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International Conference on Artificial Intelligence and Embedded Systems(ICAIES’2012);International Conference on Trends in Electrical,Electronics and Power Engineering(ICTEEP2012);International Conference on Thermal,Material and Mechanical Engineering(ICTMME’2012);International Conference on Advances in Biological and Medical Sciences(ICABMS’2012);International Conference on Chemical Processes and Environmental Issues(ICCEEI’2012);International Conference on Law,Humanities and Management(ICLHM’2012)

作者： Sirawat Satapimonphan Somchai Pengprecha Faculty of Science Chulalongkorn University Department of Chemistry Faculty of ScienceChulalongkorn University

Biodiesel is increased attention because it is produced from renewable resources. Nevertheless, the poor flow property of biodiesel at cold temperature is a major drawback that limits its use in low temperature due to crystallization of saturated fatty acid methyl ester. In this research, the white sesame seed oil （WSSO） was selected as source of biodiesel because of high levels of unsaturated fatty acid. Biodiesel of the WSSO was synthesized via transesterification reaction, by using optimal condition as follow: 12:1 molar ratio of methanol to oil and 1 wt% of NaOH as catalyst at 65 ℃ for 2 h. Moreover, cold flow property of biodiesel from the WSSO was improved by using methyl stearate （MS）, isopropyl stearate （IPS）, methyl oleate （MO） and isopropyl oleate （IPO） as pour point depressants （PPD） at various concentrations: 0, 1, 10 and 30 wt%. The results showed that isopropyl oleate （IPO） was the most effective, at which 30 wt% of IPO, the cloud point （CP） and the pour point （PP） of biodiesel from the WSSO were reduced from 1 ℃ to -6.6 ℃ and 0 ℃ to -8 ℃, respectively.

关键词： biodiesel white sesame seed oil cold flow property cloud point pour point depressants.

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Improving cold flow properties of palm fatty acid distillate biodiesel through vacuum distillation

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Journal of Bioresources and Bioproducts 2022年第1期7卷 43-51页

作者： Siew Ping Yeong Yen San Chan Ming Chiat Law Jordy Kim Ung Ling Department of Mechanical Engineering Faculty of Engineering and ScienceCurtin University MalaysiaCDT 25098009 MiriSarawakMalaysia Department of Chemical and Energy Engineering Faculty of Engineering and ScienceCurtin University MalaysiaCDT 25098009MiriSarawakMalaysia

Palm fatty acid distillate(PFAD),a by-product of refining process of crude palm oil can be used as a potential feedstock for biodiesel ***,the application of palm oil-based biodiesel is often hinder by its poor cold flow properties(CFP).Biodiesel fuel with poor CFP may crystallize and result in clogging of fuel lines,filters and injectors that cause engine operability *** that,a vacuum distillation method was designed and its feasibility and efficiency in improving the CFP was examined.A total of 13.60wt%of total saturated fatty acid methyl esters were successfully removed from the PFAD biodiesel,resulting in the improvement of the cloud point(CP),cold filter plugging point(CFPP)and pour point(PP)of PFAD biodiesel from 20℃,19℃,and 15℃to 13℃,11℃,and 9℃,*** is remarkable that the improved CFPP satisfied the requirements for grade C summer biodiesel for temperate climates in EN 14212 ***,Sarin(U FAME)empirical correlation was evaluated and it was found to have a good prediction of CFP for PFAD biodiesel,with lower than 2℃deviation.

关键词： Biodiesel cold flow property Methyl palmitate Palm fatty acid distillate(PFAD) Vacuum distillation

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Low-temperature Properties of Biodiesel:Rheological Behavior and Crystallization Morphology

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China Petroleum Processing & Petrochemical Technology 2010年第1期12卷 29-33页

作者： Chen Boshui Sun Yuqiu Fang Jianhua Wang Jiu Wu Jiang (Department of Petrochemistry,Logistical Engineering University,Chongqing 401311,China) Department of Petrochemistry Logistical Engineering University University Town Shapingba District Chongqing 401311 China

A soybean oil derived biodiesel was prepared and blended with a conventional No. 0 petrodiesel. The pour points （PP） and the cold filter plugging points （CFPP） of biodiesel blends were evaluated on a low-temperature flow tester. Dynamic viscosities of the blends at different temperatures and different shear rates were measured on a rotary rheometer. The crystal morphologies of biodiesel blends at low temperatures were analyzed using a polarizing microscope. The results indicated that blended fuels demonstrated slight decrease in PPs and CFPPs as compared with those of neat soybean oil derived biodiesel and pure petrodiesel. Below the temperatures of PPs or CFPPs, the dynamic viscosity of biodiesel blends dramatically increased with a decreasing temperature, but decreased with an increasing shear rate, so that biodiesel blends exhibited non-Newtonian behavior. At temperatures higher than PPs or CFPPs, a linear relationship appeared between the dynamic viscosity and shear rate and biodiesel blends became Newtonian fluids. At low temperatures, wax crystals of biodiesel blends grew and agglomerated rapidly. Loss of fluidity for biodiesel blends at low temperatures could therefore be attributed on one hand to the sharp increase of viscosity and on the other hand to the rapid growth and agglomeration of wax crystals.

关键词： biodiesel cold flow property viscosity rheology crystallization

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