Regeneration of used cleaning solution

Details Regeneration of used cleaning solution Regeneration of used cleaning solution

1994-10-18

1996-04-23

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210669, C02F 900

Patent

active

055100376

ABSTRACT:
A process for regenerating spent cleaning solutions. The process involves the sequential steps of first preconditioning the spent solution. Then, an absorbent material is added to the preconditioned solution to provide an interactive solution. Suitable precipitation agents are added to the interactive solution to precipitate undesirable materials from the solution. The precipitating of the undesirable materials from the interactive solution is accomplished by adding an anionic and a cationic polymeric flocculating agent thereto, in the sequence of steps (i) adding one of the anionic or cationic polymeric flocculating agent to the interactive solution to provide a reactive solution, (ii) thoroughly mixing the reactive solution, and (iii) adding the other of the anionic or cationic flocculating agent, thereby precipitating insoluble salts as flocs. Finally, the solution containing the precipitated flocs is subjected to a solid/liquid separation.

REFERENCES:
patent: 4655934 (1987-04-01), Rose et al.
patent: 4783265 (1988-11-01), Timmons

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