Illustration 3.6 Nickel carbonyl is to be produced by passing carbon monoxide gas downward through a bed of nickel spheres, 12.5 mm diam. The bed is 0.1 m² in cross section and is packed so that there...

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Extracted text: Illustration 3.6 Nickel carbonyl is to be produced by passing carbon monoxide gas downward through a bed of nickel spheres, 12.5 mm diam. The bed is 0.1 m² in cross section and is packed so that there are 30% voids. Pure CO enters at 50°C, 1 std atm, at the rate of 2 x 10-3 kmol/s. The reaction is Ni + 4CO - Ni(CO), For present purposes, the following simplifying assumptions will be made: 1. The reaction is very rapid, so that the partial pressure of CO at the metal surface is essentially zero. The carbonyl forms as a gas, which diffuses as fast as it forms from the metal surface to the bulk-gas stream. The rate of reaction is controlled entirely by the rate of mass transfer of CO from the bulk gas to the metal surface and that of the Ni(CO), to the bulk gas. 2. The temperature remains at 50°C and the pressure at I std atm throughout. 3. The viscosity of the gas = 2.4 x 10-5 kg8/m-s, and the Schmidt number = 2.0 throughout. 4. The size of the nickel spheres remains constant. Estimate the bed depth required to reduce the CO content of the gas to 0.5%.