Corrosion inhibitor for restraining metal corrosion, and preparation method

A metal corrosion and corrosion inhibitor technology, applied in the field of corrosion inhibitors, can solve the problems of complex product composition, high cost, and the film duration is not reported in detail, and achieves the effect of long film duration and high film formation strength.

Active Publication Date: 2007-10-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is different from the medicament structure of the present invention, and requires multiple components to be compounded an...

Method used

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  • Corrosion inhibitor for restraining metal corrosion, and preparation method
  • Corrosion inhibitor for restraining metal corrosion, and preparation method
  • Corrosion inhibitor for restraining metal corrosion, and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of imidazolines containing sulfur amides

[0036]Use industrial oleic acid mixture (containing 40% oleic acid) and tetraethylenepentamine in a molar ratio of 2:2 to carry out the reaction in a four-necked flask or a chemical reactor (such as a Lab Max reactor). The flask is equipped with a stirrer, a liquid inlet funnel (the same as the inlet for nitrogen protection), a thermometer, and a branch pipe connecting the water separator and the condenser. Heat the industrial oleic acid to 60°C under the condition of nitrogen flow, then quickly add tetraethylenepentamine dropwise through the separatory funnel, and keep stirring the mixture, and raise the temperature to 170°C. At this time, about 1 mole of water was separated. Infrared spectrum shows that at this time at 1630cm -1 and 1550cm -1 There is an amide absorption peak at 3315cm -1 There is an N-H absorption peak in the free state. Then continue to heat up to 220°C and react for 3 hours. Formation of ...

Embodiment 2

[0048] First, industrial linolenic acid and diethylenetriamine are reacted in the reactor at a molar ratio of 2:1.2, and the linolenic acid is heated to 50°C under the condition of nitrogen, and then quickly added dropwise through a separatory funnel, and The mixture was kept stirring, and the temperature was raised to 160°C. At this time, about 1 mole of water was separated, and then the temperature was continued to rise to 225°C, and the reaction was carried out for 3 hours to generate amide imidazoline. Infrared spectrum shows that there is a characteristic absorption peak of imidazoline at 1610cm-1, the mass of the product is calculated according to the yield, and mercaptopropionic acid is added to the product with a molar ratio of 1:1.1, and the reaction is continued at 130°C for 4 Hours, sulfur-containing imidazoline derivatives are generated.

[0049] Compound the final reaction product with additives to form a corrosion inhibitor product. The formula is: 50% final pro...

Embodiment 3

[0060] First, sulfonated castor oil and tetraethylenepentamine are reacted in the reactor at a molar ratio of 2:2.5, and the linolenic acid is heated to 70°C under the condition of nitrogen, and then quickly added dropwise through a separatory funnel. And the mixture was kept stirring, and the temperature was raised to 175°C, at this time, about 1 mole of water was separated, and then the temperature was continued to rise to 225°C, and the reaction was carried out for 3 hours to generate sulfonated imidazoline. The infrared spectrum shows that there is a characteristic absorption peak of imidazoline at 1610cm-1, and the quality of the product is calculated according to the yield, and acrylic acid is added to the product with a molar ratio of 1:1.2, and the reaction is continued at 125°C for 4 hours. Generate sulfur-containing imidazoline derivatives.

[0061] Compound the final reaction product with additives to form a corrosion inhibitor product. The formula is: 45% final pr...

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Abstract

This invention relates to a method for preparing corrosion inhibitor for corrosion protection of metal pipelines and apparatuses in highly acidic gas fields. The corrosion inhibitor is composed of sulfur-containing imidazoline derivative 25-50%, additive 5-10, surfactant 5-10, and solvent oil 30-55. The corrosion inhibitor has high film-forming ability, and the formed film has durability as long as 240 h. The corrosion inhibitor can be applied on the surfaces of A3 carbon steel, 20# pipeline steel, L245 pipeline steel and L360 pipeline steel by batch treatment or intermittent filling. The corrosion inhibitive rate is greater than or equal to 90%. Besides, the corrosion inhibitor also has good corrosion inhibitive effects on the surfaces of metal tubes and casings in downhole in VM80SS, VM110SS and NT80SS oil and gas wells. The corrosion inhibitive rate is greater than or equal to 90%.

Description

technical field [0001] The invention relates to a corrosion inhibitor used for corrosion protection of metal pipelines and equipment in the production of oil and gas fields, especially high acid gas fields, and a preparation method thereof. Background technique [0002] The inventor has carried out a large amount of document retrieval work to background technology at home and abroad. For example, the typical domestic patent CN1277240, this patented corrosion inhibitor is a product composed of imidazoline sulfur-containing derivatives, alkyl phosphates, acetylenic alcohols, nonionic surfactants and solvents. It is also used for corrosion protection of oil wells with high carbon dioxide content and high salinity, but it is different from the structure of the present invention, and there is no system for high hydrogen sulfide-high carbon dioxide-high salinity in the application field. The duration was also not reported in detail. Therefore, the present invention is different ...

Claims

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Application Information

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IPC IPC(8): C23F11/173
CPCC23F11/163C23F11/16
Inventor 谷坛胡永碧唐永帆刘志德黄黎明杨仲熙黄瑛王坚常宏岗余华利李国浩曹军
Owner PETROCHINA CO LTD
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