ENERGY & FUELS
·
2020
·
IF 3.421
Xuefei Li,Dong Feng,Muyuan Chai,Shengchao Xu,Ammar Mohammedomar,Wenbo Zhao
Removal of sulfur dioxide (SO2) from flue gas by developing a highly efficient phase-change absorption solution is an effective way to tackle increasingly serious air pollution problems. In this study, the phase-change absorption behaviors of SO2 by using low cost 2-(diethylamino)ethanol (DEEA)/hexadecane as absorbent/solvent was systematically studied. The homogeneous solution could be facilely and quickly changed into two immiscible liquid phases upon introducing low partial pressure SO2. The liquid–liquid phase-change phenomenon was attributed to the formation of zwitterionic product by the reaction of DEEA with SO2, which was insoluble in low polarity hexadecane. Specifically, the absorption capacity of DEEA toward SO2 under 20 °C could reach 0.51 and 1.56 g of SO2/g of DEEA at 0.02 and 1 atm, respectively, which exhibited front-rank absorption capacity to most reported works. In addition, it was suggested that the present absorbent exhibited a highly selective absorption property and high removal efficiency of SO2. The well-matched absorbent/solvent phase-change system holds a promising application in the treatment of industrial flue gases.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
AICHE JOURNAL
·
2015
·Vol. 61
·期 6
·2028-2034
·
IF 2.748
Kaihong Chen,Wenjun Lin,Xini Yu,Xiaoyan Luo,Fang Ding,Xi He,Haoran Li,Congmin Wang
Five kinds of anion-functionalized ionic liquids (ILs) with different basicity and substituent were selected, prepared and applied in the capture of SO 2 from flue gas, where the concentration of SO 2 is only 2000 ppm. The effect of the anion on SO 2 absorption capacity, desorption residue, and available absorption capacity under 2000 ppm was investigated. The relationship between available absorption capacity and absorption enthalpy was also studied. Through a combination of thermodynamic analysis and quantum calculation, the results indicated that the effect of the cation in the IL on absorption enthalpy was significant. However, the effect of chain length in the cation was weak. Hence, a new IL with low molecular weight, [P 4442 ][Tetz], was further designed and applied for the capture of SO 2 , which shows the high absorption capacity of 0.18 g SO 2 per g IL and excellent reversibility for 2000 ppm SO 2 . © 2015 American Institute of Chemical Engineers AIChE J , 61: 2028–2034, 2015
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2022
·Vol. 68
·期 10
·e17775
·
IF 4.167
Bo Hao,Wenbo Zhao,Xiangxin Tong,Shaoyun Shan,Yuan Chen
The high viscosity of ionic liquids (ILs) limits their practical application in SO 2 capture. In this work, the low viscous aminoalkyl-phenyl-silanes were synthesized to capture SO 2 . The π – π interaction between phenyl groups reduced the volatility of aminoalkyl-phenyl-silanes greatly, but it did not increase their viscosity significantly. Among them, N-[(dimethylphenylsilyl)methyl]-N-methylbenzenemethanamine (DPSA) containing two phenyl groups exhibited the strongest π – π interaction. Therefore, the thermal decomposition temperature reached 150°C, while its viscosity was only 8.45 mPa·s at 25°C, which is much lower than that of ILs. The absorption enthalpy and entropy change of DPSA absorption reaction were −79.284 kJ/mol and −224 J/mol/K, respectively. These values are more negative than those of SO 2 capture reaction with ILs. An objective function was proposed to obtain the optimal absorption and desorption temperature. Furthermore, five cycles of regeneration experiments indicated that DPSA possessed good regeneration ability.
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
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Shuaiqi Gao,Pengling Zhang,Zhenzhen Wang,Guokai Cui,Jikuan Qiu,Jianji Wang
The emission of SO2 from the combustion of fossil fuels leads to many environmental issues. The incorporation of ionic liquids (ILs) on porous supports to produce supported ionic liquids is an effective technology for SO2 capture. However, blockage of pore channels is one of the main problems of this technology, which results in a substantial decrease of absorption capacity. Herein, a novel type of ionic liquid, 1-methyl-3-(3-triethoxysilylpropyl) imidazolium tetrazolate, functionalized large pore sized 3D mesoporous FDU-12 sorbents has been synthesized through a chemical grafting method. The as-prepared materials are characterized using SAXS, N2 adsorption, TEM, XPS, elements analysis, EDS mapping, and TGA and then the performance of these materials to capture SO2 is studied. The IL@FDU-12 materials are found to exhibit a high absorption capacity of SO2 up to 8.19 mmol SO2/g-sorbent (i.e., 524.2 mg/g) and a fast absorption rate (ca. 6 min is needed to reach equilibrium) at 25 °C and 1 bar since blockage of pore channels is effectively avoided and the IL is highly dispersed in the channels. These materials can also be used for the effective capture of CO2 (1 bar) and low content of SO2 (10%). Moreover, they have excellent thermal stability and can be reused in many absorption/desorption cycles without loss of the high absorption capacity and fast sorption/desorption rate.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Green Energy & Environment
·
2020
·
IF 6.395
Lili Jiang,Ke Mei,Kaihong Chen,Rina Dao,Haoran Li,Congmin Wang
An efficient method for prediction in the capture of SO 2 from flue gas by imidazolium ionic liquids was reported, where the concentration of SO 2 is 2000 ppm. On the basis of quantitative calculations through a combination of Langmuir simulation, theoretical calculation and quantum chemical method, SO 2 absorption and desorption performance from flue gas by twelve kinds of imidazolium ionic liquids with different anions were designed and predicted. Then, among them, five kinds of imidazolium ionic liquids were chosen and prepared to investigate their behavior of SO 2 absorption capacity , desorption residue, and available absorption capacity. The results indicated that the experimental values were in good agreement with the predicted values. Thus, an ideal ionic liquid [Emim][Tetz] was obtained through the predictive method for the capture of SO 2 of 2000 ppm, which showed high available absorption capacity of 0.24 g SO 2 per g ionic liquid and excellent reversibility .
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Yongli Sun,Yanling Zhang,Luhong Zhang,Bin Jiang,Wenhao Gu,Huawei Yang
In this work, a kind of aqueous solution of novel protic triamine-based ionic liquid was proposed for efficient SO2 capture. The mixed absorbents were prepared by blending 1,1,4,7,7-pentaethyldiethylene (PEDETA) with sulfuric acid and water, and their physicochemical properties were studied by various methods. Remarkably, the viscosities of the mixed absorbents are in the range of 1.44–1.85 mPa s at 293.2 K, which is as low as water. Detailed SO2 absorption experiments were carried out to investigate the influence of some important factors, including temperature (298.2, 313.2, and 328.2 K), SO2 partial pressure (0–1 bar), and sulfuric acid proportion. It is worth noting that the mixed absorbents showed excellent absorption capacity, especially at a low partial pressure. All absorbed SO2 could be released easily and completely by the method of heating reflux. More importantly, the absorbent could be reused for at least 5 cycles without noticeable changes in both absorption performance and chemical structure. A thermogravimetric analysis further confirmed its good thermal stability. The detailed absorption mechanism was proposed and demonstrated by an infrared spectrum. In the end, the pKa values and reaction enthalpy of the protonation reaction of PEDETA were determined by acid titration and parameter analysis based on the reaction equilibrium model. In summary, the mixed absorbents, which possess low viscosities, good resistance to sulfuric acid, excellent capacity, and reusability, may have a good perspective in industrial SO2 capture.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 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）