Benzimidazoline corrosion inhibitor prepared from refined swill-cooked dirty 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: 2015-11-25
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 benzimidazol

Method used

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  • Benzimidazoline corrosion inhibitor prepared from refined swill-cooked dirty oil
  • Benzimidazoline corrosion inhibitor prepared from refined swill-cooked dirty oil
  • Benzimidazoline corrosion inhibitor prepared from refined swill-cooked dirty 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 O-phenylenediamine and 60ml of xylene, feed nitrogen, slowly heat to 140°C, react for 3.5-4.0h, gradually raise the temperature to 150-160°C, after the xylene solvent is evaporated, remove the water separator, change to a vacuum distillation device, and control the pressure Under 200mmHg, stir and react at 175-180°C for 2-2.5h, water and excess reactants are continuously evaporated, then the system pressure gradually drops to 20mmHg, and then continue to react at constant temperature for 1.0-1.5h until the reaction During the process, until no low-boiling point liquid evaporates, after the product is cooled, add 80ml of 10% NaCl aqueous solution to the mixed product and stir evenly, heat the mixture to 80°C and keep it warm for 1h, cool and stand for 2.5h, and separate with a separatory funnel The oil in the upper layer was washe...

Embodiment 2

[0032] Add 30g of refined waste oil, 39g of N-methyl-o-phenylenediamine and 70ml of xylene into a three-necked flask equipped with a water separator, thermometer, condenser and stirring device, blow in nitrogen, and slowly heat to reflux at 140°C for 6.5h Finally, at 190-200mmHg, distill under reduced pressure for 2.5-3h, then at 20-25mmHg, distill under reduced pressure 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 warm for 1h, cool and stand for 2.0h, separate the upper layer oil with a separatory funnel, wash with water twice, separate the water layer, and vacuum dry the oil phase to obtain a creamy oil-soluble fat-based N -Corrosion inhibitor of methyl benzimidazoline, weighing 48.3 g. Infrared spectrum (KBr): 1636, 1550, 1450cm -1 (Stretching vibration of benzene ring skeleton); 1575, 1455, 1410cm -1 (stretching vibration of imidazoline ring skeleton); 2868,...

Embodiment 3

[0034] In a three-necked flask equipped with a water separator, a thermometer, a condenser and a stirring device, add 30g of refined waste oil, 43.5g of N-phenyl-o-phenylenediamine and 80ml of xylene, feed nitrogen, and slowly heat to reflux at 140°C for 6.5 After h, distill under reduced pressure at 190-200 mmHg for 2.5-3 h, then distill under reduced pressure at 20-25 mmHg for 1-2 h until no liquid flows out. After cooling, add 120 ml of 10% NaCl aqueous solution to the mixture and Stir evenly, heat the mixture to 80°C and keep it warm for 1 hour, cool it and let it stand for 1.5 hours, separate the upper layer oil with a separatory funnel, wash it with water twice, separate the water layer, and dry the oil phase in vacuum to obtain the oil-soluble fat-based N- Phenylbenzimidazoline paste solid corrosion inhibitor, weighing 49.8g. Infrared spectrum (KBr): 1635, 1545, 1451cm -1 (stretch vibration of benzene ring skeleton); 1568, 1445, 1410cm -1 . 2875, 2891cm -1 (CH 3 ,C...

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Abstract

The invention relates to the technical field of metal corrosion inhibition and particularly discloses a benzimidazoline corrosion inhibitor prepared from refined swill-cooked dirty oil, of which the chemical formula is as shown in the description, wherein R=C(16-20) saturated alkyl or unsaturated alkyl; and R1=H, CH3 and C6H5. The corrosion inhibitor is obtained in the way that saturated alkyl and unsaturated alkyl or phenyl, of different chain lengths, are added into benzimidazole molecules, so that the hydrophobicity of a protective film is improved while the density of pi electron cloud, capable of being coordinated with metals, in the molecules is increased, accordingly, the metal corrosion rate is greatly reduced, and the metal anticorrosiveness is increased. The corrosion inhibitor is an oil-soluble product, can be used for corrosion protection of oil field pipelines and industrial pickling, can form a compact and firm adsorption film on a metal surface, reduces the metal corrosion rate and achieves the purpose of metal corrosion protection.

Description

technical field [0001] The invention relates to the technical field of metal corrosion inhibition, in particular to a benzimidazoline corrosion inhibitor prepared from refined waste oil. Background technique [0002] In the process of oil and gas well mining and pickling of industrial thermal equipment, in order to prevent the acid liquid from corroding oil pipes, casings, boilers and other equipment, adding corrosion inhibitors to the acid liquid is an essential anti-corrosion measure. Now imidazoline corrosion inhibitors Agents are 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, and is prepared by amidation and cyclodehydration by step heating technology. However, there are few reports on the preparation of benzimidazoline corrosion inhibitors using refined waste oil as raw materials. Contents of the invention [0003] The technica...

Claims

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Application Information

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IPC IPC(8): C23G1/06C23F11/14
Inventor 袁斌胡微吕松
Owner GUANGDONG UNIV OF TECH
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