Asia-Pacific Journal of Chemical Engineering
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2021
·Vol. 16
·期 3
·e2609
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IF 1.447
Siliang Gao,Wencheng Tang,Ming Zhao,Siyuan Qie,Weiwei Pang,Longsheng Tian
Highly efficient separation of benzene, toluene, and xylenes (BTXs) from pyrolysis gasoline is very important in petrochemical industries. Though the extractive distillation (ED) process is simpler and consumes less energy compared with liquid–liquid extraction process, it is difficult for a single solvent, for example, sulfolane, to achieve both high purity and high yield of BTXs. In this work, methylsulfonylethane (MSE) was chosen as a cosolvent to improve the selectivity of sulfolane after solvent screening, and factors that may affect the selectivity of the composite solvent were fully investigated, such as the content of cosolvent, solvent to feed ratio, the composition of the feed, and temperature. Furthermore, 240 h of continuous extractive distillation and solvent recovery experiment was carried out using sulfolane (85 wt%)–MES (15 wt%) mixture as solvent. The purity of mixed aromatics obtained was 99.83%, and the yield was as high as 99.7%.
研究领域:
化学工程
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石油化工
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Hui Wang,Qinbo Wang,Zhenhua Xiong,Chuxiong Chen,Binwei Shen
By using the synthetic method, the solubilities of benzoic acid in binary methylbenzene + benzyl alcohol solvent mixtures at (301.05 to 355.65) K and in binary methylbenzene + benzaldehyde solvent mixtures at (301.05 to 354.45) K were determined at atmospheric pressure. The studied mass fractions of benzyl alcohol and benzaldehyde in the corresponding binary solvent mixtures range from 0.0 to 1.0. It was found that the measured solubilities increase with the increase of temperature at constant solvent composition. For the ternary system benzoic acid + methylbenzene + benzyl alcohol, the results show that the binary methylbenzene + benzyl alcohol solvent mixture with the mass fraction of benzyl alcohol at 0.80 has the best dissolving capacity for benzoic acid at constant temperature. However, for the ternary system benzoic acid + methylbenzene + benzaldehyde, the results show that the binary methylbenzene + benzaldehyde solvent mixture with the mass fraction of benzaldehyde of 0.20 has the best dissolving capacity for benzoic acid at constant temperature. The experimental data were correlated by both the nonrandom two-liquid (NRTL) and the Apelblat equations, and the correlated solubilities agree satisfactorily with the experimental observations. By coupling the Apelblat equation with the Clark and Glew equation, the thermodynamic functions for the two studied solid–liquid equilibrium systems, including dissolution enthalpy, entropy, Gibbs energy, and isobaric heat capacity, were calculated and discussed.
研究领域:
物理化学
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热力学
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DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
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2018
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IF 2.795
Chen Lu,Jiaming Hu,Yuning Meng,Aidong Zhou,Feng Zhang,Zhibing Zhang
To resolve the defects of acetic acid solvents for the liquid-phase oxidation of toluene to benzaldehyde with oxygen, a low-corrosive and green method was developed by introducing benzyl benzoate into the reaction. It was found that compared with the case of acetic acid, benzyl benzoate showed gratifying effect on the oxidation of toluene to benzaldehyde. The reaction was more active in the initial stage of oxidation, and the generated benzaldehyde was protected from further oxidation due to the synergistic effect of benzyl benzoate along with toluene-derived products benzyl alcohol and benzyl bromide. Benzyl benzoate inhibited the esterification of benzyl alcohol, while benzyl bromide promoted the formation of benzyl alcohol. Therefore, considerable benzyl alcohol concentration could be maintained and high benzaldehyde selectivity could be achieved under high toluene conversion.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
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2023
·Vol. 52
·期 7
·762-789
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IF 1.2
Li Min,Zhang Xiaocheng,Yu Yingmin,Liu Lanmu
The extractive distillation was used to separate ethylbenzene and m-xylene. After the solvent screening, 1,2,4-trichlorobenzene was chosen as the extractive solvent. The vapor–liquid equilibrium (VLE) of binary mixtures of m-xylene, ethylbenzene, and 1,2,4-trichlorobenzene was measured at 101.33 kPa. The measurements were taken with a modified Rose equilibrium still. The Wisniak’s test was used to assess the thermodynamic consistency of the VLE experimental results. To obtain the binary interaction parameters, the binary VLE experimental data were correlated with the NRTL, Wilson, and UNIQUAC activity coefficient models. The results showed that three models all fit the experimental values of three binary systems well, and the ternary VLE data of m-xylene + ethylbenzene + 1,2,4-trichlorobenzene were estimated using Aspen Plus V11 based on these model parameters. The experimental data agree well with the estimation values generated from three models. Finally, the effect of 1,2,4-trichlorobenzene as an extractant was analyzed, and it is proved to have a good influence on the separation of ethylbenzene from mixed xylenes by extractive distillation.
研究领域:
化学工程
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分离技术
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DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 18
·4279
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IF 3.2
Cong Peng,Yuhang Liu,Duo Chen,Zhanjun Wu
To impart high flame resistance, enhanced thermal stability, and low dielectric properties to epoxy resin while maintaining good mechanical behaviors for high-end applications, a monomer (BZPN) containing the characteristic structure of benzoxazine, phthalonitrile, and trifluoromethyl was prepared and added into the Bisphenol A-type epoxy resin (DGEBA)/Dapsone (DDS) combination. The glass transition temperature (T g ) and carbon yield under a nitrogen atmosphere at 800 °C were found to significantly increase from 155 °C, 17.2% to 236 °C, 50.3%, respectively, for the neat EP/DDS and the BZPN-containing material. The UL-94 flammability rating achieved V-0 level when the BZPN content was 19.2 wt.% (EP-BZ-1). The thermal decomposition and flame retardancy mechanism were explored by TGA-FTIR, Raman, and XPS analysis. The fluorine-containing products were found in both the gas phase and the char residue, implying that the •CF 3 radicals played an important role in promoting the flame-retardant behaviors through a radical trapping mechanism. The dielectric constant and dielectric loss of the materials decreased as anticipated. In addition, mechanical testing of carbon fiber-reinforced composites showed that the BZPN-containing resin presented equivalent mechanical behaviors to the neat EP/DDS resin. The synthesized BZPN was proved to be an effective and promising additive for the epoxy-based composite.
研究领域:
高分子化学
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材料科学
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复合材料
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阻燃材料
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介电材料
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热功能材料
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产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2019
·Vol. 11
·期 6
·1610-1614
·
IF 4.495
Qiao Han,Peidong Li,Yanfei Zhang,Peng Lu,Li Xu,Hongchen Guo,Lei Xu
Graphical Happy couple ! The coupling of methanol dehydrogenation and side-chain alkylation of toluene realizes high selective conversion of toluene with methanol into styrene (ST) and ethylbenzene (EB) by composite catalysts combining CsX with methanol dehydrogenation components, wherein the thermodynamic driving force for dehydrogenation of methanol was a key point for the coupling reaction. A new strategy, the coupling of methanol dehydrogenation and side-chain alkylation of toluene, to realize highly effective conversion of methanol and toluene into styrene and ethylbenzene was proposed. A series of composite catalysts were designed by combining CsX with numerous catalysts reported to be effective for methanol dehydrogenation to formaldehyde. The studies of side-chain alkylation of toluene with methanol over these composite catalysts indicated that the introduction of methanol dehydrogenation components could universally improve the yield of styrene and ethylbenzene in side-chain alkylation of toluene with methanol. And the introduction of some methanol dehydrogenation components, i. e. sodium borate (Na 2 B 4 O 7 ) and CuO/SiO 2 , could even double the yield of styrene and ethylbenzene. Furthermore, the influence of the mass ratio of different components and the spatial arrangement of different active sites on composite catalysts was investigated in detail.
研究领域:
催化化学
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能源化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Yunfei Xue,Xiaogang Gu,Shuguang Lu,Zhouwei Miao,Mark L. Brusseau,Minhui Xu,Xiaori Fu,Xiang Zhang,Zhaofu Qiu,Qian Sui
The ability of Fe(II)-activated calcium peroxide (CaO 2 ) to remove benzene is examined with a series of batch experiments. The results showed that benzene concentrations were reduced by 20–100% within 30 min. The magnitude of removal was dependent on the CaO 2 /Fe(II)/Benzene molar ratio, with much greater destruction observed for ratios of 4/4/1 or greater. An empirical equation was developed to quantify the destruction rate dependence on reagent composition. The presence of oxidative hydroxyl radicals (HO ) and reductive radicals (primarily O 2 − ) was identified by probe compound testing and electron paramagnetic resonance (EPR) tests. The results of the EPR tests indicated that the application of CaO 2 /Fe(II) enabled the radical intensity to remain steady for a relatively long time. The effect of initial solution pH was also investigated, and CaO 2 /Fe(II) enabled benzene removal over a wide pH range of 3.0–9.0. The results of radical scavenging tests showed that benzene removal occurred primarily by HO oxidation in the CaO 2 /Fe(II) system, although reductive radicals also contributed. The intermediates in benzene destruction were identified to be phenol and biphenyl. The results indicate that Fe(II)-activated CaO 2 is a feasible approach for treatment of benzene in contaminated groundwater remediation.
研究领域:
环境科学
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化学工程
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DOI
PubMed
高影响因子
MOLECULES
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2016
·Vol. 21
·期 11
·1574
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IF 2.465
Xing Wang,Yong-Fei Chen,Wei Yan,Ling-Ling Cao,Yong-Hao Ye
A series of benzimidazole phenylhydrazone derivatives (6a–6ai) were synthesized and characterized by1H-NMR, ESI-MS, and elemental analysis. The structure of6bwas further confirmed by single crystal X-ray diffraction as (E)-configuration. All the compounds were screened for antifungal activity againstRhizoctonia solaniandMagnaporthe oryzaeemploying a mycelium growth rate method. Compound6fexhibited significant inhibitory activity againstR. solaniandM. oryzaewith the EC50values of 1.20 and 1.85 μg/mL, respectively. In vivo testing demonstrated that6fcould effectively control the development of rice sheath blight (RSB) and rice blast (RB) caused by the above two phytopathogens. This work indicated that the compound6fwith a benzimidazole phenylhydrazone scaffold could be considered as a leading structure for the development of novel fungicides.Keywords:benzimidazole;phenylhydrazone;antifungal activity
研究领域:
植物病理学
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药物化学
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DOI
PubMed
高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
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2013
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IF 0.559
Ping Yu,Qilong Sun,Jianming Pan,Zhenjiang Tan,Jiangdong Dai,Yongsheng Yan,Feng Cheng
Poly(styrene–divinylbenzene)/Fe3O4 (Fe3O4@St–DVB) magnetic porous polymer microspheres based on suspension polymerization were prepared for adsorption of 2, 4-dichlorophenol (2, 4-DCP) and 2, 6-dichlorophenol (2, 6-DCP) from aqueous solution. The as-prepared product was characterized by Fourier transform infrared spectroscopy, Raman, X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, differential thermal analysis and elemental analysis. The results showed that the composite material has both porous and magnetic characteristics, which aid in faster separation and increase in adsorption capacity. The adsorption performance of the Fe3O4@(St–DVB) magnetic porous microspheres was manifested by batch mode adsorption experiments with respect to pH, initial concentration, contact time and temperature. The adsorbent was found to be sensitive to changes in pH, and the adsorption capacity of 2, 4-DCP is higher than that of 2, 6-DCP. The kinetics experimental data fitted well with the pseudo-second-order model, as three steps belonged to the pseudo-second-order adsorption process. The adsorption isotherms were also described by the Langmuir and Freundlich isotherm models, respectively. It was found that the Langmuir isotherm model fitted the equilibrium data superior to the Freundlich model. Thermodynamic parameters were calculated by the Gibbs free energy function, confirming that adsorption process was spontaneous and endothermic. In addition, the reusability performance of the Fe3O4@(St–DVB) magnetic porous microspheres was demonstrated by four repeated cycles.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
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IF 3.5
Sihang Lu,Jiahui He,Wenkai Chen,Gui Chen,Haiwei Tang,Yiwen Xiao,Bailin Xiang,Haizhou Zhang,Ye Yuan
An effective approach for the production of high-value benzyl alcohol (BOL) and benzaldehyde (BAL) via solvent-free liquid-phase oxidation of toluene with O 2 over CeO 2 –MnO 1.68 @CeOHCO 3 catalysts has been established in this work. The catalyst was formed using the interfacial oxidation-reduction method with the CeOHCO 3 as the template. Compared with CeOHCO 3 , MnO 2 and CeO 2 , the catalytic performance of CeO 2 –MnO 1.68 @CeOHCO 3 was significantly improved in the oxidation of toluene, with the activity could be maintained over five consecutive reaction runs. The catalytic performance of the toluene oxidation has been improved due to the synergistic effect of the Mn and Ce species of the catalyst. Under optimum reaction conditions, 6.7 % toluene conversion was achieved with an excellent level of selectivity for the target products (69.7 % selectivity to BOL and BAL). This study may reveal a new approach to the preparation of high value-added aromatic alcohols and aldehydes through the liquid-phase catalytic oxidation of aromatic hydrocarbons in the solvent- and additive-free.
研究领域:
催化
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化学合成
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材料科学
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有机化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 55
·期 4
·1614-1626
·
IF 3.442
Pan Liuyi,He Yulong,Niu Menglong,Dan Yong,Li Wenhong
Ni 2 P catalysts supported on different supports, such as SiO 2 from different sources, Al 2 O 3 , TiO 2 and ZrO 2 were prepared for the hydrodeoxygenation of p-cresol (monocyclic phenol model in coal tar). The reaction was carried out on a fixed-bed reactor at a temperature of 330–390 °C under 2 MPa. The order of conversion of p-cresol was as follows: Ni 2 P/SiO 2 -2 > Ni 2 P/SiO 2 -3 > Ni 2 P/SiO 2 -1 > Ni 2 P/Al 2 O 3 > Ni 2 P/ZrO 2 > Ni 2 P/TiO 2 . Ni 2 P/SiO 2 -3 shown higher DDO path selectivity, resulting in the conversion of p-cresol of 93% and a selectivity of 72.6% for BTX products under the reaction temperature of 370 °C with LHSV of 0.5 h −1 . This catalyst was also used for the hydrodeoxygenation of the crude phenolic mixture extracted from coal tar, which shown that the phenol deoxidation rate was 87.6% and the BTX product selectivity was 73.7% by GC–MS.
研究领域:
化学工程
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催化反应
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DOI
高影响因子
POLYMER TESTING
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2022
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IF 4.931
Xiaoqian Xu,Mingzhen Xu,Tian Liu,Dengxun Ren,Xiaobo Liu
Promoted polymerization of Phthalonitrile containing benzoxazine (BA-ph) was designed on basis of the catalysis performance of a type of aniline curing agent (2,6-bis(4-aminophenoxy)benzonitrile (BAB)). The curing processes and curing behaviors of BA-ph with BAB were investigated by differential scanning calorimetry (DSC) and gelatin time. With the assistance of orthogonal test analysis method, main factors that affected the pre-polymerization of BA-ph were studied and the appropriate pre-polymerization conditions were determined. According to the results of dynamic rheological analysis (DRA) and Fourier transform infrared spectroscopy (FTIR), possible curing mechanism of BA-ph with BAB were proposed. The results show that BAB could reduce the prepolymerization temperature of BA-ph resin, and increase its polymerization rate and crosslinking degree, and the BA-ph/BAB polymer mainly formed the aromatic heterocyclic structure of triazine rings, phthalocyanine rings and polyisoindoline rings. Then, thermal stability of BA-ph (BAB15%) polymers pretreated at different temperatures and prepared at 200 °C was analyzed to understand the cross-linked structures. Results indicated that BA-ph (BAB15%) polymers exhibit outstanding thermal properties ( T 5% >410 °C and integral program decomposition temperature ( IPDT ) reached 3342 °C). Mechanical properties and thermomechanical properties of glass fiber reinforced BA-ph composites were also investigated and exhibited excellent mechanical properties, to further reveal the effects of BAB on the polymerization of BA-ph resin and expand the application of high-performance resin-based composites.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）