# US 10,308,531 B2 · Composition and processfor removing impurities from a circulating water system

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- Number: US 10,308,531 B2
- Document ID: US10308531B2
- Status: Granted
- Kind: B2
- Application number: 14/284,522
- Filed: 2014-05-22
- Published: 2014-09-11
- Granted: 2019-06-04
- Earliest claimed: 2009-06-24
- Assignees: Ecolab USA Inc.
- Applicants: Ecolab USA Inc.
- Inventors: Joseph P. Miknevich; David W. Scheimann
- Web page: https://patentgrep.com/patent/US10308531B2

## CPC

- C02F 1/5245: {using basic salts, e.g. of aluminium and iron}
- C02F 1/52: by flocculation or precipitation of suspended impurities {(C02F1/463 takes precedence)}
- C02F 1/5263: {using natural chemical compounds}
- C02F 1/5272: {using specific organic precipitants}
- C02F 1/54: using organic material
- C02F 1/56: Macromolecular compounds
- C08L 1/02: Cellulose; Modified cellulose
- C08L 3/04: Starch derivatives {, e.g. crosslinked derivatives}
- B05B 14/468: with scrubbing means arranged below the booth floor
- B08B 3/14: Removing waste, e.g. labels, from cleaning liquid
- C02F 1/001: {Processes for the treatment of water whereby the filtration technique is of importance (C02F1/44 takes precedence; construction of filters in general B01D24/00 - B01D41/00)}
- C02F 1/38: by centrifugal separation
- C02F 1/66: by neutralisation; pH adjustment (for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58)
- C02F 2103/14: Paint wastes
- C02F 2209/06: pH
- C08L 3/08: Ethers
- C11D 3/046: {Salts}
- C11D 3/3719: {Polyamides or polyimides}
- Y02P 70/10: Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D)
- B08B: CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The invention provides methods and compositions for a composition and/or a method for treating impurities in a circulating water system. The circulating water system impurities may be oversprayed paint in paint spray booth applications. The composition includes an aqueous solution of a cationized starch, a polybasic aluminum salt such as aluminum chlorohydrate or polyaluminum chloride and a solution of a medium to high MW aqueous flocculant. The composition is particularly useful when added to recirculating scrubber water in paint spray booths for effectively treating both water based and solvent based paints.

## Claims

### Claim 1

A composition for addition to a circulating water system containing an impurity, the composition consisting of: a cationized corn starch, water, and a polybasic metal salt, wherein the cationized corn starch comprises a quaternary amine, wherein the quaternary amine is —N+(CH3)3Cl−, and the composition does not include a polyacrylamide polymer.

### Claim 2 (depends on 1)

The composition of claim 1, wherein the composition comprises 1 to 35% by weight cationized corn starch.

### Claim 3 (depends on 1)

The composition of claim 1, wherein the composition comprises 35 to 55% by weight of the cationized corn starch and 45 to 65% by weight of the polybasic metal salt.

### Claim 4 (depends on 1)

The composition of claim 1, wherein the cationized corn starch has a degree of substitution of between 0.01 to 1.0.

### Claim 5 (depends on 1)

The composition of claim 1, wherein the composition is a liquid concentrate.

### Claim 6 (depends on 1)

The composition of claim 1, wherein the polybasic metal salt is an amphoteric salt of aluminum.

### Claim 7 (depends on 6)

The composition of claim 6, wherein the amphoteric salt of aluminum is selected from the group consisting of: polyaluminum chloride, polyaluminum silicate sulfate, polyaluminum nitrate, polyaluminum hydroxychlorosulfate, poly aluminum nitrate sulfate, aluminum chlorohydrate, and any combination thereof.

### Claim 8 (depends on 1)

A method of removing impurities from a circulating water system comprising:
adding the composition of claim 1 to the circulating water system, the circulating water system comprising oversprayed paint particles;
adding a polymer solution having at least 0.1% of hydroxyl functionality;
flocculating the oversprayed paint particles; and
separating the oversprayed paint particles from water in the circulating water system.

### Claim 9 (depends on 8)

The method of claim 8, wherein a water stream of the circulating water system has a pH from 6.0 to 10.0.