High-temperature corrosion inhibitor for H2S-HCl-H2O system and preparation method of high-temperature corrosion inhibitor

A high-temperature corrosion inhibitor, h2s-hcl-h2o technology, applied in the field of anticorrosion of materials in the petrochemical field, can solve the problems of inability to protect equipment for a long time, endanger the health of operators, increase operating costs, etc., and achieve a wide range of operating temperatures, Less environmental pollution and anti-corrosion effect

Active Publication Date: 2015-03-25
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this kind of corrosion inhibitors are their bad smell, easy hydrolysis, and short validity period, which cannot protect equipment for a long time, increase operating costs, and endanger the health of operators.

Method used

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  • High-temperature corrosion inhibitor for H2S-HCl-H2O system and preparation method of high-temperature corrosion inhibitor
  • High-temperature corrosion inhibitor for H2S-HCl-H2O system and preparation method of high-temperature corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 34g (0.2mol) of methyl-α-naphthyl ketone, 69.6g (0.8mol) of morpholine, and 35.2g (0.26mol) of sulfur into a three-necked flask, and react 9 at the reflux temperature of morpholine (128°C). hour; Then filter and remove the unreacted sulfur to obtain naphthaleneethylthiomorpholine, then naphthylethylthiomorpholine 30g, cetylpyridine 5g, diethanolamine 10g, potassium molybdate 2g, water 5g and 33g of N,N'-dimethylformamide were mixed, stirred evenly to obtain H 2 S-HCl-H 2 High temperature corrosion inhibitor for O system.

Embodiment 2

[0030] Add 17g (0.1mol) of methyl-α-naphthyl ketone, 52g (0.6mol) of morpholine, and 17.6g (0.13mol) of sulfur into a three-necked flask, and react for 6 hours at the reflux temperature of morpholine (128°C) ; Then remove the unreacted sulfur by filtration to obtain naphthylethylthiomorpholine. Mix 50g of naphthylethylthiomorpholine, 10g of cetylpyridine, 15g of diethanolamine, 3g of potassium molybdate, 7g of water and 40g of N,N'-dimethylformamide, and stir evenly to obtain H 2 S-HCl-H 2 High temperature corrosion inhibitor for O system.

Embodiment 3

[0032] Add 34g (0.2mol) of methyl-α-naphthyl ketone, 34.8g (0.4mol) of morpholine, and 35.2g (0.26mol) of sulfur into a three-necked flask, and react 8 at the reflux temperature of morpholine (128°C). Hours; then filter to remove unreacted sulfur, that is, to obtain naphthyl ethyl thiomorpholine. Mix 35g of naphthylethylthiomorpholine, 15g of cetylpyridine, 10g of triethanolamine, 1g of potassium tungstate, 5g of water and 34g of N,N'-dimethylformamide, and stir evenly to obtain H 2 S-HCl-H 2 High temperature corrosion inhibitor for O system.

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Abstract

The invention relates to a high-temperature corrosion inhibitor for an H2S-HCl-H2O system and a preparation method of the high-temperature corrosion inhibitor. According to the preparation method, methyl-alpha-naphthyl ketone, morpholine and sulfur are taken as main raw materials and are subjected to a Willgerodt-Kindler method to generate naphthylethyl thioacylmorpholine. The high-temperature corrosion inhibitor comprises the following components in percentage by weight: 30%-50% of ethyl thioacylmorpholine, 5%-15% of hexadecyl pyridine, 10%-15% of alcohol amine compounds, 1%-3% of potassium molybdate or potassium tungstate and 29%-57% of a solvent. The high-temperature corrosion inhibitor belongs to strong-adsorption mixed type corrosion inhibitors, is capable of forming a layer of compact protecting film on the surface of metal and particularly applicable to the corrosion prevention of the H2S-HCl-H2O system and can be generalized and used for the prevention of sulfuretted hydrogen corrosion in the industries of oil fields, boilers and steel mills. The use temperature of the high-temperature corrosion inhibitor during the use can reach 120 DEG C; the high-temperature corrosion inhibitor has the characteristics of low consumption, high efficiency, wide use temperature range, good dispersity and low environmental pollution and is simple and convenient to produce.

Description

technical field [0001] The invention belongs to the technical field of anticorrosion of materials in the field of petrochemical industry, and specifically relates to a H 2 S-HCl-H 2 High temperature corrosion inhibitor for O system and its preparation method. Background technique [0002] In petrochemical plants, H 2 S-HCl-H 2 The mixed corrosion of O system is a serious problem. The type of corrosion mechanism, the severity of corrosion damage and the impact on safe production are far better than those of other factories. The high-temperature parts of the heavy oil unit are usually made of corrosion-resistant materials, while the low-temperature light oil parts at the top of the distillation tower are subjected to HCl-H 2 S-H 2 For the corrosion of O system, if austenitic stainless steel is used, there will be Cl - To solve the problem of stress corrosion cracking, chemical injection anti-corrosion technology is generally used, that is, neutralizers are used to reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/04
Inventor 张娟涛李谦定孙晓玉王远尹成先韩燕蔡锐李发根
Owner BC P INC CHINA NAT PETROLEUM CORP
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