Corrosion inhibitor for atmospheric and vacuum distillation unit and preparation method of corrosion inhibitor

Abstract

The invention discloses a corrosion inhibitor for an atmospheric and vacuum distillation unit and a preparation method of the corrosion inhibitor, and belongs to the technical field of corrosion inhibitors. The corrosion inhibitor comprises the following components of, in parts by weight, 20-30 parts of an organic amine compound, 10-20 parts of an imidazoline compound, 10-20 parts of a sulfur-containing compound, 5-10 parts of an inorganic salt compound and 5-10 parts of an additive. According to the corrosion inhibitor and the method, the imidazoline compound, the organic amine compound and the sulfur-containing compound are used as main corrosion inhibition components, neutralization and film-forming functions are achieved, the oil solubility is good, the corrosion inhibition rate is high, the corrosion of naphthenic acid, HCL-H2S-H2O systems and other corrosive media to metal can be effectively prevented, and a good inhibition effect is achived on carbon monoxide corrosion; and in addition, the corrosion inhibitor and metal ions can form a complex precipitation film and an oxidation film to inhibit the anode and cathode processes of metal electrochemical corrosion, and due to the surface activity effect of the corrosion inhibitor, the complexing force between precipitates and a metal surface is reduced, the precipitates are loosened, and therefore a certain cleaning effect is achieved on the precipitates.

Description

technical field [0001] The invention relates to a corrosion inhibitor for atmospheric and vacuum devices and a preparation method thereof, belonging to the technical field of corrosion inhibitors. Background technique [0002] In recent years, with the increasing exploitation depth of oil fields and the import of a large amount of high-acid crude oil, my country's crude oil has become increasingly heavy and inferior, its acid value has continued to increase, and the corrosion of crude oil processing equipment has become more and more serious. Corrosion problems have become An important factor affecting the sustainable development of the national economy and society. [0003] In the process of petroleum refining, naphthenic acid corrosion is a common technical problem. In addition, sulfide and chloride in sour crude oil decompose at high temperature, and produce H2S and HCL, which are condensed together with water at the top of the atmospheric and vacuum tower. Formation of s...

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Problems solved by technology

[0003] In the process of petroleum refining, naphthenic acid corrosion is a common technical problem. In addition, sulfide and chloride in sour crude oil decompose at high temperature, and produce H2S and HCL, which are condensed together with water at the top of the atmospheric and vacuum tower. Formation of severe HCL-H 2 S-H 2 O corrosion, at home and abroad generally adopt crude oil desalination, alkali injection, ammonia injection, corrosion inhibitor injection, water injection and other anti-corrosion measures. Corrosion in different parts of the device, there are still some problems with the existing slow-release agent: 1. The effective temperature of the corrosion inhibitor is low. The temperature of the high-temperature section in the device usually reaches above 250°C, the effect of the corrosion inhibitor cannot be guaranteed, and the stability is poor; 2. The slow-release effect of the existing corrosion inhibitor is single, and it has poor versatility for different corrosive medium systems

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