Distillation column pressure
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When discussing issues with colleagues, I encountered a problem: as the vacuum level increases, the volatility of materials with high boiling points rises. In a negative-pressure distillation column, when the vacuum level increases during operation while the temperature remains constant, how should the absolute pressure inside the column change? This post was last edited by bpf3860743 on 2007-12-27 12:38.]
Vacuum degree = Atmospheric pressure – Absolute pressure. The higher the vacuum, the lower the absolute pressure will be
Similarly, for gauge pressure: Gauge pressure = Absolute pressure – Atmospheric pressure
Is the question phrased incorrectly? As the vacuum level increases and the absolute pressure decreases, it affects the temperature of the material, causing it to drop.
Building 2 is right: vacuum degree = atmospheric pressure – absolute pressure. The higher the vacuum level and the lower the absolute pressure, the lower the vaporization temperature of the material, and the greater its volatility.