US 5,972,057 AGranted

Method and apparatus for producing diesel fuel oil from waste edible oil

AssigneeLonford Development Limited

InventorsShigeto Hayafuji, Takeo Shimidzu, Shosei Oh, Hiroaki Zaima

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Abstract

A production method of diesel fuel oil from waste oil, in which a vegetable diesel fuel oil can be obtained by utilizing as a raw material a waste edible oil dumped from restaurant, food industry, home, etc. and scarcely utilized. The production method comprises the steps of: removing solid materials contained in a waste edible oil; heating the waste edible oil from which solid materials have been removed to a predetermined temperature, thereby removing moisture and materials of odor contained in the waste edible oil by evaporation; dissolving in alcohol a catalyst composed of alkaline material, thereby preparing an alcoholic solution containing the catalyst; mixing the waste edible oil with the alcoholic solution containing the catalyst and stirring the waste edible oil and alcoholic solution, thereby obtaining a reaction product; separating said reaction product into a light solution and a heavy solution; mixing the light solution with a solid absorbent, thereby impurities contained in the light solution being absorbed by the solid absorbent; separating and removing the solid absorbent from a mixture of the solid absorbent having absorbed the impurities and the light solution; and mixing the heavy solution with a neutralizer to neutralize the catalyst composed of alkaline material contained in the heavy solution.

Claims13

Dependent claims

A production method of a diesel fuel from a waste edible oil through the steps of:

removing solid materials contained in a waste edible oil therefrom;
heating said waste edible oil from which solid materials have been removed to 25-200.degree. C., thereby removing moisture and materials of odor contained in the waste edible oil therefrom by evaporation;
dissolving in alcohol a catalyst containing at least one or more alkaline material selected from the group consisting of potassium hydroxide, potassium carbonate and potassium alcoholate and mixtures thereof, thereby preparing an alcoholic solution containing the catalyst;
mixing said waste edible oil from which said solid materials, moisture and materials of odor have been removed with said alcoholic solution containing the catalyst and stirring the waste edible oil and alcoholic solution, thereby accelerating a catalytic reaction between the waste edible oil and the alcohol and obtaining a reaction product between the waste edible oil and the alcohol;
separating said reaction product into a light solution and a heavy solution;
mixing the light solution obtained in said separation step with a solid absorbent, thereby impurities contained in the light solution being absorbed by the solid absorbent;
and
separating and removing said solid absorbent from a mixture of the solid absorbent having absorbed the impurities and the light solution.

5 more elements

Dependencies are inferred from the claim text.