US 2010/0140181 A1 · REGENERATION OF USED CLEANING SOLUTION

Abstract

A process is provided for improving the precipitation of calcium and/or magnesium salts in the regeneration of used alkaline cleaning solution. The process includes the steps of providing a spent alkaline or acidic cleaning solution; adding sodium bentonite and sodium carbonate to the spent alkaline or acidic cleaning solution in a mixing zone to provide an interactive solution; adding either an anionic polymeric flocculating agent or a cationic polymeric flocculating agent to interactive solution, thereby precipitating insoluble calcium and magnesium salts as flocs; and subjecting the solution containing such flocs to a filtration process to bring the precipitated solids to a solids contents of >25%.

Claims17

Dependent claims

A process for improving the precipitation of calcium and/or magnesium salts in the regeneration of used alkaline or acidic cleaning solution comprising the steps of:

(a) providing alkaline or acidic cleaning solution;
(b) adding a thoroughly-mixed aqueous slurry of sodium bentonite and sodium carbonate to the raw, untreated spent alkaline or acidic cleaning solution to provide an interactive solution;
(c) adding either an anionic polymeric flocculating agent or a cationic polymeric flocculating agent to said interactive solution, thereby precipitating insoluble calcium and magnesium salts as flocs and simultaneously providing a reactive solution;
and (d) subjecting the reactive solution containing such floes to a filtration process to bring the precipitated solids to a solids content of >25%.

1 more element

A spent cleaning solution regeneration system comprising:

(a) a spent cleaning solution holding tank;
(b) a mixing tank;
(c) a main conduit from said spent cleaning solution holding tank to said mixing tank;
(d) a primary reagent tank;
(e) a primary conduit from said primary reagent tank to said mixing tank;
(f) a secondary reagent tank;
(g) a secondary conduit from said secondary reagent tank to said mixing tank;
(h) a balance tank;
(i) an outflow conduit from said mixing tank to said balance tank;
(j) a filter system;
(k) a filter conduit from said buffer tank to an inlet to said filter system;
(l) a regenerated spent cleaning solution tank;
and
(m) a conduit from an outlet from said filter system to said regenerated spent cleaning solution tank.

11 more elements

Dependencies are inferred from the claim text.

Regeneration of used cleaning solution

Life of this patent

Regeneration of used cleaning solution

Life of this patent

Abstract

Claims17