RENEWABLE ENERGY
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2021
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IF 8.001
Yi-Tong Wang,Wen-Jie Cong,Ya-Nan Zeng,Yu-Qing Zhang,Jing-Long Liang,Jun-Guo Li,Li-Qun Jiang,Zhen Fang
Direct production of biodiesel by both esterification and transesterification of renewable oils with acid value (AV) of 9.6–28.9 mg KOH/g using calcined blast furnace dust is studied. Blast furnace dust calcined at 600–700 °C obviously promotes efficient biodiesel production because of the crystal form transformation from lead sulfate particles in dust into active lead oxide, lead sulfide, and lead particles. It is found for the first time that lead oxide, lead sulfide and lead particles can resist saponification from fatty acids to catalyze raw renewable oils to biodiesel with catalytic activity order as follows: lead oxide > lead > lead sulfide > lead sulfate. Biodiesel production process is optimized according to an orthogonal design with biodiesel yield of 92 wt% obtained at AV of 9.6 mg KOH/g (82 wt% after 5 cycles). Biodiesel yield of 84 wt% is achieved at AV of 28.9 mg KOH/g with acidity of 0.18 mmol/g. Calcined blast furnace dust presents potential applications in the production of biodiesel from renewable oils with high AVs.
研究领域:
化学工程
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可再生能源
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催化材料
✓ 已验证
DOI
高影响因子
BIOCATALYSIS AND BIOTRANSFORMATION
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2021
·
IF 2.181
Weican Wang,Ling Li,Xiaoda Wang,Ting Qiu,Jianhao Yang,Changshen Ye
The enzyme-catalyzed transesterification reaction is an important route to realize the resolution of racemic optically active secondary alcohols. However, this route suffers from the high environment and engineering risks due to the usage of vinyl ester as acyl donor. In this work, an alternative acyl donor, ethyl butyrate, was used because it is more environment-friendly and catalyst-friendly. The kinetic studies on transesterification of 1-phenylethanol with ethyl butyrate catalyzed by immobilized-lipase Novozym™ 435 were carried out. The effects of agitation speed, reaction temperature, catalyst loading and initial molar ratio of reactants were investigated. The Ping-Pong-Bi-Bi and pseudo-homogeneous models were used to correlate the experimental data to estimate the kinetic parameters. The concentration-based Ping-Pong-Bi-Bi model was translated into its activity-based form to describe the non-ideality of the lipase-catalyzed reaction system. The activity-based Ping-Pong-Bi-Bi kinetic model performed best among all the models used.
研究领域:
生物化学
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酶工程
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产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Hao Zhang,Siyang Yu,Shixiong Cao,Xiaobo Liu,Jun Tang,Lingyu Zhu,Jianbing Ji,Jianli Wang
Pickering emulsion systems provide potential platforms for simultaneously intensifying and catalyzing transesterification between triglyceride and methanol under static conditions. However, realizing static transesterification with high biodiesel yield is still challenging due to low emulsion stability at the reaction temperature. Here, a series of magnetically recyclable Pickering interfacial catalysts (PICs) with similar surface affinities but different densities were constructed as stabilizers of a soybean oil/methanol emulsion. The variations in the emulsion volume fraction and droplet size were comparatively studied and analyzed from the viewpoint of droplet settling and catalyst particle shedding. It is found that, except for surface affinity, PIC density also plays a pivotal role in emulsion stability owing to the non-negligible effect of gravity on catalyst adsorption in triglyceride/methanol emulsion (especially at elevated temperature). By reducing the density, finely improving the lipophilicity, and optimizing the addition amount of PIC, the obtained soybean oil/methanol emulsion can remain stable for at least 12 h at 60 °C, enabling static transesterification with a high biodiesel yield of 95.6%. Moreover, the best performing PIC can be reused for at least 7 cycles. This efficient static transesterification system offers a green strategy for biodiesel production.
研究领域:
化学工程
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催化材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RENEWABLE ENERGY
·
2020
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IF 6.274
Tongxin Qu,Shengli Niu,Zhiqiang Gong,Kuihua Han,Yongzheng Wang,Chunmei Lu
CaO is efficient in catalyzing transesterification for biodiesel production , but its industrial application is inherently restricted by active sites leaching. To address this drawback, CaO is decorated into wollastonite to prepare the stable Ca/wollastonite catalyst. Microwave-assisted transesterification is used to produce biodiesel from palm oil, which effectively accelerates the reaction rate and improves the conversion efficiency. The Ca/wollastonite-0.8 catalyst with the mass ratio of CaO to wollastonite of 0.8 performs well with the fatty acid methyl ester (FAME) yield of 97.59%. Also, this catalyst is highly stable, where the FAME yield of 87.30% could be obtained for the fifth reused cycle. CaO is evenly dispersed on the wollastonite surface and the total basicity is high to 0.281 mmol g −1 . Meanwhile, transesterification parameters are optimized by response surface methodology with central composite design (RSM-CCD) and the maximum FAME yield of 98.46% is achieved at reaction temperature of 64.2 °C, molar ratio of methanol to palm oil of 15.54 and mass ratio of catalyst to palm oil of 9.21 wt % for 3 h. Besides, the mass ratio of catalyst to palm oil is the primary variable. Wollastonite is demonstrated to be feasible to enhance the stability of CaO in catalyzing transesterification.
研究领域:
化学工程
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可再生能源
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
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2018
·Vol. 25
·期 12
·6935-6945
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IF 3.809
Chen Huaxin,Yang Fahui,Du Jiehao,Xie Haibo,Zhang Lihua,Guo Yuanlong,Xu Qinqin,Zheng Qiang,Li Nanwen,Liu Yu
Abstract The transesterification reaction between cellulose and vinyl esters is regarded as a clean and facile strategy for the tunable synthesis of cellulose esters. In this study, a series of cellulose esters with degrees of substitution from 0.58 to 3.0 have been prepared successfully under mild conditions without adding any external catalysts when cellulose was dissolved in the 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)/DMSO/CO 2 solvent system and then followed by adding equimolar amounts of long chain fatty, aromatic, branched and steric vinyl esters. The optimization study of different reaction parameters like reaction time, temperature and amounts of substrates demonstrates that the reaction can proceed smoothly even at room temperature. This is evidenced by a cellulose benzoate with a DS of 2.6 obtained when the reaction is performed at 25 °C in 4 h. The as-prepared cellulose esters structure has been confirmed by 1 H NMR, 13 C NMR and FTIR, and material thermal properties were evaluated by DSC and TGA for an in-depth understanding the relationship between the cellulose esters structure and properties. It is believed that the DBU not only acts as a reagent for the CO 2 -derivative dissolution of cellulose in DMSO, but also acts as an in situ organocatalyst for the subsequent transesterification reaction. Graphical abstract Cellulose esters have been prepared successfully at low temperature using long chain fatty acids, aromatic, branched and steric vinyl esters as acyl donors in the DMSO/DBU/CO 2 solvents system, and the DBU not only acts as reagents for the CO 2 -derivative dissolution of cellulose in DMSO, acts as an organocatalyst for the subsequent derivatisation.
研究领域:
材料科学
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化学工程
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有机化学
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产品关联
DOI
高影响因子
FUEL
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2021
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IF 6.609
Su Zhang,Litao Wang,Jiandong Wang,Jie Yang,Lina Fu,Zihui Cai,Yujie Fu
A novel and cyclic in situ transesterification of yellow horn ( Xanthoceras sorbifolia Bunge.) seeds to biodiesel using the switchable solvent, N , N -dimethylcyclohexylamine (DMCHA) as both a reusable solvent and catalyst was proposed. An optimizing study for the reaction conditions has been performed through response surface methodology. The maximum yield of fatty acid methyl esters (FAMEs) achieved 96.07% under the best conditions of temperature 63.93 °C, 28.05 min, methanol amount of 10.41 mL/g (v/w of material) and DMCHA amount of 16.42 mL/g. Notably, The results of mechanism study combined with molecular dynamics and quantum chemistry theory showed that DMCHA is compatible with the triglycerides, and the effect of the hydrogen bonds, interaction energy, and radial distribution function on DMCHA performance were investigated for the first time. This new configuration of using switchable solvent for simultaneous extraction and reaction would be an appropriate, efficient and environment-friendly approach for simplify biodiesel production.
研究领域:
化学工程
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能源科学
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植物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Chao Chen,Lei Cai,Lei Zhang,Wenqian Fu,Yanping Hong,Xiu Gao,Yan Jiang,Liang Li,Xianzai Yan,Guoqiang Wu
Mesoporous NaBeta zeolite was synthesized successfully in the presence of a mesoscale copolymer (RCC) template, and a series of mesoporous NaBeta-supported molybdenum with varying Mo loadings ( x Mo/NaBeta) catalysts were prepared carefully for biodiesel production via the transesterification of rice bran oil. The resultant catalyst exhibits high activity and excellent stability in this transesterification reaction, attributing to the formation of highly dispersed Mo active species and the well interaction between the Mo oxide species and support. The physical properties of the as-produced biodiesel accorded with the current international biodiesel standards. Furthermore, the intrinsic kinetics of the transesterification of rice bran oil with methanol over 7Mo/NaBeta catalyst was also studied in the absence of mass transfer. The corresponding kinetic equation was established by correlating the data of initial rate and reactant concentration, and the apparent activation energy was calculated to be 59.05 kJ mol −1 .
研究领域:
化学工程
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可再生能源
·
催化材料
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2019
·
IF 1.918
Chenghuan Yang,Liang He,Qingqing Guan,Jiajing Chen,Rongrong Miao,Lei Tao,Ningmeng Hu,Bin Li
Enhancement of the transesterification efficiency of triglyceride has come under heated study in biodiesel-making industry. In this research, the NiMo/La-Al2O3 nanopowders have been prepared for producing biodiesel efficiently. The screening test showed that the NiMo/La-Al2O3 catalyst has the best catalytic activity for triglyceride transesterification. Besides, the process parameters including reaction temperature, time, oil-to-alcohol ratio and catalyst loading etc., also have been investigated for optimization of the transesterification process. The results showed that with 5 wt% of catalyst loading, and oil to methanol molar ratio of 1:9, the conversion yield of triglyceride could be up to 95.2% within 120 min at 160°C. The NiMo/La-Al2O3 catalyst has the outstanding recycle property, which proved that the prepared NiMo/La-Al2O3 powders can be suitable for biodiesels’ production.
研究领域:
化学工程
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催化
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可再生能源
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生物柴油生产
✓ 已验证
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2026
·
IF 2.1
Liu Chunxiao,Cai Baoli,Yin Wang,Huang Zhixian
In this study, Ethylene glycol monobutyl ether acetate (EBAC) was synthesized via the transesterification between ethylene glycol monobutyl ether (EB) and butyl acetate (BAC) with Amberlyst 15 resin adopted as the catalyst. The influences of ether-ester molar ratio (1:1–1:4), reaction temperature (333.15–373.15 K) and catalyst dosage (2–10 wt%) on the reaction were investigated through experiments. On the basis of kinetic experimental data, the pseudo-homogeneous (P–H) model and Langmuir–Hinshelwood-Hougen-Watson (LHHW) model were constructed and compared. The LHHW model delivered superior fitting performance, with the maximum root-mean-square deviation (RMSD) reaching 0.0118. Fixed-bed reactor simulation was carried out by means of COMSOL Multiphysics software, and the simulation outcomes were verified against experimental results. The average errors of molar fractions for EB and EBAC at the reactor outlet were 0.0331 and 0.0224, which verifies the reliability of the kinetic model. Meanwhile, combined with relevant experiments and characterization results, it is confirmed that the selected catalyst possesses excellent structural stability and recycling potential. On this foundation, a conceptual-design scheme for the continuous reaction-separation process was put forward to separate the azeotrope composed of BAC and n -butanol (BUOH) generated in the transesterification reaction. This research provides new insights and a theoretical foundation for the exploitation of transesterification-based processes for EBAC manufacture.
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Ling Tan,Yufei Huang,Wei Mao,Xiayi Hu,Yangqiang Huang,Hao Chen,Xiao Luo
Diphenyl carbonate (DPC) is a crucial organic chemical intermediate that is widely applied for the synthesis of polycarbonate. The process of transesterification of dimethyl carbonate (DMC) and phenol to produce DPC is promising and is in line with the requirements of green transitions and raw material sustainability. In this work, anatase-layered titanium dioxide (A-TiO2) was prepared and applied for the efficient transesterification of DMC and phenol to synthesize DPC with 10.5% phenol conversion and 87.9% DPC selectivity. The high activity and selectivity of transesterification over A-TiO2 were ascribed via characterizations to the tetracoordinate Ti species and Lewis acid–base sites on the catalyst surface. We further studied the deactivation mechanism of this kind of A-TiO2, and it was found that Ti leaching and the deposition of organic compounds onto the catalyst surface were the major reasons for deactivation during transesterification. This study provides some insights into the design of highly active and selective catalysts for transesterification reactions.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yi Guo,Rui Wang,Chang Shu,Hong Li,Xin Gao
Reactive distillation (RD) can be effectively used to improve the selectivity of the intermediate product for complex multi-reaction schemes, which involves using distillation to manipulate the column profiles in the RD column (RDC) to attribute the desired reaction and the manipulating reactions to facilitate separation. As the demand for ethyl methyl carbonate (EMC) has increased significantly due to its structural characteristics, the selective synthesis of EMC from the consecutive transesterification of dimethyl carbonate (DMC) and ethanol (EtOH) in the presence of azeotropes between reactants and products was studied as featured reaction schemes. The basic resin catalyst KC161 is utilized to build the kinetic reaction model and supplement the primary data for the process design. The pilot-scale RD experiments are explored to verify the feasibility and the reliability of the model. The impact of critical operation and structure parameters on the conversion and selectivity of the reaction and the azeotropes formed in the system were analyzed. A hybrid distillation process containing an RDC, pressure-swing distillation columns, and a regular distillation column, was designed and optimized based on minimized total annual cost (TAC) using a sequential iterative algorithm. 0. 9997 (mole purity) EMC and 0. 9999 (mole purity) diethyl carbonate (DEC) were obtained with EMC selectivity up to 0.863%.
研究领域:
化学工程
·
工艺化学
·
工业化学
✓ 已验证
产品关联
DOI
高影响因子
ChemPlusChem
·
2024
·
IF 3
Meng-Ge Wei,Hong-Ru Li,Liang-Nian He
Graphical A series of solid base KF/Mg-Fe bi-metal oxides were fabricated via supporting KF on Mg-Fe bi-metal oxides and calcination. When applied as catalyst to dimethyl carbonate (DMC) synthesis through transesterification of ethylene carbonate (EC) and methanol, this material can afford up to 88 % yield and 97 % selectivity toward DMC in the optimal conditions. It is worth noting that the catalyst can be easily separated by filtration and reused. A series of KF/Mg-Fe oxides were fabricated via the solid-state reaction between KF and Mg-Fe oxides. Especially, when 20 wt % KF was supported on the Mg-Fe bi-metal oxides and calcined at 400–600 °C, the solid material with more basic sites than the support itself was obtained. When applied as catalyst to dimethyl carbonate (DMC) synthesis through transesterification of ethylene carbonate (EC) and methanol, this material can afforded up to 88 % yield and 97 % selectivity toward DMC in 2 h under reflux conditions with the molar ratio of methanol to ethylene carbonate set at 8. It is worth noting that the catalyst was easily separated and reused, retaining at least 89 % catalytic activity during the first four recycles. Although an attenuated activity was still observed due to the inevitable filtration loss and dissolution, this solid base can still provide clues to the development recyclable catalyst in green synthesis of DMC.
研究领域:
化学工程
·
绿色化学
✓ 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）