KOREAN JOURNAL OF CHEMICAL ENGINEERING
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2016
·Vol. 33
·期 5
·1692-1697
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IF 1.408
Yue Hongya,Liu Zhigang
Density and surface tension have been measured for mixtures of biodiesel+ n -butanol, biodiesel+diesel, and diesel+ n -butanol over the entire concentration range at 283.15 K and 293.15 K and atmospheric pressure, with the combined expanded uncertainties of 1.32 kg·m −3 and 1%, receptively. Densities were determined by a single-sinker densimeter; surface tensions were measured using the surface laser light scattering method. The experimental data showed that densities and surface tensions decreased as temperature increased. The excess surface tensions and excess densities were all negative, and further fitted to the Redlich-Kister equation.
研究领域:
物理化学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
·
IF 2.694
Jing Fan,Peng Liu,Qinglong Meng,Chang Gao,Fenhong Song
Recently, biodiesel has received tremendous attention from a lot of scientists as a biodegradable, renewable, and high-potential fuel, which could be used directly or blended with diesel in internal combustion engines. The adequate thermophysics properties of fuel are required to model the process of fuel spray, atomization, and combustion accurately. In this work, five fuel blends containing methyl myristate and n-alkane (N-decane, N-undecane, N-dodecane, N-tridecane, and N-tetradecane) were prepared, and an important transport property—liquid thermal conductivity—was measured through an experimental system constructed based on transient hot-wire theory. The measurement was conducted at temperatures ranging from 292 to 362 K under a pressure of 0.1 MPa with the weight fraction of methyl myristate being nearly 0.2000, 0.4000, 0.6000, and 0.8000 (by weight) in the binary mixtures. Furthermore, the relationship between the experiment results and temperature and mass fraction of methyl myristate was correlated as a polynomial function. The uncertainty of the experiment system is smaller than ±2.0%.
研究领域:
能源科学
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热物理性质研究
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产品关联
DOI
高影响因子
AMB Express
·
2024
·Vol. 14
·期 1
·1-10
·
IF 3.5
Wang Laiyou,Liu Bingbing,Meng Qingshan,Yang Chunchun,Hu Yiyi,Wang Chunyan,Wu Pengyu,Ruan Chen,Li Wenhuan,Cheng Shuang,Guo Shuxian
The unsustainable and widespread utilization of fossil fuels continues to drive the rapid depletion of global supplies. Biodiesel has emerged as one of the most promising alternatives to conventional diesel, leading to growing research interest in its production. Microbes can facilitate the de novo synthesis of a type of biodiesel in the form of fatty acid methyl esters (FAMEs). In this study, Saccharomyces cerevisiae metabolic activity was engineered to facilitate enhanced FAME production. Initially, free fatty acid concentrations were increased by deleting two acetyl-CoA synthetase genes (FAA1, FAA4) and an acyl-CoA oxidase gene (POX1). Intracellular S-adenosylmethionine (SAM) levels were then enhanced via the deletion of an adenosine kinase gene (ADO1) and the overexpression of a SAM synthetase gene (SAM2). Lastly, the S. cerevisiae strain overproducing free fatty acids and SAM were manipulated to express a plasmid encoding the Drosophila melanogaster Juvenile Hormone Acid O-Methyltransferase (DmJHAMT). Using this combination of engineering approaches, a FAME concentration of 5.79 ± 0.56 mg/L was achieved using these cells in the context of shaking flask fermentation. To the best of our knowledge, this is the first detailed study of FAME production in S. cerevisiae. These results will provide a valuable basis for future efforts to engineer S. cerevisiae strains for highly efficient production of biodiesel.
研究领域:
生物技术
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代谢工程
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可再生能源
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DOI
PubMed
高影响因子
FUEL
·
2016
·
IF 3.611
Yuan Xue,Weina Zhao,Peng Ma,Zhicheng Zhao,Guangwen Xu,Chao Yang,Hongyan Chen,Hualin Lin,Sheng Han
This study aims to reduce the cloud point (CP), cold filter plugging point (CFPP) and pour point (PP) of biodiesel from waste cooking oil (BWCO) by ternary complementary blending 0# petro-diesel (PD) and diesel from direct coal liquefaction (DDCL) with BWCO. The cold flow properties of BWCO–PD–DDCL ternary blends, and BWCO–PD, BWCO–DDCL binary blends were comparative evaluated. Ternary phase diagrams were used to present the blending effect on the CP, CFPP, and PP of biodiesel. Results indicated that PD and DDCL exhibited positive synergistic effects on improving the cold flow properties of ternary blends. Ternary blends containing 20% BWCO and 10–40% PD have lower CFPP with respect to BWCO–PD and BWCO–DDCL blends in volume ratio of 20:80. When blends contain up to 60% DDCL and less than 15% BWCO, such fuels could be used in extremely low temperature areas. Other fuel properties were also determined and compared with the ASTM D7467. In addition, to explore the performance mechanism, differential scanning calorimetry and polarizing optical microscopy were used to observe the crystallization behavior and crystal morphology of blends fuel.
研究领域:
能源工程
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化学工程
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
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2024
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IF 5.6
Ziye Zhang,Peng Zhang,Hao Chen,Han Wu,Limin Geng,Wenbo Zhang,Zhanming Chen,Donghui Qi,Jianming Cao,Biao Wang
The rapid increase in automobile ownership has brought about an increase in pollutant emissions, the blending of alcohols can effectively reduce conventional pollutant emissions from diesel engines. However, alcohols have poor inter-solubility with diesel fuel. This study investigates the effects of blending different alcohols on the spray and combustion characteristics of diesel, with biodiesel as the cosolvent. The results show that among the three alcohols, blending methanol has the best improvement in the gas-liquid phase spray characteristics, followed by ethanol and propanol. The GL-SCA and GL-SPA of the methanol blends are 8.2 % and 2.3 % larger than those of the ethanol blends, and 19 % and 11.9 % larger than those of the propanol blends, respectively. Among the four fuels, fuel blended with methanol emits the least normalized sum KL, 45 % less than that of diesel, 23.8 % less than that of ethanol blended fuel, and 35.3 % less than that of propanol blended fuel.
研究领域:
能源与燃料
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光学研究
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发动机排放控制
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产品关联
DOI
高影响因子
PROCESS BIOCHEMISTRY
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2024
·
IF 3.7
Hongbo Suo,Xinzheng Liu,Shu Chen,Qi Li,Xiangnan Liu,Lili Xu
Biodiesel is more environmentally friendly compared to traditional petroleum diesel. The method of producing biodiesel catalyzed by lipases, as a green chemistry technology, can further reduce its negative impact on the environment. In this work, lipase immobilized on magnetic cellulose was embedded in Cu(PABA), and then the biocomposite (MCL@Cu(PABA)) was used for biodiesel production. The good biocompatibility and flexible skeleton structure of cellulose can buffer the compression effect on enzyme molecules during the formation of Metal-Organic Frameworks (MOFs), and the MOFs protective layer can reduce the damage caused by denaturants to enzyme molecules. The biocatalyst showed enhanced activity and stability with a lower deactivation constant ( K d ). Under the optimized reaction conditions, the biodiesel yield can reach 78.4 %. After reused for 7 times, the biocatalyst can still achieve a biodiesel yield of 58.8 %. Moreover, after stored for 30 days, the biodiesel yield can still reach 70.3 %. For all experimental yields, the standard deviation (SD) ranged from 2.4 % to 4.5 %. Secondary structure analysis showed that the rigid structure and active conformation of lipase was enhanced after Cu(PABA) encapsulation.
研究领域:
生物化学
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环境科学
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产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Li Zhou,Fashe Li,Wenchao Wang,Huicong Zhang,Yaozong Duan,Hua Wang
Phospholipids, as key trace constituents of biodiesel, can have complex effects on the performance of biodiesel. Exploring the mechanism of their influence on the pyrolysis and oxidation characteristics of biodiesel is crucial for controlling the generation and emission of pollutants. To this end, this study employed TG-FTIR-MS experimental technology and the ReaxFF-MD simulation method to investigate the effects of phosphatidylethanolamine (PE) on the activation energy ( E a ), gaseous product generation, and mechanism of Jatropha biodiesel pyrolysis and oxidation reactions. The results indicated that the addition of 400 ppm PE can reduce the pyrolysis E a of Jatropha biodiesel from 87.25 kJ/mol to 80.67 kJ/mol, consistent with simulated E a of 93.35 kJ/mol and 81.81 kJ/mol, respectively. This notably promoted the initial oxidation stage of the Jatropha biodiesel reaction, facilitating the generation of oxidation products such as CO and C 2 H 4 . In the pyrolysis reaction, PE promoted C 2 H 4 formation, primarily through reactions involving hydrocarbon small free radicals. In the oxidation reaction, the addition of PE increased the number and variety of active free radicals in the system, with the formation reactions of H 2 O and CH 2 O involving phosphorus-containing oxygen groups. Furthermore, a small amount of nitrogenous free radicals participates in the formation reactions of C 2 H 4 and CO.
研究领域:
能源科学
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化学工程
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环境科学
✓ 已验证
DOI
高影响因子
Case Studies in Thermal Engineering
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2021
·
IF 4.724
Jing Fan,Han Mu,Chang Gao,Fenhong Song
Recently, biodiesel is considered as a biodegradable, renewable and high-potential fuel which could be used directly in tradition internal combustion engines. Fuel’ transport properties in high pressure are required to model the process of fuel spray, atomization and combustion accurately. This work, three ethyl esters’ liquid thermal conductivity (biodiesel compounds) in the liquid phase was measured by an experiment system which is established based on a transient hot-wire method with a bare platinum hot wire. The measurements were conducted at the temperatures ranging from 292 K to 372 K and pressure up to 15 MPa. The combined expanded uncertainty of the measurement was estimated to be ±2.0% (in the 0.95 confidence level). For interpolation, the relationship between measured results with temperature and pressure were correlated as a polynomial function, and the maximum deviation of correlations were less than 0.30%.
研究领域:
能源科学
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物理化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2021
·
IF 2.826
Zhenzhen Yu,Kangle Ding,Chao Han,Yi Wu,Mei Zou,Yan Liu,Fujia Guan
A natural mud shale (MS) from Yichang Area, China was for the first time experimentally examined for its potential application to oily effluents treatment. The mineralogical compositions, surface structures and pore size distribution of the prepared MS particles were characterised using various advanced analytical technologies, respectively. The performance of the MS particles during the model diesel oil wastewater treatment was examined based on the designed adsorption experiments. Isothermal and kinetic features were investigated according to a variety of adsorption models. The results showed that some pores, cavities and fractures were distributed on the surface of MS particles. The efficiency of MS particles for removing diesel oil from the model oily effluent was associated closely with experimental conditions including the mass of MS particles, initial diesel levels, residence time and pH values. Equilibrium adsorption isotherms conformed to Langmuir model, indicating that the adsorption of diesel oil onto MS particles tended to monolayer adsorption. Kinetics of adsorption of diesel oil on MS complied with the pseudo-second-order model. This suggested that the whole oil removal rate was mainly controlled by chemisorption. Results of our study indicates potential utilisation of unmodified MS particles as an abundant and inexpensive adsorbent for low-concentration diesel oil wastewater.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Yi-Tong Wang,Di Gao,Ya-Nan Zeng,Jun-Guo Li,Ai-Min Ji,Tian-Ji Liu,Shuang Cai,Wen-Jie Cong,Fu-Ping Wang,Qing Yu,Xiao-Man Wang,Zhen Fang
Solid catalyst (Na 2 CO 3 @EFD) was prepared by wet impregnation of electric furnace dust (EFD) in aqueous Na 2 CO 3 solution. It had high basicity and acidity of 0.34 and 0.16 mmol/g for biodiesel production. High biodiesel yield of 99.8 wt% from soybean oil was obtained under the optimized reaction conditions (by Central Composite Design) of 71 °C in 111.36 min with 5.4 wt% catalyst and methanol/oil molar ratio of 11.8/1. After 11 cycles, biodiesel yield still maintained at 90.8 wt% with catalyst recovery rate >90 wt% by magnetic separation of catalyst EFD powders (containing Fe 3 O 4 with magnetism of 59.1 Am 2 /kg). Pure Na 2 CO 3 particles presented poorer recyclability with lower biodiesel yield of 89.5 wt% even at the eighth cycle by centrifugal separation . Na 2 CO 3 @EFD catalyst had high activity and recyclability because: (i) EFD as support hosted nanoparticles of Na 2 CO 3 (30.3 nm) as main base site for transesterification ; (ii) porous EFD support provided acidic sites from metal oxides (e.g., ZnO and Al 2 O 3 ) for esterification; (iii) EFD adsorbed active components into its micropores to maintain high recyclability; and (iv) EFD magnetism from magnetic Fe 3 O 4 kept high efficient magnetic separation. Total metals in the blended biodiesel met the National Standard of China and heavy metals were lower than typical petrochemical diesel . The study gave a practical use of industrial solid waste for the green production of biodiesel.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Yimao Shen,Zhi Li,Jingtao Hu,Yue Zhang,Tianduo Li,Guangjin Chen
Gas hydrate technology is a new gas storage method developed in recent years and has great application potential. Due to the slow formation kinetics of hydrate and the low actual gas storage density, it is a promising method to prepare the fixed bed filled with wet porous materials to inducing adsorption-hydration coupling effect, so as to improve the gas storage efficiency. In this study, various additives including THF, TBAB and diesel oil were added to the water-bearing activated carbon fixed bed to improve its gas storage capacity. Our experimental results show that the addition of THF or TBAB can significantly promote the gas storage performance of the bed. At the optimum concentration of THF (7.5 wt%), the gas storage density of bed (S b ) and gas storage capacity of hydrate (S w ) were 128.66 V/V b and 194.26 V/V w , which are 2.89 times and 3.07 times higher than those of wet activated carbon fixed bed without additives, respectively. When 5 wt% TBAB was added, the S b and S w were increased by 1.86 times and 1.87 times, respectively. Moreover, using diesel to establish gas channels in the fixed bed to improve the gas mass transfer between the bulk gas phase and the fixed bed can also significantly improve the gas storage performance of the bed. When the oil-carbon ratio (R o ) is 0.5, the S b and S w are 97.97 V/V b and 172.77 V/V w , respectively. However, further increasing the amount of diesel oil will not significantly improve the gas storage density of the bed due to the volume increase of the bed caused by the addition of diesel. When both diesel oil and THF are added to the water-containing fixed bed, the effect will be not significantly better than that of the bed with diesel oil or THF alone because the two accelerators compete with each other. Finally, the gas release and decomposition speed of the water-bearing fixed bed with / without 7.5 wt%THF are investigated. The results show that the final gas recovery of the bed with 7.5 wt% THF could reach 95.01 %, indicating a good application prospect.
研究领域:
化学工程
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能源技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING & TECHNOLOGY
·
2019
·Vol. 43
·期 3
·403-411
·
IF 2.418
Huan Li,Tian Ma,Zhensheng Shen,An Li,Jie Yang,Dong Xiang,Jiuyi Liu,Shuguang Deng,Yingqiang Sun
1-Butyl-3-methylimidazolium hydrogen sulfate ([Bmim][HSO 4 ]) is utilized to catalyze transesterification of camelina oil with methanol. The major compositions of camelina biodiesel are saturated fatty acid esters (C16:0, C18:0), monounsaturated, and polyunsaturated fatty acid esters (C18:2, C18:3). The effects of reaction temperature, reaction time, M methanol : M Camelina oil , and M [Bmim][HSO4] : M Camelina oil on biodiesel production are investigated in detail, and a general mathematical model is developed to well predict the biodiesel yield. Also, [Bmim][HSO 4 ] is thermally stable to recycle for four times with a high biodiesel yield. The fuel properties of camelina biodiesel are all comparable to the American Society for Testing Materials (ASTM) standards.
研究领域:
能源科学
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化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）