Difference between revisions of "Free fatty acid"
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Vegetable oil consists of triglycerides - that is, chains of three fatty acids joined by a glycerol molecule. | Vegetable oil consists of triglycerides - that is, chains of three fatty acids joined by a glycerol molecule. | ||
| − | The presence of heat and water in a fryer causes some of these | + | The presence of heat and water in a fryer causes some of these fatty acid chains to split from the glycerol molecule - they become "free" fatty acids (FFAs). |
Measuring the level of FFAs in the oil is important for biodiesel production because they neutralise the alkali catalyst used to split the triglycerides. This is why [[Waste Vegetable Oil]] must be titrated, and extra alkali catalyst added to compensate. | Measuring the level of FFAs in the oil is important for biodiesel production because they neutralise the alkali catalyst used to split the triglycerides. This is why [[Waste Vegetable Oil]] must be titrated, and extra alkali catalyst added to compensate. | ||
Revision as of 22:33, 26 February 2013
Vegetable oil consists of triglycerides - that is, chains of three fatty acids joined by a glycerol molecule.
The presence of heat and water in a fryer causes some of these fatty acid chains to split from the glycerol molecule - they become "free" fatty acids (FFAs).
Measuring the level of FFAs in the oil is important for biodiesel production because they neutralise the alkali catalyst used to split the triglycerides. This is why Waste Vegetable Oil must be titrated, and extra alkali catalyst added to compensate.
This neutralisation of the free fatty acids by the catalyst also produces unwanted water in the reaction (acid + base -> salt + water).
