Compound corrosion inhibitor applicable to sewage medium and preparation method thereof

A corrosion inhibitor and compounding technology, which is applied in the field of compound corrosion inhibitor and its preparation, can solve the problems of poor biodegradability, environmental pollution, and no evaluation of corrosion inhibition effect, and achieve excellent corrosion inhibition effect , good water solubility, excellent corrosion inhibition effect

Active Publication Date: 2014-08-20
濮阳市万良石油科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional corrosion inhibitors not only have poor biodegradability, but also pollute the environment
Corrosion inhibitors based on linseed oil have been reported in the literature "Metal Surface Protective Coating Evaluation and Corrosion I...

Method used

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  • Compound corrosion inhibitor applicable to sewage medium and preparation method thereof
  • Compound corrosion inhibitor applicable to sewage medium and preparation method thereof
  • Compound corrosion inhibitor applicable to sewage medium and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The present invention proposes a method for preparing a composite corrosion inhibitor suitable for sewage corrosive media, which specifically includes the following steps:

[0034] Step 1: Synthesis of linseed oil amide.

[0035] In a 250ml four-necked bottle, linseed oil and triethylenetetramine are dissolved in xylene solvent at a molar ratio of 1:1–1:3, and the volume of xylene added to each mole of linseed oil is 20–40ml, and heated slowly under nitrogen protection To 100-150°C, add concentrated sulfuric acid catalyst at the same time, react at 100-150°C for 3-4 hours, the amount of the catalyst added is 0.1-0.5ml per mole of linseed oil, after the reaction, distill out distillate toluene. Cool down to room temperature.

[0036] A light yellow viscous liquid was obtained, soluble in water, with a purity of over 90%.

[0037] Among them, the raw material of linseed oil was purchased from Zhangjiakou Xinte Vegetable Oil Co., Ltd., and its main components are shown ...

Embodiment 2

[0049] The main difference between this embodiment and embodiment 1 lies in step 2, specifically:

[0050] Linseed oil amide, phosphonoglycolic acid, zinc sulfate heptahydrate, polyaspartic acid and isopropanol are mixed according to their mass fractions of 30%, 40%, 10%, 10% and 10%, respectively, to obtain Composite corrosion inhibitor.

[0051]The compound corrosion inhibitor obtained is added to the sewage solution according to the specific gravity of 0.02g of the compound corrosion inhibitor per 100g of sewage medium, and placed in the sewage solution with and without the compound corrosion inhibitor The carbon steel test piece was subjected to weight loss test according to the test method of China National Petroleum Corporation's enterprise standard Q / SY TZ0178-2007, soaked at 50°C for 4 days, and the weight loss results are shown in Table 2. After adding the corrosion inhibitor, the weight loss of carbon steel is significantly reduced, and the surface of carbon steel i...

Embodiment 3

[0055] The main difference between this embodiment and embodiment 1 lies in step 2, specifically:

[0056] Mix linseed oil amide, phosphonoglycolic acid, zinc sulfate heptahydrate, polyaspartic acid and isopropanol according to their mass fractions of 50%, 20%, 5%, 15% and 10%, respectively, to obtain Composite corrosion inhibitor.

[0057] The compound corrosion inhibitor obtained is added to the sewage solution according to the specific gravity of 0.1g of the compound corrosion inhibitor per 100g of sewage medium, and placed in the sewage solution with and without the compound corrosion inhibitor The carbon steel test piece was subjected to weight loss test according to the test method of China National Petroleum Corporation's enterprise standard Q / SY TZ0178-2007, soaked at 50°C for 4 days, and the weight loss results are shown in Table 3. After adding the corrosion inhibitor, the weight loss of carbon steel is significantly reduced, and the surface of carbon steel is very ...

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Abstract

The invention discloses a compound corrosion inhibitor prepared from the following raw materials by mass fraction: 30-50% of flax seed oil amide, 20-40% of phosphonic glycollic acid, 5-10% of heptahydrate, 10-20% of polyaspartic acid and 10-30% of isopropyl alcohol, wherein the sum of the components by percent is 100%. The compound corrosion inhibitor has the beneficial effects of low cost, environmental friendliness and good corrosion inhibition effect.

Description

technical field [0001] The invention belongs to the field of metal material corrosion and protection, and in particular relates to a composite corrosion inhibitor suitable for sewage medium and a preparation method thereof. Background technique [0002] Oilfield water flooding is affected by salinity of injected water, high chloride ion content, pH value, CO 2 Influenced by formation water and other factors, water injection corrosion has become a common concern of the majority of petroleum workers, and it has also become an important task to improve the operating life of pipeline equipment and reduce production costs. With the strengthening of the national environmental protection policy, people pay more and more attention to the research and development of new, efficient, low-toxic and environmentally friendly green corrosion inhibitors. [0003] Commonly used corrosion inhibitors include quaternary ammonium salts, nitrogen-containing heterocycles, imidazolines, Mannich ba...

Claims

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Application Information

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IPC IPC(8): C23F11/173
CPCC23F11/08
Inventor 陈宇张昭沈悦华江依义安长胜
Owner 濮阳市万良石油科技发展有限公司
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