Feed to the distillation tower
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When a stream enters the distillation tower, does it branch off into upper and lower sections, or into two or more feed streams?
Why is it designed this way in terms of manufacturing process? In that case, how is the number of plates calculated?
This refers to the different trays in the column depending on various operating conditions, when the concentration of a certain component in the feed varies. Enter a certain tray at a certain concentration ； When the operating conditions change and the feed concentration changes, it is possible to manually switch to different trays.
Yes, generally feeding is not done at the same time; in some cases it is due to changes in the composition of the materials in the previous system.
This has many applications in actual production; for example, the feed inlet locations in gas separation units are usually three to four in number, and these inlets are adjusted according to the properties of the different raw materials in order to control the purity of the components at the top and bottom of the tower.
The change in raw materials has led to significant variations in the components entering the tower. This is quite normal; the output can also be divided into several streams. For example, mixed xylene consists of several components, and a distillation tower isn’t able to separate them all.