Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Reexamination Certificate
1999-04-20
2001-10-23
Metzmaier, Daniel S. (Department: 1712)
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
C210S717000, C210S728000, C210S912000, C210S917000, C210S928000, C210S930000, C252S060000, C252S175000, C252S181000, C423S300000, C423S306000, C524S401000, C524S414000, C524S435000, C524S436000, C524S437000
Reexamination Certificate
active
06306308
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to coagulants for water treatment applications. In general, coagulants are utilized to remove suspended solid particles from aqueous systems.
Coagulants typically fall into the general category of inorganic (trivalent, divalent metal salts) or organic (water soluble polyelectrolytes). Examples of widely used inorganic coagulants are aluminum sulfate Al
2
(SO
4
)
3
, aluminum chloride AlCl
3
, aluminum chlorohydrate Al
2
(OH)
5
Cl, ferric chloride FeCl
3
, ferric sulfate Fe
2
(So
4
)
3
, and calcium chloride. Examples of commonly used water soluble or solution polyelectrolytes are p-DMDAAC (polydimethyl diallyl ammonium chloride) and Epi-DMA polyamine Epichlorohydrin-dimethylamine).
Many inorganic coagulants are compatible with solution cationic polyelectrolytes and can be combined to form stable combinations. In recent years, many different blend formulations of an inorganic coagulant with a high charge solution cationic polyelectrolyte have been patented and marketed. An example of an inorganic coagulant/polymer blend might be: 5 parts of a standard 280 Baumé AlCl
3
solution mixed with 1 part of Epi-DMA polyamine. More examples, limits, and ranges are explained in U.S. Pat. Nos. 4,746,457, 4,900,019, and 5,035,808 to Calgon Corporation, and further in U.S. Pat. Nos. 2,862,880, 3,285,849, 3,472,767, 3,489,681, 3,617,569, 4,137,165, 4,450,092, 4,582,627, 4,610,801, and 4,655,934, the disclosures of which are incorporated herein by reference in their entirety. Normally, these compositions are physical blends of an inorganic trivalent metal salt solution and a water soluble polymer solution, which is a simple mixture of the components where both components retain their original identity or chemical composition, but provide utility and advantages such as:
1. a synergy of adding the inorganic and polymeric coagulants simultaneously as a blend; and
2. ease of use—using one product instead of two (thereby eliminating feed systems, equipment, and handling).
Wastewater treatment systems typically require the use of trivalent metal salts, a polymer or a combination of both in the coagulation process. Both ferric coagulants such as FeCl
3
blends and aluminum coagulants such as alum or Al
2
(OH)
5
Cl blends are often used for these processes. Both the ferric and aluminum coagulants provide different desirable properties. However, these coagulants are normally incompatible with each other.
It was thus desired in the art to develop a single coagulant which would combine the desirable properties of ferric and aluminum coagulants.
SUMMARY OF THE INVENTION
The present invention comprises a composition that is the reaction product of a trivalent metal salt, excluding chromium salts, an acid phosphorous compound and an aluminum hydroxy chloride, and a process for preparing the same.
The method of use according to the present invention comprises adding this reaction product in an effective amount to the solution to be treated. The composition of the present invention is an excellent and unique coagulant for most water treatment applications.
As used herein, the phrase “effective amount” refers to that amount of the claimed reaction product which is helpful to at least partially treat (Coagulate) the impurities in the wastewater or system being treated.
REFERENCES:
patent: 2550490 (1951-04-01), McDonald
patent: 3544476 (1970-12-01), Aiba et al.
patent: 3929666 (1975-12-01), Aiba et al.
patent: 4316810 (1982-02-01), Burnham
patent: 4362643 (1982-12-01), Kuo et al.
patent: 4507213 (1985-03-01), Daccord et al.
patent: 4566986 (1986-01-01), Waldmann
patent: 4582627 (1986-04-01), Carlsson
patent: 4655934 (1987-04-01), Rose et al.
patent: 4683217 (1987-07-01), Lok et al.
patent: 4746457 (1988-03-01), Hassick et al.
patent: 4800039 (1989-01-01), Hassick et al.
patent: 4902779 (1990-02-01), Waldmann
patent: 5035808 (1991-07-01), Hassick et al.
Fair, et al. “Water and Wastewarter Engineering Vol. 2: Water Purification and Wastewater Disposal”, pp. 30-10 to 0-15, Wiley, New York, 1968 Month unknown.
T.H.Y. Tebbut “Principles of Water Quality Control. 2ndEd.”, pp. 100-108, Pergamon Press, Oxford, England, 1977 Month unknown.
Charles R. O'Melia, Ph.D., “Water Treatment Plant Design for the Practicing Engineer”, Robert L. Sanks, Editor, Chapter 4, pp. 65-76, Ann Arbor Science, Ann Arbor, Michigan, 1978 Month unknown.
Rip G. Rice, Ph.D. “Safe Drinking Water; The Impact of Chemicals on a Limited Resource”, pp. 22-23, Monograph, Drinking Water Res. Found., Alexandria, Va., 1985 Month unknown.
James M. Montgomery, “Water Treatment Principles and Design”, Consulting Engineers, Inc., pp. 122-23; John Wiley and Sons, New York, N. Y. 1985 Month unknown.
Robert B. Williams and Gordon L. Culp “Handbook of Public Water Systems”, pp. 46-52, Van Nostrand Reinhold Co., New York, N.Y., 1986 Month unknown.
Drink Water Health Effects Task Force, “Health Effects of Drinking Water Treatment Technologies”, pp. 83-85, Lewis Publisher, Inc., Chelsea, MI, 1989 Month unknown.
American Water Works Assoc., “Water Quality and Treatment: A Handbook of Community Water Supplies. 4thEd.” pp. 285-292, McGraw-Hill, New York, N.Y., 1990 Month unknown.
Dempsey et al., Polyaluminum Chloride and Alum Coagulation of Clay—Fulvic Acid Suspensions, Joun, AWWA, pp. 74-80, (Mar. 1965).
“Poly Aluminum Hydroxide Salts—Maximizing Performance Through Poly Aluminum Chemistry”, World Water & Environmental Engineering—Sep. 1997.
David A. Mortimer, “Synthetic Polyelectrolytes—A Review”, Polymer International, pp. 29-41, 1991 Month unknown.
Dotter Pamela J.
Flaherty Michael P.
Guerrini Robert J.
Hassick Denis E.
Metzmaier Daniel S.
Nalco Chemical Company
Webb Ziesenheim & Logsdon Orkin & Hanson, P.C.
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