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Schiff base, as well as preparation and applications of Schiff base as pickling inhibitor for steel products

A Schiff base and steel technology, applied in the preparation of imino compounds, organic chemistry, etc., can solve the problems of the urgency to find new corrosion inhibitors, the toxic effects of the environment and life systems, etc. Simple method and simple preparation

Inactive Publication Date: 2013-02-13
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic corrosion inhibitors achieve the purpose of corrosion inhibition by forming a film on the surface of metal materials. However, most organic corrosion inhibitors are toxic to the environment and life systems. Therefore, it is urgent to find new corrosion inhibitors.

Method used

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  • Schiff base, as well as preparation and applications of Schiff base as pickling inhibitor for steel products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) Preparation of Schiff base. Dissolve 0.35g (2mmol) p-aminobenzenesulfonic acid and 0.08g (2mmol) NaOH solid in 15mL of anhydrous methanol to obtain solution A, and dissolve 0.134g (1mmol) terephthalaldehyde in 10mL of anhydrous methanol to obtain solution B Mix the two solutions of A and B in a round-bottomed flask, stir and reflux in a water bath at 40°C for 5 hours; then distill off half of the solvent from the mixture in the flask under reduced pressure, and obtain a light yellow powdery crude product after filtration and separation. The product was recrystallized in absolute ethanol to obtain the final product. Products and raw materials were characterized by potassium bromide tablet infrared spectroscopy, and the results are listed in the following table (cm -1 ):

[0016]

[0017] The data in the table shows that the carbonyl group (C=O) of terephthalaldehyde is transformed into the imino group (C=N) in the Schiff base, and the sulfonic acid group (SO 3 ...

Embodiment 2

[0020] 1) Preparation of Schiff base. Dissolve 0.38g (2.2mmol) of p-aminobenzenesulfonic acid and 0.088g (2.2mmol) of NaOH solid in 15mL of anhydrous methanol to obtain solution A, and dissolve 0.134g (1mmol) of terephthalaldehyde in 10mL of anhydrous methanol to obtain Solution B: Mix the two solutions of A and B in a round bottom flask, stir and reflux in a water bath at 60°C for 2 hours; then distill the mixture in the flask under reduced pressure to remove half of the solvent, and obtain a light yellow powder after filtration and separation The crude product was recrystallized in anhydrous methanol to obtain the final product Schiff base. The product was characterized by potassium bromide tablet infrared spectroscopy, and the obtained result was the same as that in Example 1, which proved that the Schiff base of the present invention was successfully synthesized.

[0021] 2) Corrosion inhibition performance testing. The corrosion inhibition performance detection of the S...

Embodiment 3

[0023] 1) Preparation of Schiff base. Dissolve 0.365g (2.1mmol) of p-aminobenzenesulfonic acid and 0.084g (2.1mmol) of NaOH solid in 15mL of absolute ethanol to obtain solution A, and dissolve 0.134g (1mmol) of terephthalaldehyde in 10mL of absolute ethanol to obtain Solution B: Mix the two solutions in a round bottom flask, stir and reflux in a water bath at 60°C for 5 hours; then distill the mixture in the flask under reduced pressure to remove half of the solvent, and obtain a light yellow powdery crude product after filtration and separation , recrystallized in absolute ethanol to obtain the final product Schiff base. The product was characterized by potassium bromide tablet infrared spectroscopy, and the obtained result was the same as that in Example 1, which proved that the Schiff base of the present invention was successfully synthesized.

[0024] 2) Corrosion inhibition performance testing. The addition amount of described Schiff's base is 0.049g, and other detectio...

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Abstract

The invention relates to a Schiff base, as well as a preparation method and applications of the Schiff base as a steel pickling inhibitor for steel products. Particularly, the Schiff base is prepared through condensation of p-phthalaldehyde and sulfanilic acid under the action of the base, and the Schiff base can prevent corrosion of the steel products caused by the acid solution during the pickling process and unnecessary consumption of the acid solution. When the Schiff base concentration is 0.49-2.4g / L in the pickling solution with a hydrochloric acid concentration of 1.0mol / L, the inhibition effect on the steel products is obvious. The Schiff base provided by the invention has simple preparation precess and available and cheap raw materials, and is soluble in water. When used as the inhibitor, the Schiff base has the advantages of simple using method, low dosage, strong continuous-effect of inhibition and the like.

Description

technical field [0001] The invention relates to a Schiff base and its preparation method and its application as a corrosion inhibitor during pickling of steel products. The obtained Schiff base, its preparation method and its application as a corrosion inhibitor during pickling of steel products. Background technique [0002] Schiff bases are a class of compounds containing C=N double bonds formed by the condensation of compounds containing primary amino groups and compounds containing carbonyl groups. Generally, the reaction mechanism for the preparation of Schiff bases is: use amine compounds as nucleophiles to carry out nucleophilic addition reactions with carbonyl-containing ketones or aldehydes, and the nitrogen atoms with lone pairs of electrons in their structures attack the carbonyl groups. A positively charged carbon atom completes a nucleophilic addition reaction to form an intermediate α-hydroxylamine compound, which is further dehydrated to form a Schiff base. ...

Claims

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Application Information

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IPC IPC(8): C07C251/24C07C249/02C23G1/06C23G1/08
Inventor 曾巨澜朱芙蓉邓光荣王娜娜肖忠良张玲曹忠
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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