The importance of Fresh Animals
To understand the challenge Daka has with decayed animals and the extra process it requires in the production of biodiesel, it is beneficial to understand the composition of a molecule of fat. The molecule of fat optimally consists of a glycerol molecule bound together with three molecules of fatty acid. In this composition it is called triglycerides and the more triglycerides the better the fat quality. However, the glycerol molecule can “lose” molecules of fatty acid, when it is disintegrated, and can either turn into diglyceride (linked to two molecules of fatty acid) or monoglyceride (linked to only one molecule of fatty acid). The discarded molecules of fatty acid become free fatty acids. The amount of free fatty acids is the center of the problem.
The formation of free fatty acids begins by reprieve (when an animal decays). A high proportion of free fatty acids in the animal fat induces that we have to process the fat two times – Firstly, we have to use acid to convert the free fatty acids into biodiesel, before the second round, where we can convert the molecules of fat into biodiesel.