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Synthesis process of 1-n-butyl-1h-benzotriazole

A technology of benzotriazole and synthesis process, which is applied in the direction of organic chemistry, can solve the problems of poor corrosion inhibition effect and limitations, and achieve the effect of simple production equipment, low investment and high purity

Active Publication Date: 2016-03-09
NANTONG BOTAO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of benzotriazole in combination with various corrosion inhibitors can improve the corrosion inhibition effect; but in the actual application process, it is found that benzotriazole has good corrosion inhibition effect in neutral and partial alkaline medium, but The corrosion inhibition effect in acidic medium is poor, which greatly limits its application, and 1-n-butyl-1H-benzotriazole has a good corrosion inhibition effect on copper, silver and other metals, and can be used as a new type of corrosion inhibitor Material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Dissolve 11.9g (0.1mol) of benzotriazole in 200ml of ethanol solution containing 7.2g of sodium ethoxide, stir, add 0.5g of phase transfer catalyst TEBAC, keep room temperature, dropwise add 15.1g of 1-bromobutane Ethanol solution, keep uniform dropwise, after the dropwise addition is completed, raise the temperature to 50°C and react for 2 hours. After the reaction is completed, recover the ethanol and use it mechanically. Pressure rectification, collecting fractions at 115-118°C / 15mmHg, yielded 14.9g of the product with a yield of 85.1% and a GC content of 97%.

Embodiment 2

[0019] Dissolve 11.9g (0.1mol) of benzotriazole in 200ml of ethanol solution containing 7.2g of sodium ethoxide, stir, add 0.5g of phase transfer catalyst TEBAC, keep room temperature, dropwise add 15.1g of 1-bromobutane Ethanol solution, keep adding dropwise evenly, after the dropwise addition is completed, raise the temperature to 45°C and react for 2 hours. After the reaction is completed, recover the ethanol and use it mechanically. Pressure rectification, collecting fractions at 115-118°C / 15mmHg, yielded 14.5g of the product with a yield of 84.8% and a GC content of 96%.

Embodiment 3

[0021] Dissolve 11.9g (0.1mol) of benzotriazole in 200ml of ethanol solution containing 7.2g of sodium ethoxide, stir, add 0.5g of phase transfer catalyst TEBAC, keep room temperature, dropwise add 15.1g of 1-bromobutane Ethanol solution, keep adding dropwise evenly, after the dropwise addition is completed, raise the temperature to 55°C and react for 2 hours. After the reaction is completed, recover the ethanol and use it mechanically. Pressure rectification, collecting fractions at 115-118°C / 15mmHg, yielded 15.2 g of the product, with a yield of 85.3% and a GC content of 97.5%.

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Abstract

The invention discloses a synthesis process of 1-n-butyl-1H-benzotriazole. The synthesis process comprises the following steps: dissolving benzotriazole in an ethanol solution containing sodium ethoxide, stirring, adding a phase transfer catalyst, keeping room temperature, dropping the ethanol solution containing 1-bromo-n-butane, completing the dropping, heating to 45-55 DEG C, reacting for 1.5-2.5h, recovering ethanol for applying mechanically after the end of reaction, dissolving residues with water, extracting by using an extracting agent, merging organic layers, recovering the extracting agent, performing decompression rectification on the residues, and collecting fractions to obtain a product. The synthesis process of the 1-n-butyl-1H-benzotriazole, disclosed by the invention, has the advantages of high quality, high purity and low energy consumption of the product, simple production equipment, easy control of process parameters and low investment.

Description

technical field [0001] The invention relates to a synthesis process of 1-n-butyl-1H-benzotriazole, which belongs to the technical field of fine chemical preparation. Background technique [0002] Benzotriazole is an important fine chemical product, used as antirust agent and corrosion inhibitor for metals, used in antirust oil (grease) products, anti-corrosion to copper and its alloys, silver and its alloys The corrosion effect is particularly obvious, and it is mostly used as a gas phase corrosion inhibitor for copper and copper alloys, a metal rust inhibitor, and a photographic antifogging agent. Dye intermediates, polymer material stabilizers, plant growth regulators, anti-tarnish agents, vapor phase corrosion inhibitors and UV absorbers. The use of benzotriazole in combination with various corrosion inhibitors can improve the corrosion inhibition effect; but in the actual application process, it is found that benzotriazole has good corrosion inhibition effect in neutral...

Claims

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Application Information

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