High-water-solubility and high-temperature-resistant Mannich base corrosion inhibitor intermediate and preparation method thereof

Abstract

The invention discloses a high-water-solubility and high-temperature-resistant Mannich base corrosion inhibitor intermediate and a preparation method thereof. According to the preparation method, no solvent is utilized, and an aldehyde-ketone-amine condensation compound reacts with a hydrophilic group surfactant in the presence of an alkali metal alkoxide catalyst so as to obtain the high-water-solubility and high-temperature-resistant Mannich base corrosion inhibitor intermediate. The preparation method has the advantages that no solvent is utilized, so that the defect that a product is low in content or is difficult to recycle due to the utilization of the solvent is solved, and the production cost is saved. By utilizing the Mannich base corrosion inhibitor intermediate, the defects that other corrosion inhibitors are poor in water solubility and are easily decomposed at the high temperature are solved, the inconveniences caused by toxic substances to the production are reduced, and the acidification and corrosion of high-temperature hydrochloric acid can be inhibited, so that the problem of strong acid corrosion in an acid fracturing process of the oil exploitation in China is solved, and a purpose of protecting an oil tube is achieved.

Description

[0001] The invention belongs to the field of chemical synthesis, and in particular relates to a high-temperature-resistant Mannich base corrosion inhibitor intermediate and a preparation method thereof. Background technique [0002] The research on high-temperature acidification corrosion inhibitors in my country started relatively late, and it was not gradually developed until the mid-to-late 1970s. However, research and application have improved rapidly. After the mid-1980s, various acidification corrosion inhibitors have been developed and produced successively. , to solve the production needs of some oil fields. However, some earlier high-temperature acidification corrosion inhibitors have problems such as poor water solubility and poor corrosion inhibition effect under high temperature conditions. However, Mannich base has been used as an acidifying corrosion inhibitor on a certain scale and has been well applied. For example, the 7801 corrosion inhibitor developed by Hua...

AI Technical Summary

Problems solved by technology

The shortcomings of the Mannich base corrosion inhibitor used earlier are easy to decompose at high temperature, and the compound is highly toxic, which seriously affects the performance of the corrosion inhibitor.

The combination of Mannich base and hydrophilic surfactant solves the problems of easy decomposition of Mannich base at high temperature and poor water solubility

Foreign countries have formed boiled compounds by compounding metal salts to meet the needs of high temperature, such as the reaction of thiourea, formaldehyde and acetophenone mentioned in the patent (Appl. 300° F (about 149°C) corrosion rate reaches 0.0051b / ft2 (12.21g / (m2.h)), but antimony trichloride corrosion Strong resistance, which brings inconvenience to the production of corrosion inhibitors

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