Just FYI for those who may not know.......Obtaining Glycerin from fats (animal or vegetable) can be done with lye and water.......this is how soap is made.... the Lye/ Water mix is Basic and the Fat is an Acid........Fats contain triglycerides (compound made of three fatty acid molecules, attached to a single molecule of glycerol)....when the Acidic triglycerides contact the Basic Lye /Water combination, which can be sodium or potassium, it splits the Glycerol molecule, which becomes Glycerin, from the 3 soap Molecules (salt).......this is just a basic explanation of how Glycerin can be obtained....triglyceride + sodium hydroxide (or potassium hydroxide) → glycerol + 3 soap molecules....it is then further processed to separate the Salt (soap) from the glycerol.....Not sure but maybe this should not be posted here.....Let me know......