CARBOHYDRATE POLYMERS
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2015
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IF 4.074
Wenbo Chai,Xiaoyan Liu,Junchen Zou,Xinying Zhang,Beibei Li,Tiantian Yin
Pomelo peel (PP), as one of the well-known agricultural wastes, is cost-effective and environmentally friendly. Based on PP, two new kinds of oil sorbents were prepared by using acetic anhydride and styrene. The structures of raw pomelo peel (RP), acetic anhydride-treated pomelo peel (AP) and styrene-treated pomelo peel (SP) were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM), contact-angle (CA) measurements. The optimum reaction conditions for preparation of AP and SP were also investigated. The resulting products exhibited better oil sorption capacity than that of RP for diesel and lubricating oil, also SP had better oil sorption capacity than AP, while the oil sorption capacities of SP for diesel and lubricating oil reached 18.91 and 26.36 g/g, respectively. Adsorption kinetics was well described by the pseudo-second-order model. The results indicated that AP and SP, especially SP could be used as the substitute for non-biodegradable oil sorption materials.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
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2025
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IF 2.1
Mingzhe Li,Yuyang Zhou,Hua Zhou,Dingqiang Lu
Vitamin E is an important fat soluble antioxidant, its acetate is the main derivative product of vitamin E. Using metal organic framework material ZIF-8 as a catalyst, vitamin E acetate (VEA) was prepared by catalyzing the esterification reaction of D-α-tocopherol and acetic anhydride in a solvent-free system. Firstly, the preparation conditions of metal organic framework materials were studied: different imidazole ligands, different zinc ion ligands, molar concentration ratio of Zn2+ to 2-methylimidazole(2-mIM), and preparation time. The results showed that the catalytic performance of ZIF-8 was optimal when Zn(CH3COO)2·2H2O was used as the zinc source, 2-mIM was used as the imidazole ligand, the molar concentration ratio of Zn2+ / 2-mIM was 1:20, and the preparation time was 1 hour. The yield of vitamin E acetate was 86.85%. The synthesis process of VEA was optimized by single factor experiments such as substrate molar ratio, reaction time, dosage of nano enzyme, reaction temperature and so on. The results showed that the yield of vitamin E acetate reached 96.31% under the optimal conditions of n (D-α-tocopherol) =1mmol, [n (D-α-tocopherol) : n (Acetic anhydride)] =1:15, reaction time 24 h, ZIF-8 dosage 0.05 g, reaction temperature 50 °C.
研究领域:
化学
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生物学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
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IF 3.141
Zichao Guo,Wei Feng,Shiran Li,Peng Zhou,Liping Chen,Wanghua Chen
To prevent thermal runaway incidents in semibatch reactors (SBRs), designing thermally safe operating conditions should be considered first. Regretfully, determination of the reaction kinetics for organic reactions is a time-consuming and money-consuming process, especially in the fine chemical and pharmaceutical industries. Therefore, it is desirable to develop kinetic-parameter-free methods that can design the right operating conditions. Along this line, a new facile approach to design thermally safe operating conditions for isoperibolic homogeneous SBRs has been developed in this article. This approach is developed on the basis of deep insights into the phenomenon that the MTSR vs reaction temperature profiles for isothermal exothermic reactions present an “S” shape. The approach has been experimentally validated using the hydrolysis reaction of acetic anhydride. However, more work should be carried out to extend this method to more complex reaction systems, like consecutive reactions.
研究领域:
化学工程
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安全工程
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产品关联
DOI
高影响因子
ORGANIC PROCESS RESEARCH & DEVELOPMENT
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2022
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IF 3.858
Wenshuai Bai,Dayu Zhang,Xingyu Wen
In the fine and pharmaceutical chemical industries, the operation of highly exothermic reactions with the autocatalytic feature needs great caution. Identification of the autocatalytic behavior for a given reaction is of signification importance. In this work, first, an autocatalytic mathematic model for the acetic anhydride hydrolysis reaction is established. Then, a series of experiments at an approximate mole ratio of acetic anhydride to water with the solvent of acetic acid are designed to study this reaction by reaction calorimetry. Third, the six isothermal experiments are used to fit the kinetic constants, and the fitting result is very good and reasonable when compared to the published literature. Besides, it is proven that this reaction also has an autocatalytic feature at an approximate mole ratio of acetic anhydride to water. Last, the determined kinetic constants are also verified by two experiments operating under isoperibolic conditions.
研究领域:
化学工程
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精细化工
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2017
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IF 1.174
Ze Dong,Liping Chen,Yingying Ma,Haoliang Peng,Wanghua Chen
In the field of adiabatic correction for complex reactions, a simple one-stage kinetic model was used to estimate the real reaction kinetics. However, this assumption simplified the real process, inevitably generated inaccurate or even unsafe results. Therefore, it was necessary to find a new correction method for complex reactions. In this work, esterification of acetic anhydride by methanol was chosen as an object reaction of study. The reaction was studied under different conditions by Reaction Calorimeter (RC1). Then, Thermal Safety Software (TSS) was used to establish the kinetic model and estimate the parameters, where, activation energies for three stages were 67.09, 81.02, 73.77 kJˑmol − 1 respectively, and corresponding frequency factors in logarithmic form were 16.05, 19.59, 15.72 s − 1 . In addition, two adiabatic tests were performed by Vent Sizing Package2 (VSP2). For accurate correction of VSP2 tests, a new correction method based on Enhanced Fisher method was proposed. Combined with kinetics, adiabatic correction of esterification reaction was achieved. Through this research, accurate kinetic parameters for a three-step kinetic model of the esterification reaction were acquired. Furthermore, the correlation coefficients between simulated curves and corrected curves were 0.976 and 0.968, which proved the accuracy of proposed new adiabatic correction method. Based on this new method, conservative corrected results were able to be acquired and be applied in safety assessment.
研究领域:
化学工程
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反应动力学
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过程安全
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Zhijia Liao,Zhenyu Yuan,Hongliang Gao,Fanli Meng
In response to the pressing demand for acetic anhydride gas detection, this study introduces a novel gas sensor for precisely detecting acetic anhydride concentrations. The optimum conditions for the synthesis of cobalt hydroxyfluoride/cobalt oxide (CHFCO) heterojunctions with good acetic anhydride gas sensitivity were determined by carefully adjusting the calcination time, hydrothermal time and ammonium fluoride content. The best performing composite CHFCO sensor with porous rod particles was tested at 180 ℃ and achieved a response rate of 260 for 100 ppm acetic anhydride gas, with response and recovery times of 60 and 40 s, respectively. In comparison to other prepared sensors, the detection response for acetic anhydride was improved by a factor of 4.30–23.63. Moreover, the CHFCO sensor reliably detected acetic anhydride at a concentration of 500 ppb, exhibiting a response value of 1.56. Notably, the sensor demonstrated great selectivity, moisture resistance , and stability. The findings highlight the significant enhancements in gas-sensitive performance to acetic anhydride achieved by the abundant hydroxyl bonds on the surface of CHFCO heterojunction, the presence of fluorine ions , and the modulation of the band gap. These results provide valuable insights for the advancement of acetic anhydride gas sensors based on CHFCO heterojunction.
研究领域:
材料科学
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化学工程
✓ 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）