JOURNAL OF CATALYSIS
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2020
·
IF 7.888
Zifei Yan,Yunpeng Hu,Chencan Du,Jian Deng,Kai Wang,Guangsheng Luo
The acidolysis of epoxides is an important series reaction applied in the polymer industry including coating and rubber. Glycidyl neodecanoate, which is a green material of environmentally friendly coatings, is synthesized through the acidolysis reaction of epichlorohydrin (ECH) with neodecanoic acid. We developed a green catalyst named tetramethylammonium neodecanoate (TMAN) for this reaction. TMAN is totally recyclable and the reaction system can be homogeneous, thus combining the advantages of tertiary amines and quaternary ammonium salts, meanwhile eliminating their drawbacks. Comparing with tetramethylammonium chloride (TMAC) which is a traditional industrial catalyst, the amount of side product dichlorohydrin can be reduced by more than 50%, effective utilization of ECH and yield of the main product can be increased by 5% and 2% respectively, and the reaction time can be reduced by 20% or more. We suggested a main catalytic reaction network including the conversion of TMAN to TMAC at the late stage of the reaction, and TMAC can be easily recycled and reused to prepare TMAN. More importantly, after the replacement of material acid and the carboxylic anion of catalyst, this efficient catalytic system and the mechanism network can be applied to other acidolysis reactions of epoxides.
研究领域:
化学工程
·
绿色化学
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DOI
高影响因子
AICHE JOURNAL
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2022
·Vol. 68
·期 11
·e17791
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IF 4.167
Zifei Yan,Yubin Wang,Chencan Du,Jian Deng,Guangsheng Luo
Ring-opening of epoxides with carboxylic acids has been widely used to prepare many high value intermediates in the polymer and pharmaceutical industries. Most of conventional processes proceeded in batch stirred reactors. As such they always suffer from low productivity and selectivity. Here we developed an advanced technology to perform the ring-opening reaction of epichlorohydrin with neodecanoic acid (NDA) for continuous production of 3-chloro-2-hydroxypropyl neodecanoate in a more efficient and safer way. A microreaction system where a microreactor connected to a stirred reactor was established. When the conversion of NDA rapidly reaching around 90% in a microreactor at 110°C, the reaction solution was transferred to a stirred reactor at 90°C. This two-stage operating mode can reduce the reaction time and improve the selectivity through free switching of temperature in the consecutive two reactors, thus substantially reducing the consumption of energy and materials.
研究领域:
化学工程
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工业化学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Zifei Yan,Jian Deng,Yuchao Chen,Guangsheng Luo
2,3-Epoxypropyl neodecanoate (EPDA) is an important synthon of eco-friendly coatings, and its preparation methods and the relevant reaction mechanisms remain to be further studied. In this work, the two-step preparation method of EPDA is investigated. Under the optimized process conditions in the acidolysis reaction, 99% conversion of neodecanoic acid and 91–93% effective utilization rate of epichlorohydrin could be realized. In the following ring-closure reaction, the two-step alkali treatment was applied, and it can significantly reduce the treatment time and improve the yield of EPDA by 3–5%. Besides, the mechanism of the acidolysis reaction catalyzed by tetramethylammonium chloride is proposed. The two chemical reaction pathways are put forward to explain the formation of side product dichloropropanol. Two effective ways to control the side reactions are suggested, including the control of temperature in the range of 70–90 °C and reducing the concentration of inorganic chlorine in the reaction system.
研究领域:
化学工程
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有机合成
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环境科学
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产品关联
DOI
高影响因子
Protection of Metals and Physical Chemistry of Surfaces
·
2019
·Vol. 55
·期 3
·495-501
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IF 0.787
Lijun Chen,Shao Tantan,Gong Yilu,Wang Xiuming
The novel poly (VAC-VeoVa-HFMA-BZMA) latex was successfully prepared via semicontinuous seeded emulsion polymerization which vinyl acetate (VAc) and vinyl ester of neodecanoic acid (VeoVa10) were main monomer, hexafluorobutyl methacrylate (HFMA) and benzyl methacrylate (BZMA) were used as functional monomer. Dodecyl benzene sulfonic acid sodium (SDBS), octylphenol polyoxyethylene ether (OP-10) and potassium persulfate (KPS) were used to be mixed emulsifier and initiator, respectively. The structure of the resultant latex is determined by Fourier transform infrared spectroscopy spectrum (FTIR). The thermal performances of latex film are studied via the thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The average particle size of the latex is characterized by the dynamic light scattering(DLS).Water contact angle (WCA) is used to test the wetting property of the novel poly (VAC-VeoVa-HFMA-BZMA) latex film. The condition of synthesizing the latex was studied in detail. The optimum condition of preparing the novel latex is that the amount of emulsifier is 8.0% (wt %) and the mass ratio of SDBS to OP-10 is 2 : 1 and the mass ratio of main monomer VAc to VeoVa10 is 3 : 1. The amount of initiator is 0.8% and the amounts of HFMA and BZMA are 6.0 and 8.0% (wt %), respectively. Results indicate that the water resistance of the latex film and thermal stability are improved when the fluorine and BZMA monomers are added.
研究领域:
高分子化学
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材料科学
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应用化学
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功能材料
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纳米材料
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DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
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2023
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IF 7.4
Qian Zhang,Xin Miao,Jingwei Zhu,Junchen Wu,Miaolan Zhang,Qunchao Zhang,Dean Shi,Tao Jiang,Robert K.Y. Li
Concrete, which is commonly destroyed by erosion in adverse environments, cannot satisfy the demands of foundation construction engineering applications. The optimal way to ensure concrete's durability is to cover its surface with a barrier coating that prevents potentially harmful particles from penetrating the inside. Vinyl acetate polymers were applied as coatings owing to excellent flexibility and strong adhesion to the substrate. However, their hydrophilicity and low hardness will inevitably limit the usage in various areas, in particular the construction materials field. In this study, a method of modifying vinyl acetate polymers (PVAc) by vinyl triethoxysilane (VTES) and vinyl neononanoate (VeoVa-9), vinyl neodecanoate (VeoVa-10) in tertiary vinyl carbonates was reported to enhance the anticorrosion of concrete, where the former VTES could act a coupling agent, while the latter tertiary vinyl carbonates provide shielding against invasion through steric effect. Following modification, the hydrophilic PVAc becomes a hydrophobic coating with a contact angle as high as 98°; the coating's water absorption rate in one week is merely 1.25%; higher hardness and modulus were validated by nanoindentation measurements, while sandpaper friction and lap-shear trial indicated an enhancement in wear resistance and adhesion; three-electrode electrochemical analysis revealed that the modified coating has a 98% anti-corrosion efficacy, and its excellent anticorrosion performance is further confirmed by 480-hour salt spray test on reinforced concrete models.
研究领域:
土木工程
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材料科学
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化学工程
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产品关联
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
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2026
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IF 3.4
Guo Yun,Du Ming,Gao Yian,Zheng Yanqing,Du Linyan
This study introduces a sustainable and environmentally friendly process for selective co-extraction of Ni 2+ and Co 2+ from leaching solution of spent ternary lithium-ion batteries (LIBs) with neodecanoic acid (V10). The extraction conditions were systematically optimized, and a process for reducing extractant dissolution loss in the raffinate was specifically designed, with both the extraction and extractant recovery steps integrated into a continuous mixer-settler operation. Experimental results showed that under optimal conditions, the extraction efficiency of Ni and Co consistently exceeded 99.9%, and the concentrations of Li and Mg in the strip solution remained below 1 mg/L. This process achieved both ultra-high extraction of Ni and Co and deep separation from Mg and Li. Furthermore, the chemical oxygen demand (COD) of the raffinate was reduced from around 10,000 mg/L to below 1,000 mg/L, demonstrating the effectiveness of this method in significantly decreasing COD. In addition, the extraction mechanism and the mechanism for reducing extractant dissolution loss were also verified. This work provides insights for developing a potentially practical process based on the V10 extraction system to improve selective co-extraction of Ni and Co from complex solutions while reducing extractant dissolution loss.
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xintong Li,Xiaoya Li,Xin Ma,Zhanfang Cao,Hong Zhong,Shuai Wang
Manganese is a critical metal with widespread applications. The increasing demand for manganese, driven by the rapid growth of the electric vehicle and new energy sectors, has underscored the need for efficient separation and purification technologies, particularly from low-grade ores with high content of impurities. This study applies machine learning (ML) −driven quantitative structure–activity relationship (QSAR) modeling to investigate the Mn 2+ and Mg 2+ separation performance of 14 extractants. Key molecular descriptors were identified through principal component analysis and clustering heatmap method, and QSAR models were developed using ordinary least squares, nonlinear model, artificial neural network, random forest, and extreme gradient boosting (XGBoost) tree. The XGBoost model exhibited superior predictive accuracy for Mn 2+ and Mg 2+ extraction efficiencies and Mn 2+ /Mg 2+ separation selectivity. Feature importance analysis revealed that molecular properties related to hydrophilicity, electronic characteristics, and steric hindrance, as reflected by descriptors such as Clog P, OAV, Nonpolar S, VIP, Max P, and EI, play decisive roles in governing extraction efficiency and separation performance. Further NCI analysis demonstrated that the C–OH group of one α -hydroxyalkyl phosphinic acid ( α -HA) molecule forms a hydrogen bond with the C–OH group of another α -HA molecule, which likely accounts for the tendency of α -HA molecules to form dimers during solvent extraction. This interaction modulates the spatial arrangement of P–OH and P=O groups, enhancing both Mn 2+ extraction efficiency and Mn 2+ /Mg 2+ separation selectivity. These findings underscore the value of ML-driven QSAR modeling in predicting extractant performance, offering new mechanistic insights into Mn 2+ /Mg 2+ separation, and informing the development of novel extractants.
研究领域:
化学工程
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材料科学
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环境科学
✓ 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）