Seeking help regarding desalination and dewatering parameters
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I would like to ask the experts: after desalination and dehydration in a refinery, what are the salt and water content levels in the oil? What is the oil content in roughly all and two-stage dehydration processes at the moment?
After electrodialysis desalination, the water content in the crude oil should generally be kept below 0.3%, while the salt content should be less than 3 mg/L. Excess moisture content can affect the operation of the initial distillation tower and cause corrosion of the equipment.
It is considered qualified if the salt content is less than 3 mg/L and the moisture content is less than 0.3%. However, as crude oil becomes of lower quality, refineries now have increasingly higher requirements for electrodialysis, making it more difficult to meet the specified standards; addressing the challenges related to electrodialysis is a problem that plagues petrochemical plants everywhere.
The indicator controlled by some organizations is: salt content after desalting
Sinopec stipulates that the salt content in crude oil after desalting should be less than 5 mg NaCl/g, and the water content should be less than 0.3 wt%. The oil content in the electrodialysis desalinated wastewater is less than 200 ppm; currently, it is difficult to achieve this level for wastewater resulting from the processing of low-quality crude oil, with levels generally kept below 5 mgNaCl/g.
It is related to the properties of the oil products you process and the process parameter requirements set by various parties.