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Schiff-base waste cooking oil derivative corrosion inhibitor and preparation method and application thereof

A technology of catering waste oil and Schiff base, applied in the field of industrial pickling process, can solve the problems of economic loss of national economy, corrosion of carbon steel materials, etc.

Inactive Publication Date: 2020-02-07
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Carbon steel materials are extremely susceptible to corrosion by acid, chloride ions and other factors, which have brought huge economic losses to the national economy.

Method used

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  • Schiff-base waste cooking oil derivative corrosion inhibitor and preparation method and application thereof
  • Schiff-base waste cooking oil derivative corrosion inhibitor and preparation method and application thereof
  • Schiff-base waste cooking oil derivative corrosion inhibitor and preparation method and application thereof

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Embodiment

[0019] (1) Firstly, filter waste catering oil, then add activated clay with a mass fraction of 5%-10% to the waste oil and stir evenly, decolorize the waste oil, then centrifuge, and take the upper layer of oil;

[0020] (2) According to the molar ratio of 1:3.4, weigh the catering waste oil and 3,4-diaminotoluene pretreated in step (1), put the weighed catering waste oil and 3,4-diaminotoluene into 100mL round-bottomed flask, then add 20mL N-methylpyrrolidone and 5% anhydrous aluminum chloride into the round-bottomed flask respectively, put the round-bottomed flask into a magnetic stirring oil bath, connect a spherical condenser, and pass Enter nitrogen protection, react at 150°C for 3 hours, then raise the temperature to 200°C, stop the reaction after reacting for 12 hours, and obtain a purple-red solution;

[0021] (3) Distill the purple-red solution obtained in step (2) under reduced pressure to remove the solvent, water, and glycerol, and finally obtain a viscous Schiff b...

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Abstract

The invention discloses a Schiff-base waste cooking oil derivative corrosion inhibitor and a preparation method and application of the Schiff-base waste cooking oil derivative corrosion inhibitor. With pretreated waste cooking oil and 3,4-diaminotoluene as raw materials and N-methyl pyrrolidone as a solvent, an amide intermediate is obtained through an acylation reaction, and then the Schiff-basewaste cooking oil derivative corrosion inhibitor is obtained through cyclization and dehydration. The Schiff-base waste cooking oil derivative corrosion inhibitor and the preparation method and application of the Schiff-base waste cooking oil derivative corrosion inhibitor have the advantages that the obtained corrosion inhibitor has a good corrosion inhibition effect, and when the concentration of the corrosion inhibitor is 100 mg / L, the corrosion inhibition rate on carbon steel in a 1 mol / L hydrochloric acid solution reaches 99% or above.

Description

Technical field: [0001] The invention belongs to the field of industrial pickling technology, in particular to a Schiff base catering waste oil derivative corrosion inhibitor and its preparation method and application. Background technique: [0002] Carbon steel materials are widely used in various fields of modern industry, especially in petrochemical and marine fields. Carbon steel materials are extremely susceptible to corrosion by acid, chloride ions and other factors, which have brought huge economic losses to the national economy. It is estimated that each Chinese person has to bear the corrosion cost of more than 1555 yuan every year, with a total of more than 2.1 trillion yuan, that is, the total national corrosion cost accounts for about 3.34% of the GDP of the year. Adding corrosion inhibitors to corrosive media is a convenient, economical and applicable means of corrosion protection. [0003] The method of using an acid solution to remove scale and rust on the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06
CPCC23G1/068
Inventor 刘峥陈则胜艾慧婷郭雨婷吴富城韦贤梅
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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