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Imidazoline asymmetrical bi-quaternary ammonium salt, method for preparing same and application thereof

A double quaternary ammonium salt, asymmetric technology, applied in the direction of organic chemistry, can solve the problems of large dosage of chemicals, poor water solubility, short protection period, etc., and achieve the effects of strong continuous action ability, corrosion inhibition, and cheap raw materials

Inactive Publication Date: 2009-09-16
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Today, imidazoline corrosion inhibitors have been greatly developed, but there are still some problems, such as large dosage, short protection period, poor water solubility, etc.

Method used

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  • Imidazoline asymmetrical bi-quaternary ammonium salt, method for preparing same and application thereof
  • Imidazoline asymmetrical bi-quaternary ammonium salt, method for preparing same and application thereof
  • Imidazoline asymmetrical bi-quaternary ammonium salt, method for preparing same and application thereof

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Embodiment Construction

[0011] The imidazoline asymmetric bis-quaternary ammonium salt of the present invention has a lower critical micelle concentration, and can be effectively adsorbed on the surface of carbon steel through the interaction of N and O heteroatoms in the imidazoline ring and molecular structure with Fe. to corrosion inhibition.

[0012] The diquaternary ammonium salt of imidazoline asymmetry of the present invention is synthesized according to the following process:

[0013] 1. Preparation of Alkyl Imidazolines

[0014] In a 250ml four-necked flask equipped with a water separator and a condenser, add lauric acid, i.e. 30.1g (0.15mol) of dodecyl carboxylic acid, 23.3g (0.23mol) of diethylenetriamine and 30ml xylene, then add 2 ~5 zeolites to prevent bumps. Control the temperature of the reaction system at 120°C to 160°C, and react at this temperature for 1 to 4 hours. Then gradually increase the temperature at a rate of 10° C. to 20° C. per hour until 200° C. to 260° C., continue ...

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Abstract

The invention relates to an imidazoline asymmetrical bi-quaternary ammonium salt. The preparation method comprises the following steps that: diethylene triamine and organic acids of octalkyl to heptadecyl react to generate alkyl imidazoline; long chain alkyl tertiary amine, hydrochloride of long chain alkyl tertiary amine and epichlorohydrin react to generate N-(3-chlorine-hydroxypropyl)-N, N-dimethyl long chain alkyl quaternary ammonium salt; and the alkyl imidazoline and the N-(3-chlorine-hydroxypropyl)-N, N-dimethyl long chain alkyl quaternary ammonium salt react. When the salt is used as a carbon steel corrosion protection acid pickling inhibitor, the salt has the advantages of easy synthesis, low-priced and easily-bought materials; because the salt is the organic inhibitor, the salt is nontoxic and unharmful, and has wide biological activity and good water solubility and can effectively inhibit corrosion of metallic matrix in the acid and excessive consumption of acid liquor; moreover, the salt also has the advantages of low consumption, high efficiency, strong sustained action capability and good application prospect.

Description

technical field [0001] The invention relates to a diquaternary ammonium salt containing imidazoline asymmetry, a preparation method thereof and an application as a carbon steel pickling corrosion inhibitor. Background technique [0002] At present, in the process operations such as pickling of metal materials, cleaning of metal equipment, and acidizing of oil wells, as well as in the pickling and rust removal of electroplating, enamel, and metal surface treatment, the most commonly used acids are hydrochloric acid and sulfuric acid during pickling, but Strong inorganic acids can cause serious corrosion to metals. During the pickling process, not only the rust and dirt on the metal surface are removed, but also part of the metal substrate is also removed. In addition, a large amount of acid liquid produced in the pickling process has caused serious damage to the environment. Therefore, adding corrosion inhibitors during pickling is an effective way to inhibit the corrosion o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/16C23G1/06C23G1/08
Inventor 张静杜敏蒋斌
Owner OCEAN UNIV OF CHINA
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