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Heterocyclic nitrogen compound, preparation and application thereof

A technology of compound and nitrogen heterocycle, which is applied in the field of nitrogen heterocycle compound and its preparation and application, can solve the problems of scarcity of corrosion inhibitors, loss of performance, poor activity, etc., and achieve the effect of convenient synthesis, inhibition of damage, and low cost

Inactive Publication Date: 2012-06-27
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although copper ranks after hydrogen in the metal activity sequence table, and its activity is poor, copper is also extremely susceptible to corrosion damage to varying degrees in systems containing chloride ions, sulfates, nitrates and other corrosive media, thus Lose its original various performances, and even bring huge disasters
[0004] At present, although there have been many reports on seawater corrosion inhibitors for metallic copper, the number of corrosion inhibitors that can be used in actual production is extremely rare, and most of them still use traditional benzotriazole compounds as copper corrosion inhibitors. agent, which brings a series of economic and environmental problems to the production process

Method used

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  • Heterocyclic nitrogen compound, preparation and application thereof
  • Heterocyclic nitrogen compound, preparation and application thereof
  • Heterocyclic nitrogen compound, preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The nitrogen heterocyclic compounds are a: 5-o-toluene-[1,3,4]thiadiazole-2-mercapto; b: 5-m-toluene-[1,3,4]thiadiazole-2- Mercapto; c: 5-p-toluene-[1,3,4]thiadiazole-2-mercapto, the structural formula is:

[0024]

[0025] Preparation:

[0026] The chemical reaction equation is:

[0027]

[0028] First, a: o-toluic acid (or b: m-toluic acid, c: p-toluic acid) is mixed with methanol equimolarity, and reaction dehydration obtains methyl toluate (I); the product (I ) react with excess hydrazine hydrate, reflux at 80°C for 4-5h to obtain acetylhydrazide (II); heat the obtained reaction product (II) and slightly excess carbon disulfide under NaOH (or KOH) alkaline environment to reflux at 75°C, 3-4h reaction to generate compound (III); the product (III) was cyclized under the catalysis of concentrated sulfuric acid at an oil bath temperature of 75°C for 1-2h to obtain product a: 5-o-toluene-[1,3,4] Thiadiazole-2-mercapto; b: 5-m-toluene-[1,3,4]thiadiazole-2-mercapt...

Embodiment 2

[0046] Conditions: The experimental material is red copper (99.999%), three kinds of corrosion inhibitors a, b, and c are dissolved in cyclohexanone respectively, and the weight ratio of it and cyclohexanone is 1:10, and then ultrasonic waves are used at room temperature The disperser ultrasonically dispersed the mixed solution for 20 minutes to make it completely dissolved; then, the fully dissolved solution was added to the OP-10 emulsifier (Tianjin Damao Chemical Instrument Supply Station, the trade name is emulsifier OP-10) In the method, the weight ratio of OP-10 emulsifier to cyclohexanone is 1:1, stir evenly at room temperature to obtain corrosion inhibitor, and then immerse red copper (99.999%) in pH=6.5 at 25°C In the corrosion inhibitor, the soaking time is 30min.

[0047] The three nitrogen heterocyclic compounds a, b and c are mixed with 0.5L, 3.5% sodium chloride solution, and the effective content of the three nitrogen heterocyclic compounds a, b and c in the cor...

Embodiment 3

[0054] Conditions: The experimental material is red copper (99.999%), three kinds of corrosion inhibitors a, b, and c are dissolved in cyclohexanone respectively, and the weight ratio of it and cyclohexanone is 1:10, and then ultrasonic waves are used at room temperature The disperser ultrasonically dispersed the mixed solution for 20 minutes to make it completely dissolved; then, the fully dissolved solution was added to the OP-10 emulsifier (Tianjin Damao Chemical Instrument Supply Station, the trade name is emulsifier OP-10) In the method, the weight ratio of OP-10 emulsifier to cyclohexanone is 1:1, stir evenly at room temperature to obtain corrosion inhibitor, and then immerse red copper (99.999%) in pH=6.5 at 25°C In the corrosion inhibitor, the soaking time is 30min.

[0055] The three nitrogen heterocyclic compounds a, b, and c are mixed with 0.5L, 3.5% sodium chloride solution, and the effective content of the three nitrogen heterocyclic compounds a, b, and c in the c...

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Abstract

The invention relates to a seawater corrosion inhibitor for copper, specifically to a heterocyclic nitrogen compound, its preparation and its application. The heterocyclic nitrogen compound is a: 5-o-toluene-[1,3,4]thiadiazole-2-mercapto; b: 5-m-toluene-[1,3,4]thiadiazole-2-mercapto; and c: 5-p-toluene-[1,3,4]thiadiazole-2-mercapto. The structural formula is as shown in the description. The heterocyclic nitrogen compound can be a seawater corrosion inhibitor for a copper product. The corrosion inhibitor provided by the invention has advantages of small amount, little toxicity, high efficiency and strong continuously acting capability, can be used to effectively inhibit corrosion and destroy to metal copper, and has a wide application prospect.

Description

technical field [0001] The invention relates to a seawater corrosion inhibitor for copper, in particular to a nitrogen heterocyclic compound and its preparation and application. Background technique [0002] With the continuous consumption of various resources on land, the development and utilization of marine resources has become an inevitable way to solve the current resource depletion. However, seawater is a strong electrolyte solution with strong corrosiveness, which greatly limits the development and utilization of marine resources. Therefore, only by solving the corrosion problem of metal materials in seawater can the development and utilization value of marine resources be truly reflected. [0003] Copper has excellent mechanical strength, machinability, electrical conductivity, thermal conductivity, weldability and other characteristics, and has been widely used in industry, military and civilian fields for a long time. However, although copper ranks after hydrogen...

Claims

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Application Information

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IPC IPC(8): C07D285/125C23F11/16
Inventor 李伟华白雪曹锟孙丛涛侯保荣
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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