Author Topic: Green chemistry: Biodiesel made with Vegetable oil  (Read 3194 times)

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Green chemistry: Biodiesel made with Vegetable oil
« on: November 23, 2011, 09:23:43 am »
Author : Rajpreet kaur Ishar
International Journal of Scientific & Engineering Research Volume 2, Issue 10, October-2011
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Abstract: Biodiesel is a revolutionary step in the world of fuel. The pollutionary effects of biodiesel is much less than mineral fuels and even cost less. because the fuel features(power ,combustibility/safety, storage, production/refining, fuel availability/economy, lubricity,enviromental impact, usage) of it. Although biodiesel is greatly promising, its use has been introduced gradually all over the world. In fact, most countries are establishing rules to its introduction based on mixture contents with mineral diesel in form of (B100, B20, and B10).The increased demand and high price for energy sources are driving efforts to convert organic compounds into useful hydrocarbon fuel. It can be obtained by Transesterification with alcohol i.e methanol majorly of vegetable oil and animal fat feedstock. Biodiesel can also be used as a heating fuel in domestic and commercial boilers, a mix of heating oil and biofuel which is standardized and taxed slightly differently than diesel fuel used for transportation. It is sometimes known as "bioheat" (which is a registered trademark of the National Biodiesel Board [NBB] and the National Oilheat Research Alliance [NORA] in the U.S., and Columbia Fuels in Canada).   
Index Terms-biodiesel, vegetable oil, Transesterification ,Fuel features

1.    Introduction
Bio-diesel is the Fuel which consists of  hydrocarbon  i.e. esters of  methyl and ethyl made by the reaction of vegetable oil. It is the fuel which is used in vehicles to run. Bio-diesel is renewable  energy resources .Bio-diesel is one of the economic way in united states. Biodiesel is less polluted than petroleum and diesel. The absence of sulfur in 100% biodiesel should extend the life of catalytic converters. Biodiesel fuel can also be used in combination with heating oil to heat residential and industrial buildings. This can reduce dependence on non-renewable and increasingly expensive heating oil. Biodiesel burns cleaner & is made of non-toxic chemicals so it does not give out poisonous fumes, unlike the ordinary fuel.
                    2. Procedure:
Measure out 200 ml of antifreeze and put it in one plastic container. The oil needs to be pre-heated, and well filtered before use to prevent coagulation. Add in lye so that the antifreeze is absorbed. Cover container and mix well by shaking it. It is mixed when it starts to feel warm and is foamy. The mixture has now become sodium methoxide .Blend 1 liter of vegetable oil with the sodium meth oxide in a blender for 20 minutes.  Pour mixture into a bottle and wait 8 hours until the byproduct, glycerin, separates form the biodiesel. The glycerin will be on the solid on the bottom. Separate out the biodiesel by pouring into a glass bottle. Prepare a wash bottle by poking a small hole in the corner of the bottle and covering it with duct tape. Wash the biodiesel by pouring it into the wash bottle and adding in a liter of water Roll the bottle around to mix it and then remove the duct tape and drain the water. Repeat the washing process until the biodiesel is clear. This may need to be done numerous times over the course of a week to complete the process. Store the biodiesel in a glass container until ready to use.
3. Test:   Add 3ml of Bio-diesel to 27ml of methanol. Shake for about 30 seconds and allow to sit for 5 minutes. The methanol should completely absorb the Bio-diesel. No fall out should be visible .
4. Reaction Involved Transesterification: Animal & plant fats & oils are typically made of triglycerides which are esters of free fatty acids with the trihydric alcohol, glycerol. In the transesterification process, the alcohol is deprotonated with a base to make it a stronger nucleophile. Commonly, ethanol or methanol is used. As can be seen, the reaction has no other inputs than the triglyceride & the alcohol. Normally, this reaction will precede either exceedingly slowly or not at all. Heat, as well as an acid or base are used to help the reaction more quickly.

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