Sulfur-containing wastewater from the atmospheric and vacuum distillation tower tops
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The salt content in the effluent from our atmospheric and vacuum distillation unit is generally around 1.7 mg/l; then why does the chlorine content in the sulfur-containing wastewater at the tower top consistently reach 50–60? How can the chlorine content in the wastewater at the top of the tower be reduced?
It is mainly due to enrichment; most of the chlorine in the raw material accumulates at the top of the tower as distillation proceeds, resulting in an increased chloride ion content in the water taken from the top of the tower.
Electrodesalination removes inorganic salts, primarily sodium chloride, magnesium chloride, and calcium chloride. During the extraction of crude oil, additives are injected to increase the recovery rate; some of these additives contain large amounts of chlorine, and this chlorine ends up in the tower top system as part of the crude oil during distillation! Also, has the elemental composition of the additives used at the top of the tower been analyzed? What is the chlorine content in the water used to prepare these additives? All these affect the chloride ion content at the top of the tower!
Is the organic chlorine content in crude oil high? Also check the chlorine content in straight-run oil to ensure it does not affect diesel hydrogenation.
Under normal circumstances, crude oil mainly contains inorganic salts. However, during its extraction process, additives such as polychlorides and polyferrics are added, which increases the chloride ion content in the crude oil. This has a significant impact on subsequent processing processes and can cause corrosion of pipelines and equipment. It is advisable to analyze the types and concentrations of cations in the water, as well as to determine the source of chloride ions in the water body; this will make it easier to find solutions. This is just a suggestion