Vacuum problems in vacuum distillation columns
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There is a vacuum distillation column 17 meters high, with a vacuum level at the top of the column of -0.094 MPa. The pressure measurement point inside the column is located 4.3 meters from the top, near the feed point, while the pressure measurement point at the bottom of the column is 15 meters from the top. What are the typical vacuum levels inside the column and at its bottom?
This is closely related to the tower internals and operating parameters. Generally, a pressure drop of 1~2 Kpa across the entire tower is considered reasonable
It is best to contact the design firm to confirm such matters for reference.
I compared the data records: the pressure drop was low before, but it became higher later on; it seems there might be some blockage. I’m currently checking the distributor and the packing
If the gas and liquid load on the tower does not increase while the pressure drop rises significantly, it is likely that the packing is fouled, and the tower needs to be boiled or the packing cleaned.
It’s best to consult a design institute regarding the filler for the tower Tray? The operating conditions play a role; if it’s difficult to find a design institute, simply install a vacuum gauge for direct measurement.