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Corrosion inhibitor and method of inhibiting corrosion

A technology of corrosion inhibitors and surfactants, applied in the field of corrosion inhibitors, can solve the problems of thickening, insufficient long-term storage stability, and large discharge of washing waste liquid, and achieve the effect of reducing the discharge of waste liquid

Inactive Publication Date: 2009-09-09
KURITA WATER INDUSTRIES LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This two-step production method requires multiple reactors and other equipment, and there is a problem that the amount of waste washing liquid after production is also large, and the waste washing liquid contains COD such as fatty acids, which poses a problem of burdening the environment.
[0009] Moreover, even these improved water-based emulsions have insufficient long-term storage stability, especially in high-temperature environments, which tend to gel (viscosify), and require high-viscosity pumps for actual use.

Method used

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  • Corrosion inhibitor and method of inhibiting corrosion
  • Corrosion inhibitor and method of inhibiting corrosion
  • Corrosion inhibitor and method of inhibiting corrosion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0043] Embodiment 1~5, comparative example 1, 2

[0044] [Preparation of Corrosion Inhibitors]

[0045] Add ingredients (A) to (C) or other ingredients into the production kettle according to the ratio shown in Table 1, heat and stir at 60-70°C to dissolve them evenly. Then, the amount of water shown in Table 1 was poured in, and the production kettle was kept at 45 to 50° C. and stirred for 3 to 4 hours. Then, it was slowly cooled to room temperature while stirring.

[0046] 【Table 1】

[0047] Proportion (weight)

[0048]

[0049] *Polyoxyethylene (20) sorbitan monooleate

[0050] [evaluation of storage stability]

[0051] The medicaments prepared in each example were kept statically in a constant temperature tank at 25°C or 45°C, and were taken out in due course to investigate the change of viscosity with time. The results are shown in Table 2.

[0052] 【Table 2】

[0053] Storage stability evaluation results (viscosity: cps)

[0054]

[0055] As can be seen fro...

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Abstract

A corrosion inhibitor which combines a film-forming function with a neutralizing function, can be stably stored for long even in a high-temperature environment, and can be easily produced in one batch. The corrosion inhibitor comprises ingredients respectively in the following groups (A) to (C): (A) C10-22 aliphatic amines; (B) surfactants comprising a polyethylene glycol / fatty acid ester; and (C) one or more water-soluble amines selected from the group consisting of 2-amino-2-methylpropanol, morpholine, and monoisopropanolamine.

Description

technical field [0001] The present invention relates to a corrosion inhibitor for suppressing corrosion of metals used in heat exchangers and pipes of a boiler steam return system, and particularly to a corrosion inhibitor excellent in long-term storage stability in a high-temperature environment. In addition, the present invention also relates to a method of inhibiting corrosion using the corrosion agent. Background technique [0002] In steam generating systems such as boilers, the pH drops due to dissolved oxygen, bicarbonate ions, or carbon dioxide in the feed water cause corrosion of metals such as heat exchangers and piping that make up steam or return water systems. In order to suppress this corrosion, the method using a chemical|medical agent is especially widely practiced. [0003] The agent is mainly a coating agent that prevents water vapor or return water containing corrosive factors such as oxygen or carbon dioxide from directly contacting the metal surface, an...

Claims

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Application Information

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IPC IPC(8): C23F11/14
CPCC23F11/149C23F11/142C23F11/141C23F11/10
Inventor 内田和义志村幸祐佐藤耕一五藤培雄
Owner KURITA WATER INDUSTRIES LTD
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