A batch process is operated with the following sequence. The feed to the batch process consists of a solution of 500 L of ethanol with 120 mole of A and 120 mole of B. If the temperature of the solution is sufficient, A and B will react to form P (the desired product): A (eth) + B (eth) → P (s) DHreact = − 250 kJ/mol (1) Note that the product P is sparingly soluble in ethanol, which helps facilitate its removal from the reaction solution. It can be assumed that the reaction rate is first-order in both the concentration of A (cA) and B (cB), and so second-order overall: (2) The batch process consists of the following FOUR steps: Initially, the tank is empty. Fill tank with solution (ethanol/A/B).Increase temperature of the feed from 20°C to 50°C (1 hour) Reaction takes place isothermally at 50°C (4 hours, to give conversion of 50%) Filtration of reaction solution to give product P (2 hours) Drying with hot nitrogen gas followed by the removal of powder product (3 hours) The amount of product produced by the end of each batch is p=60 mol Q1: It is suggested that the reactor conversion might be increased to 90% to increase the value of (nP)end, or perhaps reduced to 20% to reduce the value of (nP)end. Q2: Describe how to determine the optimum X value to maximise the throughput of P
A batch process is operated with the following sequence. The feed to the batch process consists of a solution of 500 L of ethanol with 120 mole of A and 120 mole of B. If the temperature of the solution is sufficient, A and B will react to form P (the desired product):
A (eth) + B (eth) → P (s) DHreact = − 250 kJ/mol (1)
Note that the product P is sparingly soluble in ethanol, which helps facilitate its removal from the reaction solution. It can be assumed that the reaction rate is first-order in both the concentration of A (cA) and B (cB), and so second-order overall:
(2)
The batch process consists of the following FOUR steps:
Initially, the tank is empty.
- Fill tank with solution (ethanol/A/B).Increase temperature of the feed from 20°C to 50°C (1 hour)
- Reaction takes place isothermally at 50°C (4 hours, to give conversion of 50%)
- Filtration of reaction solution to give product P (2 hours)
- Drying with hot nitrogen gas followed by the removal of powder product (3 hours)
The amount of product produced by the end of each batch is p=60 mol
Q1: It is suggested that the reactor conversion might be increased to 90% to increase the value of (nP)end, or perhaps reduced to 20% to reduce the value of (nP)end.
Q2: Describe how to determine the optimum X value to maximise the throughput of P.
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