When plants photosynthesise they produce glucose which can converted to starch or vegetable oils or is used for respiration. We can use the oils for food and fuel.
We extract these oils but only some are worthwhile, olives, rapeseed seeds and sunflowers. After harvesting plans are seived to remove substances that can cause damage to machinery. The plant materials are then crushed to form a mixture of plant oils and plant materials.
To separate the oil from plant material press into the mixture so that oil and water is released. They separate into two layers. The water is then drained and the oil is filtered, then heated to get rid of the other impurities such as the remaining water and bacteria or by the oil dissolving in a solvent that can then be easily separated, this is by using distillation so only the oil remains.
Biodiesel is a biofuel and can be used for fueling vehicles, alone or blended with ordinary diesel. It is converted into a biodiesel by reacting it with methanol and sodium hydroxide. Biodiesel molecules contain oxygen ions so produces less carbon monoxide and less sulphur dioxide.
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