Process for removing oils and greases from aqueous solution

Details Process for removing oils and greases from aqueous solution Process for removing oils and greases from aqueous solution

1994-03-28

1995-10-31

McCarthy, Neil

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210717, 210719, 210720, 210721, 210722, 210912, 210913, 210914, 210724, 75712, 75714, 75739, 204DIG13, C02F 162, C02F 170

Patent

active

054626706

ABSTRACT:
A process for removing dissolved oils and greases from an aqueous solution which also may contain dissolved heavy metals is provided wherein the aqueous solution is mixed with a source of ferrous ion and dithionite ion in a first step at acidic pH to reduce and permit removal of solid heavy metal, is present and to separate oils and greases from the aqueous solution. Solution from the first step if reacted in a second step with hydroxide slurries obtained from third and fourth steps. A second step solution from the second step is reacted in a third step with an alkali composition and a third solution. Optionally, the third solution is reacted with a chelating agent for iron and an oxidizer in a fourth step. A solution of chelated iron from the fourth step, when practical is disposed of. Oils and greases are recovered from the first step such as by skimming.

REFERENCES:
patent: 1479542 (1924-01-01), Hirschkind
patent: 3216790 (1965-11-01), Murib
patent: 3226185 (1965-12-01), Gyan et al.
patent: 3260593 (1966-07-01), Zimmerley et al.
patent: 3634071 (1972-01-01), Spedden et al.
patent: 3770630 (1973-11-01), Kamperman
patent: 3902896 (1975-09-01), Borbely et al.
patent: 4076795 (1978-02-01), Tiethof
patent: 4157980 (1979-06-01), Tiethof
patent: 4599177 (1986-07-01), Hayashi et al.
patent: 4698162 (1987-10-01), Guilbault et al.
patent: 4859447 (1989-08-01), Sanglet
patent: 5039428 (1991-08-01), Wentzler
patent: 5102556 (1992-04-01), Wong
patent: 5122279 (1992-06-01), Guess
patent: 5298168 (1994-03-01), Guess

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