| 摘要 |
An apparatus and method are provided for the fractional distillation of liquids in a fractionation column wherein cool liquids from the bottom tray of the column are effectively prevented from passing out directly with bottoms product before first passing through a reboiler. The column is of the type which includes a hollow shell having a surge baffle plate which divides a bottom portion of the shell interior into a first region and a second region. A separation baffle plate is provided which extends into the first region. At least one seal pan whose bottom is closely adjacent to the upper edge of the separation baffle receives liquids flowing from the bottom tray by means of a downcomer. The seal pan includes at least one side wall, perpendicular to the separation baffle plate, which is structured to direct substantially all liquid overflowing thereform into a third region defined between one surface of the separation baffle plate and the shell interior surface, the overflowing liquid then flowing into the above defined first region. Liquid in the first region is withdrawn and passed through a reboiler, which discharges heated fluids. These heated fluids are introduced into the shell from a position adjacent to a fourth region on the opposite side of the separation baffle plate with respect to the third region. Liquid in the second region is withdrawn as bottoms product.
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