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Method for evaluating corrosion of naphthenic acid

A naphthenic acid and corrosive medium technology, applied in the field of naphthenic acid corrosion evaluation, can solve the problems of shortening the test period, not enough to generate shear force, and the erosion is more serious than the actual situation, so as to promote the corrosion rate and overcome the shear force Insufficient, the effect of reducing the cost of equipment construction and operation

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rotation method has the advantages of simple equipment and small amount of test solution, but the eddy current caused by the rotation and the relative speed of the solution moving with the rotating test piece reduce its relative speed, which is not enough to generate sufficient shear force; the advantage of the tube flow method is that it can compare It can well simulate the actual working conditions of pipeline scour, and the experimental results have strong practical value, but the system takes up a lot of space, the amount of solution required for the experiment is large, the experiment period is long, and the construction and operation costs of the device are high; The advantage is that it can provide a high impact flow velocity, thus shortening the test period. The disadvantage is that it cannot simulate the actual working conditions well, and the erosion is more serious than the actual situation. In order to obtain a high impact flow velocity, the diameter of the nozzle is generally only 1 ~2mm, easy to block during operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Corrosive medium: TAN=1.2mgOH / g naphthenic acid white oil solution. The experiment was carried out in a glass reactor. The stirring speed was 300rpm, the experiment temperature was 280℃, and the experiment time was 4h. Sodium naphthenate with an average molecular weight of 300 was added. The amount added was 0.01% of the weight of the naphthenic acid white oil solution. The corrosion rate was from the traditional 0.2mm / a of the corrosion test method, increased to 2.3mm / a.

Embodiment 2

[0022] Corrosive medium: TAN=2.5mgOH / g minus third-line distillate oil. The experiment was carried out in a glass reactor with a stirring speed of 300rpm, an experiment temperature of 280℃, and an experiment time of 4h. Sodium naphthenate with an average molecular weight of 300 was added. The amount added was 0.01% of the mass of the third-line distillate. The corrosion rate was determined by traditional corrosion. The method’s 0.9mm / a increased to 7.3mm / a.

Embodiment 3

[0024] Corrosion medium: high acid crude oil with TAN=3.54mgOH / g, take crude oil and 270~350℃ distillate and 350~530℃ distillate respectively for corrosion experiment. The experiment was carried out in an autoclave with a stirring speed of 300 rpm, an experiment temperature of 280° C., and an experiment time of 4 hours. Magnesium naphthenate with an average molecular weight of 300 was added, and the amount added was 2% of the mass of the corrosive medium.

[0025] Corrosive medium

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PUM

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Abstract

The invention relates to a method for evaluating the corrosion of naphthenic acid. The method comprises the following steps: adding alkali metal salt of naphthenic acid and / or alkaline-earth metal salt of naphthenic acid into a corrosion medium, wherein the added amount is 0.005-10% of the mass of the corrosion medium; enabling the corrosion medium to contact and react with a metal test piece; and representing the corrosivity of the corrosion medium with the weight loss of the metal test piece in unit area and unit time. The method provided by the invention can be used for evaluating the corrosion of naphthenic acid of acid-containing hydrocarbon oil.

Description

Technical field [0001] The invention relates to a method for evaluating naphthenic acid corrosion. Background technique [0002] Naphthenic acid corrosion in oil refining units is a hot spot for domestic and foreign refining companies, and it is also a difficult problem that needs to be solved urgently. With the deterioration of crude oil, the acid value of crude oil is increasing year by year, and the problem of naphthenic acid corrosion in oil refining units is also increasing. Increasingly prominent, it seriously threatens the safety production of enterprises. Although naphthenic acid corrosion has been discovered for nearly 80 years, people still lack a systematic and in-depth understanding of the nature of this corrosion phenomenon and its controlling factors. There are two main reasons: (1) Influencing factors of naphthenic acid corrosion It is very complicated. Factors such as temperature, acid value, flow rate and equipment materials are closely related to this corrosion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04
Inventor 王征杜鹤李本高
Owner CHINA PETROLEUM & CHEM CORP