فهرس المقالات Transesterification

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  1 - Transesterification of trimethylphosphate catalyzed by sodium aloxides
  Saved Mojtaba Moosavi Shokofe Aghabevzi Mir Abdullah S. Sadiadi
  The transesterification process of trimethylphosphate with ethanol and isopropanol is examined. It is found that the reaction does not proceed in the absence of base even at temperature up to 100°C, whereas in the presence of sodium alkoxide as a catalyst it takes p أکثر

  The transesterification process of trimethylphosphate with ethanol and isopropanol is examined. It is found that the reaction does not proceed in the absence of base even at temperature up to 100°C, whereas in the presence of sodium alkoxide as a catalyst it takes place at room temperature leading to a mixture of mono-,bi-, tri-substitute esters as well as the minor by-products resulting from the nucleophilic attack of the alkoxide ion on the alkyl groups of the starting ester.. The substitution extent is dependent on the relative concentration of the reactants, the temperature, the solvent, and the amount of the catalyst used. تفاصيل المقالة
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  2 - A Comparative Study of Biodiesel Production from Beef Bone Marrow
  Z. Didar
  This study is concerned with the viability of producing biodiesel from waste beef bone fat and evaluate this product according to the quality requirements defined by ASTM D- 6751. Accordingly, beef bone fat was heated to remove the moisture under vacuum at 60 . Alkaline أکثر

  This study is concerned with the viability of producing biodiesel from waste beef bone fat and evaluate this product according to the quality requirements defined by ASTM D- 6751. Accordingly, beef bone fat was heated to remove the moisture under vacuum at 60 . Alkaline Catalysed Transesterfication was carried out by using 6:1 molar ratio of ethanol to fat in the presence of 1% w/w sodium hydroxide, at 78for 2h. Acid-Catalysed Transesterfication reaction of beef bone fat was carried out using 30:1 molar of ethanol to fat in the presence of 1% sulfuric acid at 78, for 69h. Two- stage acid base transesterification is also carried out for biodiesel production. The resulted biodiesel from alkaline reaction meet the quality requirement better than the acid reaction but both biodiesel did not comply with the European Standard parameters namely kinematic viscosity, specific gravity, density, and cloud point تفاصيل المقالة
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  3 - Synthesis of biodiesel from <i>Reseda luteola</i> L. seeds
  Ali Shafaghat Parisa Morrabi Masoud Shafaghatlonbar Farshid Salimi
  The present study reports the preparation of biodiesel from Reseda luteola L. seeds oil using organic solvent. The hexane extract was obtained by Soxhlet apparatus and subjected to transesterification method to result simple esters. The final prepared composition was an أکثر

  The present study reports the preparation of biodiesel from Reseda luteola L. seeds oil using organic solvent. The hexane extract was obtained by Soxhlet apparatus and subjected to transesterification method to result simple esters. The final prepared composition was analysed by using GC-GC/MS. Thirty- three components representing 92.7% of the extracted oil of R. luteola were identified, among them, 9, 12-octadecadienoic acid methyl ester (23.8%), 9-octadecenoic acid methyl ester (12.2%), hexadecanoic acid methyl ester (9.9%) and n-decane (6.1%) were the major compounds. The organic extract of seeds from R. luteola detected as an important source of unsaturated fatty acid ester compounds. تفاصيل المقالة
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  4 - Esterification of Waste Cooking Oil Followed by Transesterification by CaO Nanoparticles: Application of Taguchi Methodology
  Ali Shokuhi Rad Poyesh Mehdipour Ali Vaziri Ali Mirabi Ehsan Binaeian
  10.22034/jna.2017.02.008
  In order to produce biodiesel from waste cooking oil and optimize its yield, a two-stage process of esterification/ transesterification has been used in this study. First, we used the acidic catalysts H2SO4 in order to diminish the content of free fatty acid (FFA) in oi أکثر

  In order to produce biodiesel from waste cooking oil and optimize its yield, a two-stage process of esterification/ transesterification has been used in this study. First, we used the acidic catalysts H2SO4 in order to diminish the content of free fatty acid (FFA) in oil that caused reducing the oil acidity from 6.1% to 0.57% through esterification. Then, the biodiesel was produced by transesterification of resulted oil using heterogeneous CaO nanoparticles as catalyst. At each stage, the best possible conditions have been determined by applying Taguchi methodology for each major variable, including time, temperature, alcohol/oil molar ratio, and the amount of catalyst. The optimum conditions for esterification are achieved at 80&deg;C temperature, 120 minutes time, 6:1 molar ratio of alcohol/oil, and H2SO4 content of 1% (w/w oil). The optimum condition for transesterification were found in 100 &deg;C temperature, 90 minutes time, 8:1 molar ratio of alcohol/oil, and 3% (w/w oil) of CaO nanoparticles as catalyst. After applying full optimization of these two stages, the yield of the produced biodiesel has achieved 96.4%. تفاصيل المقالة