Question

The ethylene epoxidation is to be carried out using a cesium-doped silver catalyst in a packed-bed reactor. C2H4+1/2O2?C2H4O -r1E = (k1EPEPO^0.58)/(1+K1EPE)^2 Along with the desired reaction, the complete combustion of ethylene also occurs C2H4+3O2?2CO2+2H2O -r2E = (k2EPEPO^0.3)/(1+K2EPE)^2 It is proposed to replace the conventional PBR with a membrane reactor in order to improve the selectivity. As a rule of thumb, a 1% increase in the selectivity to ethylene oxide translates to an increase in profit of about $2 million/yr. The feed consists of 12% (mole) oxygen, 6% ethylene, and the remainder nitrogen at a temperature of 250°C and a pressure of 2 atm. The total molar flow rate is 0.0093 mol/s to a reactor containing 2 kg of catalyst. k1E = 0.15 mol/(kg?s?atm^1.58) at 523 K with E1 = 60.7 kJ/mol k2E = 0.0888 mol/(kg?s?atm^1.3) at 523 K with E2 = 73.2 kJ/mol K1E = 6.50 atm^-1, K2E = 4.33 atm^-1 a) What conversion and selectivity of ethylene epoxide to CO2 are expected in a conventional PBR? b) What would be the conversion and selectivity if the total molar flow rate were divided and the 12% oxygen stream (no ethylene) were uniformly fed through the sides of the membrane reactor, and 6% ethylene (no oxygen) were fed at the entrance? c) Repeat (b) for a case when ethylene is fed uniformly through the sides and oxygen is fed at the entrance. Compare with parts (a) and (b). Describe what you find.

          The ethylene epoxidation is to be carried out using a cesium-doped silver catalyst in a packed-bed reactor.
C2H4+1/2O2?C2H4O -r1E = (k1E*PE*PO^0.58)/(1+K1E*PE)^2
Along with the desired reaction, the complete combustion of ethylene also occurs
C2H4+3O2?2CO2+2H2O -r2E = (k2E*PE*PO^0.3)/(1+K2E*PE)^2
It is proposed to replace the conventional PBR with a membrane reactor in order to improve the selectivity. As a rule of thumb, a 1% increase in the selectivity to ethylene oxide translates to an increase in profit of about $2 million/yr. The feed consists of 12% (mole) oxygen, 6% ethylene, and the remainder nitrogen at a temperature of 250°C and a pressure of 2 atm. The total molar flow rate is 0.0093 mol/s to a reactor containing 2 kg of catalyst.
k1E = 0.15 mol/(kg?s?atm^1.58) at 523 K with E1 = 60.7 kJ/mol
k2E = 0.0888 mol/(kg?s?atm^1.3) at 523 K with E2 = 73.2 kJ/mol
K1E = 6.50 atm^-1, K2E = 4.33 atm^-1

a) What conversion and selectivity of ethylene epoxide to CO2 are expected in a conventional PBR?
b) What would be the conversion and selectivity if the total molar flow rate were divided and the 12% oxygen stream (no ethylene) were uniformly fed through the sides of the membrane reactor, and 6% ethylene (no oxygen) were fed at the entrance?
c) Repeat (b) for a case when ethylene is fed uniformly through the sides and oxygen is fed at the entrance. Compare with parts (a) and (b). Describe what you find.

The ethylene epoxidation is to be carried out using a cesium-doped silver catalyst in a packed-bed reactor.
C2H4+1/2O2?C2H4O -r1E = (k1E*PE*PO^0.58)/(1+K1E*PE)^2
Along with the desired reaction, the complete combustion of ethylene also occurs
C2H4+3O2?2CO2+2H2O -r2E = (k2E*PE*PO^0.3)/(1+K2E*PE)^2
It is proposed to replace the conventional PBR with a membrane reactor in order to improve the selectivity. As a rule of thumb, a 1% increase in the selectivity to ethylene oxide translates to an increase in profit of about $2 million/yr. The feed consists of 12% (mole) oxygen, 6% ethylene, and the remainder nitrogen at a temperature of 250°C and a pressure of 2 atm. The total molar flow rate is 0.0093 mol/s to a reactor containing 2 kg of catalyst.
k1E = 0.15 mol/(kg?s?atm^1.58) at 523 K with E1 = 60.7 kJ/mol
k2E = 0.0888 mol/(kg?s?atm^1.3) at 523 K with E2 = 73.2 kJ/mol
K1E = 6.50 atm^-1, K2E = 4.33 atm^-1

a) What conversion and selectivity of ethylene epoxide to CO2 are expected in a conventional PBR?
b) What would be the conversion and selectivity if the total molar flow rate were divided and the 12% oxygen stream (no ethylene) were uniformly fed through the sides of the membrane reactor, and 6% ethylene (no oxygen) were fed at the entrance?
c) Repeat (b) for a case when ethylene is fed uniformly through the sides and oxygen is fed at the entrance. Compare with parts (a) and (b). Describe what you find.

Added by George J.

Question

Please give Ace some feedback