Relationship between the final boiling point of the light components at the top of the fractionation tower and pressure
Thread Content
With the top temperature unchanged, how does the final boiling point change as the pressure at the tower top increases?
With constant temperature, the lower the pressure, the more light components there are; therefore, the boiling range of the light components increases
With constant temperature and rising column pressure, the light components decrease, and the boiling range narrows. Because at the same temperature, the saturated vapor pressure remains relatively constant, but if the external pressure is high, vaporization becomes more difficult.
If you’re asking about the final boiling point, first of all, the initial boiling point should decrease. As for whether pressure will affect the final boiling point, I think it will cause the final boiling point to drop, but I’m not entirely sure. It’s only certain that the evaporation rate will decrease; it depends on how much the pressure increases. You’ll need an experienced technician to take a look at it. Haha
With the top temperature remaining constant, an increase in the top pressure causes the components at the tower top to become lighter, or in other words, the boiling range narrows. As the saying goes, when the pressure is high, vaporization is difficult; the heavier components cannot be vaporized, and as a result, the final boiling point (KK value) of the components at the tower top decreases.
High pressure results in a low dry point, while low pressure results in a high dry point. It is related to the amount of vaporization of a liquid at different pressures; as the pressure increases, the vaporization temperature also rises. When the temperature remains constant, an increase in pressure prevents some of the heavier components from vaporizing, resulting in a lower dry point. The opposite occurs at lower pressures.