Green Energy & Environment
·
2018
·
IF 0
Wei Hui,Yan Zhou,Yan Dong,Zhi-Jun Cao,Fei-Qiang He,Min-Zhong Cai,Duan-Jian Tao
Novel superacid SO 4 H-functionalized ionic liquids (SFILs) were designed and prepared in this work. The catalytic activities of SFILs were evaluated in xylan hydrolysis and xylose dehydration to produce furfural. Combined with the results of acid strength of SFILs characterized by solid-state 31 P MAS NMR, it was found that the catalytic performance of SFILs was positively correlated to their acid strength. The superacid SFIL [Ch-SO 4 H][CF 3 SO 3 ] displayed the best catalytic performance with more than 80% yield of furfural, and it was also obviously superior to usual SO 3 H-functionalized acidic ILs, mineral liquid acids, and acidic resin Amberlyst-15 catalysts in catalytic activity under optimized conditions. In addition, the superacid SFIL [Ch-SO 4 H][CF 3 SO 3 ] could be easily separated from reaction system and reused at least five times without obvious decrease.
✓ 已验证
产品关联
DOI
Chemical Engineering and Processing-Process Intensification
·
2018
·
IF 2.826
Congfei Yao,Yucui Hou,Shuhang Ren,Youan Ji,Weize Wu,Hui Liu
Four kinds of dual-functionalized ionic liquids (DFILs, [Et 2 NEmim][Cl] 2 , [Et 2 NEmmor][Cl] 2 , [Et 2 NEmpyr][Cl] 2 and [Et 2 NEmpic][Cl] 2 ) were synthesized and used to efficiently separate phenolic compounds from model oils. The effects of stirring time, temperature, mole ratio of DFIL to phenol and initial phenol content on the separation were investigated. The results indicate that at a DFIL:phenol mole ratio of 0.3, the content of phenol in the oil phase can reach the minimum value and the extraction efficiency of phenol is more than 96%. The minimum phenol content in the oil phase and the best phenol extraction efficiency were 5.9 g/m 3 and 98.5%, respectively, when [Et 2 NEmpyr][Cl] 2 was used. Compared with traditional ionic liquids, these DFILs not only reduce the dosage of extraction agents but also greatly decrease the content of Cl − in the oil phase due to the double anion in the DFILs. The DFILs can be reused for 4 cycles without losses in phenol extraction efficiency and masses of the DFILs. The separation mechanism of extraction was studied using FT-IR. The result indicates that the two anions Cl − on DFILs can form a hydrogen bond with phenol.
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 149
·期 3
·665-671
·
IF 2.911
Lyu Xinyu,Wang Wencheng,Sun Yiqun,Zhao Qian,Qiu Tao
Abstract An ionic liquid catalyzed Friedel–Crafts alkylation reaction of substituted benzenes with CCl 4 was developed. The reaction proceeded efficiently under mild conditions, gave corresponding trichloromethylarenes with diversity functional groups in moderate to good yields. The influence of Lewis acidity of ionic liquids on the conversion of the alkylation reaction has been investigated. Notably, the probable mechanism of this reaction has been proposed with the assistance of 27 Al NMR spectroscopy. It was noteworthy that the predominance of [Al 2 Cl 7 ] − species in EmimCl–AlCl 3 , N = 0.67 could be detected by 27 Al NMR spectral analysis, and [AlCl 4 ] − was generated at the beginning of reaction. Additionally, it was found that [AlCl 4 ] − could be transformed into [Al 2 Cl 7 ] − when the reaction finished. Some control experiments confirmed that the interaction between Lewis acidic species [Al 2 Cl 7 ] − of the ionic liquid and CCl 4 led to the change in speciation of aluminum during the alkylation reactions. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 21
·6373-6378
·
IF 0
Bo Qiu,Congtao Pan,Wenjing Qian,Yingjing Peng,Lihua Qiu,Feng Yan
Nitrogen-doped mesoporous carbon materials are prepared via carbonization of a room temperature ionic liquid, 1-butyl-3-methylimidazolium dicyanamide (BMIMdca), using a mesoporous silica template (SBA-15). The nitrogen content and nanostructure of the resultant carbon materials are highly dependent on the carbonization temperature. The produced porous carbon materials were further applied as the electrode materials for supercapacitors. The porous structure and nitrogen functionalities enable carbon materials with a specific capacitance of 210 F g−1 at a current density of 1 A g−1 in a 6 M KOH aqueous solution. Furthermore, the nitrogen-doped porous carbon materials maintain a high capacitance retention capability (∼95%) after 1000 cycles at a current density of 1 A g−1, indicating that this kind of nitrogen-doped carbon material originated from room temperature ionic liquids is a promising electrode material for high-performance supercapacitors. These results may provide a facile synthesis of sulfur and nitrogen or multi-element doped porous carbon materials originated from ionic liquids for supercapacitors.
✓ 已验证
DOI
Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 1
·170-178
·
IF 0
Kun Yin,Zhengxi Zhang,Xiaowei Li,Li Yang,Kazuhiro Tachibana,Shin-ichi Hirano
Polymeric ionic liquids (PILs) have stirred up great interest for their potential applications as electrolyte hosts in lithium metal batteries (LMBs) because of their desirable performance. In this work, PIL-based gel polymer electrolytes applied in lithium metal batteries (LMBs) at low–medium temperatures (25 °C, 30 °C and 40 °C) are first reported. A novel imidazolium-tetraalkylammonium-based dicationic polymeric ionic liquid, poly(N,N,N-trimethyl-N-(1-vinlyimidazolium-3-ethyl)-ammonium bis(trifluoromethanesulfonyl)imide) is successfully synthesized, and its structure and purity are confirmed by 1H NMR, FTIR and elemental analysis. Subsequently, the ternary gel polymer electrolytes are prepared by blending the as-synthesized dicationic PIL as the polymer host with 1,2-dimethyl-3-ethoxyethyl imidazolium bis(trifluoromethanesulfonyl)imide (IM(2o2)11TFSI) ionic liquid and LiTFSI salt in different weight ratios. The PIL-LiTFSI-IM(2o2)11TFSI electrolytes reveal low glass transition temperatures around −54 °C and high thermal stability to about 330 °C. Moreover, the ternary gel polymer electrolytes show good ion conductivity around 10−4 S cm−1 at low–medium temperatures, high electrochemical stability and good interfacial stability with lithium metal. Particularly, the Li/LiFePO4 cells assembled with polymer electrolytes at a rate of 0.1 C are able to deliver discharge capacities of about 160 mA h g−1, 140 mA h g−1 and 120 mA h g−1 at 40 °C, 30 °C and 25 °C, respectively, with excellent capacity retention, as well as exhibiting acceptable rate capability. These findings reveal that dicationic PIL-based electrolytes have great potential for use as safe electrolytes in LMBs.
✓ 已验证
产品关联
DOI
CATALYSIS LETTERS
·
2015
·Vol. 145
·期 10
·1830-1836
·
IF 2.307
Zhou Yan,Huang Wei,Chen Xiang-Shu,Song Zhi-Bin,Tao Duan-Jian
Abstract Several tetramethylguanidinum-based ionic liquids (TMGILs) were prepared, characterized and used as catalysts in one-pot synthesis of flavanones. The results indicated that TMGILs composed of phenolate anion was beneficial for one-pot synthesis of flavanones, and [TMG][4-MeO–PhO] induced the good yields of flavanones owing to the electron-donating effect of methoxy substituent on phenolate anion. Furthermore, [TMG][4-MeO–PhO] was found to be used repetitively at least five times without obvious decrease in activity and quantity. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2014
·Vol. 60
·期 12
·4232-4240
·
IF 2.581
Kuan Huang,Xiao-Min Zhang,Yun Xu,You-Ting Wu,Xing-Bang Hu,Yun Xu
The solubilities of H 2 S and CO 2 in four protic ionic liquids (PILs)—methyldiethanolammonium acetate, methyldiethanolammonium formate, dimethylethanolammonium acetate, and dimethylethanolammonium formate were determined at 303.2–333.2 K and 0–1.2 bar. It is shown PILs have higher absorption capacity for H 2 S than normal ionic liquids (ILs) and the Henry's law constants of H 2 S in PILs (3.5–11.5 bar at 303.2 K) are much lower than those in normal ILs. In contrast, the solubility of CO 2 in PILs is found to be a magnitude lower than that of H 2 S, implying these PILs have both higher absorption capacity for H 2 S and higher ideal selectivity of H 2 S/CO 2 (8.9–19.5 at 303.2 K) in comparison with normal ILs. The behavior of H 2 S and CO 2 absorption in PILs is further demonstrated based on thermodynamic analysis. The results illustrate that PILs are a kind of promising absorbents for the selective separation of H 2 S/CO 2 and believed to have potential use in gas sweetening. © 2014 American Institute of Chemical Engineers AIChE J 60: 4232–4240, 2014
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Jing Gao,Li Chen,Zongcheng Yan
This study evaluated the effects of ionic liquids (ILs) on the formation of aqueous biphasic systems (ABS) with organic salts. Phase diagrams, tie lines, and respective tie line lengths were determined at 298 K and atmospheric pressure. Using imidazolium-based ILs, the effects of the IL anions and salt anions, as well as the addition of dipolar aprotic solvents (DAS) on ABS formation were investigated. In general, the IL with hydrogen bond basicity ranging between 0.38 and 0.60 formed ABS with organic salts. However, those below this range were insoluble, and those above this range did not undergo phase separation. The salt anion capacity to induce ABS increased with increased valence and decreased Gibbs free energy of hydration. Moreover, the biphasic area for the IL-based ABS reduced with increased DAS concentration.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2015
·
IF 3.091
Guangren Yu,Lin Zhang,Ibrahim A. Alhumaydhi,Ahmed A. Abdeltawab,Abdulaziz A. Bagabas,Hamid A. Al-Megren,Salem S. Al-Deyab,Xiaochun Chen
Ionic liquids (ILs) coupled with Ag + or Cu + salts to form a new kind of reactive absorbent have been studied to separate light olefin from paraffin recently. In this work, we prepared two halogen-free alkylimidazolium thiocyanate ILs with cheaper cuprous thiocyanate, i.e., [Bmim]SCN–CuSCN and [Emim]SCN–CuSCN (Bmim, 1-butyl-3-methylimidazolium; Emim, 1-ethyl-3-methylimidazolium) and investigated their absorption capability for propylene, propane and mixture of both at 1–7 bar and 298–318 K. The effects of operating parameter including cation nature, temperature, pressure, Cu + concentration and reuse of absorbent were investigated. Propylene shows a chemical absorption while propane does a physical one, and increasing Cu + concentration effectively improves the absorption capability for propylene and the selectivity of propylene/propane. [Bmim]SCN–CuSCN has higher absorption capability and selectivity for propylene than [Emim]SCN–CuSCN, e.g., [Bmim]SCN–CuSCN-1.5 M can absorb 0.12 mol of propylene per liter while 0.012 mol of propane per liter at 1 bar and 298 K, with a selectivity of 10, which is comparable to some other ILs-Ag + salts and better than pure ILs. Such absorbents can be regenerated through temperature and pressure swing without remarkable activity loss. This work shows that alkylimidazolium thiocyanate ILs with Cu + salts are promising reactive absorbents to separate propylene from propane.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2013
·
IF 1.164
Xiaochun Chen,Shuimin Ming,Xinying Wu,Chang Chen,Charles Asumana,Guangren Yu
The absorption of propylene and propane in Cu(I)-based ionic liquids, i.e., 1-butyl-3-methylimidazolium chloride/CuCl ([Bmim][Cl]/CuCl), N-Methyl pyrrolidone chloride/CuCl ([HNMP][Cl]/CuCl), and tricaprylmethylammonium thiocyanate/CuSCN ([A336][SCN]/CuSCN), are investigated in this work. It is observed that such Cu(I)-based ionic liquids, especially Bmim-based ionic liquids, present good absorption capability for propylene and good selectivity over propane, e.g., 1.0 kilogram [Bmim][Cl]/CuCl is able to absorb 0.08 mol propylene while only 0.006 mol propane at 25°C and 1.3 bar with the selectivity of 13. The effects of pressure, Cu+ concentration, and temperature on the absorption are investigated; in addition, the absorption kinetics of propylene by [Bmim][Cl]/CuCl is obtained. The much higher absorption capability for propylene than propane is ascribed to the π-complexation between propylene and Cu+. This work shows that the absorption by Cu(I)-based ionic liquids is an potential alternative method for traditional cryogenic distillation with high energy cost to separate propylene and propane.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 130
·期 4
·2359-2368
·
IF 1.395
Wei Cheng,Qi Yu,Zhiming Qiu,Yurong Yan
Additives have been proven to be useful in improving electrospinnability and controlling fiber morphology through the modification of solution properties, including the conductivity, viscosity, and surface tension. In this study, the effects of adding small amounts of four different types of ionic liquids [i.e., 1-butyl-3-methylimidazolium chloride (C 4 MIMCl), 1-dodecyl-3-methylimidazolium chloride (C 12 MIMCl), 1-ethyl-3-methylimidazolium bromide (C 2 MIMBr), and 1-ethyl-3-methylimidazolium phosphate (C 2 MIM) 3 PO 4 ] on the solution properties, electrospinning process, and characteristics of polyacrylonitrile (PAN) were investigated. The results show that the solution conductivities significantly increased with the addition of different ionic liquids with concentrations varying from 0.1 to 1.0 wt %, and the tendency depended on the structures of the ionic liquids. (C 2 MIM) 3 PO 4 showed the highest conductivity value; this was followed by C 2 MIMBr, C 4 MIMCl, and C 12 MIMCl. The ionic liquids formed visible crystals; this made the fiber surfaces rough, and some fiber segments underwent partial aggregation. A regular varying tendency between the minimum mean diameter of the PAN/ionic liquid fibers and the structure of the ionic liquid was found. The PAN/ N,N -dimethylformamide (DMF)/(C 2 MIM) 3 PO 4 solution showed the highest conductivity among the four systems with different ionic liquids added, and the thinnest minimum diameter of the PAN/(C 2 MIM) 3 PO 4 fibers appeared with a relatively low ionic liquid concentration of 0.25 wt %, whereas the PAN/DMF/C 12 MIMCl solution had the lowest conductivity, and the minimum mean diameter of PAN/C 12 MIMCl fibers appeared at a relatively high ionic liquid concentration of 0.8 wt %. Although the conductivity of the PAN/DMF/C 2 MIMBr solution was higher than that of the PAN/DMF/C 4 MIMCl solution, the minimum mean diameters of the PAN/C 2 MIMBr and PAN/C 4 MIMCl fibers appeared at the same ionic liquid concentration of 0.5 wt % because of the similar ionic activities of C 2 MIMBr and C 4 MIMCl. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 2359–2368, 2013
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2014
·Vol. 32
·期 5
·410-416
·
IF 1.04
Chunhai Liu,Qihui He,Zheng Zhang,Yangyang Su,Renfu Xu,Baixing Hu
Four BrØsted acid ionic liquids (ILS) [MMP][DMP], [MEP][DEP], [HMP][DMP] and [HEP][DEP] were synthesized and used as extractants for desulfurization of aromatic sulfur compounds in model oil. The mutual solubility of four ILs were investigated. The extraction equilibrium of four ILs could be reached in as soon as 5 min and the extraction capability followed the order [MMP][DMP]>[MEP][DEP]>[HEP][DEP]>[HMP][DMP]. The S extraction showed the highest efficiency under the conditions of 30°C, 30 min and 1:1 ( V / V ) IL:oil. Under the optimal condition, 70.9% of thiophene (TS), 76.9% of benzothiophene (BT) and 87.5% of dibenzothiophene (DBT) in n -octane could be efficiently removed by [MMP][DMP]. The multiple extraction and regeneration performance of [MMP][DMP] for TS was also investigated and the results were satisfying. These results suggest that [MMP][DMP] has the best extraction capability and can serve as a promising solvent for extractive desulfurization of fuel oils.
✓ 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）