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Mannich base acidifying corrosion inhibitor and preparation method thereof

A Mannich base, acidizing corrosion inhibitor technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of amino hydroxy compounds, etc., can solve the problems of poor solubility, poor compactness of protective film, easy volatility, etc. The adsorption strength and compactness, the corrosion inhibition effect is obviously improved, and the acidification cost is reduced.

Inactive Publication Date: 2012-10-24
天津中油科远石油工程有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Formaldehyde has a low molecular weight, and the formed protective film has poor compactness, and is volatile and dangerous; the Mannich base acidification corrosion inhibitor synthesized from secondary amines has poor solubility, especially when the temperature is higher than 90 ° C, it is in the acid solution Easily cloudy

Method used

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  • Mannich base acidifying corrosion inhibitor and preparation method thereof
  • Mannich base acidifying corrosion inhibitor and preparation method thereof
  • Mannich base acidifying corrosion inhibitor and preparation method thereof

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preparation example Construction

[0023] The preparation method of the Mannich base acidification slow-release agent of the present invention is characterized in that, pour dodecyl dimethyl tertiary amine, paraformaldehyde and aromatic ketone into the reaction kettle according to the material ratio, add ethanol as a solvent, Then slowly add hydrochloric acid to adjust the pH value of the reaction solution, then slowly raise the temperature to 80±5°C, keep the temperature at reflux for 5 to 7 hours, and obtain the Mannich base:

[0024]

[0025] Its reaction equation is as follows:

[0026]

[0027] The Mannich base ( )

[0028] It is compounded with acetic acid, propynyl alcohol and potassium iodide at a weight ratio of 6:2.5:0.5:1 to obtain a finished Mannich base acidifying corrosion inhibitor; in the formula: n=8~100.

[0029] The preparation method of the Mannich base acidified sustained-release agent of the present invention, wherein, the paraformaldehyde is a linear polymer of formaldehyde, its ...

Embodiment

[0031] 1. Raw materials

[0032] (1) Paraformaldehyde

[0033] Paraformaldehyde, also known as paraformaldehyde, solid formaldehyde, or polymerized formaldehyde, is a linear polymer of formaldehyde, with a structural formula of (HCHO)n, a molecular weight of (30)n, and n=8 to 100.

[0034] (2) Aromatic ketones

[0035] This embodiment selects acetophenone molecular formula as C 8 h 8 o

[0036] (3) Dodecyldimethyl tertiary amine

[0037] Molecular formula: C 12 h 25 N(CH 3 ) 2

[0038] 2. Ratio of materials (parts by weight)

[0039] Acetophenone: dodecyldimethyl tertiary amine: paraformaldehyde = 1:1:1

[0040] 3. Synthesis conditions

[0041] Pour dodecyldimethyl tertiary amine, paraformaldehyde and acetophenone into the reaction kettle according to the material ratio, add ethanol with 15% of the total weight of the material as a solvent, slowly add 43% of the total weight of hydrochloric acid, hydrochloric acid The concentration is 15%, adjust the pH value, slo...

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Abstract

The invention provides a Mannich base acidifying corrosion inhibitor and a preparation method thereof. The molecular general formula of the Mannich base acidifying corrosion inhibitor is as follows. The preparation method comprises the following steps: proportionally pouring dodecyl dimethyl tertiary amine, polyformaldehyde and aromatic ketone into a reaction kettle, adding an ethanol solvent, slowly adding hydrochloric acid to regulate the pH value of the reaction solution, heating to 80+ / -5 DEG C, and refluxing for 5-7 hours while keeping the temperature, thereby obtaining the Mannich base; and compounding the Mannich base, acetic acid, propiolic alcohol and potassium iodide in a weight ratio of 6:2.5:0.5:1 to obtain the finished Mannich base acidifying corrosion inhibitor product. The existing raw materials for synthesizing the Mannich base acidifying corrosion inhibitor are changed to enhance the adsorption strength and compactness of the corrosion inhibitor protective film, thereby enhancing the corrosion inhibition effect of the acidifying corrosion inhibitor and lowering the acidifying operation cost.

Description

technical field [0001] The invention relates to an acidification corrosion inhibitor, in particular to a Mannich base acidification corrosion inhibitor and a preparation method thereof. Background technique [0002] Acidizing corrosion inhibitor is an additive for oil well acidizing operations, used to protect pipelines and equipment, and avoid corrosion of pipelines and equipment. [0003] At present, there are mainly three types of acidifying corrosion inhibitors, one is imidazoline, the other is alkynyloxymethylamine, and the third is Mannich base. The first two types of acidifying corrosion inhibitors have poor corrosion inhibition effects and can only be used in environments where the temperature does not exceed 60 °C. Mannich base acidification corrosion inhibitor has good corrosion inhibition effect. It is used in the environment above 90 °C, and the dosage is relatively large. The mass percentage in the acid liquid needs to be more than 2%, which increases the cost ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54C08G2/30C07C217/08C07C213/00
Inventor 赵常龙朱烨陈志军陈杰赵华
Owner 天津中油科远石油工程有限责任公司
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