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Composite corrosion inhibitor resisting to corrosion CO2/H2S/HCl corrosion

A composite corrosion inhibitor and corrosion inhibitor technology, applied in the field of corrosion inhibitor and composite corrosion inhibitor, can solve the problems of affecting the adsorption effect, unable to achieve the inhibitory effect, large steric hindrance, etc.

Active Publication Date: 2014-03-26
中海油(天津)油田化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are mainly the use of organic dibasic acid and organic amine or the reaction of dinitrile and organic amine to generate bis-imidazoline and the reaction of epichlorohydrin as a linking group to generate bis-imidazoline quaternary ammonium salt, etc., but these bis-imidazolines are due to space Larger steric hindrance and other reasons affect the actual adsorption effect
Gemini-type corrosion inhibitors based on this type of bis-imidazoline cannot simultaneously treat CO 2 、H 2 Corrosion in one or more coexisting environments of S and HCl has a good inhibitory effect

Method used

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  • Composite corrosion inhibitor resisting to corrosion CO2/H2S/HCl corrosion
  • Composite corrosion inhibitor resisting to corrosion CO2/H2S/HCl corrosion
  • Composite corrosion inhibitor resisting to corrosion CO2/H2S/HCl corrosion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] ① Dissolve 6g of thiourea in 34g of isoamyl alcohol, then mix 40g of heptadecyl imidazoline with 0.13g of H 3 BO 3 After mixing and raising the temperature to 100°C, start to add the isoamyl alcohol solution of thiourea dropwise, and control the temperature at 100°C to 130°C, finish the dropwise addition in 2 to 3 hours, and then react at 105°C to 130°C for 9 hours;

[0017] ② Mix 15g of triethylenetetramine, 6g of thiourea and 21g of n-butanol, stir and heat up, and react at 105°C to 120°C for 8 hours;

[0018] ③Mix the reaction products of steps ① and ② at a ratio of 4:1 to obtain the corrosion inhibitor.

Embodiment 2

[0020] ①Dissolve 5g of thiourea in 35g of benzyl alcohol, then mix 40g of 9-heptadecenyl imidazoline with 0.12g of H 3 BO 3 After mixing and raising the temperature to 100°C, start to add the benzyl alcohol solution of thiourea dropwise, and control the temperature at 100°C to 130°C for 2 to 3 hours, then react at 140°C to 160°C for 5 hours;

[0021] ② Mix 20g of tetraethylenepentamine, 6g of thiourea and 26g of benzyl alcohol, stir and heat up, and react at 140°C to 160°C for 6 hours;

[0022] ③Mix the reaction products of steps ① and ② at a mass ratio of 1:1 to obtain a corrosion inhibitor.

Embodiment 3

[0024] ①Dissolve 5g of thiourea in 35g of n-butanol, then mix 40g of 9,12-heptadecadienyl imidazoline with 0.15g of H 3 BO 3 After mixing and raising the temperature to 100°C, start to add the n-butanol solution of thiourea dropwise, and control the temperature at 100°C to 115°C, finish the dropwise addition in 2 to 3 hours, and then continue the reaction at 100°C to 115°C for 10 hours;

[0025] ② Mix 25g of pentaethylenehexamine, 5g of thiourea and 30g of isoamyl alcohol, stir and heat up, and react at 100°C to 115°C for 10 hours;

[0026] ③Mix the reaction products of steps ① and ② at a mass ratio of 5:1 to obtain a corrosion inhibitor.

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Abstract

The invention belongs to a composite corrosion inhibitor resisting to corrosion CO2 / H2S / HCl corrosion. First an organic solvent solution A of 15% thiocarbamide is prepared; imidazoline is added with H3BO3 as a catalyst and then reacts with the solution A to prepare a product (I). Organic polyamine and a urea compound are mixed to prepare a product (II) at 100-160 DEG C. The product (I) and the product (II) are mixed at the mass ratio of (1:1) to (10:1) to obtain the composite corrosion inhibitor resisting to corrosion CO2 / H2S / HCl corrosion. The corrosion inhibitor can form stabler adsorption films, has a wider application range, can effectively control the corrosion of one of CO2, H2S and HCl or two or three of CO2, H2S and HCl in a coexistence environment in the processes of oil-gas-water treatment and raw oil refining, and is low in dosage and high in inhibition efficiency. The corrosion inhibitor can effectively protect equipment and pipeline corroded by CO2, H2S and HCl when applied in the processes of oil-gas-water treatment and raw oil refining.

Description

technical field [0001] The invention belongs to the technical field of chemical anticorrosion and relates to a corrosion inhibitor, in particular to a method for inhibiting CO in the process of oil, gas, water treatment and crude oil refining. 2 、H 2 Composite corrosion inhibitor for corrosion under one or more coexisting environments of S and HCl. Background technique [0002] CO 2、 h 2 Corrosion in one or more coexistence environments of S and HCl is one of the main causes of corrosion failure of equipment and pipelines in oil, gas, water treatment and crude oil refining processes, causing huge economic losses every year. Adding corrosion inhibitors can effectively and economically achieve the purpose of corrosion control. Therefore, adding corrosion inhibitors has become a necessary procedure for many oil and gas fields and refining and chemical enterprises in China. [0003] Commonly used corrosion inhibitors in oil, gas, water treatment and crude oil refining proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/02C23F11/04
CPCC23F11/04
Inventor 陆原郭海军闫化云唐晓静张勇张颖贾永富
Owner 中海油(天津)油田化工有限公司
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