INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Xiaoda Wang,Qinglian Wang,Changshen Ye,Xiaolian Dong,Ting Qiu
This paper aims to present the feasibility of conducting the transesterification of propylene glycol ether (PM) with methyl acetate (MeAc) in a reactive distillation (RD) column to improve the reaction conversion. The essential thermodynamic and reaction kinetic data of the reaction system were measured for the feasibility study. There is only one azeotrope, MeAc–MeOH, in the reaction system, and the NRTL model could describe well the thermodynamic behavior of this system. The transesterification of PM with MeAc is an endothermic reaction with activation energy E = 55.704 kJ·mol–1. The feasibility was analyzed by residue curve maps (RCM), showing that full conversion of PM could be realized by RD with a mole ratio of MeAc–PM larger than 2.882. The intensification effect was experimentally verified in a batch RD column. Finally, some important parameters are given through the conceptual design to develop a continuous RD column for the transesterification of PM with MeAc.
研究领域:
化学工程
·
反应动力学
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Ping Lu,Huaifang Li,Mantian Li,Jie Chen,Changshen Ye,Hongxing Wang,Ting Qiu
In this work, acidic ionic liquid (AIL) was grafted into NH 2 -UiO-66 through acid-base interaction. And the novel heterogeneous catalyst x AIL@NH 2 -UiO-66 ( x means the mass ratio of AIL to NH 2 -UiO-66) was first applied in the field of biodiesel production. The optimal catalyst 3AIL@NH 2 -UiO-66 with good wettability (with reactants) and high acidity was prepared successfully. Accordingly, the 3AIL@NH 2 -UiO-66 can be widely applied in biodiesel production from different raw materials. The conversion of free fatty acids (FFAs) in esterification was above 90%, as well as the biodiesel yield in transesterification was above 80%, showing excellent catalytic activities of 3AIL@NH 2 -UiO-66. And the 3AIL@NH 2 -UiO-66 also revealed excellent reusability, with the conversion of oleic acid decreases from 96.86% to 90.42% after 6 runs. In addition, the interaction between any two of the three factors (catalyst dosage, reaction time and molar ratio) on the oleic acid conversion was revealed with 3D response surface technology. By the mechanism investigation, the good wettability with reactants and high acidity of the catalysts are identified as key factors for biodiesel production. The method of anchoring ionic liquids with organic linkers for the application of MOFs in biodiesel production offers abundant possibilities.
研究领域:
化学工程
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催化材料
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可再生能源
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Ngoc Khanh Tran,Duraisamy Senthil Raja,Yen-Te Lee,Tien Khoa Le,De-Hao Tsai
Glycerol carbonate (GLC) offers a range of benefits including biodegradability , versatility, and its potential for carbon capture and utilization. Base catalysts play a crucial role for GLC synthesis by facilitating the activation of reactants, enhancing nucleophilicity , accelerating reaction kinetics, and enabling catalyst regeneration . In this study, metal–organic framework (MOF) derived hybrid structure, CaO-MgO@Al 2 O 3 , was developed as a base catalyst to promote transesterification of glycerol with dimethyl carbonate (DMC) to form GLC. The results show that hydrothermal plus wet-impregnation routes formed the hybrid nanostructure with homogenously dispersed Ca, Mg and Al elements. Further, the synthesized catalysts showed significantly high specific surface area and basicity (2.656 mmol g −1 ). High selectivity (>99 %) and high GLC yield (96.2 %; 208.9 mmol g-cat −1 ) were achievable. This study demonstrated the rational design concept of MOF-derived hybrid structures used in the enhancement of base catalysis for transesterification of DMC to GLC, offering an effective solution with mild reaction conditions and high conversion.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 61
·35014-35022
·
IF 2.936
Menglu Song,Xiangui Yang,Gongying Wang
γ-Al2O3 loaded with potassium nitrate (KNO3/Al2O3) catalysts were prepared, characterized and employed as a type of heterogenous solid base catalyst in the synthesis of polycarbonate (1,4-butane carbonate)-diol (PBC–OH) via the transesterification of dimethyl carbonate (DMC) and 1,4-butanediol (BD). The relationship between physicochemical properties and catalytic performance for KNO3/Al2O3 in this transesterification reaction was investigated using various techniques. The results demonstrated that the performance of KNO3/Al2O3 catalysts was highly influenced by basic site amount and strength. The medium and strong basic sites were beneficial for this reaction. The catalyst with a KNO3 loading of 35% and a calcination temperature of 700 °C exhibited the best catalytic activity due to its highest basic site amount and appropriate base strength. The highest BD conversion and PBC–OH yield of 80.2% and 68.4% were obtained under optimal reaction conditions. Also, this solid base catalyst was successfully employed in the synthesis of copolycarbonate diols from DMC and two different diols. Different scanning calorimetry results indicated that the thermal properties of the copolycarbonate diols can be adjusted by regulating the average segment lengths, Mn and copolymer composition structure.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 38
·26700-26708
·
IF 3.9
Zhenglong Zhao,Wenwang Wu,Lihua Jia,Xiangfeng Guo
The efficient sodium phosphate (Na3PO4) solid base catalysts were prepared and applied in the production of novel biodiesel: ethylene glycol monomethyl ether monolaurate (EGMEML) by transesterification. The calcined sodium phosphate catalysts (NaP-T) were characterized using thermogravimetry analysis (TG-DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) and so on. The effects of calcination temperature of Na3PO4 and main reaction parameters such as molar ratio of ethylene glycol monomethyl ether (EGME) to methyl laurate (ML), dosage of catalyst, reaction time and temperature on the yield of EGMEML were examined. The results showed that the maximum yield of EGMEML could reach 90% under 120 °C within 4 h and 5 wt% of Na3PO4 calcined at 400°, and the catalysts displayed good stability and recovery. In addition, the kinetics of transesterification reaction was explored and the results showed that the transesterification reaction followed 1st order kinetics when a large excess of EGME was used, the activation energy (Ea) was found to be 40.2 kJ mol−1.
研究领域:
化学工程
·
可再生资源与环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Xiaoda Wang,Xin Xu,Qinglian Wang,Zhixian Huang,Jianyang He,Ting Qiu
This work studied the flow pattern and reaction kinetics for fatty acid methyl ester (FAME) synthesis through transesterification of palm oil with methanol in a microchannel reactor. It was observed in the experiments using a high-speed camera that the flow pattern evolved along the microchannels due to the coalescence of adjacent droplets. This coalescence phenomenon had significant effects on the variation trend of FAME yield along the microchannels. The influences of catalyst concentration, reaction temperature, and reactant molar ratio on the flow pattern were systematically investigated. It was the first successful attempt to determine the kinetics data for the transesterification of palm oil with methanol in the first 120 s, owing to the use of microchannel reactors. A pseudo-homogeneous model was used to describe the reaction kinetics of FAME synthesis in microchannels. This model performed well at the condition that the reaction equilibrium was reached before the occurrence of droplet coalescence.
研究领域:
化学工程
·
生物化工
✓ 已验证
产品关联
DOI
高影响因子
Journal of Oleo Science
·
2020
·
IF 1.304
Zhihao Wang,Ying Chen,Jiahe Zhao,Guoliang Gao,Worawan Panpipat,Ling-Zhi Cheong,Cai Shen
Present study has successfully synthesized melamine-based covalent organic polymers (MCOPs) and applied it as lipase carrier for recyclable esters hydrolysis and transesterification. The synthesized MCOPs are composed of dense nanosheet structures having a thickness of 3.5 nm. Three immobilization methods namely physical adsorption, cross-linking and carrier activation were employed to prepare the MCOPs-immobilized CRL. Cross-linked MCOPs-immobilized CRL (41.30 mg protein/g MCOPs) and carrier activated MCOPs-immobilized CRL (33.20 mg protein/g MCOPs) had higher enzyme loading as compared to physical absorb MCOPs-immobilized CRL (29.30 mg protein/g MCOPs). Nevertheless, physical absorb MCOPs-immobilized CRL demonstrated the highest esters hydrolysis (49.85 U) and transesterification (1.04 U) activities. Despite having the highest enzymatic activity, physical absorb MCOPs-immobilized CRL were not able to maintain its catalytic stability with more than 30% decreased in enzymatic activity during consecutive hydrolysis and transesterification activities. Meanwhile, cross-linked MCOPs-immobilized CRL demonstrated highest catalytic stability with highest enzymatic activities at the end of consecutive reactions. All the MCOPs-immobilized CRL can be easily recovered and reused through centrifugation with more than 85% of recovery rate.
研究领域:
生物化学
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材料科学
·
酶工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
·
2015
·Vol. 117
·期 8
·1171-1178
·
IF 1.812
Shangde Sun,Bingxue Hu,Fanfan Song,Yanlan Bi
Glyceryl ferulates (GMF + GDF, combination of glyceryl monoferulate and glyceryl diferulate), and feruloylated acylglycerols (FMAG + FDAG, combination of feruloylated monoacylglycerols, and feruloylated diacylglycerols) are hydrophilic and lipophilic derivatives of ferulic acid (FA), which can be used as antioxidants and UV absorbers in food and other fields. In this study, the effect of ionic liquids (ILs) and organic solvents on the enzymatic transesterification of ethyl ferulate (EF) with monostearin was investigated. The effects of reaction time, temperature, and enzyme load on EF conversion and reaction selectivity were also evaluated and optimized using response surface methodology. Among ILs tested, high EF conversion (98.4 ± 0.5%), and reaction selectivity for GMF + GDF (0.81) were obtained in [Emim]TF 2 N; and for organic solvents tested, EF conversion (72.7 ± 1.5%) and reaction selectivity (0.75) were achieved in n-hexane. Results also showed that, compared with n-hexane, [Emim]TF 2 N can improve the selective synthesis of GMF + GDF, and [Emim]TF 2 N also shows significant protection on the enzyme inactivation at high temperature (90°C). The activation energies (Ea) of hydrolysis to form GMF + GDF and transesterification to form FMAG + FDAG were 51.98 and 43.49 kJ/mol in [Emim]TF 2 N, 72.35, and 53.11 kJ/mol in n-hexane, respectively. , , and in [Emim]TF 2 N were 0.01, 0.19 mol/L, and 4.13 × 10 −4 mol/(L · min), respectively. Practical applications: In this work, FMAG + FDAG and GMF + GDF were prepared by enzymatic transesterification of EF with monostearin. During the reaction, the competitive reaction of the hydrolysis of monostearin to form hydrophilic GMF + GDF and the transesterification of monostearin and EF to form lipophilic FMAG + FDAG take place in parallel. The effect of ionic liquids (ILs) and organic solvents on the competitive reaction was investigated. Compared with organic solvent (n-hexane), IL ([Emim]TF 2 N) is apt to the formation of hydrophilic GMF + GDF; and [Emim]TF 2 N shows remarkably protective effect on the inactivation of enzyme at high temperature up to 90°C than that (65°C) of n-hexane. This study can give information about the influence of different reaction media on the enzymatic transesterification and reaction selectivity. Enzymatic transesterification of ethyl ferulate (EF) with monostearin to produce hydrophilic glyceryl monoferulate (GMF)+glyceryl diferulate (GDF) and lipophilic feruloylated monoacylglycerols (FMAG)+feruloylated diacylglycerols (FDAG) in ionic liquids or organic solvents.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2024
·
IF 5.5
Yueyue He,Huaigang Cheng,Zihe Pan,Xiangping Zhang
Heterogeneous catalysts can avoid the problem of difficult separation and recovery of homogeneous catalysts in transesterification reactions, but there is a lack of basis for process optimization because the quantitative influence mechanism of supports is not clear. In this work, we firstly attempt to make a comprehensive comparation on the effect of potassium fluoride (KF) catalysts on various supports (carbonates and oxides of cerium, magnesium and calcium) on the transesterification reaction, especially on the kinetics. According to the results, oxide-supported catalysts are significantly more active than carbonate-supported catalysts because they have more active sites. When oxides were used as supports, KF/MgO exhibited good activity because of its stronger basicity and higher number of active sites on the surface. Under the same process conditions, the stability time of KF/CeO 2 , KF/CaO and KF/MgO catalysed transesterification reaction was 240 min, 90 min and 30 min, respectively. KF/MgO achieved a conversion of 68.0 %. The activation energies of the KF/CeO 2 , KF/CaO and KF/MgO catalysed transesterification reaction were 22.22 kJ/mol, 15.93 kJ/mol and 15.80 kJ/mol, respectively. The surface alkalinity of KF/MgO increased the frequency of molecular collisions of the reactants and exhibited a faster reaction rate.
研究领域:
催化化学
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材料科学
·
反应工程学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Xin Gao,Yiwei Wang,Rui Wang,Chengna Dai,Biaohua Chen,Jiqin Zhu,Xingang Li,Hong Li,Zhigang Lei
1,2-Butene carbonate (BC) is an important five-membered cyclic carbonate with a high commercial value, but its massive production is limited by the lack of raw material 1,2-butanediol (1,2-BDO). 1,2-BDO is coproduced with ethylene glycol (EG) in the hydrogenation process in the coal-to-EG route, one-pot conversion of biomass to liquid fuels and chemicals, and fermentation of broths. However, the separation and purification of 1,2-BDO are difficult. In this paper, an intensified reactive distillation process for the separation of the EG and 1,2-BDO azeotropic mixture via dimethyl carbonate assisted chemical looping technology and coproduction of BC and EG products is proposed. The transesterification reactions of EG and 1,2-BDO were investigated individually in the presence of basic resin catalyst KIP321, and the kinetic parameters were imbedded into Aspen plus (V11) for the design of the reactive distillation column to perform the transesterification process. The proposed flowsheet, which includes the transesterification unit, a DMC and methanol separation unit, and an EG recovery unit, was designed and simulated. Remarkably, the conversions of diols are over 0.998, the yield of 1,2-butylene carbonate is 99.86%, and the yield of the EG product is theoretically 100%, which shows excellent potential for industrial application.
研究领域:
化学工程
·
工艺化学
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催化
·
分离技术
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Tengjie Wang,Wenkai Li,Xuehui Ge,Ting Qiu,Xiaoda Wang
High-purity ethylene carbonate (EC) is widely used as battery electrolyte, polycarbonate monomer , organic intermediate, and so on. An economical and sustainable route to synthesize high-purity ethylene carbonate (EC) via the transesterification of dimethyl carbonate (DMC) with ethylene glycol (EG) is provided in this work. However, this reaction is so fast that the reaction kinetics, which is essential for the industrial design, is hard to get by the traditional measuring method. In this work, an easy-to-assemble microreactor was used to precisely determine the reaction kinetics for the fast transesterification of DMC with EG using sodium methoxide as catalyst. The effects of flow rate, microreactor diameter, catalyst concentration, reaction temperature, and reactant molar ratio were investigated. An activity-based pseudo-homogeneous kinetic model, which considered the non-ideal properties of reaction system, was established to describe the transesterification of DMC with EG. Detailed kinetics data were collected in the first 5 min. Using these data, the parameters of the kinetic model were correlated with the maximum average error of 11.19%. Using this kinetic model, the kinetic data at different catalyst concentrations and reactant molar ratios were predicted with the maximum average error of 13.68%, suggesting its satisfactory prediction performance.
研究领域:
化学工程
·
材料科学
·
反应动力学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Jie Chen,Huiyao Huang,Wangquan Gong,Yi Chen,Rong Dong,Limei Ren,Ting Qiu
Ethyl methyl carbonate (EMC) is a crucial solvent extensively utilized in lithium-ion battery electrolytes; the transesterification of dimethyl carbonate (DMC) with ethanol is a pivotal reaction for EMC production. However, this reaction faces challenges due to the trade-off between catalytic activity and selectivity from the basic catalysts. In this issue, we report an innovative strategy through fine-tuning the electron-donor capability of the basic phenolate anion ([PhO]) in a novel poly(ionic liquid) (PIL) framework, as synthesized via an alkylation reaction between 1,3,5-tris(bromomethyl)benzene, biphenyldiimidazole, and N,N′-carbonyldiimidazole (CDI) to trigger targeted basicity that can directionally catalyze the transesterification of DMC with ethanol, so as to achieve both ultrahigh catalytic activity and selectivity toward EMC. By varying the substituent groups with electron-withdrawing and electron-donating effects on the phenolate anion, the PILs show expected changes in the catalytic performance, following well with the trend of charge density on these substituted phenolate anions. The optimized catalyst [CPIL-CDI][MeOPhO], induced by p-methoxyphenolate anions, allows an extraordinary EMC yield of 72.19% and an EMC selectivity of 91.48% under mild conditions without any process intensifications, suppressing all of the reported catalysts reported to date. Outcomes and approaches shown in this work have the potential to expedite the systematic design of cations and anions within PILs for industrial-scale EMC production through environmentally friendly transesterification processes.
研究领域:
化学
·
材料科学
·
催化
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）