The process of converting vegetable oil into bio diesel fuel is called transesterification or neutralizing the free fatty acids in oil, removing the glycerol and creating an alcohol ester. This is accomplished by mixing methanol (wood alcohol) with lye (sodium hydroxide) to make sodium methoxide. This liquid is then mixed into vegetable oil. The entire mixture then settles. Glycerol is left on the bottom and methyl esters or bio diesel is left on top. Finally, the methyl esters is washed, filtered and refined.
Schematically, it can be described as follows (see also the Technological Scheme):
100 kg of oil + 15 kg methanol + 1 kg Sodium Hydroxide = 100 kg bio diesel (methyl esters) + 10 kg (impure) glycerol
We use innovative and economic technology of bio diesel production, which was created by Bio diesel Technologies together with supplier of equipment after careful study of all available options. Its major features are:
compact size (partly due to usage of centrifugal cleaning for separation of glycerol),
- low-pressure transesterification process, realized by reaction columns and low cost gravity separators,
- extraction of glycerol without water,
- distillation of final product to ensure the highest quality.
Technological process can be splitted into the following phases:
- Esterification: mixing of oil with the above mentioned catalizator
- Methanol desorbtion: excess methanol is removed by vacuum distillation.
- Glycerol neutralization: the glycerol phase contains: catalyst, some soaps, methanol, neutralization takes place with phosphoric acid, leaving salts (potassium phosphate = fertilizer) as a co-products and distillation of biodiesel under vacuum
- Separation: once the reaction is complete two major products exist: raw glycerol and bio diesel which are separated by centrifuge