Deethanizer pressure
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Why does the reflux increase when deethanizing, causing the pressure to decrease? And why does the pressure gradually increase when the reflux decreases? What is the relationship between them?
Yes, this phenomenon is correct: as the reflux ratio increases, more gas phase is condensed, the total volume of gas inside the tower decreases, so the pressure drops; the same principle applies when it increases.
Agree with what was said on the second floor. Because the reflux ratio has increased, more vapor is condensed by the pump inside the tower. As a result, the pressure at the top of the tower decreases.
As the reflux increases, the liquid in the reflux partially condenses the vapor phase coming from the bottom of the tower, reducing the amount of light components that rise upward; as a result, the tower pressure decreases.
This phenomenon usually occurs at pressure measurement points after water cooling. It may be due to a decrease in the top temperature, which results in a reduction of the components at the tower top.
With gas-liquid contact, the gas phase decreases and the pressure drops; therefore, a higher reflux rate results in lower pressure. What is mainly measured is the pressure of the gas phase. For reference only.
Increased reflux leads to the condensation of some of the gas at the top of the tower, resulting in a decrease in partial pressure
Cold reflux and tower pressure are inversely proportional