Treatment of recycled ammonium sulfate-bisulfate solution

Mineral oils: processes and products – Refining – Purifying used oil

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Details

208251R, 208289, 423517, 423545, 423549, C01C 1242, C10M 1100

Patent

active

042241421

ABSTRACT:
Ammonium sulfate-bisulfate solution contaminated with metal and other ash producing contaminants is treated by adjusting the pH of the solution to the range that produces a precipitate of the contaminant by the addition of ammonia or ammonium hydroxide; cooled to at least the temperature at which a precipitate is produced; removing the precipitate from the solution; the pH of the solution from which the precipitate has been removed is adjusted to the range at which precipitation is substantially completed by the addition of sulfuric acid; and the SO.sub.4.sup.= ion concentration and the NH.sub.4.sup.+ ion concentration of the solution are adjusted to the range of the solution before initial circulation to produce a solution in which the metal concentration has been sufficiently reduced to permit recycle for use in reclaiming used motor oils.

REFERENCES:
patent: 3169917 (1965-02-01), Kahan
patent: 3294678 (1966-12-01), Gleim
patent: 3791965 (1974-02-01), Fitzsimons et al.
patent: 3879282 (1975-04-01), Johnson
patent: 3930988 (1976-01-01), Johnson

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