Method for producing 5-methyl benzotriazole

A technology of tolyltriazole and its production method is applied in the field of manufacture of tolyltriazole, which can solve the problem of difficulty in producing high-purity 5-methylbenzotriazole, difficulty in adapting to high-precision, High stability requirements and other issues, to achieve the effect of easy organization of industrial production, easy control of the preparation process, and high yield

Inactive Publication Date: 2007-06-13
黄奎生
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Existing production methods are difficult to produce high-purity 5-methylbenzotriazole, generally only the mixture of 4-methylbenzotri...

Method used

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  • Method for producing 5-methyl benzotriazole
  • Method for producing 5-methyl benzotriazole
  • Method for producing 5-methyl benzotriazole

Examples

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Embodiment Construction

[0024] A kind of production method of 5-methylbenzotriazole of the present embodiment comprises the following steps:

[0025] 1. Add 700kg of pure water to the reaction kettle. The pure water refers to distilled water or deionized water. The pure water in this embodiment is deionized water; 4 Add diaminotoluene into the reaction kettle, and stir, keep the temperature of 95-105°C, dissolve for 30 hours, and make it fully dissolved; the reaction temperature is controlled by the circulating water of the medium pressure coil;

[0026] 2. Add 380kg of sodium nitrite to the reaction kettle solution formed in step 1, and stir for 3 hours; the reaction pressure is kept at 5.6MPa, and the temperature is kept at 280°C; the reaction formula is:

[0027]

[0028] 3. Cool the solution formed in step 2 to a temperature of 180°C and reduce the pressure to 0.7MPa;

[0029] 4, drip the sulfuric acid of 13% (w / w) in the solution formed in step 3, keep pH value 5, a large amount of crystals ...

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Abstract

This invention relates to a production method of 5-methyl benzotriazole. Its characteristic is that it includes following steps: (1)in reaction kettle, put 3,4 diaminotoluene in purified water, heat to dissolve; (2)add sodium nitrite of 3,4 diaminotoluene in the solution that is produced by step (1), progress reaction; (3)cool the solution produced by step (2); (4)drop sulphuric acid in the solution produced by step (3), appear a great quantity of crystal; (5)progress manipulation that takes off the liquid for mixture produced by step (4); (6) heat the crystal produced by step (5), dewater; (7)distill the crystal produced by step (6), produce the stated 5-methyl benzotriazole. The production method of this invention uses 3,4 diaminotoluene as raw material, through medium voltage synthesis, acidification, dehydration, distilling manipulation, to prepare 5-methyl benzotriazole. Technology is simple, preparation process is easy to control, yield is high, purity is high, production cost is low, and it is easy to organize industrialized production.

Description

technical field [0001] The present invention relates to the manufacture method of tolyltriazole, specifically a kind of production method of 5-methylbenzotriazole. Background technique [0002] After retrieving relevant patent documents, the production method of 5-methylbenzotriazole identical to the present invention has not been retrieved yet. Benzotriazole is a kind of antirust agent and corrosion inhibitor for metal, and methylbenzotriazole is mainly used as antirust agent and inhibitor for metal (such as silver, copper, lead, nickel, zinc, etc.). Corrosion agent, widely used in antirust oil (grease) products, mostly used as gas phase corrosion inhibitor of copper and copper alloy, circulating water treatment agent, automobile antifreeze, polymer stabilizer, plant growth regulator, lubricating oil additive , ultraviolet absorbers, etc., and can also be used in conjunction with a variety of scale inhibitors, bactericides and algaecides, especially for closed-loop cooling...

Claims

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Application Information

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IPC IPC(8): C07D249/18
Inventor 黄奎生
Owner 黄奎生
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