Water content
Hydrolysis of triglycerides
At high temperature, water can hydrolyze triglycerides and form free fatty acids
Catalyst type
Catalyst concentration
The optimum catalyst concentration would vary depending upon the type of type of raw material and catalyst
Free fatty levels in feedstock’s
Biodiesel feedstock’s vary from edible oils to stinking wastes
Refined vegetable oils
Crude soybean oil
Restaurant waste grease
Animal fat
Trap grease
Price decreases as FFAs increase
High FFA feeds need special processing to avoid soap
But certain processes use FFA as the feed.