The elementary irreversible reaction A+B→ C is conducted in the gas-phase in an isothermal PFR. The feed enters the reactor at a pressure of 10 bar and the temperature of 650 K and consist of 30% A, 30% B and 40% inert. The conversion of A in an existing PFR is measures to be 50%. By what factor should the PFR volume used for this process be increased to achieve a conversion of 75% if there is no change in the feed stream?

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