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Preparation method of 1,2-diaminopropane 5-fluorosalicylaldehyde double-Schiff base corrosion inhibitor

A technology of fluorosalicylaldehyde and bis-Schiff base, which is applied in the field of organic synthesis, can solve the problems that the Schiff base corrosion inhibitor is not perfect and mature, and achieve good effect, simple process and high yield

Inactive Publication Date: 2019-01-04
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 5-fluorosalicylaldehyde double-Schiff base corrosion inhibitor
  • Preparation method of 1,2-diaminopropane 5-fluorosalicylaldehyde double-Schiff base corrosion inhibitor
  • Preparation method of 1,2-diaminopropane 5-fluorosalicylaldehyde double-Schiff base corrosion inhibitor

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Embodiment

[0022] The specific steps for preparing the above-mentioned 1,2-propylenediamine condensed 5-fluorosalicylaldehyde bis-Schiff base corrosion inhibitor are:

[0023] (1) Measure 1.0508 g of 5-fluorosalicylaldehyde into a round-bottomed flask filled with 15 mL of absolute ethanol, and stir evenly with magnetic force.

[0024] (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, nitrogen gas throughout the process Protected reaction for 6 hours,.

[0025] (3) Cool the resultant of step (1) at room temperature, a large amount of light yellow crystals precipitated, filtered under reduced pressure, rinsed continuously with absolute ethanol, took out the filter cake, and vacuum-dried the filter cake.

[0026] (4) put step (1) gained filter cake in the beaker that 40mL dehydrated alcohol...

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Abstract

The invention discloses a preparation method of a 1,2-diaminopropane 5-fluorosalicylaldehyde double-Schiff base corrosion inhibitor. The method includes the steps of firstly, weighing 1.0508g of 5-fluorosalicylaldehyde, 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 glacial acetic acid, performing magnetic 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, 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 5-fluorosalicylaldehyde double-Schiff base corrosion inhibitor applicable to 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 corrosion inhibition 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-propylenediamine 5-fluorosalicylaldehyde 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 ...

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Application Information

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