阅读说明：本技术 一种用于常减压装置的缓蚀剂及其制备方法 (Corrosion inhibitor for atmospheric and vacuum distillation unit and preparation method thereof ) 是由 袁文平 于 2020-06-22 设计创作，主要内容包括：本发明公开了一种用于常减压装置的缓蚀剂及其制备方法,属于缓蚀剂技术领域。它按重量份计,包括以下组分：有机胺类化合物20-30份、咪唑啉类化合物10-20份、含硫化合物10-20份、无机盐类化合物5-10份、添加剂5-10份。本发明由咪唑啉类化合物、有机胺类化合物和含硫化合物为主要缓蚀成分,兼具中和和成膜功能,油溶性好,缓蚀率高,能有效地阻止环烷酸、HCL-H<Sub>2</Sub>S-H<Sub>2</Sub>O体系等各种腐蚀介质对金属的腐蚀,对一氧化碳腐蚀亦有良好的抑制作用,另外可与金属离子形成络合沉淀膜和氧化膜,抑制金属电化学腐蚀的阳极和阴极过程,由于缓蚀剂的表面活性作用,减少了沉淀物和金属表面的络合力,使沉积物疏松,因而对沉积物还有一定的清洗作用。(The invention discloses a corrosion inhibitor for an atmospheric and vacuum distillation unit and a preparation method thereof, belonging to the technical field of corrosion inhibitors. The paint comprises the following components in parts by weight: 20-30 parts of organic amine compounds, 10-20 parts of imidazoline compounds, 10-20 parts of sulfur compounds, 5-10 parts of inorganic salt compounds and 5-10 parts of additives. The corrosion inhibitor takes imidazoline compounds, organic amine compounds and sulfur-containing compounds as main corrosion inhibition components, has the functions of neutralizing and film forming, has good oil solubility and high corrosion inhibition rate, and can effectively prevent naphthenic acid and HCL-H 2 S‑H 2 The corrosion of various corrosion media such as O system and the like to metal and carbon monoxide corrosion also have good inhibiting effect, and can form a complex precipitation film and an oxidation film with metal ions to inhibit the anode and cathode processes of metal electrochemical corrosion due to corrosion inhibitionThe surface activity of the agent reduces the complexing force of the sediment and the metal surface, loosens the sediment and has certain cleaning effect on the sediment.)

1. A corrosion inhibitor for an atmospheric and vacuum distillation unit is characterized in that: the paint comprises the following components in parts by weight: 20-30 parts of organic amine compounds, 10-20 parts of imidazoline compounds, 10-20 parts of sulfur compounds, 5-10 parts of inorganic salt compounds and 5-10 parts of additives.

2. The corrosion inhibitor for the atmospheric and vacuum distillation unit as claimed in claim 1, wherein: the organic amine compound is one or a mixture of more than two of monomethylamine, diethylamine, tripropylamine, triethylenediamine and morpholine in any proportion.

3. The corrosion inhibitor for the atmospheric and vacuum distillation unit as claimed in claim 1, wherein: the imidazoline compound is one or a mixture of more than two of cinnamyl imidazoline, naphthenic acid imidazoline, dodecyl ethyl imidazoline and oleyl amine ethyl imidazoline in any proportion.

4. The corrosion inhibitor for the atmospheric and vacuum distillation unit as claimed in claim 1, wherein: the sulfur-containing compound is one or a mixture of more than two of methyltrithio, dimethyl disulfide, thiobenzoic acid and sulfurized isobutylene in any proportion.

5. The corrosion inhibitor for the atmospheric and vacuum distillation unit as claimed in claim 1, wherein: the inorganic salt compound is any one of chromate, silicate, phosphate and molybdate.

6. The corrosion inhibitor for the atmospheric and vacuum distillation unit as claimed in claim 1, wherein: the additive is a mixture of polyacrylic acid and organic phosphonic acid according to a ratio of 1: 1.

7. A preparation method of a corrosion inhibitor for an atmospheric and vacuum distillation unit is characterized by comprising the following steps: the organic amine compound, the imidazoline compound, the sulfur-containing compound, the inorganic salt compound and the additive are put into a reaction kettle according to the weight portion, stirred and mixed for 20-30min under normal pressure, the stirring temperature is 50-80 ℃, and the corrosion inhibitor is obtained after even mixing.

8. The method for preparing the corrosion inhibitor for the atmospheric and vacuum distillation unit as claimed in claim 7, wherein the method comprises the following steps: the prepared corrosion inhibitor is added with purified water to adjust the pH value, and the pH value is controlled between 6 and 7.

Technical Field

The invention relates to a corrosion inhibitor for an atmospheric and vacuum distillation unit and a preparation method thereof, belonging to the technical field of corrosion inhibitors.

Background

In recent years, with the increasing of the exploitation depth of oil fields and the import of a large amount of high-acid crude oil, crude oil in China is increasingly heavy and inferior, the acid value of the crude oil is continuously improved, the corrosion of crude oil processing equipment is more and more serious, and the corrosion problem becomes an important factor influencing the sustainable development of national economy and society.

Naphthenic acid corrosion is a ubiquitous technical problem in the petroleum refining process, and in addition, sulfides and chlorides in sulfur-containing crude oil are decomposed at high temperature to generate HS and HCL which are condensed together with water at the top of a normal-pressure reduction tower to form severe HCL-H₂S-H₂O corrosion, crude oil desalting, alkali injection, ammonia injection and slow injection are generally adopted at home and abroadAt present, more than 90% of oil refineries in China adopt measures of adding different corrosion inhibitors to reduce corrosion conditions of different parts in different devices, and the existing slow release agent has some problems: 1. the effective temperature of the corrosion inhibitor is low, the existing corrosion inhibitor can only ensure the effect under the environment of 200 ℃, but the temperature of a high-temperature section in an atmospheric and vacuum device is usually more than 250 ℃, the use effect of the corrosion inhibitor cannot be ensured, and the stability is poor; 2. the existing corrosion inhibitor has single slow release effect and poor universality aiming at different corrosion medium systems.

Disclosure of Invention

The invention aims at the problems mentioned in the background technology and adopts the following technical scheme to realize:

the corrosion inhibitor for the atmospheric and vacuum distillation unit comprises the following components in parts by weight: 20-30 parts of organic amine compounds, 10-20 parts of imidazoline compounds, 10-20 parts of sulfur compounds, 5-10 parts of inorganic salt compounds and 5-10 parts of additives.

As a preferable example, the organic amine compound is one or a mixture of two or more of monomethylamine, diethylamine, tripropylamine, triethylenediamine and morpholine in any proportion.

As a preferable example, the imidazoline compound is one or a mixture of more than two of cinnamyl imidazoline, naphthenic acid imidazoline, dodecyl ethyl imidazoline and oleyl amine ethyl imidazoline in any proportion.

As a preferable example, the sulfur-containing compound is one or a mixture of two or more of methyltrithio sulfide, dimethyldisulfide, thiobenzoic acid and sulfurized isobutylene in any proportion.

As a preferred example, the inorganic salt-based compound is any one of chromate, silicate, phosphate and molybdate.

As a preferred example, the additive is a mixture of polyacrylic acid and an organic phosphonic acid in a ratio of 1: 1.

A preparation method of a corrosion inhibitor for an atmospheric and vacuum device comprises the steps of putting an organic amine compound, an imidazoline compound, a sulfur-containing compound, an inorganic salt compound and an additive in parts by weight into a reaction kettle, stirring and mixing for 20-30min at normal pressure, wherein the stirring temperature is 50-80 ℃, and uniformly mixing to obtain the corrosion inhibitor.

As a preferred example, the prepared corrosion inhibitor is added with purified water to adjust the pH value, and the pH value is controlled between 6 and 7.

The invention has the beneficial effects that: the corrosion inhibitor takes imidazoline compound, organic amine compound and sulfur-containing compound as main corrosion inhibition components, has the functions of neutralization and film formation, has good oil solubility and high corrosion inhibition rate, and can effectively prevent naphthenic acid and HCL-H₂S-H₂The corrosion medium such as O system, etc. has good inhibiting action to the corrosion of metal and carbon monoxide, and can form complex precipitation film and oxidation film with metal ion to inhibit the anode and cathode process of metal electrochemical corrosion.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purpose and the efficacy of the invention easily understood, the invention is further described with reference to the following embodiments.