Atmospheric pressure column quality control
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What are the main control measures for the 95% point of the normal three-line?
The main control measures for the 95% point of the normal three-line system typically include temperature control, flow control, and pressure control. By precisely controlling these parameters, product quality and the stable operation of the tower can be ensured. .
For any product, the vapor temperature at the upper part of the product determines things such as the initial boiling point and flash point, while the vapor temperature at the lower part controls the temperature at which 95% of the product has distilled out, as well as the dry point; other parameters are controlled as appropriate
The control method for the entire tower is a bit different, right? The catalytic distillation tower relies mainly on the distillate temperature, while atmospheric pressure units also have distillate flow control. I don’t understand – if you control the distillation temperature, then you should be able to control the 95% point, right? Why does the amount of distillate still affect the control of the 95% point?
The extraction temperature is controlled by the backflow at the constant third line.
In a distillation column, extraction can generally be done in either a full-extraction or semi-extraction manner. There is a slight difference between these two methods in terms of temperature control: it comes down to the use of internal reflux or external reflux for temperature regulation. Both internal and external reflux are used to control temperature. With internal reflux, by controlling the amount of distillate, one also controls the amount of internal reflux, and thus the distillation temperature. With external reflux, by adjusting the amount of reflux, one can control the distillation temperature. Therefore, I would say that regardless of the product, the gas phase temperature at the upper part of the product determines parameters such as the initial boiling point and flash point, while the gas phase temperature at the lower part determines parameters like the 95% distillation point and the dry point. In any case, temperature control involves regulating the gas phase temperature or the liquid phase temperature, which is essentially the distillation temperature; this can serve as a reference