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

  • US 5,972,057 A
  • Filed: 09/03/1998
  • Issued: 10/26/1999
  • Est. Priority Date: 11/11/1997
  • Status: Expired due to Term
First Claim
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1. 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°

    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.

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