A METHOF OF REPRODUCTION OF WASTE OIL AND AN APPARATUS USED THEREFOR

摘要

The present invention relates to a method of reproduction of waste oil and an apparatus for reproducing waste oil such as waste cooking oil or animal fat into fuel for diesel engines or boilers. The method of reproduction of waste oil includes the steps of: adding an absorbent into the waste oil from which dregs are removed at the temperature of 50 &tilde& 80 DEG C, stirring the waste oil for 20 &tilde& 40 minutes while applying ultrasonic impact energy to the waste oil, and removing the absorbent cohered with oxidized substances, water and other contracted materials using a high-performance centrifugal separator and a filter; adding potassium hydroxide-methanol solution, which is made by melting potassium hydroxide in methanol, into the refined waste oil, and stirring in the temperature of 50 &tilde& 80 DEG C for 30 &tilde& 65 minutes to cause methyl-esterification reaction, separating and removing glycerol from the methyl-esterified reaction solution to collect light oil; adding and mixing a predetermined amount of water into the collected oil; adding and neutralizing a small amount of 3N phosphoric acid (H3PO4) solution and magnesium silicate in the mixture, and removing salt and other oxidized products through the centrifugal separator of high function and the filter; and applying ultrasonic wave impact energy to the neutralized oil, emulsifying oil through cavitation phenomenon and obtaining fatty acid methyl-ester of an emulsified state without phase-separation.