Methods and apparatus for controlling water hardness

Inactive Publication Date: 2010-10-21
ECOLAB USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0011]In still yet other aspects, the present invention relates to methods for reducing scale formation in an aqueous system comprising contacting the aqueous system with a compositi

Problems solved by technology

Hard water is known to reduce the efficacy of detergents, by forming films on surfaces, and reacting with detergent components making them less functional in the cleaning process.
Calcium is a divalent ion known to bind soils to surfaces, creating a film, and a making the soil more difficult to remove.
However, in many instances the water hardness exceeds the chelating capacity of the composition.
As a result, free calcium ions may be available to attack active components of the composition, to cause corrosion or precipitation, or to cause other deleterious effects, such as poor cleaning effectiveness or lime sc

Method used

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  • Methods and apparatus for controlling water hardness
  • Methods and apparatus for controlling water hardness
  • Methods and apparatus for controlling water hardness

Examples

Experimental program
Comparison scheme
Effect test

Example

Examples

[0105]The present invention is more particularly described in the following examples that are intended as illustrations only. Unless otherwise noted, all parts, percentages, and ratios reported in the following examples are on a weight basis, and all reagents used in the examples were obtained, or are available, from the chemical suppliers described below, or may be synthesized by conventional techniques.

Example

Example 1

[0106]Three 1 pound resin samples were prepared by loading them with H+, Ca++, and Mg++. The magnesium loaded sample was prepared according to the following procedure. A weak acid cation resin, Lewatit S 8528 obtained from the Lanxess Company, was soaked is 500 grams of NaOH beads and 2500 ml of softened water for 24 hours. The pH was approximately 12-13. After soaking, the resin was then rinsed thoroughly with softened water three times until the pH of the rinse water was below 11. The resin was soaked in 2500 ml of softened water with 700 grams of a MgCl2.6H20 composition for 4 days.

[0107]The resin was thoroughly rinsed with softened water three times. The final pH of the rinse water was approximately 7.5-8.5.

[0108]To load the resin with Ca++, the same procedure was used as described above for the MG++ resin, only the resin was soaked with CaCl2 composition. The H+ form of the resin, was the resin itself, without any cations loaded onto it.

[0109]Water was then treated wit...

Example

Example 2

[0112]Water with 17 grains of water hardness was treated with two pounds of Watts OneFlow media, commercially available from Watts, at a rate of about 5 gallons per minute. In addition, water with 17 grains of water hardness was treated with a magnesium loaded weak acid resin according to the present invention at the same conditions. An alkalinity source including 800 ppm of sodium carbonate was added to each of these water samples, as well as to a control sample of untreated water. The results are shown in FIG. 3. As can be seen from this Figure, both the control and the Watts treated water had a signification precipitation of water hardness. The water treated according to the present invention (shown as the right most beaker) showed no signs of a precipitate.

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Abstract

The present invention is related to methods, apparatuses, and compositions for controlling water hardness. The methods, apparatuses and compositions also reduce scale formation. The present invention includes substantially water insoluble resin materials. The resin materials may be loaded with a plurality of cations.

Description

RELATED APPLICATIONS[0001]This application claims priority and is related to U.S. Provisional Application Ser. No. 61 / 261,610 filed on Nov. 16, 2009 and entitled “Methods and Apparatus for Controlling Water Hardness.” The entire contents of this patent application are hereby expressly incorporated herein by reference including, without limitation, the specification, claims, and abstract, as well as any figures, tables, or drawings thereof.[0002]This application also claims priority and is related to U.S. Provisional Application Ser. No. 61 / 171,145 filed on Apr. 21, 2009 and entitled “Catalytic Water Treatment Method and Apparatus.” The entire contents of this patent application are hereby expressly incorporated herein by reference including, without limitation, the specification, claims, and abstract, as well as any figures, tables, or drawings thereof.[0003]This application is also related to U.S. patent application Ser. No. ______ (Attorney Docket Number 2580USU1), entitled “Catal...

Claims

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Application Information

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IPC IPC(8): C02F1/42C02F1/02B08B3/04C02F5/10
CPCC02F1/42C02F1/5236E03B7/074C02F2201/006C02F1/725C02F2001/425C02F5/02C02F5/10C02F2303/22
Inventor MONSRUD, LEE J.SUN, XINMILLS, KRISTEN A.PRIDEAUX, DOUGLAS J.BENSON, BETH E.SMITH, KIM R.OLSON, KEITH E.
Owner ECOLAB USA INC
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