What is the relationship between the top pressure and the top temperature of a catalytic cracking fractionation tower? Directly proportional or inversely proportional?
Thread Content
This post was last edited by 103388716 on 2010-12-21 01:23. What is the relationship between the top pressure and the top temperature of a catalytic cracking distillation column? Directly proportional or inversely proportional? What is the reason for this?
Reply to 1# 103388716: Generally, the top temperature of a tower varies with the pressure at the top of the tower; the higher the pressure there, the higher the top temperature. What comes out of the top of the tower is a mixture of saturated hydrocarbons and water vapor. The higher the pressure, the greater the saturated vapor pressure of this mixture, and consequently the higher the saturated temperature; therefore, the temperature at the top of the tower is also higher.
In my opinion, it should be the pressure at the top of the tower that changes with temperature; the higher the temperature at the top of the tower, the greater the pressure. The reason is that as the temperature rises, the light components in the vaporized mixture remain unchanged while the heavy components increase, resulting in an increase in pressure. Personal opinion, for reference only.