High-temperature corrosion inhibitor for H2S-HCl-H2O system and preparation method of high-temperature corrosion inhibitor

Abstract

The invention relates to a high-temperature corrosion inhibitor for an H2S-HCl-H2O system and a preparation method of the high-temperature corrosion inhibitor. According to the preparation method, methyl-alpha-naphthyl ketone, morpholine and sulfur are taken as main raw materials and are subjected to a Willgerodt-Kindler method to generate naphthylethyl thioacylmorpholine. The high-temperature corrosion inhibitor comprises the following components in percentage by weight: 30%-50% of ethyl thioacylmorpholine, 5%-15% of hexadecyl pyridine, 10%-15% of alcohol amine compounds, 1%-3% of potassium molybdate or potassium tungstate and 29%-57% of a solvent. The high-temperature corrosion inhibitor belongs to strong-adsorption mixed type corrosion inhibitors, is capable of forming a layer of compact protecting film on the surface of metal and particularly applicable to the corrosion prevention of the H2S-HCl-H2O system and can be generalized and used for the prevention of sulfuretted hydrogen corrosion in the industries of oil fields, boilers and steel mills. The use temperature of the high-temperature corrosion inhibitor during the use can reach 120 DEG C; the high-temperature corrosion inhibitor has the characteristics of low consumption, high efficiency, wide use temperature range, good dispersity and low environmental pollution and is simple and convenient to produce.

Description

technical field [0001] The invention belongs to the technical field of anticorrosion of materials in the field of petrochemical industry, and specifically relates to a H 2 S-HCl-H 2 High temperature corrosion inhibitor for O system and its preparation method. Background technique [0002] In petrochemical plants, H 2 S-HCl-H 2 The mixed corrosion of O system is a serious problem. The type of corrosion mechanism, the severity of corrosion damage and the impact on safe production are far better than those of other factories. The high-temperature parts of the heavy oil unit are usually made of corrosion-resistant materials, while the low-temperature light oil parts at the top of the distillation tower are subjected to HCl-H 2 S-H 2 For the corrosion of O system, if austenitic stainless steel is used, there will be Cl - To solve the problem of stress corrosion cracking, chemical injection anti-corrosion technology is generally used, that is, neutralizers are used to reduce...

AI Technical Summary

Problems solved by technology

However, the disadvantages of this kind of corrosion inhibitors are their bad smell, easy hydrolysis, and short validity period, which cannot protect equipment for a long time, increase operating costs, and endanger the health of operators.

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