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Sulfur-containing bis-imidazoline type carbon dioxide corrosion inhibitor and preparation method thereof

A technology of bis-imidazoline and carbon dioxide, applied in earthwork drilling, organic chemistry, wellbore/well parts, etc., can solve problems such as poor water solubility, layered precipitation, and influence on the use of chemicals, and achieve good water solubility and good protection The effect of action

Inactive Publication Date: 2012-01-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Commonly used imidazoline and amide corrosion inhibitors are generally poor in water solubility. Even if water solubility modification or optimization (such as quaternization, etc.) It is often incompatible with organic phosphoric acid scale inhibitors, salt inhibitors and other oil and gas field chemical additives, and it is easy to cause layered precipitation and other phenomena, which seriously affects the use effect of various chemicals

Method used

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  • Sulfur-containing bis-imidazoline type carbon dioxide corrosion inhibitor and preparation method thereof
  • Sulfur-containing bis-imidazoline type carbon dioxide corrosion inhibitor and preparation method thereof
  • Sulfur-containing bis-imidazoline type carbon dioxide corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add sebacic acid and diethylenetriamine with a molar ratio of 1.0:1.5 into the reactor in a certain order, and raise the temperature to 110°C under stirring conditions. At this time, liquid separates and keeps reflux for 1h; then raise the temperature to 140°C, Reflux for 3 hours for amidation reaction; continue to heat up to 260°C and reflux for 3 hours for cyclization reaction to obtain a bis-imidazoline intermediate;

[0033] Lower the temperature of the reactant to 70°C, add thiourea according to the molar ratio of polyamine:thiourea=1.0:1.5, then raise the temperature to 100°C, and continue the reaction for 3 hours to obtain a brown-yellow uniform viscous liquid, which is the target product - sulfur-containing bis-imidazoline compounds.

[0034] The contents are: sulfur-containing bisimidazoline: 30% by weight, OP-10: 3% by weight, methanol: 62% by weight, propynyl alcohol: 5% by weight, mixed with each other, and stirred evenly.

[0035]

Embodiment 2

[0037] Add adipic acid and triethylenetetramine with a molar ratio of 1.0:1.7 into the reactor in a certain order, and raise the temperature to 120°C under stirring conditions. At this time, liquid separates, and keep reflux for 1.4h; then raise the temperature to 160°C , reflux for 3h for amidation reaction; continue to heat up to 260°C and reflux for 4.5h for cyclization reaction to obtain a bis-imidazoline intermediate.

[0038] Reduce the temperature of the reactant to 85°C, add thiourea, then raise the temperature to 130°C, and continue the reaction for 4 hours to obtain a brown-yellow homogeneous viscous liquid, which is the target product-sulfur-containing bis-imidazoline compound.

[0039] The contents are: sulfur-containing bis-imidazoline: 35% by weight, OP-10: 1% by weight, methanol: 46% by weight, propynyl alcohol: 10% by weight, mixed with each other, and stirred evenly.

[0040]

Embodiment 3

[0042] Add sebacic acid and tetraethylenepentamine with a molar ratio of about 1.0:2.05 into the reactor in a certain order, and raise the temperature to 135°C under stirring conditions. At this time, liquid separates and keeps reflux for 1.8h; °C, reflux for 3 hours for amidation reaction; continue to heat up to 260 °C and reflux for 6 hours for cyclization reaction to obtain a bis-imidazoline intermediate.

[0043] Lower the temperature of the reactant to 90°C, add mercaptan according to the molar ratio of polyamine:thiol = 1.0:1.7, then raise the temperature to 145°C, and continue the reaction for 5 hours to obtain a brown-yellow uniform viscous liquid, which is the target product - sulfur-containing bis-imidazoline compounds.

[0044] The content is: sulfur-containing bisimidazoline: 20% by weight, OP-10: 3.5% by weight, methanol: 70% by weight, propynyl alcohol: 6.5% by weight, mixed with each other, and stirred evenly

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Abstract

The invention discloses a sulfur-containing bis-imidazoline type carbon dioxide corrosion inhibitor and a preparation method thereof. The corrosion inhibitor comprises the following components in percentage by weight: 20-50 percent of sulfur-containing bis-imidazoline quaternary ammonium salt, 1-5 percent of nonionic surfactant, 40-70 percent of low molecular alcohol solvent and 5-10 percent of alkynol, wherein a sulfur-containing bis-imidazoline compound has a general formula of a structure which is shown in the specification; the number of carbon atoms in R of the formula is 5 or 8; the nonionic surfactant is fatty alcohol-polyoxyethylene ether or alkylphenol ethoxylate; the low molecular alcohol solvent is methanol, ethanol, isopropanol or ethylene glycol; and the alkynol is propargyl alcohol or hexynol. In the invention, the sulfur-containing bis-imidazoline compound which is generated through dehydration between dicarboxylic acid and polyamine molecule, dehydration reaction in the molecule and further reaction with the sulfur-containing compound is adopted; the molecule contains a plurality of active adsorption centers such as two diazo five-membered heterocyclic rings, a sulfur-containing group and the like; and a formed organic adsorption membrane has better protection effect on carbon steel.

Description

technical field [0001] The invention relates to a sulfur-containing bisimidazoline carbon dioxide corrosion inhibitor and a preparation method thereof. Background technique [0002] In the process of oil and gas exploitation, oil and gas well corrosion basically involves all types of corrosion, but H 2 S corrosion and CO 2 Corrosion is the most prevalent form of corrosion encountered in oil and gas wells. Dosing corrosion inhibitors is an effective corrosion protection measure, especially in high CO 2 、H 2 During the exploitation of acidic oil and gas such as S, corrosion inhibitors are used to prevent and control acid gas corrosion damage. [0003] At present, the corrosion inhibitors used at home and abroad are basically adsorption corrosion inhibitors, such as chain organic amines and their derivatives, imidazoline and its salts or imidazoline derivatives quaternary ammonium salts, rosin amine derivatives; others Organic compounds (sulfonates, iminoacetic acid deriva...

Claims

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Application Information

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IPC IPC(8): C09K8/54C07D233/16
Inventor 黄金营路民旭柳伟吴伟平
Owner UNIV OF SCI & TECH BEIJING
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