JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Wenyang Fan,Houchun Yan,Huiwen Huang,Yixin Ma,Jun Gao,Dongmei Xu,Yinglong Wang
For separating the special phenolic compound 2,6-xylenol from the model coal tar, the liquid–liquid equilibrium data regarding the four mixtures (toluene + 2,6-xylenol + glycerol/ethylene glycol/1,4-butanediol/1,3-propanediol) were measured at 303.15 K under pressure 0.1 MPa. The separation performance of the selected solvents was assessed by distribution coefficient (D) and separation factor (S). The experimental and calculated results showed that glycerol and ethylene glycol were suitable solvents. Meanwhile, the reliability of the measured data was checked by the Hand and Othmer–Tobias methods. In addition, the NRTL and UNIQUAC thermodynamic models were adopted to correlate the experimental data with the calculated values of root-mean-square deviation (RMSD) and absolute average relative deviation (AARD) lower than 0.01. The consistency of the regressed binary interaction parameters was verified using a tool GUI-MATLAB.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Wenjie Xiong,Mingzhen Shi,Lingling Peng,Xiaomin Zhang,Xingbang Hu,Youting Wu
CO 2 and H 2 S are considered impurities in natural gas that moderate the pace of environmental health. Developing highly efficient and cost-effective absorbents is of significance for sweetening natural gas. Herein, four superbase protic ionic liquids (SPILs) were prepared in this study. Typical physical properties (density, viscosity, and decomposition temperature) were also examined at ambient pressure. These SPILs show low viscosity values at ranging from 5.1 cP to 18.3 cP at 313.2 K. The solubility of H 2 S (0–1.0 bar), CO 2 (0–1.0 bar), and CH 4 (0–5.0 bar) was systematically measured at temperatures in the range of 298.2 K to 333.2 K. Impressively, the absolute solubility of H 2 S under 0.1 bar was found to be located at 4.31–5.15 mol/kg at 313.2 K, which is the highest value obtained among the reported results in the literature. The ideal selectivity of H 2 S/CH 4 and CO 2 /CH 4 (H 2 S or CO 2 solubility at 0.1 bar vs CH 4 solubility at 1 bar) at 313.2 K are in the ranges of 367–653 and 92.4–240, respectively. The interaction mechanism we explored was characterized by NMR and FT-IR spectroscopy. Thermodynamic parameters, such as enthalpy, Gibbs free energy, and entropy of dissolution were calculated from the temperature dependent solubility using the “deactivated model”. These SPILs are promising alternative candidates for the simultaneous removal of H 2 S and CO 2 in natural gas upgrading.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Guoxing Liao,Lei Chen,Yunjie Zhang,Oleksandr O. Mykhaylyk,Paul D. Topham,Daniel T.W. Toolan,Matthew J. Derry,Jonathan R. Howse,Qianqian Yu,Guiju Feng,LinGe Wang
Block copolymer-based nanoproducts including particles, fibers and films show promise in high-end applications including nanotemplating, nanolithography , and nanoporous membranes due to their advantageous self-assembled structure. However, few studies probe the nanofabrication process in detail and monitor the concomitant self-assembled structural transitions. Herein, time-resolved small-angle X-ray scattering (SAXS) is exploited to follow such nanostructural changes. Evaporation-induced casting, electrospraying or electrospinning, followed by a final solvent vapor annealing step, have been used to create a series of nanoproducts with reversibly tunable morphologies from a model block copolymer, polystyrene- b -poly(ethylene- co -butylene)- b -polystyrene (SEBS). During evaporation-induced casting, which is considered as an unconfined system, a selective (co)solvent system composed of tetrahydrofuran (THF) and dimethylformamide (DMF) can lead to the formation of various SEBS structures. For DMF-based unconfined systems, the final SEBS lamellar structures were found to be different from the structure formed from THF only, demonstrating the critical role of solvent selection in evaporation-induced casting. The comparison of SEBS electrospun fibers reveals the unique and complex self-assembled structural transition occurring in a confined system. Time-resolved SAXS studies of our model triblock copolymer provide guidelines for a more general approach to access various nanostructures from self-assembling block copolymers.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED RADIATION AND ISOTOPES
·
2024
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IF 1.6
Yue Li,Yongqiang Zhang,Guoqiang Zhong,Wenjing Pu,Wei Lu,Weihua Wang
Liquid scintillator consists of an organic solvent and one or more scintillation solutes, which can emit light pulses after absorbing X- and γ-rays, or high-energy particles. It has the characteristics of strong neutron/γ-ray (n/γ) discrimination, short decay time, unlimited size and low cost, which plays an important role in high-sensitivity and large-scale radiation detection, especially in the construction and safe operation of nuclear facilities. However, the impact of solvent selection and moisture content on the fluorescence-scintillation properties of scintillators has not been adequately investigated in the literature. In this study, liquid scintillators consisting of scintillation solutes, 2, 5-diphenyl-oxazole and 1, 4-bis (5-phenyl-2-oxazolyl) benzene, were prepared with different moisture contents, which were determined using the Karl-Fischer method. The fluorescence emission spectra, scintillation sensitivity and n/γ discrimination were systematically characterized using various solvents with corresponding moisture contents. The results show that the scintillation count rate and n/γ discrimination reach their maximum values when employing p -xylene as the solvent and maintaining moisture content below 20 ppm. The theoretical calculation elucidates the performance degradation of liquid scintillators induced by moisture.
研究领域:
核物理
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辐射探测
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2021
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IF 6.158
Zhen Cheng,Lei Ni,Junjie Wang,Juncheng Jiang,Hang Yao,Qiang Chen,Fusheng Cui,Wei Jiang,Shuliang Ye
The synthesis of Grignard reagents, which are formed by the reaction of magnesium and organic halides (RX), is hazardous because of the highly exothermic nature of this reaction. In this work, calorimetry and infrared (IR) spectroscopy were used to identify the exothermic mechanism and process hazards for the synthesis of n -butylmagnesium bromide Grignard reagent ( n -BuMgBr) in diethyl ether (DE), tetrahydrofuran (THF), 2-methyltetrahydrofuran (2-MeTHF), cyclopentylmethyl ether (CPME), and diethylene glycol butyl ether (DGBE). The latter three solvents were chosen by the substitution principle of the “inherent safety” design concept, which aims to reduce the risk of the target reaction in a fundamental manner. An EasyMax102 calorimeter was used to characterize the exothermic behavior of the reactions using isothermal and isoperibolic experiments carried out in a semi-batch glass reactor coupled with an IR probe to monitor changes in the species and concentrations during the reaction process. An adiabatic TAC-500A calorimeter was also used to understand the adiabatic decomposition behavior of the products obtained in the isothermal experiments under the worst-case (cooling failure and thermal runaway) scenario. Meanwhile, density functional theory calculations were performed to understand the reaction pathway and associated energies based on the experimental data. Further, the risk assessment of thermal runaway was analyzed using a risk matrix and a Stoessel criticality diagram. The results indicate that the risk of the reactions when using 2-MeTHF, CPME, and DGBE are all class 1, making reactions in these solvents inherently safer than those using DE or THF, which were both class-3 risks. These findings provide further evidence that 2-MeTHF, CPME, and DGBE are safer than the typical solvents used for the industrial production of Grignard reagents.
研究领域:
化学工程
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安全科学
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理论化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Zhe Wang,Jiangjiang Feng,Xiaoliang Li,Rena Oh,Dongdong Shi,Ouardia Akdim,Ming Xia,Liang Zhao,Xiaoyang Huang,Guojie Zhang
TiO 2 nanocrystals with controlled facets have been extensively investigated due to their excellent photocatalytic performance in sustainable and green energy field. However, the applications in thermal catalysis without applying UV irradiation are comparably less and the identification of their intrinsic roles, especially the different catalytic behaviors of each crystal facet, remains not fully recognized. In this study, bimetallic AuPd nanoparticles supported on anatase TiO 2 nanosheets exposing {0 0 1} facets or TiO 2 nanospindles exposing {1 0 1} as a catalyst were prepared by sol-immobilization method and used for solvent-free benzyl alcohol oxidation . The experimental results indicated that the exposed facet of the support has a significant effect on the catalytic performance. AuPd/TiO 2 -001 catalyst exhibited a higher benzyl alcohol conversion than that of the AuPd/TiO 2 -101. Meanwhile, all the prepared AuPd/TiO 2 catalysts were characterized by XRD , ICP-AES, XPS, BET, TEM, and HRTEM . The results revealed that the higher number of oxygen vacancies in TiO 2 -sheets with the exposed {0 0 1} facets of higher surface energy could be responsible for the observed enhancement in the catalytic performance of benzyl alcohol oxidation. The present study displays that it is plausible to enhance the catalytic performance for the benzyl alcohol oxidation by tailoring the exposed facet of the TiO 2 as a catalyst support.
研究领域:
催化
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材料科学
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化学工程
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Weiyan Yu,Na Du,Wanguo Hou
Monolayer nanosheets of CO 3 2− -type layered double hydroxides (LDHs) have many special applications, but their fabrication is challenging. Herein, Co 2 Al-CO 3 and Co 2 Fe-CO 3 LDH nanosheets were synthesized via a solvothermal method. 31 solvents with different characteristic parameters, including the surface free energy ( γ ) and solubility ( δ ) parameters were chosen, to explore the correlation between the formation of monolayer LDHs (ML-LDHs) and the characteristic parameters of solvents. The results reveal that when the solvents used have the characteristic parameters matching to those of the LDHs, CO 3 2− -type ML-LDHs with a thickness of ca. 1 nm can be obtained. The mixed-solvent strategy can provide the effective solvents for the synthesis of ML-LDHs. The dispersions of CO 3 2− -type ML-LDHs can be stable for at least six months without obvious precipitation. In addition, it is demonstrated that the δ parameters of LDHs can be calculated from the γ parameters via the molar volume-free γ – δ equations developed previously. Furthermore, a new parameter called “surface free energy distance” is introduced, which can be used for screening effective solvents for the synthesis of ML-LDHs. To the best of our knowledge, this is the first time to investigate the applicable of the characteristic parameter matching principle for the bottom-up synthesis of ML-LDHs. This work deepens the understanding on the feature of CO 3 2− -type LDHs and provides a solvent selection strategy for the synthesis of CO 3 2− -type ML-LDHs.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 7
·4193-4202
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IF 12.732
Xiaoli Wu,Xulin Cui,Qi Wang,Jingtao Wang,Wenjia Wu,Wenpeng Li,Zhongyi Jiang
Two-dimensional (2D) lamellar membranes with well-defined channels show great promise in molecular separation. The mass transfer paths include both interlayer and cross-layer channels; however, previous studies mainly focused on interlayer channels. Herein, g-C3N4 nanosheets with various lateral sizes and thicknesses were edge-functionalized by hydrophilic (–OH) or hydrophobic (–OOCCH3) groups and utilized as building blocks for lamellar membranes. In this way, the hydrophilicity, length, and thickness of cross-layer channels were subtly tuned. We demonstrated that the cross-layer channels display a ‘gate effect’ to govern molecular selectivity while the interlayer channels determine the molecular transport rate. Membranes with hydrophilic/hydrophobic heterostructured channels acquire highly elevated polar solvent permeance and polar/nonpolar solvent selectivity, and this ‘gate effect’ can be intensified by increasing the thickness and total length of the cross-layer channels. The acetonitrile permeance and acetonitrile/toluene separation factor reach as high as 2128 L m−2 h−1 bar−1 and 12.7, respectively. This study may represent the first example to identify the contribution of cross-layer channels within lamellar membranes, paving a way to designing efficient 2D nanochannel membranes.
研究领域:
材料科学
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化学工程
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Xiaomin Qiu,Yuanyuan Shen,Zhengkun Hou,Qi Wang,Zhaoyou Zhu,Yinglong Wang,Jingwei Yang,Jun Gao
Octane and p -xylene are common components in crude gasoline, so their separation process is very important in petroleum industry . The azeotrope and near azeotrope are often separated by extractive distillation in industry, which can realize the recovery and utilization of resources. In this work, the vapor–liquid equilibrium experiment was used to obtain the vapor–liquid equilibrium properties of the difficult separation system, and on this basis, the solvent extraction mechanism was studied. The mechanism of solvent separation plays a guiding role in selecting suitable solvents for industrial separation. The interaction energy, bond length and charge density distribution of p -xylene with solvent are calculated by quantum chemistry method. The quantum chemistry calculation results and experiment results showed that N -formylmorpholine is the best solvent among the alternative solvents in the work. This work provides an effective and complete solvent screening process from phase equilibrium experiments to quantum chemical calculation. An extractive distillation simulation process with N -formylmorpholine as solvent is designed to separate octane and p -xylene. In addition, the feasibility and effectiveness of the intensified vapor recompression assisted extraction distillation are also discussed. In the extractive distillation process , the vapor recompression-assisted extraction distillation process is globally optimal. Compared with basic process, the total annual cost can be reduced by 43.2%. This study provides theoretical guidance for extractive distillation separation technology and solvent selection.
研究领域:
化工分离技术
·
石油工业
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 1
·51418
·
IF 3.125
Lan Hao,Xulin Cui,Xiaoli Wu,Jingtao Wang,Yifan Li,Wenpeng Li,Xingzhong Cao,Haoqin Zhang
Efficient separation of aromatic-aliphatic hydrocarbon mixtures has long been an important topic in chemical industries. Organic nanofiltration (OSN) has been revealing great promise in separating solvent mixtures that has not been effectively resolved by the state-of-the-art technologies. Herein, novel OSN membranes are designed for the separation of toluene and n -heptane. Polyamide active layer with diaminonaphthalene as the aqueous phase monomer is prepared by interfacial polymerization for the first time. The addition of polydimethylsiloxane gutter layer, as well as the combination of spin coating technique and macroporous substrate, renders the membranes with loose and defect-free architectures. The as-designed membranes achieve a rather high selectivity of toluene over n -heptane (>4) together with ultra-high toluene permeance (>180 L m −2 h −1 bar −1 ). These membranes also present excellent stability in the long-term operation.
研究领域:
材料科学
·
膜分离技术
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化学工程
·
纳米技术
·
高分子化学
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工业催化
·
绿色化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）