CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2018
·
IF 2.795
Maogang He,Siqi Liu,Lihang Bai,Xiangyang Liu
Magnetic ionic liquids (MILs), combines the general properties of ionic liquid with magnetic properties, are starting to attract interest in the field of propane/propylene separation and CO 2 capture. Solubility data of propane, propylene, cyclopropane and CO 2 in magnetic ionic liquid 1-butyl-3-methylimidazolium tetrachloroferrate [bmim][FeCl 4 ] at temperatures of (303, 313, 323, 333, 343) K and pressures up to 3300 kPa were determined in the present work. The relative expanded uncertainty of solubility measurement is estimated to be less than 4% with a level of confidence of 95%. The Henry’s constants for the four gases in [bmim][FeCl 4 ] and selectivity of C 3 H 6 /C 3 H 8 in [bmim][FeCl 4 ] were calculated. And the thermodynamic properties of solvation concerned about the Gibbs energy (Δ sol G ∞ ), the enthalpy (Δ sol H ∞ ) and the entropy (Δ sol S ∞ ) of solvation were also obtained to offer knowledge for understanding the progress of gases dissolved in [bmim][FeCl 4 ]. The experimental results were correlated with a modified KK equation and NRTL equation.
研究领域:
化学工程
·
分离科学
·
物理化学
·
环境化工
·
绿色溶剂技术
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2016
·Vol. 59
·期 5
·587-593
·
IF 2.429
Pei Yuanchao,Cao Yuan,Huang Yanjie,Song Xinxin,Wang Huiyong,Zhao Yuling,Wang Jianji
In this work, 16 kinds of [FeCl 4 ] - -based magnetic ionic liquids (ILs) with different cation structures have been designed and synthesized, and their structures are characterized by IR and Raman spectroscopy. Then the lower critical solution temperature (LCST)-type phase behavior of these magnetic ILs in water is investigated as a function of concentration. It is shown that cation structure, alkyl chain length and molar ratio of FeCl 3 /chloride IL have a significant influence on the LCST of the mixtures. The phase separation temperature can be tuned efficiently by these factors. Meanwhile, the LCST-type phase separation process is also investigated by dynamic light scattering. The results support the mechanism that the hydrogen bonds of the [FeCl 4 ] - anion with water have been gradually disrupted to form ILs aggregates with increasing temperature. In addition, the stability of the ILs in water is also examined in some details. These LCST-type phase separation systems may have potential applications in extraction and separation techniques at room temperature.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING & TECHNOLOGY
·
2022
·Vol. 45
·期 10
·1867-1875
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IF 2.215
Kui Qiu,Zhihao Liu,Yu Dong,Luwei Liu,Weijun Li,Shihao Niu,Zhaobo Jin
An iron/copper bimetallic catalytic oxidation desulfurization system was constituted by adding N -methyl pyrrolidone (NMP) and CuCl 2 aqueous solution to an iron-based ionic liquid (Fe-IL) for the removal of hydrogen sulfide from industrial gas streams. The desulfurizer and its sulfur products were characterized using Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and X-ray diffraction (XRD). Static desulfurization experiments were conducted to investigate the absorption pattern of the system for H 2 S. The addition of NMP and water effectively reduced the acidity and viscosity of the system and improved the gas-liquid mass transfer efficiency. The introduction of CuCl 2 increased the oxidation potential of the solution and enabled Fe 3+ to efficiently catalyze the oxidation of H 2 S to produce monomeric S. The synergistic catalytic oxidation between Fe 3+ /Cu 2+ is the main reason why the system can maintain a high degree of purification over a long period.
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
MACROMOLECULES
·
2021
·
IF 5.985
Xiaoliang Yu,Zhengyi Xia,Tengda Zhao,Xiaoyan Yuan,Lixia Ren
Organic magnets are promising in quantum computers, spintronic devices, and information storages for their excellent processing and smart design abilities, resulting from the organic part. However, the organic part shields the magnetic centers to weaken the magnetic interaction. In this work, π–π stacking planar pyrene groups are introduced into cations of a magnetic ionic liquid (NBPBI[FeCl4]) and poly(ionic liquid) (PNBPBI[FeCl4]) with FeCl4– as the anions. By introducing pyrene groups, the shortest distance between neighboring magnetic units is within 4 Å. The ferromagnetic interactions in NBPBI[FeCl4] and PNBPBI[FeCl4] are enhanced by the π–π stacking pyrene groups. Moreover, the corresponding organic magnets are soft ferromagnets, as phase transition from paramagnetism to ferromagnetism is observed from zero field cooling and field cooling tests at the low temperature. This is a new strategy for designing a ferromagnetic organic magnet.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2020
·
IF 6.082
Fa-Ping Liu,Ai-Rong Li,Jie Wang,Ze-Dong Luo
Hydrate technology is a promising alternative method for carbon dioxide (CO 2 ) capture and storage from flue gas . In order to promote the hydrate growth rate and increase gas storage capacity, CO 2 hydrate nucleation and growth induced by iron-based ionic liquid ([BMIM][FeCl 4 ]) was studied with 400 rpm rotation speed at a temperature of 274.15 K and initial pressure of 5.0 MPa in this work. The induction time of CO 2 hydrate formation was decreased by 52.8% and the storage capacity of CO 2 hydrate was increased by 13.7% in 25.0 g/L [BMIM][FeCl 4 ] solution. The local hydrogen bonds are strengthened by the combination interaction between the complex anion ([FeCl 4 ] − ) and water (H 2 O) molecules, which is favorable to the ordered arrangement and the proton exchange rate of H 2 O molecules during the hydrate nucleation. Besides, large mass transfer channels are formed by the large molar volume and regular tetrahedral structure of [FeCl 4 ] − during the hydrate growth, which improves the diffusion rate of CO 2 and H 2 O molecules in the solution to promote the hydrate growth. Distribution of lipophilic cation and hydrophilic anion with a large molecular volume of [BMIM][FeCl 4 ] at the gas-liquid interface hinders the formation of cage structure of H 2 O molecules.
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
RSC Advances
·
2015
·Vol. 5
·期 54
·43528-43536
·
IF 3.84
Suhang Xun,Wenshuai Zhu,Dan Zheng,Hongping Li,Wei Jiang,Ming Zhang,Yuejiao Qin,Zhen Zhao,Huaming Li
High activity oxidation of sulfur compounds to sulfones in extraction coupled with catalytic oxidative desulfurization (ECODS) system catalyzed by supported ionic liquid [Bmim]FeCl4/Am TiO2 was reported. The catalysts were analyzed by thermogravimetric (TG) analysis, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). It was found that [Bmim]FeCl4 and Am TiO2 had a synergistic effect on the desulfurization system. Effects of calcination temperature of the catalyst and various reaction conditions on the catalytic activity of desulfurization were investigated. Moreover, GC-MS analyses were employed to prove the process of the desulfurization. As a solid catalyst, the supported ionic liquid could be separated from the reaction easily. The recycling tests showed that the desulfurization efficiency remained 100% after reusing it for 25 times. Therefore, the ECODS system has excellent reusability and is promising for industrial applications for catalytic oxidative desulfurization.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2023
·Vol. 14
·期 18
·2238-2245
·
IF 4.6
Shengqi Ji,Xiaoyan Yuan,Qianjin Guo,Lixia Ren
Self-assembly is a universal method to prepare block copolymers with ordered structures, which is very important in organic magnets to align the magnetic centres to enhance ferromagnetic interaction. The amphiphilic magnetic polymers (PTMTBDI[FeCl4]) with para-terphenyl group in the cations and high spin FeCl4− as single spin carrier are prepared by ring-opening metathesis polymerization (ROMP) and post-modification. Due to the strong π–π stacking interaction between terphenyl groups, magnetic polymers are self-assembled into macromolecular mono-layer structures with hydrophilic FeCl4− on the two sides and the polymer main chain and side group in the middle in aqueous solution. Fe(III) atoms are arranged in lattice fringe with domain spacing of ca. 2.6 Å. Magnetic property studies show that the polymers are changed from paramagnetic to ferromagnetic with hysteresis loops after self-assembly. The ferromagnetic interaction is induced by the close packing and ordered alignment of the Fe(III) atoms. This work unveils a new method to generate ordered structures in angstrom periodicity and thus improve ferromagnetic interaction in organic magnets.
研究领域:
材料科学
·
高分子化学
·
磁学
✓ 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）