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Composition and method for inhibiting corrosion and scale

A technology for inhibiting corrosion and treating compositions, applied in the directions of chemical instruments and methods, descaling and water softening, special treatment targets, etc., can solve the problem of not obtaining substantial improvement in scale inhibition effect, etc.

Pending Publication Date: 2020-04-21
NCH CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The scale formation results demonstrated in the '023 patent based on the use of polyaspartic acid and PBTC were about the same as those obtained with PBTC alone, indicating that scale inhibition was not achieved with the two-component formulation of the '023 patent. substantive improvement

Method used

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  • Composition and method for inhibiting corrosion and scale
  • Composition and method for inhibiting corrosion and scale
  • Composition and method for inhibiting corrosion and scale

Examples

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Embodiment approach

[0053] Compositions according to preferred embodiments of the invention comprise organophosphates from HPA and from the other phosphonic acid (HEDP) used in these examples. In the presence of biocides, organophosphates are often reduced to orthophosphates, which is less than ideal in preventing corrosion or scaling, and can also cause problems with the formation of calcium phosphate scales. According to a preferred embodiment of the present invention, when a combination of AAP, HPA and HEDP (or another phosphonic acid) is used as a corrosion inhibitor, virtually no reduction of the organophosphate to orthophosphate is detected. Samples from Composition Examples 2 and 3 and Comparative Example 7 were tested for the presence of orthophosphate while the compositions were mixing and after an additional 48 hours. The results are listed in Table 5 below. Examples 2 and 3 using AAP, HPA and HEDP (and containing AA / AMPS and TTA as described above) showed very little increase in ortho...

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Abstract

A composition and a method of inhibiting corrosion, white rust, and scale formation on components in a water system. The composition preferably comprises an amino-acid based polymer (most preferably apotyaspartic acid or a salt thereof), hydroxyphosphonoacetic acid, and a second phosphonic acid (preferably a phosphonocarboxylic acid), and does not require the use of regulated metals. The composition is effective even in the presence of biocides. A preferred method of inhibiting white rust comprises adding an amino-acid based polymer or hydroxyphosphonoacetic acid or both to the water system.A preferred method of inhibiting corrosion, white rust, and scale formation comprises adding an amino-acid based polymer, hydroxyphosphonoacetic acid, and a phosphonocarboxylic acid to the water system. Preferably the active concentrations are at least 3 ppm each of the amino-acid based polymer and hydroxyphosphonoacetic acid when added to a volume of water in the water system.

Description

[0001] Citations to related applications [0002] This application claims priority to U.S. Application No. 15 / 634,416, filed June 27, 2017. technical field [0003] The present invention relates to treatment compositions and methods for inhibiting corrosion or white rust on metal components in low LSI (Langelier Saturation Index) water systems and for inhibiting scale formation in high LSI water systems. Background technique [0004] Various water treatment compositions are used to reduce corrosion, mineral scale and white rust formation on metal components in contact with aqueous solutions in water systems such as open recirculation systems, closed loop cooling or heating systems, cooling towers and boilers, and to help Protect the metal components of these systems. Metals commonly used in these water systems include ferrous metals including galvanized steel, aluminum and its alloys, copper and its alloys, lead and solder. Many known corrosion inhibitors contain regulated...

Claims

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Application Information

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IPC IPC(8): C02F5/12C02F5/14C23F11/04
CPCC02F5/12C02F5/14C23F11/10C23F14/02C02F1/50C23F11/1676C23F11/173C02F2303/08C02F2303/22
Inventor 马尔塔·德雷夫尼亚克莱尔·H·施泰梅尔
Owner NCH CORP