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Preparation method of 1-hydroxymethyl benzotriazole

A technology for hydroxymethyl benzotriazole and benzotriazole, which is applied in the field of compound preparation, can solve the problems of inability to meet production requirements, large amount of synthetic raw materials, poor copper corrosion inhibition effect, and the like, and save synthetic raw materials. The amount of use, good corrosion inhibition effect, high production efficiency effect

Inactive Publication Date: 2014-08-20
NANTONG BOTAO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the current synthesis method, there are many problems, such as complex synthesis process, large amount of synthetic raw materials, low production efficiency, insufficient product purity, poor corrosion inhibition effect on copper, and unable to meet production needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A preparation method of 1-hydroxymethylbenzotriazole:

[0015] The specific steps are to mix 11.9g of benzotriazole, 0.5g of sulfuric acid, 100ml of water and 5g of paraformaldehyde solution, heat slowly, start stirring, keep warm at 40°C for 4 hours, and a white powdery substance is produced. Continue heating to 80°C, the precipitate is completely dissolved, keep warm for 0.5 hours, cool down, cool to room temperature, filter to obtain white needle-shaped 1-hydroxybenzotriazole crystals, and dry to obtain 15.6g of the product.

[0016] Based on the production method of this embodiment, the synthesis process is relatively simple, saves production time and the amount of synthetic raw materials used, the production efficiency is high, and the product yield is as high as 98.65%. After testing, the addition of 1-hydroxymethylbenzotriazole makes the copper The negative shift of self-corrosion potential enhances the inhibition of cathodic polarization and increases the cha...

Embodiment 2

[0018] A preparation method of 1-hydroxymethylbenzotriazole:

[0019] The specific steps are to mix 20.8g of benzotriazole, 1g of sulfuric acid, 150ml of water and 10g of paraformaldehyde solution, heat slowly, start stirring, keep warm at 50°C for 5 hours, and a white powdery substance is produced, continue Heated to 100°C, the precipitate was completely dissolved, kept warm for 1 hour, lowered the temperature, cooled to room temperature, filtered to obtain white needle-shaped 1-hydroxybenzotriazole crystals, and dried to obtain 14.9 g of the product.

[0020] Based on the production method of this embodiment, the synthesis process is relatively simple, saves production time and the amount of synthetic raw materials used, the production efficiency is high, and the product yield is as high as 99%. After testing, the addition of 1-hydroxymethylbenzotriazole makes the copper The negative shift of self-corrosion potential enhances the inhibition of cathodic polarization and incre...

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Abstract

The invention discloses a preparation method of 1-hydroxymethyl benzotriazole, which specifically comprises the following steps: mixing benzotriazole, sulfuric acid, water and a paraformaldehyde solution; slowly heating, starting stirring and carrying out heat-insulation reaction; when a white powdery substance is generated, continuously heating until the precipitate is completely dissolved; insulating heat and cooling to room temperature; filtering to obtain white needle-like 1-hydroxyl benzotriazole crystals; and drying to obtain the product. According to the preparation method of 1-hydroxymethyl benzotriazole disclosed by the invention, the synthesis process is relatively simple, the production time and the usage amount of synthesis raw materials are saved, the production efficiency is high, and the product yield is over 98.65%; the 1-hydroxymethyl benzotriazole produced by the method has a good corrosion inhibition effect on copper; and detection shows that the addition of the 1-hydroxymethyl benzotriazole enables the self-corrosion potential of copper to turn negative, the inhibition effect on cathode polarization is enhanced, the charge transfer resistance on the surface of a copper electrode is increased, and thus the corrosion inhibition effect is relatively good.

Description

technical field [0001] The invention relates to a preparation method of 1-hydroxymethylbenzotriazole, which belongs to the field of compound preparation. Background technique [0002] Because of its excellent physical and chemical properties, metal copper is widely used in the circulating water system of air-conditioning pipelines. Due to the evaporation of water during the operation of cooling towers and the continuous concentration of impurities, Clˉ, SO 4 2- The gradual increase of plasma concentration will cause corrosion to the copper pipe wall, and in severe cases, it will lead to the paralysis of the circulating water system, directly affecting industrial production and threatening people's lives. [0003] At present, the industry mostly adopts the method of adding organic corrosion inhibitors such as benzotriazole (BTA) to protect copper materials. However, when BTA is used in an acidic environment or in a low concentration of neutral water, the corrosion inhibitio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D249/18C23F11/14
CPCC07D249/18C23F11/149
Inventor 黄海波黄奎生王宏黄雪平
Owner NANTONG BOTAO CHEM
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