PURPOSE: To attain effective utilization of resources and obtain a regenerated oil with a high utility value, by a process comprising simultaneously adding phosphoric acid and a particular anionic surfactant or a nonionic surfactant to waste oil, blending, neutralizing, adding a cationic polymer coagulant and performing solid-liq. separation.
CONSTITUTION: 0.5-1.0 part of phosphoric acid (B) and 0.1-1.0 part of surfactant (C) selected from a member (a) selected from anionic surfactants of the formulae I-III (wherein each of R1R3 is a 7-20 C alkyl, M1 is H or M2, M2 is Na, K, Ca or NH4; and n is 6-20) and a nonionic surfactant (b) of the formula IV (wherein R4 is R1; p is 1 or 2; and m is n) are simultaneously added to 100 pts. waste oil (A), and they are blended with each other. Subsequently, an alkali compd. (e.g., NaOH) (D) and water are added, and blended at 80-90°C for at least 30min. to effect neutralization. Thereafter, 0.05-0.2 part of a cationic polymer coagulant (e.g., an epichlorohydrin condensation product of a polyamide from diethanolamine and adipic acid) is added. Finally, solid-liq. separation is performed by filtration, centrifugation, etc., to recover in a high yield of 80-90% a regenerated oil with a low ash content.
INADA SACHIKO
YAMAGUCHI KEN
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