Salt formation in the residue hydrocracking distillation column
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I would like to ask why the tower pressure increases after salt formation occurs in the distillation tower
After salt formation in the residue hydrocracking distillation column, an increase in column pressure may be caused by the following reasons: 1. Presence of salt-forming substances: In the distillation column, the presence of such substances hinders the formation and flow of distillates, thereby increasing the pressure and temperature at the bottom of the column and leading to a rise in column pressure. 2. Accumulation of deposits in the tower: Deposits may form inside the distillation tower; these deposits can affect the flow of oil at the bottom of the tower, leading to an increase in pressure there and consequently an rise in overall tower pressure. 3. Improper handling: If the salts formed are not handled properly, it can also lead to an increase in tower pressure. Improper handling may result in salt-forming substances not being completely removed and remaining inside the distillation tower, thereby affecting the flow of oil at the bottom of the tower and causing an increase in tower pressure. In summary, to prevent salt formation in the distillation tower, it is essential to closely monitor its operation, and to promptly remove any accumulated deposits and salt formations, in order to ensure the proper progress of the distillation process and avoid issues such as rising tower pressure. .
It is necessary to analyze where the salt deposition occurs. The tower pressure increases below the salt formation point.
Salt accumulation on the trays reduces the flow area in those areas; as a result, the pressure increases in the section ahead of the salt accumulation while it decreases in the section behind it, which is directly reflected in an increase in the tower pressure drop.