Relationship between bottom liquid level and temperature

As the bottom liquid level rises, the bottom temperature decreases. Because the liquid level at the bottom of the tower is high, there are more light components present, and more heat is needed to evaporate them. If these light components don’t have enough heat to evaporate, they will remain at the bottom of the tower, thereby lowering the temperature there:lol

As the liquid level rises, the temperature definitely decreases

The original poster is correct; with all other factors remaining constant, a higher liquid level at the bottom of the tower is mainly due to an increase in light components, which results in a lower temperature

According to the conditions stated by the poster, the temperature at the bottom of the tower is primarily determined by the composition of the material at that location, and it has nothing to do with the liquid level. Therefore, once the liquid level rises, as long as the composition of the material at the bottom of the tower remains unchanged, its temperature will not change.

Based on the conditions provided by the poster, as the liquid level rises and the heat dissipation by the liquid increases, the temperature at the bottom of the tower should decrease.

My understanding is: 1. With the parameters of the heat medium remaining unchanged (without automatic control of the reactor temperature), using a thermosyphon reboiler should result in an increase in temperature. The reasons are as follows: As the liquid level in the tower bottom rises, the boiling section of the reboiler gets submerged, and the evaporation rate decreases as the liquid level increases. If the liquid level covers the vaporization ports, the reboiler functions as a heater, and evaporation occurs only within the cross-section of the tower; as a result, the temperature rises due to the significant decrease in evaporation and the substantial reduction in latent heat ； 2. If a falling-film evaporator is used, there is basically no impact. Since this evaporator uses a pump for circulation, the factors that primarily affect the evaporation rate are the flow rate and temperature of the heat medium, as well as the circulation volume. As long as the level of the kettle fluid does not block the vapor rise port, there will be no changes ； 3. The reduction in light components mentioned by everyone generally does not occur at first; it only happens after the evaporation rate drops significantly, causing a marked decline in the separation capacity of the entire tower. After some time, the light components will settle at the bottom of the tower, but this will not result in a decrease in the temperature at the bottom of the tower. Imagine boiling water with the lid off: at 100 degrees, the water vaporizes. By adding a liquid seal to the lid, the temperature inside the pot gradually approaches that of the heating medium, so it rises.

When the feed rate and other conditions remain unchanged, an increase in the bottom liquid level will lead to a decrease in the bottom temperature, while a decrease in the bottom liquid level will result in an increase in the bottom temperature. As the liquid level at the bottom of the tower increases, the temperature at the bottom of the tower will decrease. Generally, the temperature is increased, the reflux flow is reduced, and more product is taken from the top of the tower; once the system returns to normal, adjustments are made again to reach the parameters required by the process.

As the liquid level at the bottom of the tower increases, the temperature generally decreases, provided that all other conditions remain unchanged.

Not necessarily; it depends on other conditions and the main factors causing an increase in the bottom liquid level. If only production affects it, there won’t be a significant change in temperature

The high level of liquid at the bottom of the tower causes it to flood, which leads to a rise in the temperature at the bottom. Another possibility is that there are many heavy components at the bottom of the tower, preventing the temperature from rising.