Process Calculations GATE-2011

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Q 1: Ammonia is synthesized at 200 bar and 773 K by the reaction N_2+3H_2\rightleftharpoons2{\mathrm{NH}}_3 . The yield of ammonia is 0.45 mol/mol of fresh feed. The flow sheet for the process (along with available compositions) is shown below.

The single pass conversion for H2 in the reactor is 20 %. The amount of H2 lost in the purge as a percentage of H2 in fresh feed is





Ans is A)

Explanation:

Q 2: The following combustion reactions occur when methane is burnt.

{\mathrm{CH}}_4+2O_2\rightarrow{\mathrm{CO}}_2+2H_2O

2{\mathrm{CH}}_4+3O_2\rightarrow2CO+4H_2O

20 % excess air is supplied to the combustor. The conversion of methane is 80 % and the molar ratio of CO to CO2 in the flue gas is 1:3. Assume air to have 80 mol % N2 and the rest O2. The O2 consumed as a percentage of O2 entering the combustor is





Ans is B)

Explanation:


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