In the crude oil distillation process, different molecular weight fractions with naphthenic acid and its boiling point and similar vaporization vaporization, condensation and condensation, and the soluble fraction, so the fraction has a corrosive effect on equipment. Naphthenic acid corrosion property is related to molecular weight, and low molecular naphthenic acid is more corrosive.

It is generally believed that naphthenic acid is more active in liquid phase than boiling point in the liquid phase. Therefore, the corrosion is most serious at the intersection of vapor and liquid, and it is not corroded below 220 degrees centigrade. With the increase of temperature, the temperature of the naphthenic acid increases with the increase of temperature, which is usually at the maximum of 270-280 and over 280. The naphthenic acid is partially gasified, but not condensed, and the concentration of naphthenic acid in the liquid phase is low. When the temperature is above 350, the gasification speed of naphthenic acid increases, the gas velocity increases, and the corrosion rate rises again, but most of the results are due to the action of sulfur, and no corrosion occurs above 400 degrees.

According to the data, it is possible that the naphthenic acid has been completely gasified at 400 degrees Celsius, and no corrosion has occurred to the high temperature parts of the equipment. In the high temperature zone, there are two corrosion peaks (270-280 and 350-400 degrees) of naphthenic acid corrosion with the increase of temperature.

In the crude oil distillation process, different molecular weight naphthenic acid with ISO octoate, coating driers, degreased naphthenic acid and its boiling point fractions and vaporized, vaporization condensation and condensation, and the soluble fraction, so the fraction has a corrosive effect on equipment. Naphthenic acid corrosion property is related to molecular weight, and low molecular naphthenic acid is more corrosive.

It is generally believed that naphthenic acid is more active in liquid phase than boiling point in the liquid phase. Therefore, the corrosion is most serious at the intersection of vapor and liquid, and it is not corroded below 220 degrees centigrade. With the increase of temperature, the temperature of the naphthenic acid increases with the increase of temperature, which is usually at the maximum of 270-280 and over 280. The naphthenic acid is partially gasified, but not condensed, and the concentration of naphthenic acid in the liquid phase is low. When the temperature is above 350, the gasification speed of naphthenic acid increases, the gas velocity increases, and the corrosion rate rises again, but most of the results are due to the action of sulfur, and no corrosion occurs above 400 degrees.

According to the data, it is possible that the naphthenic acid has been completely gasified at 400 degrees Celsius, and no corrosion has occurred to the high temperature parts of the equipment. In the high temperature zone, there are two corrosion peaks (270-280 and 350-400 degrees) of naphthenic acid corrosion with the increase of temperature.