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Situation Analysis: Water Washing Bio-diesel Reaction Products

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Reports: New and Update Articles 

 

Situation

Analysis: Water Washing Bio-diesel Reaction Products

 

 

A critical step in the production of

Bio-diesel, particularly when the feed vegetable oil contains free

fatty acids, is the removal of the soap that is formed as part of the

tranesterification reaction and is dissolved in the bio-diesel. Soap is

the salt of fatty acids; and during the bio-diesel esterification

reaction, the free fatty acids in the oils react with the Sodium (or

Potassium) ions of the methoxide or ethoxide to form the soap. Two

approaches have been advanced for performing this chemical process

Separation task: Extraction of the soap with water, and Extraction of

the soap with resin. The former extraction task is often described, in

local bio-diesel production operations, as washing the bio-diesel

[fuel]. However, the two approaches are based on the same chemical

science.

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