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Neutralizing corrosion inhibitor and application thereof

A corrosion inhibitor and corrosion inhibitor technology, applied in the field of neutralizing corrosion inhibitors, can solve problems such as difficult stability, scaling on the surface of equipment, and failure to effectively inhibit corrosion, so as to achieve low preparation and use costs, avoid under-deposit corrosion, Excellent anti-corrosion effect

Active Publication Date: 2020-11-17
广东粤首新科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The general process index requires the pH range to be controlled below 8.5, but it is difficult to stably control the pH of the system condensate within this range during ammonia injection, and the site generally needs to control the pH value above 9.0, which not only causes a great waste of ammonia water, but also It is easy to cause serious scaling on the surface of the equipment, causing corrosion under the scale, and at the same time, the proportion of hydrogen sulfide dissolved will increase rapidly, resulting in a further increase in hydrogen sulfide corrosion
In addition, the ammonia injection can not effectively inhibit the corrosion of the dew point in the initial condensation area, which makes the spot corrosion of the volatile line at the top of the atmospheric tower serious

Method used

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  • Neutralizing corrosion inhibitor and application thereof
  • Neutralizing corrosion inhibitor and application thereof
  • Neutralizing corrosion inhibitor and application thereof

Examples

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Effect test

preparation example Construction

[0029] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0030] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0031] The synthesis of embodiment 1 imidazoline amide

[0032] Polyethylene polyamine, glacial acetic acid and fatty acid are used as raw materials, and toluene is used as solvent, and the amidation reaction is carried out at a temperature of 110-135°C for 3-5 hours. The resulting product undergoes a ring-closure reaction at a temperature of 200-240°C under normal pressure. 2-5 hours, and steam out toluene, make imidazoline amide, and described imidazoline amide structure is as follows:

[0033]

[0034]

[0035]

Embodiment 2

[0036] Compound and performance test of embodiment 2 water-soluble corrosion inhibitor

[0037] (1) The following raw materials are mixed according to a certain mass ratio, and stirred evenly at room temperature

[0038]

[0039] (2) The corrosion inhibition rate of the composition is tested by coupon weight loss method

[0040] The A3 steel coupons are surface polished, cleaned, soaked, dried, weighed and hung in a container. Add the test solution into the container and set the test time and temperature. After the test is over, take out the coupon, remove the surface grease, remove the corrosion products on the surface of the test piece, wash, dry and weigh it. Calculate the corrosion rate according to the weight loss of the steel piece. The corrosion rate and corrosion inhibition rate are calculated by the following formula:

[0041] Corrosion rate

[0042] m mass loss of test piece, g;

[0043] m o The average value of the mass loss of the test piece pickling blank...

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Abstract

The invention relates to a neutralizing corrosion inhibitor composition. The neutralizing corrosion inhibitor composition is prepared from components including (1) a water-soluble corrosion inhibitorcomposition and (2) an organic amine neutralizer; the water-soluble corrosion inhibitor composition is prepared from imidazoline amide of the following structure, a surfactant and a solvent; the structure of the imidazoline amide is shown in the specification, wherein n ranges from 8 to 17, and m ranges from 1 to 5; preferably, n is 8 or 17, and m is 2 or 3; the surfactant is selected from peregaland TX10; the solvent is selected from water and / or ethanol; and the organic amine neutralizer is selected from one or more of triethylamine, ethanolamine, ethylenediamine, n-butylamine, 1,2-propanediamine, 1,3-propane diamine, isobutylamine, dimethylethanolamine and diethyl ethylenediamine. According to the composition, the use amounts of the water-soluble corrosion inhibitor and the neutralizer are small, and the corrosion-resistant effect is excellent through cooperative use of the water-soluble corrosion inhibitor and the neutralizer.

Description

technical field [0001] The invention belongs to the technical field of petroleum refining, and in particular relates to a neutralizing corrosion inhibitor combined with a water-soluble corrosion inhibitor and a neutralizing agent and its use. Background technique [0002] The corrosion of the atmospheric and vacuum unit in the refinery refers to the metal corrosion of the top of the initial distillation tower, the top of the atmospheric tower and the top of the vacuum tower (referred to as the three tops). Atmospheric and vacuum tower equipment is mainly in contact with petroleum. The main components in petroleum - various hydrocarbons do not corrode metal equipment, but impurities in petroleum such as inorganic salts, sulfur, nitrogen compounds, O 2 , organic acid, CO 2 Although the content of water, moisture, etc. is small, the corrosion damage to the equipment is great. In the atmospheric and vacuum devices of refineries, the corrosion of equipment is most common and se...

Claims

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Application Information

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IPC IPC(8): C23F11/14
CPCC23F11/149
Inventor 叶显孟傅小川
Owner 广东粤首新科技有限公司
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