The Experts below are selected from a list of 54 Experts worldwide ranked by ideXlab platform
Lawrence L Tavlarides - One of the best experts on this subject based on the ideXlab platform.
-
thermal decomposition of ethanol based biodiesel mechanism kinetics and effect on viscosity and Cold Flow Property
Fuel, 2016Co-Authors: Jiuxu Liu, Yujie Shen, Yue Nan, Lawrence L TavlaridesAbstract:Abstract Thermal decomposition of the ethanol-based biodiesel (FAEEs) was evaluated in batch reactors by thermal exposure at 250–425 °C for durations from 3 to 63 min, with and without the presence of ethanol. The results of GC analysis show that FAEEs were relatively stable at 250 and 275 °C, and stability reduced as temperature and heating time increased. Major decomposition reactions consisted of isomerization, polymerization, and pyrolysis reactions to form isomers, dimers/polymers, smaller chain FAEEs, hydrocarbons, and carboxylic acids the latter of which are not generated in the decomposition of methanol-based biodiesel (FAMEs). This suggests that when applying the sub/supercritical ethanol technology to produce FAEEs, the reaction temperatures must be modest to avoid generating acids which increases the acid value of the final product. A three-lump model was used to predict concentrations of compounds in the FAEEs stressed at 250–325 °C. The decomposition degree of the FAEEs biodiesel was simulated by using first order one-step reaction models (reversible and irreversible), and results show that the reversible model performed better than the irreversible model except for data of 425 °C. The data show that FAEEs are less stable and decompose more completely than FAMEs. The presence of ethanol was shown to reduce the decomposition. Dynamic viscosity was measured, and differential scanning calorimetry (DSC) was used to determine the crystallization onset temperatures to represent Cold Flow properties. The values are significantly influenced by the polymerization and pyrolysis reactions.
-
effect of thermal decomposition on biodiesel viscosity and Cold Flow Property
Fuel, 2014Co-Authors: Ronghong Lin, Yiying Zhu, Lawrence L TavlaridesAbstract:Abstract Thermal stressing experiments were performed in batch reactors at 250–425 °C for 3–63 min to evaluate the influence of thermal decomposition on biodiesel viscosity and Cold Flow properties. Dynamic viscosity was measured by a micro viscometer, and Cold Flow properties were characterized by differential scanning calorimetry (DSC). The crystallization onset temperature determined by DSC correlates with Cold Flow properties. Results showed that the cis – trans isomerization reactions had a minimal effect on both viscosity and Cold Flow properties of biodiesel, but polymerization and pyrolysis reactions had significant influence on both properties. Polymerization reactions resulted in increases in both viscosity and the crystallization onset temperature, while pyrolysis reactions showed the opposite effect. The current study suggests that polymerization reactions should be avoided or minimized during high-temperature non-catalytic homogeneous transesterification reactions for biodiesel production.
Ronghong Lin - One of the best experts on this subject based on the ideXlab platform.
-
effect of thermal decomposition on biodiesel viscosity and Cold Flow Property
Fuel, 2014Co-Authors: Ronghong Lin, Yiying Zhu, Lawrence L TavlaridesAbstract:Abstract Thermal stressing experiments were performed in batch reactors at 250–425 °C for 3–63 min to evaluate the influence of thermal decomposition on biodiesel viscosity and Cold Flow properties. Dynamic viscosity was measured by a micro viscometer, and Cold Flow properties were characterized by differential scanning calorimetry (DSC). The crystallization onset temperature determined by DSC correlates with Cold Flow properties. Results showed that the cis – trans isomerization reactions had a minimal effect on both viscosity and Cold Flow properties of biodiesel, but polymerization and pyrolysis reactions had significant influence on both properties. Polymerization reactions resulted in increases in both viscosity and the crystallization onset temperature, while pyrolysis reactions showed the opposite effect. The current study suggests that polymerization reactions should be avoided or minimized during high-temperature non-catalytic homogeneous transesterification reactions for biodiesel production.
Sheng Han - One of the best experts on this subject based on the ideXlab platform.
-
influence of tetradecyl methacrylate n α methacrylamide copolymers as pour pointdepressants on the Cold Flow Property of diesel fuel
Energy & Fuels, 2020Co-Authors: Suya Yin, Taishun Yang, Yuan Xue, Maiying Xie, Fengfei Chen, Hualin Lin, Bin Dai, Feng Gao, Sheng HanAbstract: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.
Jiuxu Liu - One of the best experts on this subject based on the ideXlab platform.
-
thermal decomposition of ethanol based biodiesel mechanism kinetics and effect on viscosity and Cold Flow Property
Fuel, 2016Co-Authors: Jiuxu Liu, Yujie Shen, Yue Nan, Lawrence L TavlaridesAbstract:Abstract Thermal decomposition of the ethanol-based biodiesel (FAEEs) was evaluated in batch reactors by thermal exposure at 250–425 °C for durations from 3 to 63 min, with and without the presence of ethanol. The results of GC analysis show that FAEEs were relatively stable at 250 and 275 °C, and stability reduced as temperature and heating time increased. Major decomposition reactions consisted of isomerization, polymerization, and pyrolysis reactions to form isomers, dimers/polymers, smaller chain FAEEs, hydrocarbons, and carboxylic acids the latter of which are not generated in the decomposition of methanol-based biodiesel (FAMEs). This suggests that when applying the sub/supercritical ethanol technology to produce FAEEs, the reaction temperatures must be modest to avoid generating acids which increases the acid value of the final product. A three-lump model was used to predict concentrations of compounds in the FAEEs stressed at 250–325 °C. The decomposition degree of the FAEEs biodiesel was simulated by using first order one-step reaction models (reversible and irreversible), and results show that the reversible model performed better than the irreversible model except for data of 425 °C. The data show that FAEEs are less stable and decompose more completely than FAMEs. The presence of ethanol was shown to reduce the decomposition. Dynamic viscosity was measured, and differential scanning calorimetry (DSC) was used to determine the crystallization onset temperatures to represent Cold Flow properties. The values are significantly influenced by the polymerization and pyrolysis reactions.
Yiying Zhu - One of the best experts on this subject based on the ideXlab platform.
-
effect of thermal decomposition on biodiesel viscosity and Cold Flow Property
Fuel, 2014Co-Authors: Ronghong Lin, Yiying Zhu, Lawrence L TavlaridesAbstract:Abstract Thermal stressing experiments were performed in batch reactors at 250–425 °C for 3–63 min to evaluate the influence of thermal decomposition on biodiesel viscosity and Cold Flow properties. Dynamic viscosity was measured by a micro viscometer, and Cold Flow properties were characterized by differential scanning calorimetry (DSC). The crystallization onset temperature determined by DSC correlates with Cold Flow properties. Results showed that the cis – trans isomerization reactions had a minimal effect on both viscosity and Cold Flow properties of biodiesel, but polymerization and pyrolysis reactions had significant influence on both properties. Polymerization reactions resulted in increases in both viscosity and the crystallization onset temperature, while pyrolysis reactions showed the opposite effect. The current study suggests that polymerization reactions should be avoided or minimized during high-temperature non-catalytic homogeneous transesterification reactions for biodiesel production.