Fundamentals of Chemical Engineering: One question per day. What consequences can occur if the heat supply to the heating vessel of a fractional distillation tower is insufficient and does not reach the specified level?
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What are the consequences of insufficient heat in the heating vessel of the crude distillation tower, failing to reach the specified value? (1) The material balance is disrupted; the amount of methanol lost from the reactor liquid increases, while the amount of methanol at the top of the tower decreases, resulting in a reduction in the tower’s production capacity ； (2) Incomplete evaporation of low-boiling-point substances affects the quality of the product obtained through distillation, increases reflux, and raises consumption ； (3) The vapor-liquid equilibrium is disrupted, the amount of steam rising in the tower decreases, vapor-liquid contact worsens, and the mass transfer efficiency drops; improper handling can affect the quality of pure methanol.
①The material balance is disrupted, resulting in an increased discharge of liquid from the reactor and a decreased amount of distillate at the top of the tower. For the process aimed at obtaining product at the tower top, this leads to a reduction in the tower’s production capacity； ②The gas-liquid equilibrium is disrupted, resulting in a decrease in the amount of vapor rising within the tower. This leads to poorer gas-liquid contact, reduced mass transfer efficiency. At the same time, the concentration of heavier components in the gas phase decreases, while the concentration of lighter components in the liquid phase increases, causing an increased loss of lighter components in the bottom stream.
What are the consequences of insufficient heat in the heating vessel of the crude distillation tower, failing to reach the specified value? The concentration of the heavy components in the bottom liquid of the tower is low and does not meet the requirements. . .
①The material balance is disrupted, resulting in an increased discharge of liquid from the reactor and a decreased amount of distillate at the top of the tower. For the process aimed at obtaining product at the tower top, this leads to a reduction in the tower’s production capacity； ②The gas-liquid equilibrium is disrupted, resulting in a decrease in the amount of vapor rising within the tower. This leads to poorer gas-liquid contact, reduced mass transfer efficiency. At the same time, the concentration of heavier components in the gas phase decreases, while the concentration of lighter components in the liquid phase increases, causing an increased loss of lighter components in the bottom stream.