THERMOCHIMICA ACTA
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2018
·
IF 2.189
Jun-Cheng Jiang,Li Li,Jia-Jia Jiang,Yan Wang,Siu-Ming Lo,Yong Pan,Xu-Hai Pan,Lei Ni
Tert-butyl peroxybenzoate (TBPB) is thermally unstable organic peroxide, which may cause disasters such as fire or explosion when excessive heat released due to thermal decomposition. Ionic liquid is often used as a catalyst and inhibitor in engineering applications recently. This study investigated the thermal decomposition characteristics of TBPB when added two different ionic liquids which are 1-Propyl-3-methylimidazolium iodide ([PMIM][I]) and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]) respectively with different mass ratio under DSC tests. Characteristic parameters such as the onset exothermic temperature (T 0 ) and heat of decomposition (ΔH d ) of samples were compared. Kinetic parameters such as activation energy E a were computed using two isoconversional methods which were Ozawa method and Friedman method respectively. The model based (zeroth order reaction) estimation method was used to estimate TMR ad at T 0 from non-isothermal DSC measurements to assess the thermal hazard of five samples. The paper aims to study the effect of ionic liquids (ILs) on the thermal decomposition of TBPB and analysis the influence of two ionic liquids on the decomposition mechanism of TBPB.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2019
·
IF 6.97
Qi Zhang,Yucui Hou,Shuhang Ren,Kai Zhang,Weize Wu
Functional ionic liquids (ILs), which have high absorption capacities of low-concentration SO2 through chemical interaction, have been widely studied. However, the absorbed SO2 in functional ILs is normally desorbed with high-temperature and steaming treatment, which is harmful to the stability of absorbents and causes high-energy consumption. In this work, functional ILs (monoethanolaminium lactate-[MEA]L, 1,1,3,3-tetramethylguanidinium lactate-[TMG]L, tetraethylammonium lactate-[N2222]L) mixed with ethylene glycol (EG) or H2O were used to capture low-concentration SO2, and then H2S was added to regenerate the absorbents via the liquid-phase Claus reaction. It was found that the reaction of H2S with SO2 in the absorbents proceeded fast and the absorbed SO2 was almost completely converted to solid sulfur (S8) under mild conditions without the addition of any catalysts. The effects of temperature, H2S initial pressure, and solvent on the Claus reaction in the functional ILs were investigated, and the optimal reaction conditions were obtained. The recycle experiments showed that the activity of the functional ILs for the Claus reaction was not decreased after being reused three times. The Claus reaction between H2S and SO2 in functional ILs provides a promising method for the efficient regeneration of functional ILs and SO2 resource utilization.
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PETROLEUM CHEMISTRY
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2018
·Vol. 58
·期 1
·56-61
·
IF 0.932
Wang Wang,He Zhenzhen,Li Conghao,You Zhixiang,Guo Hongyun
Phenol and butanolone catalyzed by different SO 3 H-functionalized ionic liquids (ILs) for synthesis of raspberry ketone (RK) had been investigated. The influences of different ionic liquids, reaction time, reaction temperature, reactant ratio, the amount of ionic liquid were investigated. The yield of raspberry ketone was 82.5% under the optimum reaction condition. In addition, the ILs (3-sulfo)propyltriamine bisulfate ([TEA-PS][HSO 4 ]) can be recycled up to five consecutive times without loss of activity. This method had the advantages of mild conditions, high product yield, easy to separate from the product, as well as environmentally friendly procedure. At the same time, the possible reaction mechanism was discussed.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2018
·
IF 2.631
Xue Wang,Dawei Shang,Shaojuan Zeng,Yuanming Wang,Xiaochun Zhang,Xiangping Zhang,Jindun Liu
Absorption and adsorption technology as widely used methods have been reported for carbon dioxide (CO 2 ) separation. In order to combine the advantages of absorption and adsorption methods, ionic liquids (ILs) as absorption function and zeolitic imidazolate framework-8 (ZIF-8) as adsorption function were integrated into a slurry to efficiently capture CO 2 by the absorption-adsorption method. In this study, two pyridinium-based ILs, [C 4 Py][NTf 2 ] and [C 4 Py][N(CN) 2 ] were synthesized, and mixed with different concentration of ZIF-8 to form hybrid slurries. CO 2 solubility in the different hybrid slurries at temperatures from 303.15 to 333.15 K was measured. The results indicated that CO 2 solubility increases significantly with increasing pressure and decreases with increasing temperature. Moreover, CO 2 solubility increases with the increase of ZIF-8 content, indicating that the addition of ZIF-8 into ILs can obviously enhance CO 2 solubility. CO 2 solubility in the ZIF-8/[C 4 Py][NTf 2 ] slurry increases by 24% compared with the corresponding pure IL at 303.15 K and 1.80 MPa. The absorption-adsorption mechanism was studied using FT-IR and NMR spectroscopy. It was demonstrated that CO 2 absorption and adsorption in the ZIF-8/ILs hybrid slurries is a physical process. Furthermore, the ZIF-8/[C 4 Py][NTf 2 ] slurry can also keep the stable absorption performance after five consecutive absorption and desorption cycles. Considering the excellent capacity, thermal stability and recyclability, the porous materials/ILs slurry will provide new insight to CO 2 capture compared with the conventional absorbents.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 18
·12808-12816
·
IF 3.906
Zhiyong Li,Xiaoqing Yuan,Ying Feng,Yongkui Chen,Yuling Zhao,Huiyong Wang,Qingli Xu,Jianji Wang
Photo-induced conductivity modulation of stimuli-responsive materials is of great importance from the viewpoint of fundamental research and technology. In this work, 5 new kinds of azobenzene-based photo-responsive ionic liquids were synthesized and characterized, and UV/vis light modulation of their conductivity was investigated in an aqueous solution. The factors affecting the conductivity modulation of the photo-responsive fluids, such as photo-isomerization efficiency, photo-regulation aggregation, concentration and chemical structure of the ionic liquids, were examined systematically. It was found that the conductivity of the ionic liquids in water exhibited a significant increase upon UV light irradiation and the ionic liquids with a shorter alkyl spacer in the cation showed a more remarkable photo-induced conductivity enhancement with a maximum increase of 150%. In addition, the solution conductivity was restored (or very close) to the initial value upon an alternative irradiation with visible light. Thus, the solution conductivity can be modulated using alternative irradiation with UV and visible light. Although the reversible photo-isomerization of the azobenzene group under UV/vis irradiation is the origin of the conductivity modulation, the photo-regulated aggregation of the ionic liquid in water is indispensable for the maximum degree of conductivity modulation because UV irradiation can weaken, even break the aggregated cis-isomers of the ionic liquids in an aqueous solution.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 11
·8783-8790
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IF 3.201
Xuezhi Dai,Xiaolian Qiang,Jing Gao,Juan Teng,Huimin Zang,Hang Song
Microemulsions with magnetic properties were formulated and optimized at 25 °C by using a series of pentaalkylguanidinium-based magnetic room-temperature ionic liquids (MRTILs) 1,1,3,3-tetramethyl-4-alkylguanidinium bromotrichloroferrate(III) [CnTMG][FeCl3Br] (n = 2, 4, 6, and 8) as a polar phase, different aliphatic oils as a nonpolar phase, and an optimal mixture of nonionic surfactant Triton X-100 (TX-100) and different short-chain aliphatic alcohols as a cosurfactant. The phase behaviors of these microemulsions were investigated by a cloud titration method. The results revealed that cyclohexane (as the nonpolar phase) coupled with TX-100/1-pentanol (mole ratio of 1 : 3) showed the best ability to formulate MRTILs-based microemulsions and the range of monophasic region was expanded with an increase in the length of alkyl chain attached to the NRH+ group of MRTILs cation. Based on conductivity measurements, the classical structural sequence of oil-in-MRTILs (O/MRTILs), bicontinuous sponge structure (BC), and inverse MRTILs-in-oil (MRTILs/O) microemulsions was observed with an increase of m(Oil)/m(MRTILs) ratio. Dynamic light scattering (DLS) and cryo-high resolution scanning electron microscopy (Cryo-SEM) measurements showed that microemulsion droplets with the size of about 3 to 7 nm were formed in the MRTILs/O subregions and the droplet size increased with an increase in the concentrations of MRTILs. Magnetic susceptibility and rheological measurements revealed that these MRTILs-based microemulsions had strong magnetic susceptibility and low viscosity over the entire optically clear range of composition. This comprehensive investigation provides useful information for formulating analogous MRTILs-based microemulsions and these magnetic microemulsions should have interesting potential applications by simply manipulating the external magnetic field.
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Food Science & Nutrition
·
2018
·Vol. 6
·期 8
·2020-2027
·
IF 1.521
Hong Fu,Mengqi Li,Ruimin Ni,Yangming Martin Lo
Two different fish oil preparations, namely triglycerides and ethyl esters containing, respectively, 30.02% and 74.38% of omega-3 fatty acids, were employed as the substrates for transesterification. Catalyzed by immobilized lipase using imidazolium-based ionic liquid systems, the total content of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in the resulting triglyceride reached 63.60% when 4% hydrophobic ionic liquid was used, which was 11.74% higher than that of the triglyceride produced in a solvent-free reaction system. The activation energy of the product (triglyceride-type fish oil) was 173.64 KJ mol −1 , which was not significantly different from that of the commercial ethyl ester-type fish oil, so were the other thermal oxidative kinetic parameters. The kinetic parameters depicting the thermal and oxidative stability of the fish oil product provide the basis for industrial processing, storage, and applications.
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PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2019
·
IF 4.561
Yi Li,Songwei Zhang,Qi Ding,Baofeng Qin,Litian Hu
Ionic liquids (ILs) are extensively used in many fields owing to their attractive characteristics. Good structure designability provides ILs an opportunity to integrate multiple functions into their structures, which could promote their industrial applications as versatile materials. In this study, three 4, 6-dimethyl-2-mercaptopyrimidine (DMMP) based phosphonium ILs were firstly synthesized. The corrosion inhibition behaviors of these ILs for mild steel in 0.5 M H 2 SO 4 aqueous solutions were investigated by electrochemical tests. Results indicated that all of the three ILs exhibited surprising inhibition efficiencies as high as 99%, even at an ultralow concentration of 0.1 mM. The ILs' adsorption behavior on surface obeys Langmuir isotherm, indicating that the ILs inhibit corrosion of mild steel by monolayer adsorption on the mild steel surface. Moreover, due to the superior adsorption capacity on steel surface, DMMP based ILs are expected have great application potentials as high-performance lubricating materials. As expected, DMMP based ILs showed excellent lubrication performances both at 30 °C and 100 °C as compared to PAO and 1-butyl-3-methylimidazolium tetrafluoroborate (LB104). Surface analyses indicated that tribofilms consist of ILs adsorption layer and tribochemical products, such as FeS, Fe 2 O 3 and organic compounds containing C O bonds, are responsible for the predominant lubrication performances. Therefore, versatile ILs designed in this paper have gathered two significant abilities for industrial applications, which are high corrosion inhibiting properties and excellent lubrication performances. This work is believed to be instructive for designing multifunctional ILs and promoting the ILs' application in industry in the future.
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 11
·e5180
·
IF 3.259
Xiao Sha,Xiaoli Sheng,Yuming Zhou,Beibei Wang,Yonghui Liu,Jiehua Bao
A newfangled cross-linked dual Brønsted acidic ternary mesoporous poly (ionic liquids)(MPILs) with mesoporous structure was successfully synthesized with divinylbenzene as cross linker, 1-vinyl-3-butyl imidazole bromide and sodium p-styrene sulfonate as functional group through an ordinary post-modification method and anion exchange process. A sponge-like mesoporous tunnel structure was observed and the obtained P (BVS-SO 3 H)-SO 3 CF 3 sample appeared a relatively high thermal stability, a large surface area (up to 286.8 m 2 /g) and great pore volume (0.73 cm 3 /g). The abundant dual acidic group of sulfonic acid and trifluoromethanesulfonic acid of the composite in the polymer framework impart Brønsted acidity. For the sake of demonstrating our claims, the sample has been used as a novel solid acid catalyst for the reaction of alkylation of o-xylene with styrene to 1-diphenylethane (PXE). Under optimal reaction conditions (reaction under 120 °C for 3 hr, catalyst amount was 0.5 wt% of the reaction system, and the mass ratio of o-xylene/styrene was 7.5:1, a 100% conversion of styrene and 93.7% PXE yield was acquired. After four times recycle, the yield remains 53.3%. Comparing with the commercial liquid acid catalyst, it processing a higher catalytic property and recyclability. Moreover, this fresh dual acidic heterogeneous catalyst owning a promising future applied in other acidic catalytic reactions and provide a new method to modify catalyst.
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Yinge Bai,Ruiyi Yan,Wenhui Tu,Jianguo Qian,Hongshuai Gao,Xiangping Zhang,Suojiang Zhang
Five kinds of carboxyl-functionalized quaternary ammonium ionic liquids (ILs), tricaprylmethylammonium succinate ([A336]Suc), tricaprylmethylammonium aspartate ([A336]Asp), tricaprylmethylammonium glutamate ([A336]Glu), tricaprylmethylammonium trifluoroacetate ([A336]TFA), and tricaprylmethylammonium phthalate ([A336]Pha), with strong hydrophobicity and hydrogen bond basicity were used to separate methacrylic acid (MAA) and acetic acid (HAc) from an aqueous solution. [A336]Suc shows better extraction performance than the other ILs because of the stronger hydrogen bonding basicity. Even though HAc shows the antagonistic effect on the extraction of MAA, the selectivity of MAA to HAc is achieved 54.70 for [A336]Suc at the optimized extraction conditions. The molecular mechanism of the extraction by IL is revealed by combining FT-IR and quantum chemical calculations. The results indicate that multiple hydrogen bonds are presented in the IL–acid complex which plays an important role in the acid extraction. Meanwhile, the computational studies demonstrate that the preferential extraction of MAA to HAc by [A336]Suc originated from the difference in the strength of the hydrogen bonding interaction between carboxylate group of ILs and acid.
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APPLIED CATALYSIS A-GENERAL
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2017
·
IF 4.339
Yuan Ma,Ci Chen,Tengfei Wang,Jingshun Zhang,JiaJia Wu,Xiangdong Liu,Tiegang Ren,Li Wang,Jinglai Zhang
The efficient fixation of CO 2 without co-catalyst and solvent under metal-free condition is still an urgent topic in sustainable chemistry. In this work, a series of dialkylpyrazolium ionic liquids are employed to promote the cycloaddition of CO 2 and PO to produce PC. They would be easily synthesized by a simple one-pot reaction. The effect of alkyl chain length in cation and different anion is explored. Diethylpyrazolium iodide presents the excellent catalytic activity with the product yield of 96% and selectivity of 99% in a benign condition. Moreover, the catalyst could be reused for at least five times without significant loss of catalytic activity. An intensive structure-activity research testifies that the cycloaddition of CO 2 with PO is activated by a synergistic effect from both cation and anion of ILs. To confirm it, the detailed mechanism is investigated by density functional theory associated with the non-covalent interactions and atoms in molecule analysis. Besides the electrostatic interaction between cation of ionic liquid and PO, the noncovalent interaction, especially for hydrogen bond, plays a vital role in promoting the reaction.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2012
·
IF 2.237
Rulong Li,Huabin Xing,Qiwei Yang,Xu Zhao,Baogen Su,Zongbi Bao,Yiwen Yang,Qilong Ren
This paper presents an extensive study on the feasibility of ionic liquids (ILs) for the extractive separation of a 1-hexene/n-hexane mixture. Seventeen ILs were tested at 313 K. The extraction selectivities of 1-hexene to n-hexane were in the range 1.5–3.0. The chemical structures of anion and cation in ILs greatly affected the extraction, and the functional groups, such as carbon–carbon double bond, nitrile, ester, and amide, in the ILs led to higher selectivities. The increase of alkyl chain length in cation led to the increase of extraction capacity of 1-hexene. To increase the distribution of 1-hexene in IL phase, silver salt was added to the ILs. It was found that ILs containing silver salt had a high distribution of 1-hexene, as well as high selectivity of 1-hexene against n-hexane. The extraction efficiency increased with the concentration of silver salt in ILs. When the initial feed concentration of 1-hexene was smaller, the selectivity of 1-hexene to n-hexane was higher. A simple mathematical model has been developed to describe the total 1-hexene content in the reaction media under study, on the basis of the formation of complexes between silver and 1-hexene with different stoichiometry. This work proves that the ILs can act as effective extractants in 1-hexene/n-hexane separation.
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高影响因子
危险品化学品经营许可证（带存储）