Benzene C6H6 is converted to cyclohexane C6H12 by direct reaction with H2. The f

Question

Benzene C6H6 is converted to cyclohexane C6H12 by direct reaction with H2. The fresh feed to the process is 260 L/min of CgH6 plus 950L/min of H2 at 100 degree C and 150 KPa. The single pass conversion of H2 in the reactor is 48% while the overall conversion of H2 in the process is 75%. The recycle stream contains 90% H2 and the remainder benzene (no cyclohexane). Write a balanced equation for the above reaction Determine the partial pressure of H2 and C6H6 in the fresh feed Determine the molar flow rates of H2, C6H6 and C6H12 in the exiting product Determine the volumetric flow rate of the components in the product streams if it exists at 100KPa and 200 degree C Determine the molar flow rate of the recycle stream (Hint: do H-atomic balance on both reactor and separator together) Determine the volumetric ratio of the recycle stream at 100 degree C and 100 kPa to the fresh stream at STP. Use atomic species balances to solve the question.

Explanation / Answer

1. The balanced chemical reaction is

C6H6 + 3H2 ---------------> C6H12

2. Partial pressure can be calculated as

Partial pressure = mole fraction x Total pressure

Partial pressure of C6H6 = 260/(260+950) x 150 kPa = 32.23 kPa

Partial pressure of H2 = 950/(260+950) x 150 kPa = 117.77 kPa

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