Distillation column operation
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What are the purposes of the three feed streams in a distillation tower?
There is only one goal, and that is to improve the distillation efficiency
Oh, is there no other purpose? What is the principle behind improving distillation efficiency? Thank you
The more light components there are, the higher the feed position
A complete distillation column includes a stripping section, a feed section, and a distillation section. The use of three feed paths involves changing the location of the feed inlet; in effect, this alters the number of trays in the other two sections
Perhaps the optimal feeding plate has not been designed yet; only an approximate range is known. When designing the tower, three feeding methods were implemented, and in actual operation, the one that results in lower energy consumption is used
It is determined based on the target product; if a higher purity at the bottom of the tower is required, feed is introduced at the top, and more trays are used in the stripping section； If a higher purity for the overhead product is required, the feed should be introduced at a lower level, with more distillation tray stages.
The number of trays is adjusted by changing the feed position to improve distillation efficiency
Adjust according to the lightness and heaviness of the feed components
The temperature of the material at different feed positions must also match the temperature at the corresponding positions within the tower.