World Journal of Engineering
·
2014
·Vol. 11
·期 3
·271-278
·
IF 0
Leqin He,Jiquan Zhao,Shenjun Qin,Tao Chang,Yuecheng Zhang,Guangqing Zhang,Xiaorui Gao
Five halogen-free amphiphilic Brønsted acidic ionic liquids (ILs) based on 3-(N,N-dimethylalkylammonium)-propanesulphonate quaternary ammonium zwitterions andp-toluene sulphonic acid monohydrate were synthesized. The IL structures were characterized using1H NMR,13C NMR and (ESI)-MS. The IL thermal instability was characterized using TG-DSC. The ILs were used as dual-solvent catalysts for esterification of several carboxylic acids, with different alcohols under mild conditions to study relevant structure-activity relationships. Results showed that the miscibility of the acidic IL, which is affected by the length of the carbon chain in the cation, is an important factor influencing the activity of the catalyst for the esterification reaction. Post-processing steps were simple, and the catalyst could be reused easily.
研究领域:
化学
·
催化科学
✓ 已验证
DOI
FOOD CHEMISTRY
·
2024
·
IF 8.5
Siying Che,Yao Fan,Xuemei Hu,Linlin Yin,Haiyan Fu,Yuanbin She
A novel fluorescent probe was fabricated using fluorescein-based ionic liquids (ILs) to effectively achieve rapid and accurate detection of Hg 2+ and CH 3 Hg + in food. A probe developed by addition of modified fluorescein into the functionalised ILs presented a promising sensitivity toward Hg 2+ and CH 3 Hg + at concentrations of 0.4 and 60 nM, respectively. In addition, the novel probe could achieve visual and timely detection of Hg 2+ and CH 3 Hg + by the naked eyes at concentrations of 0.1 and 1 μM, respectively. The probe could also overcome the interference of potential ions and common organic ligands and detect Hg 2+ and CH 3 Hg + in real food samples, such as green tea and liquor. The probe could be converted into a paper-based sensor to visually detect Hg 2+ and CH 3 Hg + at levels as low as 10 nM.
研究领域:
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 1.687
Ibrahim A. Alhumaydhi,Rashid Abro,Shaukat Ali Mazari,Masroor Abro,Sabzoi Nizamuddin,Abdul Q. Memon,Guangren Yu
This work presented the preparation of two new systems comprised of ionic liquids (ILs), organic solvent, and cuprous salt. Consequently, their absorption ability was investigated for propylene (C 3 H 6 ) and propane (C 3 H 8 ) and their mixtures at 100 kPa-700 kPa pressure and 298 K-318 K temperature. Representative ILs were 1-butyl-3-methylimidazolium thiocyanate ([C 4 mim]SCN) and 1-ethyl-3-methylimidazolium thiocyanate ([C 2 mim]SCN). N,N-dimethylformamide (DMF) and cuprous thiocyanate (CuSCN) were selected for the absorption system. The effects of operating parameters like Cu + concentration, pressure, temperature, and recycling of ILs absorbency were examined and compared with the literature. It was observed that C 3 H 6 shows a chemical absorption while C 3 H 8 undergoes a physical one by [C 4 mim]SCN-DMF-CuSCN and [C 2 mim]SCN-DMF-CuSCN, and an increase in concentration of Cu + effectively improves the absorption capability for C 3 H 6 and the selectivity of C 3 H 6 /C 3 H 8 . Furthermore, [C 4 mim]SCN-DMF-CuSCN had higher absorption capability and selectivity for C 3 H 6 than [C 2 mim]SCN-DMF-CuSCN. [C 4 mim]SCN-CuSCN-2.0 M absorbed 0.637 mol of C 3 H 6 per litre while 0.16 mol of C 3 H 8 per litre at 700 kPa and 298 K, with a selectivity of 3.9. This work shows that new combination of organic solvent and ILs with Cu + salt is a new class of potential reactive absorbents to separate C 3 H 6 and C 3 H 8 .
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2014
·
IF 2.083
Jiayi Chen,Lingxiao Chen,Yueqing Lu,Yingjie Xu
Densities ( ρ ) and viscosities ( η ) of 1-methylimidazolium acetate ([Mim]Ac) protic ionic liquid + water mixture were measured at T = (293.15, 298.15, 303.15, 308.15 and 313.15) K under atmospheric pressure. Refractive indices ( n D ) and electrical conductivities ( κ ) of the above-mentioned system over the entire composition range were measured at 298.15 K. Excess molar volumes ( V E ), viscosity deviations (Δ η ) and refractive index deviations (Δ n D ) were obtained from the experimental data and fitted to the Redlich–Kister equation with satisfactory results. The results show that V E values of the system are negative over the whole composition range, whereas Δ η and Δ n D values are positive. Other volumetric properties such as apparent molar volumes ( V ϕi ), partial molar volumes ( V ¯ m , i ) and excess partial molar volumes ( V ¯ m , i E ) of the system were calculated from the density data. The concentration dependence of κ was fitted according to the empirical Casteel–Amis equation. The measured and derived properties were employed to investigate the intermolecular interactions of the system.
研究领域:
物理化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2016
·
IF 2.74
Runping Wang,Yuena Chang,Zhijian Tan,Fenfang Li
Phase diagrams of a series of ionic liquid-based aqueous biphasic systems (ILABS) composed of novel choline amino acid ionic liquids and inorganic salts were measured experimentally at T = (288.15, 298.15 and 308.15) K. Ionic liquids, salts, and temperature influenced the phase separation ability of the studied ILABS. Several parameters of the Merchuk equation were estimated by fitting the binodal curve data. Liquid-liquid equilibria of the investigated ILABS were determined by a gravimetrical method, including the tie-line lengths and slope of the tie-lines. Critical points of the corresponding ILABS were obtained by a mathematical calculation different from the conventional extrapolation. In the case of the phenylalanine + K 3 PO 4 + H 2 O system at 298.15 K, the gravimetrical method and the mathematical calculation were validated by the tie-lines determined experimentally and the critical point derived from the extrapolation.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2017
·Vol. 7
·期 10
·300
·
IF 3.082
Yi-Ming Ren,Mao-Dong Xu,Xiong Wang
An efficient procedure has been researched for the solvent-free synthesis of bis(indolyl)methanes via a one-pot reaction of indoles and aldehydes or ketones promoted by PEG1000-based dicationic acidic ionic liquid (PEG1000-DAIL). The catalyst PEG1000-DAIL could be reused seven times with excellent results. Furthermore, through this method, a highly chemoselective reaction of benzaldehyde and acetophenone with indole could be achieved.Keywords:bis(indolyl)methanes;ionic liquids;solvent-free conditions
研究领域:
有机化学
·
催化化学
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产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 8
·1512-1522
·
IF 1.113
Li Qiaoping,Xu Bin,Wang Yan,Zhuang Linghua,Wang Qiang,Li Chao,Xu Xiaoqing,Wang Guowei
3-methyl-1-ethoxycarbonylimidazolium chloride ([EtMIM]Cl), was synthesized for white hide powder dissolution. White hide powder was successfully dissolved in [EtMIM]Cl, and regenerated from methanol. The dissolution data and thermodynamic parameter of white hide powder in [EtMIM]Cl and [BMIM]Cl were studied. Hydrogen bond basicity (β) and general polarizability (π*) of ILs were determined. The white hide powders were characterized by FT-IR, XRD, and TGA. The results showed that the maximum solubility of white hide powder in [EtMIM]Cl was higher than that in [BMIM]Cl at same dissolution temperature. At same temperature and same solid content, the dissolution time of white hide powder in [EtMIM]Cl was shorter than that in [BMIM]Cl. Density functional theory (DFT) simulation showed that two kinds of hydrogen bonds (C-H/O and C-H/Cl) and eight strong hydrogen bonds are found in [EtMIM]Cl/GPH, while seven hydrogen bonds are found in [BMIM]Cl/GPH. The carboxylic acid ester cationic group in [EtMIM] + has more electronegative ester groups and stronger electronic cloud density oxygen atoms than alkyl group in [BMIM] + , [EtMIM]Cl is easier to destroy the intermolecular or intramolecular hydrogen bonds in white hide powder, so as to accelerate the dissolution of white hide powder in [EtMIM]Cl. The molecular simulation results indicated that both Cl − anions and [EtMIM] + cation played important roles in the white hide powder dissolution.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 9
·3905-3913
·
IF 1.754
Guo Zong,Chu Taiwei
In this work, a separation and purification process of U(VI), Zr(IV) and I 2 from various fission products in nitric acid solution by 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C 4 mim][NTf 2 ]) and dibutyl-3-(3-methylimidazolium)propylphosphoramide bis(trifluoromethanesulfonyl)imide-task specific ionic liquid (phosphoramide-TSIL) was investigated. The phosphoramide-TSIL was found to reduce ligand loss compared to dibutyl propylphosphoramidate by total organic carbon testing (TOC). The stripping of U(VI), Zr(IV) and I 2 could be achieved by guanidine carbonate solution, oxalic acid solution and sodium hydroxide solution, respectively. The phosphoramide-TSIL/[C 4 mim][NTf 2 ] showed good irradiation stability and recyclability. Phosphoramide-TSIL has the potential to be applied for separation and purification in the actual radioactive environment. Graphical abstract
研究领域:
核化学与放射化学
·
环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qingrong Wu,Guilin Li,Yanyan Cheng,Bangyu Fan,Yinge Bai,Nian Zhang,Zhongzhi Wang,Xiangping Zhang,Suojiang Zhang
Efficient purification of ethylene (C 2 H 4 ) from ethane (C 2 H 6 ) is one of the seven chemical separations which can change the world. Chemical absorption is considered as the most promising method for C 2 H 4 /C 2 H 6 separation. However, the two critical separation properties of absorbent, the solubility and selectivity, are always trade-offs, which are still needed to both promote and balance in the viewpoint of industrial application. Herein, a series of novel silver-containing protic imidazolium ionic liquids (SPILs), with high chemical activity for efficient C 2 H 4 absorption, have been designed and synthesized. The physical properties of the prepared silver-containing ionic liquids (SILs) were first characterized. Then the separation performances of C 2 H 4 /C 2 H 6 by SPILs and silver-containing aprotic ionic liquids (SAILs) were carefully compared. The C 2 H 4 /C 2 H 6 selectivity of SPILs (16.73) was eight times higher than the value of the latter. Then, the C 2 H 4 absorption mechanism was confirmed by density functional theory (DFT) calculations. The charge density of Ag + was greater and the Gibbs free energy (ΔG) of C 2 H 4 absorption was more negative in [Bim] n [Ag(NTf 2 ) n+1 ]. The proposed SPILs, [Bim] 1.5 [Ag(NTf 2 ) 2.5 ], had a high C 2 H 4 /C 2 H 6 selectivity of 41.2 and C 2 H 4 solubility of 1.86 mol C 2 H 4 /mol Ag + , which were the highest value of ionic liquids (ILs) absorption reported so far. The [Bim] 1.5 [Ag(NTf 2 ) 2.5 ] exhibited excellent reversibility after five absorption–desorption cycles. An absorbent designed strategy of SPILs was proposed with enhanced solubility and selectivity for C 2 H 4 /C 2 H 6 separation.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Qingqing Tao,Felipe Nunes Henriquez,Kang Ding,Wai Lun Man,Matthew Y. Lui
The application of ionic liquids and deep eutectic solvents offers a promising opportunity for a more environmentally friendly and straightforward chitin purification process from crustacean shells. Nonetheless, the insufficient recyclability of these ionic solvents poses a challenge to the long-term sustainability of such extraction methods. Thus, there is a strong imperative to focus on employing easily recyclable ionic liquids for chitin isolation, enhancing the overall sustainability of the process. In this investigation, a direct chitin purification procedure that utilized pulping liquors consisting of the superbase-based protic ionic liquid 1,5-diazabicyclo[4.3.0]non-5-enium acetate and its precursor, acetic acid, was developed. It was demonstrated that these pulping liquors were capable of simultaneously deproteinate and demineralize shrimp shells to generate chitins with higher purity, degree of N -acetylation and crystallinity than commercially obtained chitin. More significantly, the pulping liquors can be recycled to their pure form in high quantity by simple distillation under reduced pressure, allowing the reuse of these mixtures, which give chitin of nearly identical purity.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING & TECHNOLOGY
·
2019
·Vol. 43
·期 3
·403-411
·
IF 2.418
Huan Li,Tian Ma,Zhensheng Shen,An Li,Jie Yang,Dong Xiang,Jiuyi Liu,Shuguang Deng,Yingqiang Sun
1-Butyl-3-methylimidazolium hydrogen sulfate ([Bmim][HSO 4 ]) is utilized to catalyze transesterification of camelina oil with methanol. The major compositions of camelina biodiesel are saturated fatty acid esters (C16:0, C18:0), monounsaturated, and polyunsaturated fatty acid esters (C18:2, C18:3). The effects of reaction temperature, reaction time, M methanol : M Camelina oil , and M [Bmim][HSO4] : M Camelina oil on biodiesel production are investigated in detail, and a general mathematical model is developed to well predict the biodiesel yield. Also, [Bmim][HSO 4 ] is thermally stable to recycle for four times with a high biodiesel yield. The fuel properties of camelina biodiesel are all comparable to the American Society for Testing Materials (ASTM) standards.
研究领域:
能源科学
·
化学工程
✓ 已验证
DOI
高影响因子
Research
·
2019
·
IF 0
Yunru Yu,Jiahui Guo,Lingyu Sun,Xiaoxuan Zhang,Yuanjin Zhao
Inspired by helical or spiral veins, which endow plants with excellent flexibility and elasticity to withstand storms, we present novel hollow microsprings with ionic liquid encapsulation for flexible and stretchable electronics. The microsprings were generated by using a coaxial capillary microfluidic device to consecutively spin poly(vinylidene fluoride) (PVDF) presolution and an ionic liquid, which formed laminar flows in the coaxial injection microfluidic channels. The fast phase inversion of PVDF helps to form the core-shell structure of a microfiber and guarantees the in situ encapsulation of ionic liquid. The hybrid microfiber can then spiral and be further solidified to maintain the helical structure with increasing flow rates of the injection fluids. Because of the feasible and precise control of the injection fluids during the microfluidic spinning, the resultant microsprings have controlled core-shell structures, helical pitches, and corresponding electromechanical properties. By further embedding them into stretchable films, the simple paradigm of a flexible device shows great conductive performance in tensile tests and even motion cycles, which could be explored as a promising candidate in stretchable sensors, flexible electronics, and electronic skins.
研究领域:
材料科学
·
生物仿生学
·
电子工程
✓ 已验证
DOI
危险品化学品经营许可证（带存储）