Does the temperature of the distillation column body exhibit a temperature gradient, and does the pressure of the column body also exhibit a pressure gradient? What to do if separation cannot be achieved?
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Does the temperature of the distillation column body exhibit a temperature gradient, and does the pressure of the column body also exhibit a pressure gradient? What to do if separation cannot be achieved?
Yes, a gradient is necessary~ There are various reasons why separation cannot be achieved, and the worst one is that the tower height is too low.
For flow within a fluid column, there must be a temperature and pressure gradient.
The distillation tower itself has pressure and temperature gradients, which is normal. If separation is not achieved, first check whether there have been any changes in the components of the raw material Check again to see if the backflow volume and backflow ratio are correct
1 Adjust the height of the feed inlet, 2 increase the reflux at the top of the tower, 3 reduce the heating rate (to prevent light components from rising), 4 increase the pressure in the tower (if increasing pressure can widen the boiling point difference between light and heavy components), 5 replace the trays or packing with ones that have a higher number of theoretical plates……
This post was last edited by tanlang on 2017-9-4 at 13:54. There is another scenario in which the gas-liquid distribution on the tray is uneven, resulting in \"bias flow\"; as a result, the desired mass transfer efficiency between gas and liquid is not achieved. I wonder how long your tower has been in use?
This will not achieve the desired separation effect; either there are not enough tray numbers, or the heat exchange efficiency of the trays is poor
1. Is your tower a new one or an old one? 2. Is it a plate tower or a packed tower? 3. What are the tower diameter and height? 4. What are your evaporation rate and reflux rate? 5. What is the pressure difference between the top and bottom of the tower? These data need to be clarified in order to help you find the real cause.