Neutral corrosion inhibitor and synthesis method thereof

Abstract

The invention provides a neutral corrosion inhibitor and a synthesis method thereof. The neutral corrosion inhibitor is prepared from the following components: crude naphthenic acid, polyethylene polyamine, xylene, dimethyl sulfate, ethanol, a dispersant, a water-soluble imidazoline compound and a nitrogen-containing adsorption corrosion inhibitor. The synthesis method of the neutral corrosion inhibitor comprises the following steps that 1, the crude naphthenic acid and a xylene solvent are mixed; 2, a solution obtained in the step 1 is stirred and heated; 3, the polyethylene polyamine is added, and a reaction is conducted for 4-5 h; 4, pressurizing distillation is conducted to obtain the xylene; 5, heating is conducted to 200-250 DEG C, and a reaction is conducted for 3-4 h; 6, vacuumizing is conducted to evaporate water, then cooling is conducted, and thus an intermediate product is obtained; 7, the intermediate product and the solvent are mixed, stirred and heated to 100-120 DEG C;and 8, the dimethyl sulfate is added, heating is conducted to 125-135 DEG C, a reaction is conducted for 3-5 h, and thus a finished product is obtained. The neutral corrosion inhibitor has the characteristics of being high in corrosion inhibition efficiency, high in chemical stability, low in dosage, low in cost, low in toxicity, odorless, easy and convenient to operate on site and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of a neutralizing corrosion inhibitor, in particular to a neutralizing corrosion inhibitor and a synthesis method thereof. Background technique [0002] With the continuous increase of high-acid and high-sulfur crude oil processing volume, the corrosion of refinery equipment is becoming more and more serious, which has affected the safety, stability, long-term, full-load, and high-quality production of refinery equipment. The sulfides and chlorides in crude oil decompose and hydrolyze at high temperature to generate H2S and HCl. H2S and HCl often exist in the condensation cooling system at the top of the atmospheric and vacuum distillation tower in refinery equipment. When H2S and HCl are combined with water When condensed, a corrosive environment of HCl-H2S-H2O is formed, which causes the corrosion problem of the condensation cooling system at the top of the atmospheric and vacuum distillatio...

AI Technical Summary

Problems solved by technology

The sulfides and chlorides in crude oil decompose and hydrolyze at high temperature to generate H2S and HCl. H2S and HCl often exist in the condensation cooling system at the top of the atmospheric and vacuum distillation tower in refinery equipment. When H2S and HCl are combined with water When condensed, a corrosive environment of HCl-H2S-H2O is formed, which causes the corrosion problem of the condensation cooling system at the top of the atmospheric and vacuum distillation column

In view of the HCl-H2S-H2O corrosion problem of the condensing cooling system at the top of the atmospheric and vacuum distillation tower, if stainless steel is used for corrosion protection, there will be problems of chloride and sulfide stress corrosion cracking, so the "one removal and three injection" process is generally used for corrosion protection Measures, that is, the use of crude oil electric desalination technology to reduce the salt content in crude oil and the injection of corrosion inhibitors, ammonia, and water in the condensation cooling system at the top of the tower, but it is also difficult to solve the problem of corrosion