Catalytic start-up of distillation line dehydration
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Catalytic start-up involves a fractional distillation open-loop cycle and dehydration – is dehydration performed at each low-point drain? Or is dehydration only done in the raw material tank, the reprocessing tank, and at the bottom of the distillation tower? Thank you!
Under normal conditions, open drainage is not used; instead, a closed-loop system is employed (at 80–110°C or higher), where water turns into steam and some of it evaporates, while the rest is circulated back to the tank area for dehydration.
Only after diesel and gasoline have been collected should dehydration be carried out at the lowest point; the crude oil does not require this, and it can simply be sent back to the tank area for dehydration in a cyclic manner.
There is water from the crude oil, as well as water remaining in the pipelines, towers, and various containers during pipeline purging; all of this water needs to be removed.
The heavy oil systems are generally dehydrated centrally in the tank area, while the light oil systems have sedimentation and drainage carried out periodically at the lowest point of the process flow!