDEA ${\hat{C}}_{{\rm{MDEA}}}$ ) is proposed and fitted with an average absolute deviation of 14%. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.
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
ACS Omega
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2025
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IF 4.3
Liang Ma,Yuting Zhang,Anlin Liu,Zhisheng Zhao,Liwang Wang,Yulong Chang,Xiaoxu Duan,Peng Gao
Hydrogen sulfide (H2S) is an extremely noxious impurity generated from industrial processes, but conventional absorption devices applied to remove H2S are often constrained by low mass transfer coefficients and large equipment volume. To overcome these limitations, we propose a novel high-jet oscillating purifier (HOP) and systematically investigate the key operational parameters that influence desulfurization performance when HOP is combined with a methyl diethanolamine (MDEA) solution. Experimental results demonstrated that H2S removal efficiency and mass transfer coefficients increased with absorption flow rate (0.06–0.12 m3/h), methyl diethanolamine concentration (0.8–3.2 wt %), and inlet H2S concentration (20–160 mg/m3), but decreased with methyl diethanolamine solution temperature (25–85 °C). Intriguingly, inlet gas flow rates (5 and 17 m3/h) improved removal efficiency but reduced mass transfer coefficients. Radial injection (α = 0°) of absorption liquid achieved optimal performance, yielding peak efficiency at 98.7%, surpassing nonradial injection (α = ±45°) by 12.3–15.8%. The mass transfer coefficients (KGa) at 0.0715 kmol·m–3·kPa–1·s–1, are about ten times higher than conventional devices. Semiempiric equation (R2 = 0.99, p < 0.001) was derived to predict KGa across operational conditions. The industrial application indicated that HOP achieved an average removal efficiency higher than 95.1% with only 1/8 of the device volume compared to conventional scrubbers. The study indicates that HOP combined with MDEA solution has great potential for application in removing H2S for industrial plants.
研究领域:
化学工程
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环境工程
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气体净化
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工业污染控制
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DOI
PubMed
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
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2019
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IF 1.354
Mei Wang,Na Rao,Yuqing Liu,Jiale Li,Qunpeng Cheng,Jianfen Li
TETA or TETA-AEP mixtures were used as an activator to enhance CO2 capture in the MDEA solution. The effect of amount and type of activators, and the viscosity of absorbents on CO2 capture were discussed. The results showed that the positive effect of TETA-AEP mixtures on CO2 capture in the MDEA solution was greater than that of TETA. The optimal absorbent was No. V, whose CO2 absorption capacity/desorption efficiency was 3.08 times/1.18 times of No. І. The viscosity had a little influence on CO2 absorption and an obvious effect on CO2 desorption.
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
危险品化学品经营许可证（带存储）