Method for preparing water-soluble high-temperature corrosion inhibitor

Abstract

The invention discloses a method for preparing a water-soluble high-temperature corrosion inhibitor, which comprises the following steps: (1) antirust complex preparation: accurately weighting water, a boric acid and glycerin in proportion, adding the weighted water, boric acid and glycerin into a reaction kettle, heating the reaction kettle and adding monoethanolamine into the reaction kettle, heating the obtained mixture until the obtained mixture is boiled, flowing back and then cooling the obtained object so as to obtain an anti-rust complex; and (2) dosing: pumping sulfonated castor oil and the antirust complex obtained in the step (1) into a reaction kettle, heating and stirring the obtained mixture, cooling the obtained mixture and adding water into the obtained mixture, uniformly stirring the obtained product so as to obtain a water-soluble high-temperature corrosion inhibitor. The water-soluble high-temperature corrosion inhibitor prepared by using the method disclosed by the invention is good in water-solubility, no cosolvent is not required to be added when the corrosion inhibitor is used in a formula, and no laying phenomenon occurs when the corrosion inhibitor is compounded with any organic amine, thereby facilitating a neutralization reaction between the corrosion inhibitor and a naphthenic acid in raw oil; and the antirust complex of the corrosion inhibitor in the invention and the sulfonated castor oil can form a dense and firm protective film in a high-temperature tower, thereby effectively preventing the raw oil from eroding the inner wall of the tower.

Description

technical field [0001] The invention belongs to the technical field of metal corrosion and protection, and in particular relates to a preparation method of a water-soluble high-temperature corrosion inhibitor. Background technique [0002] As the main equipment material, metal is widely used in the industry, and the application of corrosion and protection of metal materials is becoming more and more extensive. One of the effective ways to solve the corrosion of metal materials is to use corrosion inhibitors to protect metals. [0003] Naphthenic acid is an organic acid with saturated ring structure widely present in crude oil. In the crude oil refining process, naphthenic acid usually causes corrosion damage to the refining equipment system and pipeline, and is related to the total acid number (TAN) of crude oil in the processing process. When the TAN is greater than 0.2, the naphthenic acid is Corrosion occurs, and significant corrosion occurs when TAN is greater than 0.5,...

AI Technical Summary

Problems solved by technology

The corrosion damage of naphthenic acid to equipment is not only harmful to the equipment, but also has a serious impact on the secondary processing device. When naphthenic acid corrodes, serious acid iron is produced, which has a strong fine cleaning effect on the metal surface and brings FeS into the The secondary addition device will cause serious damage to the catalyst

[0004] At present, high-temperature corrosion inhibitors are mostly made of phosphorous acid, phosphate or phosphate ester, which are simple to make, but the addition amount is relatively large. Experiments have proved that the corrosion inhibition effect is not ideal when used alone.

Some corrosion inhibitor raw materials are poisonous, which will inevitably cause certain pollution to the environment, cannot be widely used, and some have even been eliminated

Corrosion inhibitors are mostly oil-soluble, and their dispersion performance in raw oil is not good, which is not conducive to the neutralization reaction with naphthenic acid in raw oil, resulting in unsatisfactory corrosion inhibition effect

Furthermore, there is a certain corrosion of the raw oil on the tower wall or pipe wall, and the existing corrosion inhibitors cannot solve this problem well

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