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A kind of benzimidazoline corrosion inhibitor prepared from refined waste oil

A technology of benzimidazoline and corrosion inhibitor, which is applied in the field of benzimidazoline corrosion inhibitor, to achieve the effect of increasing metal corrosion resistance, increasing hydrophobicity, and reducing metal corrosion rate

Active Publication Date: 2018-03-09
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the preparation of benzimidazoline corrosion inhibitors using refined waste oil as raw materials.

Method used

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  • A kind of benzimidazoline corrosion inhibitor prepared from refined waste oil
  • A kind of benzimidazoline corrosion inhibitor prepared from refined waste oil
  • A kind of benzimidazoline corrosion inhibitor prepared from refined waste oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In a three-necked flask equipped with a water separator, a thermometer, a condenser and a stirring device, add 20g of refined waste oil, 25.0g of O-phenylenediamine and 60ml of xylene, introduce nitrogen, slowly heat to 140°C, react for 3.5~4.0h, gradually heat up to 150~160°C, after distilling out the xylene solvent, remove the water separator, change it to a vacuum distillation device, and control the pressure Under 200mmHg, the reaction was stirred at 175-180°C for 2-2.5h, water and excess reactants were continuously evaporated, and then the system pressure was gradually reduced to 20mmHg, and the constant temperature reaction was continued for 1.0-1.5h until the reaction During the process, no low-boiling point liquid evaporates. After the product is cooled, add 80 ml of 10% NaCl aqueous solution to the mixed product and stir evenly. Heat the mixture to 80 °C and keep it for 1 h. Cool and stand for 2.5 h, and separate it with a separatory funnel. The upper oily subs...

Embodiment 2

[0032] In a three-necked flask equipped with a water separator, a thermometer, a condenser and a stirring device, add 30g of refined waste oil, 39g of N-methyl-o-phenylenediamine and 70ml of xylene, introduce nitrogen, and slowly heat at 140°C for reflux reaction for 6.5 After h, under 190~200mmHg, under reduced pressure distillation for 2.5~3h, then under 20~25mmHg, under reduced pressure distillation for 1~2h, until no liquid flows out, after cooling, add 110ml of 10% NaCl aqueous solution to the mixture and Stir evenly, heat the mixture to 80°C and keep it for 1 h, cool and stand for 2.0 h, separate the upper oily substance with a separatory funnel, wash twice with water, separate the water layer, and dry the oily phase in vacuo to obtain a paste-like oil-soluble fatty base Corrosion inhibitor for N-methylbenzimidazoline, weighing 48.3g. Infrared spectrum (KBr): 1636, 1550, 1450cm -1 (Stretching vibration of benzene ring skeleton); 1575, 1455, 1410 cm -1 (Stretching vibra...

Embodiment 3

[0034] In a three-necked flask equipped with a water separator, a thermometer, a condenser and a stirring device, 30g of refined waste oil, 43.5g of N-phenyl-o-phenylenediamine and 80ml of xylene were added, nitrogen was introduced, and the reaction was slowly heated at 140°C for reflux. After 6.5h, under the condition of 190~200mmHg, under reduced pressure distillation for 2.5~3h, then under 20~25mmHg, under reduced pressure distillation for 1~2h, until no liquid flows out, after cooling, add 120ml of 10% NaCl aqueous solution to the mixture And stir evenly, heat the mixture to 80 °C and keep it for 1 h, cool and stand for 1.5 h, separate the upper oily substance with a separatory funnel, wash with water twice, separate the water layer, and dry the oily phase under vacuum to obtain oil-soluble aliphatic N -Phenylbenzimidazoline paste solid corrosion inhibitor, weighing 49.8g. Infrared spectrum (KBr): 1635, 1545, 1451cm -1 (Stretching vibration of benzene ring skeleton); 1568...

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Abstract

The invention relates to the technical field of metal corrosion inhibition, and specifically discloses a benzimidazolium corrosion inhibitor prepared from refined waste oil, whose chemical formula is as follows: wherein, R=C16-20 saturated alkyl or unsaturated alkyl; R1 =H, CH3, C6H5. The corrosion inhibitor introduces saturated alkyl groups and unsaturated alkyl groups or phenyl groups with different chain lengths into the benzimidazole molecule, which not only increases the density of the π electron cloud that can coordinate with the metal in the molecule, but also increases the protective film Hydrophobicity, which greatly reduces the metal corrosion rate and increases the metal corrosion resistance. The corrosion inhibitor is an oil-soluble product and can be used as a corrosion inhibitor in oilfield pipeline anticorrosion and industrial pickling. It can be used on metal surfaces A tight and firm adsorption film is formed on the surface, which reduces the metal corrosion rate and achieves the purpose of metal anticorrosion.

Description

technical field [0001] The invention relates to the technical field of metal corrosion inhibition, and more particularly, to a benzimidazoline corrosion inhibitor prepared by using refined waste oil. Background technique [0002] In the process of oil and gas well exploitation and industrial thermal equipment pickling, in order to prevent acid from corroding oil pipes, casings, boilers and other equipment, it is an essential anti-corrosion measure to add corrosion inhibitors to acid. It is especially widely used in oilfield pipeline anticorrosion. At present, the synthesis of benzimidazoline is mainly based on organic carboxylic acid and substituted o-phenylenediamine as raw materials, using step heating technology, through amidation and cyclodehydration. However, there are few reports on the preparation of benzimidazoline corrosion inhibitors using refined waste oil as raw material. SUMMARY OF THE INVENTION [0003] The technical problem to be solved by the present inven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D235/04
Inventor 袁斌胡微吕松
Owner GUANGDONG UNIV OF TECH
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