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A high-temperature corrosion inhibitor for inhibiting corrosion of high-acid value crude oil and its application

A high-temperature corrosion inhibitor and high acid value technology, applied in the field of high-temperature corrosion inhibitors and corrosion inhibitors, can solve problems such as corrosion and achieve stable adsorption performance

Active Publication Date: 2014-10-01
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, when the fluid flow rate is high or the fluid impacts the surface of the equipment, such as the oil transfer line, the rotary elbow and the restricted area, etc., it will cause severe corrosion in these parts

Method used

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  • A high-temperature corrosion inhibitor for inhibiting corrosion of high-acid value crude oil and its application
  • A high-temperature corrosion inhibitor for inhibiting corrosion of high-acid value crude oil and its application
  • A high-temperature corrosion inhibitor for inhibiting corrosion of high-acid value crude oil and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] ①Weigh 24g of phenol and 60g of xylene into another five-neck flask, stir and raise the temperature to 30°C, control the temperature at 30°C-60°C, and slowly add 14g of phosphorus pentasulfide in batches. After the feeding is completed, react at a constant temperature of 110°C for 3 hours, then raise the temperature to 150°C, and react at a constant temperature for 2 hours;

[0018] ② Mix the reaction product of step ① with 35 g of undecyl imidazoline, stir and heat up, and react at 60°C-70°C for 30 minutes;

[0019] ③Mix the reaction product of step ② with oleic acid imidazoline amide at a mass percentage ratio of 5:1 to obtain a corrosion inhibitor.

[0020] Among them, R 3 The same structure as R6, therefore, imidazoline aryl phosphate (I1) and (II1) are the same substance, the mass ratio of its total mass to imidazoline amide (III1) is 5:1, and the structural formula is:

[0021]

Embodiment 2

[0023] ① Weigh 12g phenol, 16g isooctyl alcohol and 70gC 9 Add heavy aromatics to another five-necked flask, stir and heat up to 30°C, control the temperature at 30°C-60°C, and slowly add phosphorus pentoxide 9g in batches. After the feeding is completed, react at a constant temperature of 60°C for 4 hours, then raise the temperature to 100°C, and react at a constant temperature for 2 hours;

[0024] ② Mix the reaction product of step ① with 50g of 9-heptadecenyl imidazoline, stir and heat up, and react at 60°C-70°C for 30 minutes;

[0025] ③Mix the reaction product of step ② with lauric acid imidazoline amide at a mass percentage ratio of 3:1 to obtain a corrosion inhibitor.

[0026] The mass ratio of the total mass of imidazoline aryl phosphate (I2) and (II2) to imidazoline amide (III2) is 3:1, and the structural formula is:

[0027]

Embodiment 3

[0029] ① Weigh 20g phenol, 5g benzyl alcohol and 70gC 10 Add the heavy aromatics to another five-necked flask, stir and raise the temperature to 40°C, control the temperature at 40°C-110°C, and slowly add phosphorus pentasulfide 14g in batches. After the feeding is completed, react at a constant temperature of 110°C for 3 hours, then raise the temperature to 150°C, and react at a constant temperature for 2 hours;

[0030] ②Mix the reaction product of step ① with 50g of 9,12-heptadecadienyl imidazoline, stir and heat up, and react at 60°C-70°C for 30 minutes;

[0031] ③Mix the reaction product of step ② with naphthenic acid imidazoline amide at a ratio of 1:3 by weight to obtain a corrosion inhibitor.

[0032] The mass ratio of the total mass of imidazoline aryl phosphate (I3) and (II3) to imidazoline amide (III3) is 1:3, and the structural formula is:

[0033]

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Abstract

The invention relates to a high-temperature corrosion inhibitor for restraining corrosion of high-acid value crude oil and the application of the high-temperature corrosion inhibitor. The corrosion inhibitor is a mixture of one or two of imidazoline aryl-phosphates (I) and (II) and imidazoline amide (III); the ratio of the total mass of the imidazoline aryl-phosphates to the mass of the imidazoline amide is (1:3)-(10:1). The mixture of phenols or the phenols and organic alcohol and phosphide react in an organic solvent at normal pressure at the temperature of 20-160 DEG C to generate aryl-phosphates. The aryl-phosphate and imidazoline react at the normal pressure at the temperature of 40-90 DEG C to generate the imidazoline aryl-phosphates. The corrosion inhibitor is applied to high-temperature corrosion equipment and pipelines during the refining process of the high-acid value crude oil. At the initial stage of using the corrosion inhibitor, the concentration of the corrosion inhibitor in working fluid is 100-400mug / g. After the concentration of Fe<2+> in the working fluid is lowered to a required index, the concentration of the corrosion inhibitor in the working fluid is 10-80mug / g.

Description

technical field [0001] The invention belongs to the technical field of chemical anticorrosion and relates to a corrosion inhibitor, in particular to a high-temperature corrosion inhibitor for inhibiting the corrosion of high-acid value crude oil and its application. Background technique [0002] At present, the variety and quantity of sour crude oil in my country are on the rise. Generally speaking, when the total acid value of crude oil exceeds 0.5, naphthenic acid corrosion will occur in the temperature range of 210-420 °C. Moreover, when the fluid flow rate is high or the fluid impacts the surface of the equipment, such as the oil transfer line, the return elbow and the restricted area, etc., it will cause severe corrosion in these parts. Petroleum is an irreplaceable energy source, and how to utilize it most efficiently has become a very critical issue. As the acid value of petroleum continues to increase, the corrosiveness of acid-containing petroleum to equipment is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/04
Inventor 陆原郭海军秦俊岭赵璐郭晓男王超明
Owner CHINA NAT OFFSHORE OIL CORP
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