Temperature control issues in packed extraction towers
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Packed extraction tower, using a solvent for extraction. The bottom temperature, the middle section temperature, and the top temperature – which of these temperatures are primarily used for control? Which one should be the main one?
The thermal effect during the extraction process is generally small; therefore, controlling the extraction temperature essentially means controlling the temperature of the feed materials. Once the temperatures of these two feed streams are under control, the extraction temperature is automatically determined. Therefore, there is no issue with controlling the top, middle, and bottom of the tower; it is necessary to maintain the feed temperature at an appropriate level, as the temperatures at the top, middle, and bottom of the tower are essentially the same.
Generally, the feed temperature is controlled to create a temperature gradient within the extraction tower
Just check the solubility of the solute in the solvent at different temperatures, in order to achieve the best extraction results； Once the extraction temperature is determined, the temperature of the extraction column can be kept constant by controlling the temperatures of the feed and reflux.
Only the pressure at the top of the tower and the amount of solvent used (i.e., the solvent-to-oil ratio), as well as the temperature of the solvent and the feed temperature, are controlled; I haven’t heard of control over the extraction temperature! An outsider
Controlling the temperature of the extraction tower is also achieved by controlling the temperatures of the solvent and the feed.
I’ve learned about this, and I’d like to ask: besides affecting the solubility of the material in the extractant, are there any other safety issues associated with excessively high or low temperatures?
Slightly higher or lower operating temperatures will only affect solubility, which in turn affects the quality of the product at the distillation outlet； There will be no safety issues. Excessively high or low temperatures can disrupt the extraction process and pose safety risks.