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Compound Corrosion Inhibitor for Inhibiting Dissolved Oxygen Corrosion and Its Preparation and Application

A corrosion inhibitor and dissolved oxygen technology, applied in the field of oilfield chemistry, can solve the problems of easy pollution to the environment, poor corrosion inhibition effect, poor water solubility, etc., to achieve no emulsification tendency, inhibit dissolved oxygen corrosion, and water solubility Good results

Active Publication Date: 2020-06-05
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Although the prior art has a variety of corrosion inhibitors for inhibiting dissolved oxygen corrosion, the corrosion inhibitors are not good, the water solubility is not good, poisonous, and factors such as easy pollution to the environment have affected the popularization and application of corrosion inhibitors. Therefore, in this field It is urgent to develop a new type of corrosion inhibitor for inhibiting dissolved oxygen corrosion with excellent corrosion inhibition effect, good water solubility, non-toxicity, and no environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In the reaction vessel, add 50g of water, 5g of zinc sulfate, and 5g of sodium molybdate. Heat up to 60°C and keep stirring. After mixing evenly, add 10g of N-lauric acid sarcosine, 30g of fatty alcohol polyoxyethylene ether phosphate AEO-3P (CAS: 9002-92-0), under constant temperature conditions, continue to stir for 1 hour until the solution is uniform, that is, the composite corrosion inhibitor of this embodiment for inhibiting corrosion is obtained.

Embodiment 2

[0035] In the reaction vessel, add 54g of water, 3g of sodium pyrophosphate, and 3g of sodium molybdate. Heat up to 60°C and keep stirring. After mixing well, add 20g of N-lauric sarcosine, 20g of fatty alcohol polyoxyethylene ether phosphate AEO- 3P (CAS: 9002-92-0), under constant temperature conditions, continue to stir for 1.5 hours until the solution is uniform, that is, the composite corrosion inhibitor of this embodiment for inhibiting dissolved oxygen corrosion is obtained.

Embodiment 3

[0037] In the reaction vessel, add 44g of water, 3g of zinc sulfate, and 3g of sodium molybdate. Heat up to 60°C and keep stirring. After mixing evenly, add 30g of N-lauric acid sarcosine, 20g of fatty alcohol polyoxyethylene ether phosphate AEO-3P (CAS: 9002-92-0), under constant temperature conditions, continue to stir for 1.5 hours until the solution is uniform, that is, the composite corrosion inhibitor for inhibiting dissolved oxygen corrosion in this embodiment is obtained.

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PUM

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Abstract

The invention provides a compounded corrosion inhibitor capable of inhibiting dissolved oxygen corrosion and a preparation method and application thereof. The compounded corrosion inhibitor comprises10-50 wt.% of acyl sarcosine or a derivative of the acyl sarcosine, 10-30 wt.% of a surface active agent, 2-10 wt.% of molybdate, 0-10 wt.% of zinc salt, 0-10 wt.% of phosphate and the balance water,and the total amount is 100%. The corrosion inhibitor is compounded by organic components and inorganic components, dissolved oxygen corrosion can be effectively inhibited through the synergistic inhibition effect of an organic corrosion inhibitor and an inorganic corrosion inhibitor, the compounded corrosion inhibitor is good in water solubility, free of emulsification tendency and non-poisonous,can be applied to an oil field system to prevent dissolved oxygen corrosion, is low in cost and environmentally friendly, and the addition amount is small.

Description

technical field [0001] The invention relates to a corrosion inhibitor and its preparation method and application, in particular to a composite corrosion inhibitor for inhibiting dissolved oxygen corrosion, its preparation method and application, and belongs to the technical field of oil field chemistry. Background technique [0002] The metal equipment in the industrial cooling water and oil field injection and return water system, such as various heat exchangers, pumps, valves, pipelines, oil casings and storage tanks, etc., are perforated due to the corrosion of cooling water and oil field sewage . Oxygen depolarization corrosion is the main cause of this type of corrosion. [0003] The corrosion cell reaction principle of carbon steel in cooling water or oil field sewage is generally as follows: [0004] Anode reaction Fe→Fe 2+ +2e - ; [0005] Cathode reaction O 2 +2H 2 O→4OH - ; [0006] Total reaction 2Fe+2H 2 O+O 2 →2Fe(OH) 2 ↓ [0007] The ferrous hydrox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/08
CPCC23F11/08
Inventor 于浩波何洋陈长风于延钊姜瑞景
Owner CHINA UNIV OF PETROLEUM (BEIJING)