Fractionating tower, temperature, pressure
Thread Content
Does the pressure at the top of the distillation tower refer to the pressure throughout the entire tower? An increase in the top temperature leads to an increase in the top pressure; is this because more light components are vaporized as a result of the higher temperature? Why does a decrease in the pressure at the top of the distillation tower lead to a decrease in the temperature at the top of the tower?
The top pressure refers to the pressure at the top of the tower, not the pressure throughout the entire tower; there is a certain pressure drop within the tower. As the top temperature rises, more light components evaporate, but the content of heavy components also increases. The pressure at the top of the tower decreases, which causes a temporary drop in temperature; this temperature then rises again (as pressure decreases, the boiling point of the material drops, resulting in an increase in evaporation)
The top pressure refers to the pressure at the top of the tower； As the temperature at the top of the tower rises, it seems that the pressure throughout the entire tower increases as well! Under normal circumstances, this leads to an increase in the concentration of high-boiling-point substances at the top of the tower; in such cases, it is necessary to increase the reflux rate in order to lower the temperature at the top of the tower... If the pressure in the distillation tower decreases, then the pressure in the main tower will also decrease, and simultaneously the temperature in the main tower will drop as well ； Pressure, temperature, and the number of components are all in one-to-one correspondence!