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Synthesis and Determination of Biodiesel: An Experiment for High School Chemistry Laboratory.

BIODIESEL SYNTHESIS lab report | Biodiesel - Scribd

Recent environmental regulations regarding diesel fuel standards and the role the Midwest may play in future fuel production provides an opportunity to relate principles of organic chemistry to everyday life. Biodiesel is the transesterification product of triglycerides of vegetable oils with methanol to form fatty acid methyl esters (FAMEs). The resultant FAME fuel has decreased viscosity compared to vegetable oil and fuel properties similar to petroleum-based diesel fuel. In this two week lab sequence students synthesize and evaluate fatty acid methyl esters from simulated waste vegetable oil. To maximize product, students determine weight percent of free fatty acid in the sample and convert the acids to FAMEs via acid-catalyzed Fischer esterification. After conversion of FFA, the remaining mono-, di-, and triglycerides in the waste vegetable oil are converted to FAMEs by base-catalyzed transesterification. Finally, the completeness of the conversion product is determined indirectly by analysis of total, free, and combined glycerol in the final product by stoichiometric oxidation of vicinal alcohols by periodic acid. By determining the weight of glycerol in a specific weight sample of product biodiesel, the student determines whether the glycerol concentration is low enough to meet the specifications for marketable biodiesel.

Making Biodiesel From Waste Vegetable Oil: 16 Steps …

Biodiesel has gained attention in recent years as a renewable and environmentally friendly fuel source. A laboratory experiment designed for high school students is described to study biodiesel production. Under optimum conditions, the time of running the reaction of biodiesel synthesis was less than a half-hour. Moreover, based on the difference in density and solubility of reactants and products in the transesterification, one visualizing method of detection of biodiesel product was suggested. The results demonstrated that the visualizing method was simple, quick, and effective in determining whether biodiesel was produced. This proposed experiment is typically completed in less than two one-hour laboratory periods, which makes it suitable for a high school chemistry laboratory.



Drawbacks of standard methods

Standard methods for producing biodiesel, a mixture of alkyl (methyl or ethyl) esters of fatty acids, is to heat vegetable oils or mixed animal-vegetable oils with (a) a strong alkali and (b) methanol or ethanol.


Biodiesel Synthesis from Domestic Used Cooking Oil in ..

Biodiesel is a renewable, biodegradable fuel manufactured domestically from vegetable oils, animal fats, or recycled restaurant grease. It is a cleaner-burning replacement for petroleum diesel fuel. Biodiesel meets both the biomass-based diesel and overall advanced biofuel requirement of the .

Production of Biodiesel from Waste Vegetable Oil via …

Biodiesel (FAME) is a clean-burning fuel derived from vegetable oils or animal fat and is an advantageous alternative to fossil diesel fuel because of its biodegradability, bio-renewable nature, very low sulfur content and toxicity, low volatility or flammability, good transport and storage properties, higher cetane number, and its salutary atmospheric CO2 balance for production []. Treatments that circumvent the significant problems associated with the high viscosity of plant oils when used as engine fuels are its dilution, micro emulsification, pyrolysis, and transesterification with methanol; the latter approach is used most commonly. The glycerin formed during transesterification is also important because of its numerous applications in the food, cosmetic, and pharmaceutical sectors. FAME is not only currently useful as a diesel fuel additive, but it is also marketed as green industrial degreasing solvents; as diluents for pigments, paints, and coatings, and for military engine fuel applications [].

How To Make Biodiesel from Vegetable Oil - ThoughtCo

Biodiesel synthesis is an interesting way to introduce transesterification reactions as well as a way to discuss alternative fuels. Biodiesel is synthesized from new vegetable oil by the reaction with methoxide, formed separately from methanol and sodium hydroxide. After the reaction is completed, the mixture must then be left to separate, forming a glycerin and a biodiesel layer. The glycerin layer is pulled off using a separatory funnel and the biodiesel and glycerin layers can be analyzed using IR (or other techniques).

Making biodiesel is quite similar to making soap, but with the added advantage of the product being an alternative fuel. Students are very interested in biodiesel. This experiment might also work well being run side by side with the making of soap as a comparison.

"Biodiesel Synthesis from Domestic Used Cooking Oil …

Biodiesel is more viscous than petroleum heating oil, and bioheating oil is more viscous than biodiesel, so if biodiesel doesn't work in your furnace then bioheating oil won't either, though in both cases pre-heating the oil might work.

This method of making bioheating oil works well, but it's probably a moveable feast -- try adapting it, experiment a bit.