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Water-soluble corrosion-retarding neutralizer and its preparation process

A water-soluble, corrosion inhibitor technology, applied in the field of corrosion inhibitor neutralizer, can solve the problems of inconvenient operation, poor solubility, low corrosion inhibition efficiency, etc., to reduce the number of maintenance, chemical stability and thermal stability , high corrosion inhibition effect

Inactive Publication Date: 2006-11-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the corrosion inhibitors actually used in petrochemical oil refineries still have certain defects: some of them are used in high dosage, and the corrosion inhibition efficiency is low, which causes pitting corrosion of carbon steel
Some have poor solubility, which often cause blockage of the corrosion inhibitor delivery pipeline and nozzle injection.
Some have high anti-corrosion efficiency, but have a single function, which brings inconvenience to on-site operation

Method used

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  • Water-soluble corrosion-retarding neutralizer and its preparation process
  • Water-soluble corrosion-retarding neutralizer and its preparation process
  • Water-soluble corrosion-retarding neutralizer and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 85# naphthenic acid with a crude acid value of 185.4mgKOH / g and diethylenetriamine were put into the reactor at a ratio of 1:1 MOL / MOL, 5% of 120# solvent oil was added, and refluxed at 100°C for 2 hours to obtain A naphthenic acid imidazoline intermediate with an acid value of 2.89 mgKOH / g. Then put the intermediate and ethylene propionic anhydride into the reactor at a molar ratio of 1:0.5, add 5% methanol solvent, react at room temperature for 0.5 hours, and control the reaction temperature not to exceed 80°C to obtain the water-soluble naphthenic acid imidazoline corrosion inhibitor agent. Add 50mg / L of the prepared corrosion inhibitor into the corrosive medium of 1000mg / L HCL+1000mg / L H2S, at 85°C, the corrosion inhibition rate of the A3 steel test piece is 24.75g of the blank sample / m 2 .h down to 0.61g / m 2 .h, the corrosion inhibition efficiency is 97.5%. 10% of the corrosion inhibitor, 10% of the neutralizing agent methylamine, and 80% of methanol solvent w...

Embodiment 2

[0029] The naphthenic acid imidazoline intermediate synthesized according to the conditions of Example 1 was reacted with ethylene oxide at a molar ratio of 1:5 at 120-125° C. for 0.5 hour to obtain the naphthenic acid imidazoline polyoxyethylene corrosion inhibitor. Under the same corrosive medium and corrosion conditions as in Example 1, the corrosion inhibition rate of this product measured is 2.45g / m 2 .h, the corrosion inhibition efficiency is 90.1%. 20% of the corrosion inhibitor, 20% of the neutralizing agent ethylamine, 20% of a 10% NaOH aqueous solution, and 30% of methanol were mixed at 50°C for half an hour to obtain the corrosion inhibitor and neutralizer product. After analysis and testing, its physical and chemical properties all meet the requirements of product quality indicators.

Embodiment 3-12

[0030] Embodiment 3-12 (see Table 1)

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Abstract

The invention relates to a water-soluble corrosion-inhibiting neutralizer mainly used for metal anticorrosion of low-temperature light oil parts in refineries and a preparation method thereof, which is made of naphthenic acid, polyene polyamine, organic acid anhydride or ethylene oxide as raw materials The prepared naphthenic acid imidazoline corrosion inhibitor is compounded with neutralizer and solvent. Compared with similar corrosion inhibitors, it has good water solubility, high corrosion inhibition efficiency, chemical stability and thermal stability. Well, the characteristics of equivalent dosage, integrated membrane corrosion inhibitor and neutralization dual functions in one, make the on-site operation easier, change the conventional "one removal and four injection" process, simplify it to "one removal and one injection" process, reduce HCL-H in the low temperature part of the tower top condensing cooling system 2 S-H 2 The corrosion and scaling of O can reduce energy consumption, significantly increase the service life of equipment, and reduce the number of maintenance.

Description

Technical field: [0001] The invention relates to a water-soluble corrosion inhibitor neutralizer for metal anticorrosion and a preparation method thereof, in particular to a corrosion inhibitor neutralizer compounded from an imidazoline type corrosion inhibitor and a neutralizer, It is mainly used for anticorrosion of low-temperature light oil parts in petrochemical refineries. Background technique: [0002] Imidazoline corrosion inhibitors have become the most active and widely used new generation of corrosion inhibitors at home and abroad because of their outstanding and excellent corrosion inhibition performance. In refineries and petrochemical plants, it is mainly used for atmospheric and vacuum devices and other equipment, devices and pipelines that can generate acid gases or liquids such as HCL or H2S. In the past, the commonly used anti-corrosion measures for the low-temperature light oil part of the atmospheric and vacuum distillation unit were "one removal and four...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/14
Inventor 牛春革孟祥胜韩韫马玲韩云乔文
Owner PETROCHINA CO LTD
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