Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1988-09-09
1990-08-07
Lieberman, Paul
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210767, 210758, 210759, B01D 1300
Patent
active
049465953
ABSTRACT:
A process for physically and chemically treating a used engine coolant containing one or more glycol and/or alcohol-based antifreeze components. The process includes the steps of oxidation with one or more known oxidizing agents, precipitation with one or more known salt forming agents and filtration through any suitable filtration membrane or other separation means.
A chemical additive has been developed for use in carrying out the process of the present invention which initiates and maximizes the amount of oxidation and precipitation occurring within the coolant composition, adds one or more suitable corrosion inhibitors and one or more known buffering agents in a sufficient amount to adjust the pH of the final solution to between about 9.5 and 10.5.
An apparatus for use in accordance with the process of the present invention for recycling the engine coolant is also described herein.
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Conley, J. H. and Jamison, R. G., "Additive Package for Used Antifreeze," Engine Coolant Testing Second Symposium, ASTM STP 887, Roy E. Beal, Ed., American Society for Testing and Materials, Philadelphia, 1986, pp. 78-85, (only pp. 78-79 are included here).
Clifton, J. R., Rossiter, W. J. Jr., Brown, P. W., "Degraded Aqueous Glycol Solutions: pH Values and the Effects of Common Ions on Suppressing pH Decreases", Solar Energy Materials 12, North-Holland, Amsterdam, 1985, pp. 77-86.
Brochure, FPPF 4000 "Cooling System Treatment", Buffalo, N.Y., FPCT-6/87, 4 pages.
American Society for Testing and Standards, "Standard Method for Corrosion Test for Engine Coolants in Glassware", American National Standard ANSI/ASTM D 1384-70, (Reapproved 1975), Annual Book of ASTM Standards, Philadelphia, PA, pp. 34-42.
Bean Jr. Edwin T.
FPPF Chemical Corporation Inc.
Lieberman Paul
Linihan Martin G.
McNally John F.
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