Mannich base quaternary ammonium salt compound and preparation method thereof

Abstract

The invention provides a mannich base quaternary ammonium salt compound and a preparation method thereof. An aldehyde solution, organic amine and a solvent are added to a reaction container, a pH value is regulated to be 3.5-4.5, reflux reaction is performed at the temperature of 50-70 DEG C for 0.2-1 hour, acrylic diethyl ethaneioate is dropwise added, reflux reaction is performed at the temperature of70-90 DEG C for 5-8 hours to obtain a flaxen mannich base after adding is completed; then, KI is added, benzyl chloride is dropwise added, stirring reaction is performed at the temperature of 80-110 DEG C for 4-6 hours to obtain reddish mannich base quaternary ammonium salt. Tests indicate that the mannich base quaternary ammonium salt compound has a very good corrosion inhibition effect. On the one hand, the corrosion inhibitor can form a very good organic protective layer on the metal surface; on the other side, heteroatoms of the corrosion inhibitor are adsorbed on the metal surface, the charge state and interface properties of the metal surface are changed, accordingly the activation energy of corrosion reaction is increased, and corrosion reaction is hindered.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and relates to a metal preservative, in particular to a Mannich base quaternary ammonium salt compound and a preparation method thereof. Background technique [0002] With the development of oil drilling technology and the advancement of oil recovery technology, the development of a large number of deep wells, ultra-deep wells and extremely deep wells has made oil collection more difficult. Acidizing is one of the measures commonly used to increase production in the oil field production process, but it will cause different degrees of corrosion on the surface pipeline and the wellbore wall, causing huge economic losses and environmental pollution; according to statistics, the annual corrosion amount of steel products in the world One hundred million tons is equivalent to 10% of the annual output, so metal corrosion protection is an urgent problem; adding corrosion inhibitors is a simple, low-cost and...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the corrosion inhibitors produced at home and abroad are imidazoline, quaternary ammonium salts and quinoline quaternary ammonium salts, but the corrosion inhibition effect of these corrosion inhibitors deteriorates sharply at high temperatures, which cannot meet the needs of industrial production. At the same time, these corrosion inhibitors have defects such as poor corrosion inhibition effect, poor acid solubility, and high toxicity. It can better inhibit metal corrosion, and occupies an important position in acidizing corrosion inhibitors used in oil fields. It has the advantages of stable structure, low toxicity, and good temperature and acid resistance, and is widely used; the present invention is based on the above reasons , a new Mannich base was synthesized by Mannich reaction with the ester containing more polar bonds as the acid component, which has the characteristics of low cost, simple and mild synthesis conditions, good corrosion inhibition effect and high temperature resistance, etc. Quaternization, on the one hand, enhances the acid solubility, on the other hand, it has the characteristics of quaternary ammonium corrosion inhibitors, so it has a good development and application prospect

Images