If the reflux flow at the top of the distillation tower increases, how do the temperature at the top of the tower and the temperature after air cooling change?

The temperature at the top of the distillation tower decreases; it drops further after air cooling. Excessively low temperatures can lead to a reduction in the flow rate at the inlet of the compressor, and in severe cases this can cause surging in the compressor, affecting the backflow rate and thus impacting fluctuations in the reaction pressure.

Excessive reflux flow leads to too low a top temperature; the temperature after cooling is also low, resulting in an imbalance in the flow of gasoline, and salt deposition tends to occur on the upper trays

The temperature at the top of the distillation tower decreases; it drops further after air cooling

Of course, both the top temperature and the temperature after cooling have decreased

The tower top temperature decreases, and the temperature after cooling also drops. It can easily lead to an imbalance in the reflux ratio.

Reply 1# Tmac Zhou: The question raised by the original poster is quite complex; it’s necessary to clarify why the backflow at the top of the tower needs to be increased. For example, when the temperature at the top of the tower is high, top reflux is needed to lower this temperature, so as to ensure that the dry point of the product at the top of the tower meets the required standards. This situation occurs mainly when the plant’s load is high; under such conditions, the amount of heat that can be removed through top circulation is limited, and it becomes necessary to use top reflux to control the temperature there. This process makes use of the cooling capacity available in the tower’s top system. If this cooling capacity is not sufficient, only a slight reduction in the top temperature will occur. However, as the top temperature drops, the temperature at the top will rise again, the pressure at the top will increase, the pressure drop from the top to the reflux tank will rise, the temperature at the inlet of the compressor will increase, the pressure at the compressor inlet will decrease, and the compressor’s load will increase ； So it would be best for the original poster to clearly state the premises that need to be discussed or the purposes you want to understand

The top temperature will decrease, and the temperature after air cooling will also drop

An increase in reflux usually leads to a decrease in the temperature at the top of the tower, but the temperature after cooling may not necessarily drop. Especially with a large amount of reflux over a short period of time, the temperature after cooling might first rise and then fall. This is mainly because an increase in reflux at the top of the tower results in an increased load on the cooler at that location, which can cause the temperature after cooling to rise.

Why does the pressure at the inlet of the compressor increase?