Storage condition depends upon the source that you have chosen to produce biodiesel. The fatty acid profile is the key factor. More the PUFA more chances for oxidation. Moreover it also depends on the conditions of storage. The following have positive effect on oxidation (degradation) of biodiesel into ketones and aldehydes: Container material, head space air, light conditions, added materials/anti-oxidants.
Metal containers, exposure to sunlight, exposure to air tends to oxidize biodiesel over a long term. Addition of antioxidant (like BHT), storage in plastic barrels, storage in air tight container, storage away from light is ideal for reduction in oxidation.
Bio-diesel should not be exposed to air inorder to prevent it from oxidation and also it should be in contact with metal bodies i.e not to be stored in metal containers. So a high density plastics may be used for storing bio-diesels
it depends on the source of biodiesel (type of free fatty acid) which plays a vital role about the way of storage, always store biodiesel in clean airtight containers to prevent contamination with a fast growing microbe. moreover storage conditions are important. For example, biodiesel should not be stored or transported in copper, brass, bronze, lead, tin, or zinc because these metals will hasten degradation. Instead, choose containers made from aluminum, steel, fluorinated polyethylene, fluorinated polypropylene, Teflon®, or fiberglass.
Heat, sunlight, and oxygen will also cause biodiesel to degrade more rapidly, so storage should minimize exposure to these conditions.
To prevent free water accumulation, make sure storage tanks are cleaned and dried before biodiesel is put into the tank. As much as possible, keep only a small air space above the fuel – 2% air space is recommended in order to allow for thermal expansion. More air space may allow the biodiesel to accumulate more water from the air. If possible, drain free water off the bottom of storage tanks on a regular basis.
The dissolved water in biodiesel can also cause problems if the fuel is stored for more than a few months. This water can cause acids to form in the fuel, which can eventually eat a hole in the storage tank.
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