Journal of the Taiwan Institute of Chemical Engineers
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2019
·
IF 3.834
Liang Ren,Jianxin Chen,Chongbin Wang,Qing Lu,Jian Han,Hong Wu
A novel triptycene based polyamide (TPA) thin film composite (TFC) nanofiltration (NF) membrane was successfully synthesized via interfacial reaction between piperazine (PIP) and mixed acyl chloride on porous support film. Specifically, the mixed acyl chloride was made up of a rigid 3D-symmetric contorted monomer, triptycene-2,3,6,7,14,15-hexaacyl chloride (THC) and a conventional non-contorted planar monomer, trimesoyl chloride (TMC). Based on the contorted structure and low reactivity, the THC could enhance microporosity, hydrophilicity and surface negative charge of prepared membrane. When the mass ratio of THC equaled to 40%, an excellent NF membrane was acquired, the water permeance was 21.4 L m −2 h −1 bar −1 as well as the Na 2 SO 4 rejection was above 95%. Moreover, the TPA-40 also showed high divalent to monovalent ions selectivity and long-term operating stability. The TPA TFC NF membrane had potential application in seawater reverse osmosis (SWRO) pretreatment.
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JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
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2019
·Vol. 96
·期 8
·955-965
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IF 1.72
Jiaojiao Fang,Ting Zheng,Zhenyu Wu,Lihang Wu,Qinglong Xie,Fan Xia,Meizhen Lu,Yong Nie,Jianbing Ji
Epoxidized oils are eco-friendly plasticizers, which are industrially produced through the epoxidation reaction in a formic acid-hydrogen peroxide autocatalyzed system. The fundamental knowledge to describe the phase equilibrium of systems after epoxidation reaction is lacking, which is crucial for the design of the purification facilities. This work reported experimental data for the liquid–liquid equilibrium of three systems, i.e., epoxidized fatty acid methyl esters + formic acid + water, epoxidized fatty acid 2-ethylhexyl esters + formic acid + water, and epoxidized soybean oil + formic acid + water, in the temperature range (303.15–348.15) K under atmospheric pressure. The results indicated that the liquid–liquid equilibrium constant of formic acid in the systems followed the order of epoxidized fatty acid 2-ethylhexyl esters > epoxidized fatty acid methyl esters > epoxidized soybean oil. Moreover, the obtained experimental data were correlated using nonrandom two liquid (NRTL) and universal quasi chemical (UNIQUAC) models. The maximum root mean square deviation (RMSD) values as low as 0.0052 and 0.0263 were estimated using the NRTL and UNIQUAC model, respectively. The NRTL model is more suitable than the UNIQUAC model to describe the liquid–liquid equilibrium behavior of these ternary systems.
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THERMOCHIMICA ACTA
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2018
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IF 2.189
Chao Su,Chenyang Zhu,Tianwang Lai,Tao Wang,Xiangyang Liu,Maogang He
New experimental densities and viscosities data for binary mixtures of methyl decanoate plus n -heptane were reported at temperatures of (298.15, 308.15 and 318.15) K and pressures of (0.1–15) MPa. The expanded uncertainty for density measurement is estimated to be 2 kg m −3 and the relative expanded uncertainty for viscosity measurement is estimated to be 0.03. A fitting equation was proposed to correlate the density of the binary mixture and Grunberg-Nissan equation was used to predict the viscosity of the binary mixture, respectively. The maximum absolute relative deviations between the experimental results and calculation values for densities and viscosities were 0.11% and 5.94%, respectively.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
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IF 4.61
Guanyi Chen,Ruixue Zhang,Wenchao Ma,Bin Liu,Xiangping Li,Beibei Yan,Zhanjun Cheng,Tiejun Wang
The catalytic cracking upgrading reactions over HZSM-5 of different model compounds of bio-oil have been studied with a self-designed fluid catalytic cracking (FCC) equipment. Typical bio-oil model compounds, such as acetic acid, guaiacol, n-heptane, acetol and ethyl acetate, were chosen to study the products distribution, reaction pathway and deactivation of catalysts. The results showed: C 6 –C 8 aromatic hydrocarbons , C 2 –C 4 olefins , C 1 –C 5 alkanes, CO and CO 2 were the main products, and the selectivity of olefins was: ethylene > propylene > butylene . Catalyst characterization methods, such as FI-IR, TG-TPO and Raman, were used to study the deactivation mechanism of catalysts. According to the catalyst characterization results, a catalyst deactivation mechanism was proposed as follows: Firstly, the precursor which consisted of a large number of long chain saturated aliphatic hydrocarbons and a small amount C C of aromatics formed on the catalyst surface. Then the active sites of catalysts had been covered, the coke type changed from thermal coke to catalytic coke and gradually blocked the channels of the molecular sieve, which accelerated the deactivation of catalyst.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2015
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IF 2.587
Xiao-dong Tang,Yong-fen Zhang,Jing-jing Li,Yuan-qiang Zhu,Da-yong Qing,Ya-xin Deng
Deep eutectic solvents (DESs), which were prepared by using AlCl3, chlorinated paraffins-52, and various aromatics, show excellent desulfurization performance to various thiophenic sulfur compounds. In DESs, aromatic compounds strongly influence the desulfurization performance, and the order is toluene > p-xylene > o-xylene > ethylbenzene > benzene > chlorobenzene. The DESs containing toluene (DES-T) can deeply remove the three thiophenic sulfur compounds, that is, 3-methylthiophene, benzothiophene, and dibenzothiophene, within 10 min at 293 K. The extractive desulfurization mechanism is considered to be a π–π interaction of the aromatic ring along with the acid–base complexation. Satisfactorily, the extractive desulfurization is still effective for real oils, and real oil quality is improved in this process.
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Biomed Research International
·
2015
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IF 1.579
Mingjie Deng,Meiling Zhang,Fa Sun,Jianshe Ma,Lufeng Hu,Xuezhi Yang,Guanyang Lin,Xianqin Wang
Gas chromatography-mass spectrometry (GS-MS) in combination with multivariate statistical analysis was applied to explore the metabolic variability in urine of chronically hydrogen sulfide- (H2S-) poisoned rats relative to control ones. The changes in endogenous metabolites were studied by partial least squares-discriminate analysis (PLS-DA) and independent-samples t-test. The metabolic patterns of H2S-poisoned group are separated from the control, suggesting that the metabolic profiles of H2S-poisoned rats were markedly different from the controls. Moreover, compared to the control group, the level of alanine, d-ribose, tetradecanoic acid, L-aspartic acid, pentanedioic acid, cholesterol, acetate, and oleic acid in rat urine of the poisoning group decreased, while the level of glycine, d-mannose, arabinofuranose, and propanoic acid increased. These metabolites are related to amino acid metabolism as well as energy and lipid metabolism in vivo. Studying metabolomics using GC-MS allows for a comprehensive overview of the metabolism of the living body. This technique can be employed to decipher the mechanism of chronic H2S poisoning, thus promoting the use of metabolomics in clinical toxicology.
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COMBUSTION SCIENCE AND TECHNOLOGY
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2013
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IF 1.011
Ming-Di Li,Zhong Wang,Yang Zhao,Rui-Na Li,Shuai Liu
An experimental study was reported on premixed ethanol/n-heptane/oxygen/argon flames at low pressure (4.655 kPa) with ethanol blending ratios of 0 (Flame 1), 15% (Flame 2), and 30% (Flame 3). The equivalence ratio was 1.0. Flame species were identified using molecular beam mass spectrometry with tunable synchrotron photoionization. The flame temperature profiles were measured with a Pt-6%Rh/Pt-30%Rh thermocouple. The mole fraction profiles of major and intermediate flame species under different ethanol ratios were analyzed in this article. Experimental results showed that the temperature profiles of measured flames fall almost on a single curve, which means that ethanol had little effect on flame temperature. The peak mole fraction of the main combustion products occurred 2–6 mm above the burner. With the increase of ethanol blending ratios, the mole fractions of H2, CO, and CO2 decreased, the mole fraction of H2O increased, and the mole fractions of intermediate combustion products (C2H2, C2H4, HCHO, C3H3) decreased. During the combustion process, the oxygen atom of ethanol partly replaces the O2, thus the final mole fraction of O2 increased with the increase of ethanol ratios.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2015
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IF 2.729
Meiling Zhang,Congcong Wen,Yuan Zhang,Fa Sun,Shuanghu Wang,Jianshe Ma,Kezhi Lin,Xianqin Wang,Guanyang Lin,Lufeng Hu
This study aims to evaluate the effect of ketamine on rats by examining the differences in serum metabolites between ketamine abuse group (Ket-group) and control group (Con-group). Compared to the Con-group, the level of phosphate, propanoic acid, ribitol and d -fructose of the Ket-group increased after continuous intraperitoneal administration of ketamine for 7 days, while the level of alanine, glycine, butanoic acid, valine, l -serine, l -proline, mannonic acid, octadecanoic acid and cholesterol decreased. After 14 days’ administration, the level of alanine, butanoic acid, valine, l -leucine, phosphate, l -serine, l -threonine, propanetricarboxylic acid, hexadecanoic acid and oleic acid of the ketamine group increased while the level of mannonic acid, octadecanoic acid and cholesterol decreased. After stopping ketamine administration for 2 days, the level of butanoic acid, phosphate, aminomalonic acid, gluconic acid, hexadecanoic acid, oleic acid and arachidonic acid of Ket-group increased, while the level of glycine, l -lysine and cholesterol decreased. This study can provide invaluable information for the metabolites changes due to ketamine abuse.
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ANALYST
·
2015
·Vol. 140
·期 9
·3107-3112
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IF 4.107
Ye-Yu Wu,Cheng-Xiong Yang,Xiu-Ping Yan
The unique properties of metal–organic frameworks, such as diversity in structures and pore sizes, high surface area, shape selectivity and available to functionality make them as potential materials of the stationary phase for gas chromatography. Here we show an in situ growth approach to the fabrication of zeolite imidazolate framework-90 (ZIF-90) bonded capillary column for gas chromatography separation. ZIF-90 was directly grown onto the inner wall of the carboxyl modified capillary via the coordination between Zn(II) and carboxyl group. The fabricated ZIF-90 bonded capillary column acted as a weak polar stationary phase. It not only exhibits high capacity in the separation of linear molecules, but also offers excellent features for the separation of 2- and 3-substituted ketones.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2014
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IF 2.045
Zhuqiang Yang,Qincheng Bi,Yong Guo,Zhaohui Liu,Jianguo Yan,Qiang Zhang
The densities of endothermic hydrocarbon fuel at supercritical pressure condition are measured online using a radial measurement method. The densitometer is based on the attenuation theory of gamma ray using a count rate mode. One advantage of the method is that it is noninstrusive and practical for a small tube measurement. The densitometer was measurably optimized for the design and calibrated by the reference fluids with different density ranges. A kind of endothermic hydrocarbon fuel was measured covering the temperature from (283 to 950) K at the supercritical pressures of (3.0 and 4.0) MPa. The data were regressed with polynomial equations and the isobaric thermal expansion could be obtained by the fitted density curve.
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Soft Matter
·
2015
·Vol. 11
·期 14
·2885-2892
·
IF 4.029
Dashuang Fan,Peizhu Zheng,Yuanming Ma,Tianxiang Yin,Jihua Zhao,Weiguo Shen
The concentration-dependent enthalpies of mixing for water/sodium bis(2-ethylhexyl)-sulfosuccinate (AOT)/n-alkane microemulsions with different water contents ω0 and chain lengths n of n-alkane were determined by isothermal titration microcalorimetry (ITC) and flow-mixing microcalorimetry at 298.15 K and used to calculate the interaction enthalpies (−ΔHC) between the droplets. It was found that −ΔHC increased with ω0, and changed from negative to positive at about ω0 = 10. The investigation of the dependence of −ΔHC on n revealed that the values of −ΔHC were negative and had a minimum for ω0 = 5; while they were positive and had a maximum for ω0 = 15. These phenomena were discussed based on the competition of the overlapping contribution of the surfactant tails between two neighbouring droplets and the penetration contribution of the solvent molecules into the surfactant tails. These results indicated the important role of entropy in the stability of the microemulsion systems.
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ENZYME AND MICROBIAL TECHNOLOGY
·
2014
·
IF 2.966
Chuan-Yang Shang,Wei-Xun Li,Rui-Feng Zhang
ZnO nanowires were successfully introduced into a macroporous SiO 2 by in situ hydrothermal growth in 3D pores. The obtained composites were characterized by SEM and XRD, and used as supports to immobilize Candida antarctica lipase B (CALB) through adsorption. The high specific surface area (233 m 2 /g) and strong electrostatic interaction resulted that the average loading amount of the composite supports (196.8 mg/g) was 3–4 times of that of macroporous SiO 2 and approximate to that of a silica-based mesoporous material. Both adsorption capacity and the activity of the CALB immobilized on the composite supports almost kept unchanged as the samples were soaked in buffer solution for 48 h. The chiral resolution of 2-octanol was catalyzed by immobilized CALB. A maximum molar conversion of 49.1% was achieved with 99% enantiomeric excess of ( R )-2-octanol acetate under the optimal condition: a reaction using 1.0 mol/L ( R , S )-2-octanol, 2.0 mol/L vinyl acetate and 4.0 wt.% water content at 60 °C for 8 h. After fifteen recycles the immobilized lipase could retain 96.9% of relative activity and 93.8% of relative enantioselectivity .
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