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Preparation method of 1,2-diaminopropane o-vanillin double-Schiff base corrosion inhibitor

A technology of ortho-vanillin and bis-Schiff bases, applied in 1 field, can solve the problems of imperfect and mature Schiff base corrosion inhibitors, etc., and achieve good effect, high yield and good repeatability

Inactive Publication Date: 2019-01-04
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0008] (4) Schiff base corrosion inhibitors are not perfect and mature enough in practice

Method used

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  • Preparation method of 1,2-diaminopropane o-vanillin double-Schiff base corrosion inhibitor
  • Preparation method of 1,2-diaminopropane o-vanillin double-Schiff base corrosion inhibitor
  • Preparation method of 1,2-diaminopropane o-vanillin double-Schiff base corrosion inhibitor

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Embodiment

[0021] The specific steps for preparing the above-mentioned 1,2-propylenediamine adeno-vanillin bis-Schiff base corrosion inhibitor are:

[0022] (1) Measure 1.1411g of o-vanillin and place it in a round bottom flask filled with 15mL of absolute ethanol, and stir evenly with magnetic force.

[0023] (2) Add 0.1853g of analytically pure 1,2-propylenediamine and 0.15mL of analytically pure glacial acetic acid catalyst dropwise to the resultant of step (1), under constant temperature conditions of 65°C, magnetic stirring, reflux reaction for 6 hours, the whole process Nitrogen protection.

[0024] (3) Cool the solution obtained in step (2) at room temperature, a large amount of light yellow crystals are precipitated, filter under reduced pressure, continuously rinse with absolute ethanol, take out the filter cake, vacuum-dry the filter cake, and then put it into a In a beaker of 40mL of absolute ethanol, stir magnetically for 2 hours to remove excess o-vanillin, glacial acetic a...

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Abstract

The invention discloses a preparation method of a 1,2-diaminopropane o-vanillin double-Schiff base corrosion inhibitor. The method includes the steps of firstly, weighing 1.1411g of o-vanillin, placing into a round-bottom flask containing 15mL of anhydrous ethanol, and evenly stirring through magnetic stirring; secondly, adding 0.1853g of analytically pure 1,2-diaminopropane and 0.15mL of glacialacetic acid, stirring at 65 DEG C, and performing reflux reaction under nitrogen protection for 6 hours; thirdly, cooling under room temperature, performing reduced pressure suction filtration, constantly eluting with anhydrous ethanol, taking out filter cake, and performing vacuum drying on the filter cake; fourthly, placing the filter cake into a beaker containing 40mL of anhydrous ethanol, stirring, performing reduced pressure suction filtration, taking the filter cake, and performing vacuum drying to obtain the 1,2-diaminopropane o-vanillin double-Schiff base corrosion inhibitor applicableto the corrosion prevention of carbon steel in a pickling solution. The method is simple in process, good in repeatability and high in yield, and the prepared corrosion inhibitor is good in corrosioninhibition effect on the carbon steel in dilute sulfuric acid.

Description

technical field [0001] The invention relates to the field of organic synthesis, and relates to a preparation method of a bis-Schiff base corrosion inhibitor, in particular to a preparation method of a 1,2-propanediamine-o-vanillin bis-Schiff base corrosion inhibitor. Background technique [0002] The application of corrosion inhibitors for carbon steel has a history of more than 100 years. The research and application of corrosion inhibitors in China started in the 1950s with aniline-aldehyde condensation polymers, and began to develop rapidly after the 1970s. From the imitation of foreign Rodine and Nbit products to the formation of domestic quaternary ammonium salts (IMC), organic amines (SH), composite corrosion inhibitors (FH), Chuantian, 7081 and other series of corrosion inhibitor formulas, their technical performance has approached world advanced level. Some corrosion inhibitors have reached or surpassed similar foreign products in water treatment and acidification o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C251/24C07C249/02C23G1/06C23G1/08
CPCC07C249/02C23G1/068C23G1/081C07C251/24
Inventor 刘峥韩佳星梁楚欣李汝
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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