The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Shiro Saka - One of the best experts on this subject based on the ideXlab platform.
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renewable diesel production from Rapeseed Oil with hydrothermal hydrogenation and subsequent decarboxylation
Fuel, 2016Co-Authors: Yuitsu Sugami, Eiji Minami, Shiro SakaAbstract:Abstract Hydrocarbon (renewable diesel) production from Rapeseed Oil was studied with hydrothermal hydrogenation and subsequent decarboxylation in a batch-type reaction vessel. An appropriate reaction condition for hydrothermal hydrogenation was found to be 270 °C/5 MPa (H 2 pressure) with water and Pd/C catalyst for 60 min, under which triglycerides were simultaneously hydrolyzed and hydrogenated into saturated fatty acids in a yield of 98.4 mol%. The obtained saturated fatty acids were then decarboxylated to hydrocarbons under the condition of 300 °C/1 MPa (H 2 pressure) with Pd/C for 120 min in a yield of 91.5 mol% on Rapeseed Oil. In addition, the composition of the obtained hydrocarbons corresponded nearly to that of the fatty acid in Rapeseed Oil. Such a result indicates that the composition of hydrocarbons produced in this proposed process can be foreseen from fatty acid composition of the feedstock triglycerides. By blending the obtained hydrocarbons from Rapeseed Oil with an adequate amount of fossil diesel, the blended fuel could satisfy the specification standard of fossil diesel in Japan.
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reactivity of triglycerides and fatty acids of Rapeseed Oil in supercritical alcohols
Bioresource Technology, 2004Co-Authors: Yuichiro Warabi, Dadan Kusdiana, Shiro SakaAbstract:Abstract A catalyst-free biodiesel production method with supercritical methanol has been developed that allows a simple process and high yield because of simultaneous transesterification of triglycerides and methyl esterification of fatty acids. From these lines of evidence, we expected that similar results would be attained with the use of various alcohols by the supercritical treatment. However, it still remains unclear which type of reaction, transesterification or alkyl esterification, is faster. This parameter would be important in designing the optimum reaction conditions of the supercritical alcohol method. Therefore, we studied the effect of transesterification of triglycerides and esterification of fatty acids in Rapeseed Oil. Reaction temperature was set at 300 °C, and methanol, ethanol, 1-propanol, 1-butanol or 1-octanol was used as the reactant. The results showed that transesterification of triglycerides (Rapeseed Oil) was slower in reaction rates than alkyl esterification of fatty acids for any of the alcohols employed. Furthermore, saturated fatty acids such as palmitic and stearic acids had slightly lower reactivity than that of the unsaturated fatty acids; oleic, linoleic and linolenic.
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Biodiesel fuel from Rapeseed Oil as prepared in supercritical methanol
Fuel, 2001Co-Authors: Shiro Saka, Dadan KusdianaAbstract:Transesterification reaction of Rapeseed Oil in supercritical methanol was investigated without using any catalyst. An experiment has been carried out in the batch-type reaction vessel preheated at 350 and 400 °C and at a pressure of 45-65 MPa, and with a molar ratio of 1:42 of the Rapeseed Oil to methanol. It was consequently demonstrated that, in a preheating temperature of 350 °C, 240 s of supercritical treatment of methanol was sufficient to convert the Rapeseed Oil to methyl esters and that, although the prepared methyl esters were basically the same as those of the common method with a basic catalyst, the yield of methyl esters by the former was found to be higher than that by the latter. In addition, it was found that this new supercritical methanol process requires the shorter reaction time and simpler purification procedure because of the unused catalyst.
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Kinetics of transesterification in Rapeseed Oil to biodiesel fuel as treated in supercritical methanol
Fuel, 2001Co-Authors: Dadan Kusdiana, Shiro SakaAbstract:A kinetic study in free catalyst transesterification of Rapeseed Oil was made in subcritical and supercritical methanol under different reaction conditions of temperatures and reaction times. Runs were made in a bath-type reaction vessel ranging from 200 °C in subcritical temperature to 500 °C at supercritical state with different molar ratios of methanol to Rapeseed Oil to determine rate constants by employing a simple method. As a result, the conversion rate of Rapeseed Oil to its methyl esters was found to increase dramatically in the supercritical state, and reaction temperature of 350 °C was considered as the best condition, with the molar ratio of methanol in Rapeseed Oil being 42.
Dadan Kusdiana - One of the best experts on this subject based on the ideXlab platform.
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reactivity of triglycerides and fatty acids of Rapeseed Oil in supercritical alcohols
Bioresource Technology, 2004Co-Authors: Yuichiro Warabi, Dadan Kusdiana, Shiro SakaAbstract:Abstract A catalyst-free biodiesel production method with supercritical methanol has been developed that allows a simple process and high yield because of simultaneous transesterification of triglycerides and methyl esterification of fatty acids. From these lines of evidence, we expected that similar results would be attained with the use of various alcohols by the supercritical treatment. However, it still remains unclear which type of reaction, transesterification or alkyl esterification, is faster. This parameter would be important in designing the optimum reaction conditions of the supercritical alcohol method. Therefore, we studied the effect of transesterification of triglycerides and esterification of fatty acids in Rapeseed Oil. Reaction temperature was set at 300 °C, and methanol, ethanol, 1-propanol, 1-butanol or 1-octanol was used as the reactant. The results showed that transesterification of triglycerides (Rapeseed Oil) was slower in reaction rates than alkyl esterification of fatty acids for any of the alcohols employed. Furthermore, saturated fatty acids such as palmitic and stearic acids had slightly lower reactivity than that of the unsaturated fatty acids; oleic, linoleic and linolenic.
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Biodiesel fuel from Rapeseed Oil as prepared in supercritical methanol
Fuel, 2001Co-Authors: Shiro Saka, Dadan KusdianaAbstract:Transesterification reaction of Rapeseed Oil in supercritical methanol was investigated without using any catalyst. An experiment has been carried out in the batch-type reaction vessel preheated at 350 and 400 °C and at a pressure of 45-65 MPa, and with a molar ratio of 1:42 of the Rapeseed Oil to methanol. It was consequently demonstrated that, in a preheating temperature of 350 °C, 240 s of supercritical treatment of methanol was sufficient to convert the Rapeseed Oil to methyl esters and that, although the prepared methyl esters were basically the same as those of the common method with a basic catalyst, the yield of methyl esters by the former was found to be higher than that by the latter. In addition, it was found that this new supercritical methanol process requires the shorter reaction time and simpler purification procedure because of the unused catalyst.
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Kinetics of transesterification in Rapeseed Oil to biodiesel fuel as treated in supercritical methanol
Fuel, 2001Co-Authors: Dadan Kusdiana, Shiro SakaAbstract:A kinetic study in free catalyst transesterification of Rapeseed Oil was made in subcritical and supercritical methanol under different reaction conditions of temperatures and reaction times. Runs were made in a bath-type reaction vessel ranging from 200 °C in subcritical temperature to 500 °C at supercritical state with different molar ratios of methanol to Rapeseed Oil to determine rate constants by employing a simple method. As a result, the conversion rate of Rapeseed Oil to its methyl esters was found to increase dramatically in the supercritical state, and reaction temperature of 350 °C was considered as the best condition, with the molar ratio of methanol in Rapeseed Oil being 42.
Stasys Slavinskas - One of the best experts on this subject based on the ideXlab platform.
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performance of direct injection off road diesel engine on Rapeseed Oil
Renewable Energy, 2006Co-Authors: Gvidonas Labeckas, Stasys SlavinskasAbstract:This article presents the comparative bench testing results of a naturally aspirated, four stroke, four cylinder, water cooled, direct injection Diesel engine operating on Diesel fuel and cold pressed Rapeseed Oil. The purpose of this research is to study Rapeseed Oil flow through the fuelling system, the effect of Oil as renewable fuel on a high speed Diesel engine performance efficiency and injector coking under various loading conditions.
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performance of direct injection off road diesel engine on Rapeseed Oil
Renewable Energy, 2006Co-Authors: Gvidonas Labeckas, Stasys SlavinskasAbstract:Abstract This article presents the comparative bench testing results of a naturally aspirated, four stroke, four cylinder, water cooled, direct injection Diesel engine operating on Diesel fuel and cold pressed Rapeseed Oil. The purpose of this research is to study Rapeseed Oil flow through the fuelling system, the effect of Oil as renewable fuel on a high speed Diesel engine performance efficiency and injector coking under various loading conditions. Test results show that when fuelling a fully loaded engine with Rapeseed Oil, the brake specific fuel consumption at the maximum torque and rated power is correspondingly higher by 12.2 and 12.8% than that for Diesel fuel. However, the brake thermal efficiency of both fuels does not differ greatly and its maximum values remain equal to 0.37–0.38 for Diesel fuel and 0.38–0.39 for Rapeseed Oil. The smoke opacity at a fully opened throttle for Rapeseed Oil is lower by about 27–35%, however, at the easy loads its characteristics can be affected by white coloured vapours. Oil heating to the temperature of 60 °C diminishes its viscosity to 19.5 mm 2 s −1 ensuring a smooth Oil flow through the fuel filter and reducing the brake specific energy consumption at light loads by 11.7–7.4%. Further heating to the temperature of 90 °C offers no advantages in terms of performance. Special tests conducted with modified fuel injection pump revealed that coking of the injector nozzles depends on the engine performance mode. The first and second injector nozzles that operated on pure Oil were more coated by carbonaceous deposits than control injector nozzles that operated simultaneously on Diesel fuel.
Aleksander Prociak - One of the best experts on this subject based on the ideXlab platform.
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the influence of Rapeseed Oil based polyols on the foaming process of rigid polyurethane foams
Industrial Crops and Products, 2016Co-Authors: Maria Kuranska, Aleksander ProciakAbstract:Abstract The foaming process of water-blown rigid polyurethane foams with different contents of a Rapeseed Oil-based polyol was analyzed. The present work reports for an analysis of the foaming process using foam qualification system FOAMAT—which allows recording characteristic parameters such as the dielectric polarization, rise height of a sample, pressure, temperature during a foaming process. A replacement of a petrochemical polyol by a Rapeseed Oil-based polyol (ROP) affects the foaming process of rigid polyurethane foams by reducing the reactivity of the system. Increasing the content of ROP resulted in a smaller decrease in the dielectric polarization which reflects slower gelling and foaming reactions.
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polyurethane polyisocyanurate foams modified with hydroxyl derivatives of Rapeseed Oil
Industrial Crops and Products, 2015Co-Authors: Maria Kuranska, Aleksander Prociak, Mikelis Kirpluks, Ugis CabulisAbstract:Abstract Three types of Rapeseed Oil-based polyols were used for synthesis of rigid polyurethane–polyisocyanurate (PUR–PIR) foams with three different isocyanate indices (150, 200 and 250). The bio-polyols were synthesized using epoxidation and opening of oxirane rings, transesterification with triethanolamine and transamidization with diethanolamine. Increasing isocyanate index gave rigid foams with increased thermal stability, improved mechanical properties and decreased flammability. Mechanical and thermal properties of rigid PUR–PIR foams depended also on type of bio-polyols. PUR–PIR systems modified with bio-polyol synthesized in the reaction of epoxidation and oxirane ring opening had the largest number of isotropic cells, what beneficially influenced on compressive strength and heat insulating properties of obtained foams.
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effect of different Rapeseed Oil based polyols on mechanical properties of flexible polyurethane foams
Journal of Applied Polymer Science, 2012Co-Authors: Piotr Rojek, Aleksander ProciakAbstract:Two Rapeseed-Oil-based polyols were synthesized by partial epoxidation of the double bonds in fatty acid chains and overall opening oxirane rings by using diethylene glycol. Flexible polyurethane foams with varied isocyanate index and modified by partial substitution of petrochemical polyether triol with Rapeseed-Oil-derived polyols were obtained. Bio-polyols: Polyol I and Polyol II differed in functionalities (2.5 and 5.2, respectively) and hydroxyl values (114 and 196 mg KOH/g, respectively). Influence of the bio-polyols on mechanical properties, resilience, apparent density, and cellular structure of synthesized foams was investigated. Compression properties were examined and compared via determining compression values and compression stress—strain characteristics, as well as tensile strength and elongation at break were estimated. Foams modified with Polyol I had higher values of resilience and elongation at break than those with Polyol II, while higher tensile and compression strength and superior cell structure were observed in the case of foams modified with Polyol II. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
Maria Kuranska - One of the best experts on this subject based on the ideXlab platform.
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the influence of Rapeseed Oil based polyols on the foaming process of rigid polyurethane foams
Industrial Crops and Products, 2016Co-Authors: Maria Kuranska, Aleksander ProciakAbstract:Abstract The foaming process of water-blown rigid polyurethane foams with different contents of a Rapeseed Oil-based polyol was analyzed. The present work reports for an analysis of the foaming process using foam qualification system FOAMAT—which allows recording characteristic parameters such as the dielectric polarization, rise height of a sample, pressure, temperature during a foaming process. A replacement of a petrochemical polyol by a Rapeseed Oil-based polyol (ROP) affects the foaming process of rigid polyurethane foams by reducing the reactivity of the system. Increasing the content of ROP resulted in a smaller decrease in the dielectric polarization which reflects slower gelling and foaming reactions.
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polyurethane polyisocyanurate foams modified with hydroxyl derivatives of Rapeseed Oil
Industrial Crops and Products, 2015Co-Authors: Maria Kuranska, Aleksander Prociak, Mikelis Kirpluks, Ugis CabulisAbstract:Abstract Three types of Rapeseed Oil-based polyols were used for synthesis of rigid polyurethane–polyisocyanurate (PUR–PIR) foams with three different isocyanate indices (150, 200 and 250). The bio-polyols were synthesized using epoxidation and opening of oxirane rings, transesterification with triethanolamine and transamidization with diethanolamine. Increasing isocyanate index gave rigid foams with increased thermal stability, improved mechanical properties and decreased flammability. Mechanical and thermal properties of rigid PUR–PIR foams depended also on type of bio-polyols. PUR–PIR systems modified with bio-polyol synthesized in the reaction of epoxidation and oxirane ring opening had the largest number of isotropic cells, what beneficially influenced on compressive strength and heat insulating properties of obtained foams.
