Corrosion Questions and Answers

You should choose 1. The reason is that most of the salts in crude oil are chlorides. Although electric desalination can remove some of them, some still enter the subsequent equipment with the crude oil. Under certain conditions, the chloride salts will hydrolyze to form hydrogen chloride, which is the main cause of corrosion in low-temperature light oil parts.

Choose 2 because the acid and salt are removed in one processing.

This should be a problem with the atmospheric and vacuum distillation unit. At the operating temperature of atmospheric distillation, sulfides in crude oil will decompose, but the amount of decomposition is not large, so the hydrogen sulfide corrosion produced should not be the main aspect. Naphthenic acid corrosion is mostly in the measuring line fraction of atmospheric distillation. Although its side line can also be called light oil, the corrosion temperature of naphthenic acid is generally above 120 degrees, and the temperature of low-temperature corrosion is generally below 120 degrees, so it is not considered to be acid corrosion.； In addition, the corrosion at the top of the atmospheric tower is currently due to the increase in the processing of sulfur-containing crude oil and high-sulfur crude oil. Strictly speaking, the corrosion characteristics are hydrogen chloride + hydrogen sulfide + water corrosion, but the decisive factor in corrosion should still be hydrogen chloride. Therefore, I think 1 should be chosen.