Method for purifying biodiesel fuel
AssigneeKagoshima University
InventorHirokazu Takanashi
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Abstract
Provided is a method for purifying a biodiesel fuel while completely preventing or greatly reducing generation of waste water. The present invention relates to a method for purifying a biodiesel fuel characterized by applying an electric field to or heating a crude biodiesel fuel and a method for purifying a biodiesel fuel characterized by adding water (preferably containing a demulsifier such as an inorganic calcium salt or a magnesium salt) to a crude biodiesel fuel to form W/O emulsion, and breaking the emulsion by application of an electric field or heating, etc.
Claims12
A method for purifying a biodiesel fuel, comprising the steps of:
- subjecting a raw oil and methanol to transesterification using an alkaline catalyst to obtain a crude biodiesel fuel comprising methanol, alkali metals and free glycerin,
- applying an electric field to the crude biodiesel fuel obtained by transesterification using the alkaline catalyst, and
- separating a fuel phase and a waste-liquid phase after the application of the electric field to obtain a purified biodiesel fuel.
Dependencies are inferred from the claim text.