FUEL
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2021
·
IF 6.609
Feihong Zhang,Jun Li,Shuping Yang,Yanlan Bi
Effect of six antioxidants (butylated hydroxytoluene, butyl hydroxyanisole, di- tert -butylhydroquinone, tert -butyl hydroquinone, propyl gallate, and pyrogallic acid) on crystallization properties of biodiesel was systematically investigated. Results showed that all the six antioxidants effectively inhibited biodiesel crystallization at low temperatures as reflected by the decrease of cold filter plugging point by 1 ~ 3℃, solid fat content by 0.01 ~ 2.30%, crystallization rate from 10 -4 to 10 -5 ~ 10 -6 k/min, crystal size from 214 × 14 ~ 357 × 43 to 71 × 14 ~ 286 × 29 (length × width, μm × μm), the absolute values of crystallization enthalpy changes by 1.5 ~ 5.5 J/g. The minimum concentrations of antioxidants for biodiesel to reach the induction period (8 h) regulated by the European Union standard were 500 mg/kg for TBHQ, PG, and PY, 1000 mg/kg for BHA and DBHQ, and 2000 mg/kg for BHT, respectively. Antioxidants were inserted between initial crystal nucleuses through hydrogen bonds. The large steric hindrance of antioxidants inhibited the clustering of initial crystal nucleuses, thus inhibiting the growth of methyl ester crystals. Biodiesel with the six antioxidants all had the same crystalline form (two-dimensional flake crystals). The weaker inhibitory effect of BHA than the other five antioxidants which didn’t present significant difference in inhibiting biodiesel crystallization was because the methoxy group of BHA cannot form a hydrogen bond well with the carbonyl group of methyl ester molecule.
研究领域:
能源生物学
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生物化学
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DOI
高影响因子
FUEL
·
2018
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IF 4.908
Jianguang Qi,Yufeng Hu,Jiangge Niu,Weiting Ma,Siqi Jiang,Yichuang Wang,Xianming Zhang,Yuehui Jiang
Polyoxymethylene dimethyl ethers (PODE n ) is an emerging biofuel that has a great potential to become one of the competitive alternative fuels for diesel engine. In the present study, systematic studies were made to evaluate the influences of PODE n on the physical fuel properties that are routinely used to define the quality of diesel fuels. Such fuel properties were measured for the three (diesel + PODE n ) mixtures, diesels, and PODE n . The measured properties included cetane number , lubricity, density, viscosity, solidifying point, cold filter plugging point, flash point, and heat capacity. Comparisons of measured properties of the mixtures and their individual components were made to achieve the following purposes: First, to reveal the changes in the properties of diesels upon the addition of PODE n and in the properties of the (diesel + PODE n ) mixtures as the weight percent of PODE n is increased; Second, to see whether or not the addition of PODE n worsens the properties of diesels, in particular, whether or not the measured values of the (diesel + PODE n ) mixtures exceed the standard values set by the Beijing-VI. Novel theoretical equations were developed to quantitatively predict the density, viscosity, and heat capacity of the (diesel + PODE n ) mixtures in terms of the corresponding properties of the diesel and PODE n . Comparisons were made between measured and predicted properties and the agreements are excellent.
研究领域:
能源化学
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燃料工程
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环境科学
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可再生能源
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燃烧学
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生物燃料
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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
FUEL
·
2025
·
IF 7.5
Ning Bai,Zihao Ni,Fashe Li,Huicong Zhang,Hua Wang,Jiahe Zhang
This study developed a multifunctional additive through the ternary copolymerization of stearyl methacrylate, oleic acid, and itaconic anhydride, grafted with antioxidant functional groups butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), and 3,5-di- tert -butyl-4-hydroxyphenylpropionic acid (DTBHA). Experimental results demonstrated that the POL-BHA (3:1:1) additive at 500 ppm exhibited the optimal pour point depression effect, reducing the cold filter plugging point (CFPP) of waste cooking oil biodiesel by 7.5 °C. At 500 ppm, POL-BHA (1:1:1) provided corrosion protection comparable to the monomeric BHA additive (copper sheet corrosion rating of Class 1b). Simultaneously, the additive significantly enhanced oxidative stability. At 2500 ppm, POL-BHA (1:1:1) extended the biodiesel oxidation induction period to 12.55 h. Using techniques including polarized optical microscopy, differential scanning calorimetry, and molecular dynamics simulations, this study revealed the pour point depression mechanism of the additive. The results indicate that the mechanism of action of this additive may involve selective adsorption on specific crystal planes, which inhibits unidirectional growth and promotes the formation of feather-like dendritic structures. In terms of antioxidant mechanisms, additives may achieve enhanced oxidative stability by relying on metal ion chelation; while in corrosion inhibition mechanisms, It is speculated that the mechanism reduces corrosivity by forming a dense molecular film on the metal surface. This work provides a comprehensive strategy for designing integrated additives, offering significant advancements in biodiesel quality enhancement and practical application.
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DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
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2024
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IF 3.7
Junzhang Chang,Jingwen Yang,Ben Xing,Xueqin Hu,Changchun Xu,Hongbin Zhang
Waste frying oil is a highly promising feedstock for biodiesel production due to its lower cost compared to refined vegetable oils. In this study, biodiesel was prepared by transesterification of mixed waste frying oil with dimethyl carbonate, utilizing immobilized recombinant lipase in tert -butanol as the medium. The activation energy ( E a ) and pre-exponential factor (k 0 ) were determined to be 73.8 kJ/mol and 1.62×10 6 , respectively. Under optimal reaction conditions, the biodiesel yield can reach 88.5%. Subsequently, cottonseed oil was introduced into the feedstock to enhance the crystallization temperature of the product, which enables biodiesel production to meet the fuel property standards. The cold filter plugging point of biodiesel was reduced to 4.3 ℃. Ultimately, blending biodiesel with diesel significantly reduces smoke emissions from diesel engines, with the B80 blend demonstrating superior effectiveness. This study presents an efficient and cost-effective method for biodiesel production.
研究领域:
可再生能源
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化学工程
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环境科学
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机械工程
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 46
·期 4
·1770-1778
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IF 3.591
Xia Jiang,Feng Long,Qiaolong Zhai,Jiaping Zhao,Peng Liu,Junming Xu
Soap stocks are by-products obtained during the refining process of vegetable oil, and are mainly feedstocks to produce acidified oil. In this work, an efficient process was developed to convert soap stock into a high-quality biofuel with low impurity content. A combination of acidification and catalytic cracking reactions employed as pretreatment was investigated to decrease the impurity content in the soap stock feedstock for obtaining a value-added biofuel. A high olefin content (approximately 47%) pyrolytic oil was obtained during the pretreatment. For further improvement of the cold flow properties, hydro-isomerization of pyrolytic oil for the formation of iso-alkanes over the Ce–Pt/SAPO-11and Ce–Pt/ZSM-5 catalysts was then carried out. The isomerization reaction temperature could be decreased to 320 °C because of the approximately 47% olefin content. The cold filter plugging point (CFPP) of the resulting product could be obtained at −11 °C, and the sulfur content could be decreased to lower than 10 ppm, which could meet the EN and ASTM specifications.
研究领域:
化学工程
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生物能源
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催化
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可再生能源
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产品关联
DOI
高影响因子
ENERGY & FUELS
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2020
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IF 3.421
Suya Yin,Taishun Yang,Yuan Xue,Maiying Xie,Fengfei Chen,Hualin Lin,Bin Dai,Feng Gao,Sheng Han
High-efficiency pour point depressants (PPDs) for diesel fuel were obtained using a series of tetradecyl methacrylate-N-α-methacrylamide copolymers (C14MC-NMLR) with different molar ratios synthesized through radical polymerization of tetradecyl methacrylate (C14MC) and various forms of N-α-methacrylamide (NMLR, R = -phenyl, -naphthyl, -cyclohexyl, -14a, -16a, -18a). The copolymers were characterized by Fourier transform infrared spectroscopy, 1H nuclear magnetic resonance, and thermogravimetric analysis. Results showed that diesel treated with C14MC-NML-phenyl (9:1) and C14MC-NML-14a (6:1) presented better cold flow properties at 2000 ppm, and the reductions in cold filter-plug point (ΔCFPP) and solid point (ΔSP) were (23 and 10 °C) and (22 and 11 °C) at 2000 ppm, respectively. The depressive effects further improved after compounding. When they were combined at a 1:4 mass ratio, PPDC-6 presented the best depressive effects, and the ΔCFPP and ΔSP reached 25 and 11 °C at 1000 ppm dosage and 28 and 15 °C at 2000 ppm dosage, respectively. Additionally, the crystallization behavior and crystal morphology of each treated diesel were explored.
研究领域:
化学工程
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材料科学
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高分子化学
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燃料技术
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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）