PREPARATION OF BIODIESEL FROM KARANJA OIL(part 9)

Rinsing Methyl Ester

• Methyl ester was poured off into a separate clean container, where it was washed free of any remaining soaps, salts or free fatty acids.
• Warm water was added to the methyl ester. It was stirred lightly and then allowed to settle. The warm water was heated in the main reactor itself.
• When the water had cleanly separated from the methyl esters, the water was drained out from the bottom.
• The process was repeated until the discarded rinse water reached ph level of 6-7 and no soap bubbles appeared in it.
• If the liquid remaining is cloudy, there is water being retained in the fuel, and it will need to be reheated slowly to evaporate out the water. Any white substances forming at the bottom or any bubbles forming at the surface is a sign of soaps and should be removed or the liquid should be re-washed. The cleaned methyl ester is a version of biodiesel.

Observation for Production of Biodiesel

• The optimum condition for the reaction was found to be the following: for every liter of oil used, 200ml of methanol needed to be used.
• The optimum temperature for the reaction was identified to be in the range of 53°C to 58°C for methanol.
• Vigorous stirring and heating is of paramount importance for better conversion efficiency.
• The ideal time for the completion of reaction is around 3-4hrs.
• Reaction with ethanol is difficult unless 2 conditions are met – a) Requirement of anhydrous ethanol and b) Requirement of closed system to prevent ethanol from absorbing water.
• The FFA content of oil needs to be determined and appropriate quantity of Lye needs to be added in order to neutralize excess acid. This excess acid is present when the oil gets heated.
• Care must be taken to prevent the process of saponification from occurring. This can be ensured by proper heating and stirring.
• About 4.5 Liters of Biodiesel has been obtained for an input quantity of 6L oil.

Representative APR 391%

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