Relationship between tower pressure and liquid falling temperature
Thread Content
When the top pressure of the distillation column increases, does the temperature of the liquid at the bottom of the top condenser increase or decrease?
Logically, it should increase; it depends on whether there are any significant changes in the gas phase composition at the top of the tower.
You also need to check the condition of your condenser; the temperature should not change until the condenser is operating at full load
When the top pressure of a distillation column increases, the temperature of the liquid at the bottom of the top condenser cannot be determined universally. It is best to consider the pressure of the distillation column as well as the pressure difference between the distillation section and the stripping section ； Comprehensive assessment based on changes in the composition of meteorological components, the operating condition of the condenser, etc.
As the tower pressure increases, the temperature of the vapor phase at the top surely rises. If the condensation load remains unchanged, the temperature of the liquid flowing downward will increase significantly. If the condensation load is high enough, the temperature of the liquid flowing downward may not increase.
When the tower pressure increases, it becomes more difficult for the liquid to boil; vaporization is hindered, and a large amount of heat is generated during the gas-liquid exchange, causing the temperature to rise.
Tower pressure increases, and temperature rises. If all other conditions of the reflux condenser remain unchanged, the condensate temperature will rise.
When the tower pressure is high, the temperature must be increased. . Only then can the evaporation rate of the bottom liquid increase.
Assuming that the top pressure of the tower is controlled by the circulating water flow rate, an increase in top pressure leads to an increased consumption of refrigerant, a decrease in the reflux temperature, and a reduction in vapor flow, after which the pressure returns to its original level.