Regeneration of used cleaning solution

Details Regeneration of used cleaning solution Regeneration of used cleaning solution

C - Chemistry, Metallurgy

02

F

C02F 9/00 (2006.01) C02F 1/52 (2006.01)

Patent

CA 2161864

A method is provided for regenerating spent cleaning solutions, whether they be alkaline, acidic, or neutral. The method 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. The precipitating of the undesirable materials from the interactive solution is accomplished by adding an anionic polymeric flocculating agent and a cationic polymeric flocculating agent thereto, in the following sequence of steps, namely (i) adding either the anionic polymeric flocculating agent or the 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 cationic polymeric flocculating agent or the anionic polymeric flocculating agent, (respectively), thereby precipitating insoluble salts as large-sized and hard flocs. Finally, the solution containing the precipitated flocs is subjected to a solid/liquid separation. This regenerated solution is virtually indistinguishable from a fresh-made cleaning solution which is made from caustic and water, or acid and water.

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