Coking problem of residue at 350 degrees at the bottom of the vacuum distillation tower
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At 350 degrees, the residue at the bottom of the vacuum tower flows slowly and can form coking; will it also form coking if it flows faster? It’s still 350 degrees
Coking occurs quite quickly at this temperature; increasing the line speed would help.
With a high linear velocity, the residence time at the bottom is short
What is the relationship between short residence time and coking? Coking is caused by temperature, not by speed
Coking at the lower part of a normal vacuum distillation column is not severe, and the anti-coking experience from catalytic fractionation columns can be applied.
Coking is mainly related to temperature, and it is also somewhat related to speed; a higher speed results in less coking
Agree with the opinion above. The shorter the residence time, the better; therefore, the bottom of the vacuum distillation tower is narrower than the top, in order to reduce the residence time of the residue oil.