Neutralized corrosion inhibitor for petrochemical h2s-hcl-co2-hcn-h2o corrosion system

A technology of h2s-hcl-co2-hcn-h2o and petrochemical industry, applied in the field of neutralizing anti-corrosion and corrosion inhibitors, can solve the problems of unguaranteed source of raw materials, poor corrosion inhibition performance, less production, etc., to achieve the development of the market and application promotion, safety and environmental protection in the production process, and stable product performance

Active Publication Date: 2018-08-21
徐文忠 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional naphthenic acid imidazoline corrosion inhibitors are mainly produced from the by-product naphthenic acid in the process of high-acid crude oil processing. High-acid crude oil is mostly heavy crude oil. The cost and price of high-quality crude oil are also constantly falling. Refinery companies use more light crude oil, and the production of naphthenic acid is less and less. Alkanoic acid is also mostly used in paint and other industries, so the source of raw materials cannot be guaranteed, and the purchase cost is high. At the same time, naphthenic acid has a strong odor, and there are many problems in use, storage and transportation, while oleic acid imidazoline corrosion inhibitors The corrosion inhibitor is a product developed in the 1970s. The most representative one is the 7019 corrosion inhibitor. Although it has been improved, it is still relatively backward in performance and technology. There are problems such as poor corrosion inhibition performance, unstable products, Defects such as easy to calm down

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1. Mix 300kg of malic acid, 100kg of tartaric acid and 400kg of ethylene glycol, stir evenly, heat to 120°C, add 200kg of polyethylene polyamine, and react for 2 hours to obtain reactant 1;

[0035] Step 2, add the ethylene glycol of 300kg in reactant 1, obtain reactant 2;

[0036] Step 3, Reactant 2 was cooled to 90°C, 260Kg of deionized water was added, cooled to room temperature, and Reactant 3 was obtained;

[0037] Step 4: Add 62.4Kg of hexamethylenetetramine and 7.8Kg of thiourea to the reactant 3, and stir evenly to obtain a neutralized corrosion inhibitor.

Embodiment 2

[0039] Step 1. Mix 300kg of malic acid, 100kg of tartaric acid and 400kg of ethylene glycol, stir evenly, heat to 130°C, add 200kg of polyethylene polyamine, and react for 3 hours to obtain reactant 1;

[0040] Step 2, add the ethylene glycol of 300kg in reactant 1, obtain reactant 2;

[0041] Step 3, Reactant 2 was cooled to 90°C, 260Kg of deionized water was added, cooled to room temperature, and Reactant 3 was obtained;

[0042] Step 4: Add 93.6Kg of hexamethylenetetramine and 15.6Kg of thiourea to the reactant 3, and stir evenly to obtain a neutralized corrosion inhibitor.

[0043] Anti-corrosion performance verification:

[0044] H at 1000ppm 2 S-HCl-CO 2 -HCN-H 2 In O strong corrosive medium, the minimum corrosion inhibition rate of the neutralization corrosion inhibitor prepared by the present invention can reach more than 92%, and the average corrosion inhibition rate is 94%; The average corrosion inhibition rate of naphthenic acid imidazoline is 88%, oil The aver...

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PUM

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Abstract

The invention discloses a neutralizing anticorrosion inhibitor for a petrochemical industry H2S-HCL-CO2-HCN-H2O corrosion system. The neutralizing anticorrosion inhibitor is prepared through the steps that malic acid, tartaric acid and glycol are mixed, stirred uniformly and heated to the temperature of 120-130 DEG C, polyethylene polyamine is added, and the mixture is subjected to the reaction for 2-3 h to obtain a reactant 1; glycol is added into the reactant 1 to obtain a reactant 2; the reactant 2 is cooled to 90 DEG C, deionized water is added, and the mixture is cooled to room temperature to obtain a reactant 3; and auxiliary synergist is added into the reactant 3 to obtain the neutralizing anticorrosion inhibitor, wherein the auxiliary synergist comprises hexamethylene tetramine and thiourea. The anticorrosion property of the neutralizing anticorrosion inhibitor is obviously superior to that of a current oil acid imidazoline and naphthenic acid imidazoline anticorrosion inhibitor, moreover, the preparation process is green and environment-friendly, and pollution to the environment is avoided.

Description

technical field [0001] The present invention relates to a kind of neutralization corrosion inhibitor used in petrochemical system, especially a kind of used in petrochemical H 2 S-HCl-CO 2 -HCN-H 2 Neutralized corrosion inhibitor for O corrosion systems. Background technique [0002] At present, the main components of corrosion inhibitor products are mainly imidazoline compounds, including naphthenic acid imidazolines, oleic acid imidazolines, modified oleic acid imidazolines, etc. Among them, naphthenic acid imidazolines have better and representative effects. Traditional naphthenic acid imidazoline corrosion inhibitors are mainly produced from the by-product naphthenic acid in the process of high-acid crude oil processing. High-acid crude oil is mostly heavy crude oil. The cost and price of high-quality crude oil are also constantly falling. Refinery companies use more light crude oil, and the production of naphthenic acid is less and less. Alkanoic acid is also mostl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/10
CPCC23F11/10
Inventor 徐文忠
Owner 徐文忠
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