Procedure for High FFA Feedstocks
Measure FFA level.
Add 2.25 g methanol and 0.05 g sulfuric acid for each gram of free fatty acid in the oil or fat.
Agitate for one hour at 60-65oC.
Let the mixture settle. Methanol-water mixture will rise to the top. Decant the methanol, water, and sulfuric acid layer.
Take bottom fraction and measure new FFA level.