High-precision distillation scaling θ-loop (Dickson) packed column
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Currently in laboratories, packed towers using Theta rings (i.e., θ rings, or Dickson rings) are commonly employed for high- and ultra-high-difficulty distillation separations. However, based on existing experience, such packing is only suitable for towers with small diameters of 100 mm or less, more commonly below 65 mm. The production capacity is extremely poor! Only one domestic pharmaceutical company has attempted to use towers of 150 mm or larger; the results are either unknown or kept confidential. Then there are concepts such as cluster towers and parallel towers, but no successful cases have been seen. Experts are welcome to discuss this topic.
For this type of Sita ring, its efficiency drops sharply when the tower is enlarged; are there any ways to mitigate this? Is it possible to enlarge it appropriately, and if so, how?“
You can try using wire mesh corrugated packing
I’ve tried screen corrugation; it’s much worse, only 1/3 as good
The θ-ring offers a specific surface area of at least 3–4K, along with excellent natural liquid distribution even at small tower diameters, which is truly unprecedented.
When scaling up, regular packing with a particle size of over 1K can be considered, or Xitai rings can also be used; however, it is necessary to ensure proper liquid distribution and to reduce the height of each layer of packing
Typical laboratories are primarily used for process validation, rather than for production with an emphasis on output volume. If production is to take place, a larger tower diameter is required. At that time, screen packing could be used, and the height of the tower could be increased to achieve this.
Thank you. The small varieties that are difficult to separate do not yield much. When using screen corrugations, there is always concern regarding the high height of the tower, as well as the need for precise process parameters for the components inside the tower.
It’s that type where multiple small-diameter tubes are connected in parallel to form a cylinder, right?