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Water-soluble high-temperature corrosion inhibitor

A high-temperature corrosion inhibitor and water-soluble technology, which is applied in the direction of corrosion/scaling inhibition of processing equipment, petroleum industry, and hydrocarbon oil treatment, etc. It can solve the problems of poor dispersion performance, elimination, unfavorable neutralization reaction, etc., and achieve good water solubility , the effect of preventing erosion

Active Publication Date: 2014-06-25
江苏汉光实业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The corrosion damage of naphthenic acid to equipment is not only harmful to the equipment, but also has a serious impact on the secondary processing device. When naphthenic acid corrodes, serious acid iron is produced, which has a strong fine cleaning effect on the metal surface and brings FeS into the The secondary addition device will cause serious damage to the catalyst
[0004] At present, high-temperature corrosion inhibitors are mostly made of phosphorous acid, phosphate or phosphate ester, which are simple to make, but the addition amount is relatively large. Experiments have proved that the corrosion inhibition effect is not ideal when used alone.
Some corrosion inhibitor raw materials are poisonous, which will inevitably cause certain pollution to the environment, cannot be widely used, and some have even been eliminated
Corrosion inhibitors are mostly oil-soluble, and their dispersion performance in raw oil is not good, which is not conducive to the neutralization reaction with naphthenic acid in raw oil, resulting in unsatisfactory corrosion inhibition effect
Furthermore, there is a certain corrosion of the raw oil on the tower wall or pipe wall, and the existing corrosion inhibitors cannot solve this problem well

Method used

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  • Water-soluble high-temperature corrosion inhibitor

Examples

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Effect test

Embodiment 1

[0015] A water-soluble high-temperature corrosion inhibitor, composed of the following substances in mass percentage: 7.2% boric acid, 10.8% glycerin, 8.4% monoethanolamine, 30% sulfonated castor oil, and 43.6% water.

[0016] A kind of preparation method of water-soluble high-temperature corrosion inhibitor is:

[0017] (1) Preparation of anti-rust complex: Accurately weigh 120kg of water, 240kg of boric acid, and 360kg of glycerin in proportion to add to the reaction kettle, heat up to 50°C, add 280kg of monoethanolamine, then heat up to boiling, reflux for 2 hours, and then cool down to 46°C , Serve as anti-rust complex;

[0018] (2) Ingredients: pump 300kg of sulfonated castor oil and 300kg of the anti-rust complexing agent obtained in step (1) into the reactor, heat up to 100°C and stir for 30 minutes, cool down to 50°C, add 400kg of water, stir evenly to become water-soluble High temperature corrosion inhibitor.

Embodiment 2

[0020] A water-soluble high-temperature corrosion inhibitor, composed of the following substances in mass percentage: 6.5% boric acid, 10.3% glycerin, 7.9% monoethanolamine, 35% sulfonated castor oil, and 40.3% water.

[0021] A kind of preparation method of water-soluble high-temperature corrosion inhibitor is:

[0022] (1) Preparation of anti-rust complex: Accurately weigh 18kg of water, 65kg of boric acid, and 103kg of glycerin into the reactor, heat up to 50°C, add 79kg of monoethanolamine, then heat up to boiling, reflux for 2 hours, and then cool down to 48°C , Serve as anti-rust complex;

[0023] (2) Ingredients: pump 350kg sulfonated castor oil and 265kg anti-rust complexing agent obtained in step (1) into the reactor, heat up to 100°C and stir for 30 minutes, cool down to 50°C, add 385kg of water, stir evenly to become water-soluble High temperature corrosion inhibitor.

Embodiment 3

[0025] A water-soluble high-temperature corrosion inhibitor, consisting of the following substances in mass percentage: 7.5% boric acid, 11% glycerin, 8.1% monoethanolamine, 29% sulfonated castor oil, and 44.4% water.

[0026] A kind of preparation method of water-soluble high-temperature corrosion inhibitor is:

[0027] (1) Preparation of anti-rust complex: Accurately weigh 34kg of water, 75kg of boric acid, and 110kg of glycerin in proportion to add to the reaction kettle, heat up to 50°C, add 81kg of monoethanolamine, then heat up to boiling, reflux for 2 hours, and then cool down to 40°C , Serve as anti-rust complex;

[0028] (2) Ingredients: pump 290kg of sulfonated castor oil and 300kg of the anti-rust complexing agent obtained in step (1) into the reactor, heat up to 100°C and stir for 30 minutes, cool down to 50°C, add 410kg of water, stir evenly to become water-soluble High temperature corrosion inhibitor.

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Abstract

The invention discloses a water-soluble high-temperature corrosion inhibitor, which belongs to the technical field of metal corrosion and protection. The corrosion inhibitor disclosed by the invention is composed of the following components in percentage by mass: 6.5-7.6% of a boracic acid, 10-11.3% of glycerin, 7.9-9.2% of monoethanolamine, 20-40% of sulfonated castor oil, and the balance of water. The raw materials used in the invention are non-toxic, and have no side effects on products and the subsequent processing of products; the water-soluble high-temperature corrosion inhibitor disclosed by the invention is good in water-solubility, no cosolvent is not required to be added when the corrosion inhibitor is used in a formula, and no laying phenomenon occurs when the corrosion inhibitor is compounded with any organic amine, thereby facilitating a neutralization reaction between the corrosion inhibitor and a naphthenic acid in raw oil; and a rust-proof complex of the corrosion inhibitor in the invention and sulfonated castor oil can form a dense and firm protective film in a high-temperature tower, thereby effectively preventing the raw oil from eroding the inner wall of the tower.

Description

technical field [0001] The invention belongs to the technical field of metal corrosion and protection, in particular to a water-soluble high-temperature corrosion inhibitor. Background technique [0002] As the main equipment material, metal is widely used in the industry, and the application of corrosion and protection of metal materials is becoming more and more extensive. One of the effective ways to solve the corrosion of metal materials is to use corrosion inhibitors to protect metals. [0003] Naphthenic acid is an organic acid with saturated ring structure widely present in crude oil. In the crude oil refining process, naphthenic acid usually causes corrosion damage to the refining equipment system and pipeline, and is related to the total acid number (TAN) of crude oil in the processing process. When the TAN is greater than 0.2, the naphthenic acid is Corrosion occurs, and significant corrosion occurs when TAN is greater than 0.5, especially in high-speed areas such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G75/02
Inventor 顾法明
Owner 江苏汉光实业股份有限公司
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