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Corrosion inhibitor for sulfur-containing wet gas pipeline and preparation method thereof

A technology for transportation pipelines and corrosion inhibitors, which is applied in the field of corrosion inhibitors and preparations for sulfur-containing wet gas transportation pipelines, can solve the problems of poor corrosion inhibition effects and limited protection effects, and achieve increased protection area, low cost, and long-term effect

Active Publication Date: 2018-11-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are relatively few studies on corrosion inhibitors for natural gas surface pipeline corrosion. For the inner wall of natural gas pipelines, oil-soluble corrosion inhibitors are the main corrosion inhibitors. This kind of corrosion inhibitors has good adsorption and film-forming properties, and the specific gravity is generally 0.85. ~0.98g / cm 3 , suitable for simple high CO 2 Corrosive corrosion environment, the corrosion inhibition effect is poor when the water content and liquid level of the pipeline effusion are high, and the protection effect on the corrosive environment of the pipeline effusion with high water content and high salinity is limited

Method used

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  • Corrosion inhibitor for sulfur-containing wet gas pipeline and preparation method thereof
  • Corrosion inhibitor for sulfur-containing wet gas pipeline and preparation method thereof

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preparation example Construction

[0025] The preparation method of the intermediate product is as follows: add lauric acid and tetraethylenepentamine reaction materials into the reactor and react at 150±5°C for 3h, then raise the temperature to 230°C for 2h, then use sodium chloroacetate / alkali as a catalyst, and react at 180°C Stir at ±5°C for catalytic reaction for 1 to 1.5 hours, and cool to room temperature to obtain the intermediate product.

[0026] A preparation method for a corrosion inhibitor for a sulfur-containing wet gas pipeline, comprising the following steps:

[0027] Step 1: Add lauric acid and tetraethylenepentamine to the reactor according to the mass ratio of 1: (1~2), react at 150±5°C for 3h, then raise the temperature to 230°C for 2h, and then use sodium chloroacetate / alkali As a catalyst, stir the catalytic reaction at 180±5°C for 1-1.5 hours, then cool to room temperature to obtain the intermediate product;

[0028] Step 2: React 35-50 parts of intermediate product with 3.2-4.8 parts of...

Embodiment 1

[0032] On the three-neck flask equipped with water separator, reflux condenser and stirrer, add lauric acid and tetraethylenepentamine reaction materials into the reactor at a mass ratio of 1:1.05, and react at (150±5)°C for 3 hours. Rapidly raise the temperature to 230°C for 2 hours of reaction. During the reaction, water will continue to distill out. After dehydration at high temperature, use sodium chloroacetate / alkali as a catalyst, stir at 180±5°C for 1 hour of catalytic reaction, and cool to room temperature to obtain intermediate product.

[0033] The mass parts were 35 parts of intermediate product and 4.8 parts of thiourea were reacted at (150±5)°C for 3 hours, then 2.4 parts of triethanolamine phosphate and 1.2 parts of phosphorous acid were added for phosphating for 1 hour, and then the temperature was lowered to (50±5)°C and added Fully dissolved in 60 parts of water, cooled to normal temperature to obtain imidazolylphosphine corrosion inhibitor. Using n-octane to...

Embodiment 2

[0035] On the three-neck flask equipped with water separator, reflux condenser and stirrer, add lauric acid and tetraethylenepentamine reaction materials into the reactor at a mass ratio of 1:1.2, and react at (150±5)°C for 4 hours. Rapidly raise the temperature to 230°C for 2 hours of reaction. During the reaction, water will continue to distill out. After high temperature dehydration, use sodium chloroacetate / alkali as a catalyst, stir at 180±5°C for 1.5 hours, and cool to room temperature to obtain mid product.

[0036]The mass parts are 50 parts of the intermediate product and 3.2 parts of thiourea to react at (150±5)°C for 4 hours, then add 1.2 parts of triethanolamine phosphate and 2.4 parts of phosphorous acid for 2 hours, then cool down to (50±5)°C and add Fully dissolve 40 parts of water, cool down to (50±5)°C, add 50 parts of water to fully dissolve, cool to normal temperature to obtain imidazolylphos corrosion inhibitor. Using n-octane to simulate the influence of ...

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Abstract

The invention discloses a corrosion inhibitor for a sulfur-containing moisture conveying pipeline and a preparation method thereof. The preparation raw materials comprise, by mass, 35-50 parts of intermediate products, 3.2-4.8 parts of thiourea, 1.2-2.4 parts of phosphoric acid triethanolamine, 1.2-2.4 parts of sulfurous acid and 40-60 parts of water. The preparation raw materials of the intermediate products comprise laurate acid and tetraethylenepentamine, and the mass ratio of the lauric acid to the tetraethylenepentamine is 1: (1-2). The corrosion inhibitor prepared by the invention has the advantages of small dosage, long validity period, low cost and the like, and can effectively control pipeline corrosion when applied in actual production, so that safe production is guaranteed.

Description

technical field [0001] The invention belongs to the field of metal material corrosion and protection in the internal corrosion environment of natural gas well surface pipelines, and in particular relates to a corrosion inhibitor for sulfur-containing wet gas transmission pipelines and a preparation method thereof. Background technique [0002] The corrosion characteristics of the surface gas transmission pipeline in Changqing gas field is the slight H 2 S, low carbon dioxide content, different concentrations of HCO in produced water 3 - , Cl - Ions, etc., and the pH value of the corrosive medium changes greatly. The surface pipelines serving in this corrosive environment are all made of 20# ordinary carbon steel, and some pipelines are relatively severely corroded. During the production process, corrosion inhibitors need to be added to control the internal corrosion of the pipelines. [0003] At present, there are relatively few studies on corrosion inhibitors for natura...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/02
CPCC23F11/02
Inventor 董晓焕朱方辉李明星李琼玮姜毅刘伟付彩利张振云
Owner PETROCHINA CO LTD
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