Introduction to the ET Process
The ET Process® refers to the Enzymatic Transesterification Process. The conversion of lipid to biodiesel or fatty acid alkyl ester (FAAE) involves transesterification and/or esterification. The only difference is with the starting material.
►Esterification 
for fatty acids ►Transesterification for triglycerides
Unlike the chemical approach, the ET Process® can accept both triglyceride and fatty acid as feedstocks, therefore eliminating the need for a costly refining process. The reaction is carried out in an inert solvent environment so as to protect lipase from deactivation due to methanol/ethanol or glycerol. Normally, the reaction is done at room temperature. Pure biodiesel and pure glycerol can be obtained directly from the reactor after removal of inert solvent.
- No wastewater, no chemical disposal, no toxic compound involved
- Safe, simple-to-operate and cost-effective technology that can be centralized or distributed in small or large scale units
- Degummed crude is all that is needed. The oil can be virgin, used, vegetable oil or animal fats.
- Handling of oil seeds and crude oil storage are simplified since rancidity stops becoming a limiting factor in the process of conversion.
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(upper layer) biodiesel
(lower layer) glycerol; line clearly marks separation; no soap present; glycerol only needs to be decolorized and stripped of alcohol or any volatile solvent
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