After using a corrosion inhibitor at the top of the atmospheric pressure tower, a layer of black scum appears at the oil-water interface. What is the reason for this?
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After using a corrosion inhibitor at the top of the atmospheric pressure tower, a layer of black scum appears at the oil-water interface. What is the cause? How should it be dealt with?
It is normal to have a mixture of impurities such as coking dust in the raw materials. In such cases, the oil-water interface can be appropriately reduced and then discharged.
The black substance is caused by sulfuride particles containing a large amount of iron. To neutralize the HCL in gasoline, an ammonia injection process is used at the top of the tower in order to prevent corrosion resulting from the dissolution of HCL in water and the formation of highly concentrated acids. Therefore, it is necessary to maintain a stable pH level; significant fluctuations in pH can lead to the appearance of black water, as the concentration of iron ions in such water is usually very high!
It’s normal to regularly flush the water scum in the oil-water separation tank. It can provide relief
It’s very serious; the concentration of iron ions in the water is not high. Especially in winter, the emulsification of naphtha is severe, and the presence of residues in the oil is also serious, which causes blockages in the pipeline pumps (cage pumps), leading to significant difficulties in production. Is it related to the type of corrosion inhibitor injected at the top of the atmospheric pressure tower?
This post was last edited by hnlh on 2009-8-28 09:01 to check whether the salt content is excessive after desalination, or whether the anti-corrosion measures in the tower top are not effective. Let’s first take a look at the test analysis data for water separation from the regular roof oil tanks.