What are the consequences of a low vapor temperature at the bottom of a distillation column, and what causes the vapor temperature to be lower than the liquid temperature?
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Sometimes the raw material has a low density; in order to maintain the liquid level at the bottom of the distillation tower, the temperature at the bottom of the tower is lowered. What are the effects of having a low temperature?； Also, the gas phase temperature is a few degrees lower than the liquid phase temperature. Why is that?
By reducing the temperature at the bottom of the tower, some of the components that originally belonged to gasoline and diesel remain in the slurry. This increases the yield of the slurry while reducing the yield of the product; moreover, the viscosity of the slurry decreases
Also, the gas phase temperature is a few degrees lower than the liquid phase temperature. Why is that? The reason is that heat must be absorbed as it goes from the liquid phase to the gas phase, and the temperature will definitely drop after heat is absorbed.