Preparation method for color-changing scale washing agent

A cleaning agent and scale technology, which is applied in the field of preparation of discoloration scale cleaning agent, can solve the problems of environmental pollution and strong corrosion, and achieve the effect of less corrosion of equipment, strong cleaning ability and simple operation

Inactive Publication Date: 2019-04-05
SHANGHAI INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the descaling agents used in the chemical cleaning method are mainly inorganic strong acids, and the traditional inorganic strong acid cleaning agents have the disadvantages of strong corrosion and environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Preparation of hydrochloric acid, ammonium chloride, disodium edetate, and benzotriazole form a mixed solution, wherein the mass concentration of hydrochloric acid is 7%, the mass concentration of ammonium chloride is 1.2%, and ethylenediamine The mass concentration of disodium tetraacetate is 0.02%, and the mass concentration of benzotriazole is 0.01%;

[0018] (2) Prepare a neutral red-methylene blue mixed solution, which is composed of 0.1% neutral red ethanol solution and 0.1% methylene blue ethanol solution in a ratio of 1:1 by volume;

[0019] (3) Mix the solution obtained in step (1) with the solution obtained in step (2) at a volume ratio of 10000:6, and the resulting mixed solution is the discoloration scale cleaning agent.

[0020] This cleaning agent reacts with calcium carbonate, until the cleaning agent changes from purple to gray-green, the amount of calcium carbonate dissolved in the cleaning agent is measured to be 100g / L. The sustained release rate...

Embodiment 2

[0022] (1) Preparation of hydrochloric acid, ammonium chloride, EDTA disodium salt, and benzotriazole form a mixed solution, wherein the mass concentration of hydrochloric acid is 8%, the mass concentration of ammonium chloride is 1.2%, and ethylenediamine The mass concentration of disodium tetraacetate is 0.02%, and the mass concentration of benzotriazole is 0.01%;

[0023] (2) Prepare a neutral red-methylene blue mixed solution, which is composed of 0.1% neutral red ethanol solution and 0.1% methylene blue ethanol solution in a ratio of 1:1 by volume;

[0024] (3) Mix the solution obtained in step (1) with the solution obtained in step (2) at a volume ratio of 10000:6, and the resulting mixed solution is the discoloration scale cleaning agent.

[0025] This cleaning agent reacts with calcium carbonate, until the cleaning agent turns gray-green from purple, the amount of cleaning agent dissolving calcium carbonate recorded is 120g / L. The sustained release rate of the cleanin...

Embodiment 3

[0027] (1) Preparation of hydrochloric acid, ammonium chloride, disodium edetate, and benzotriazole form a mixed solution, wherein the mass concentration of hydrochloric acid is 7%, the mass concentration of ammonium chloride is 1.5%, and ethylenediamine The mass concentration of disodium tetraacetate is 0.02%, and the mass concentration of benzotriazole is 0.01%;

[0028] (2) Prepare a neutral red-methylene blue mixed solution, which is composed of 0.1% neutral red ethanol solution and 0.1% methylene blue ethanol solution in a ratio of 1:1 by volume;

[0029] (3) Mix the solution obtained in step (1) with the solution obtained in step (2) at a volume ratio of 10000:6, and the resulting mixed solution is the discoloration scale cleaning agent.

[0030] This cleaning agent reacts with calcium carbonate, until the cleaning agent changes from purple to gray-green, the amount of calcium carbonate dissolved in the cleaning agent is measured to be 100g / L. The sustained release rate...

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PUM

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Abstract

The invention relates to a preparation method for a color-changing scale washing agent. The preparation method comprises the following steps: 1) forming mixed solution by hydrochloric acid, ammonia chloride, ethylenediamine tetraacetic acid disodium salt, and benzotriazole, wherein mass concentration of the hydrochloric acid is 7-8%, mass concentration of the ammonia chloride is 1.1-1.6%, mass concentration of the ethylenediamine tetraacetic acid disodium salt is 0.02-0.04%, and mass concentration of the benzotriazole is 0.01-0.02%; 2) mixing 0.1% of ethanol solution of neutral red and 0.1% ofethanol solution of methylene blue according to a volume ratio of 1:1, and forming neutral red-methylene blue mixed solution; and 3) enabling the mixed solution obtained in the step 1) to be mixed with the neutral red-methylene blue mixed solution obtained in the step 2), wherein obtained mixed solution is the color-changing scale washing agent. Compared with the prior art, the washing agent hasthe advantages of small corrosion to equipment, strong cleaning capacity, safety and non-pollution, failure indication through color-changing and the like.

Description

[technical field] [0001] The invention belongs to the field of industrial water treatment, in particular to a preparation method of a discoloration scale cleaning agent used for removing scale from boilers, cooling towers and circulating water pipes. [Background technique] [0002] Due to the presence of calcium and magnesium ions and other impurities in tap water, after a long period of use, a relatively thick layer of scale will form on the inner surface of metal devices or pipelines. Especially in some areas with relatively high water hardness, the concentration of calcium and magnesium ions will be higher. Scale has a very serious impact on industrial production, especially the pipelines, boilers and heat exchangers that transport water. Scale will hinder heat conduction and reduce thermal efficiency. It is greatly reduced and also affects the quality of distilled water produced. At the same time, the existence of a large amount of scale may also cause local overheating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11D7/08C11D7/10C11D7/32C11D7/26C11D7/60C11D3/40
CPCC11D3/40C11D7/08C11D7/10C11D7/261C11D7/3245C11D7/3281
Inventor 王根礼
Owner SHANGHAI INST OF TECH
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