Process for recycling paint flush solution

Details Process for recycling paint flush solution Process for recycling paint flush solution

2008-03-04

2008-03-04

Drodge, Joseph (Department: 1723)

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

C118S603000, C134S010000, C134S013000, C210S709000, C210S712000, C210S723000, C210S724000, C210S735000, C210S805000, C210S806000

Reexamination Certificate

active

10285632

ABSTRACT:
A process for removing solids from a water-based flush solution, The process includes: providing dirty flush solution; directing the dirty flush solution to a treatment vessel; adding one or more chemicals to the treatment vessel to form a treated flush solution; separating aggregated paint compounds from the treated flush solution to form a filtered flush solution; and directing the filtered flush solution to spray application equipment. The flush system of the invention includes a treatment vessel, wherein the dirty flush solution is mixed with one or more chemicals to form a treated flush solution; a primary separation unit to remove particles including aggregated paint compounds from the treated flush solution to form a filtered flush solution; and transfer lines to direct the filtered flush solution to spray application equipment. The filtered flush solution contains: 1% to 5% by weight of a water soluble organic solvent; 0.08% to 2% by weight of an alkaline agent selected from an amine or an alkanolamine; 0.2% to 1.5% by weight of polypropylene glycol; 0.3% to 2.5% by weight of alkoxyethanol; and water.

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