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Process Calculations

9 Questions
GATE→2026→Process Calculations→Process Calculations
Q1
MCQ[1 Mark]
For an irreversible reaction containing inerts in the feed, single-pass conversion in a reactor is 70%. Which one of the following statements is CORRECT?
GATE→2026→Process Calculations→Process Calculations
Q2
NAT[2 Marks]
A feed containing 10 mol % propylene, 15 mol % ammonia and rest air is charged into a reactor to produce acrylonitrile (C3H3N\text{C}_3\text{H}_3\text{N}) according to the following reaction: 2C3H6+2NH3+3O2→2C3H3N+6H2O2\text{C}_3\text{H}_6 + 2\text{NH}_3 + 3\text{O}_2 \to 2\text{C}_3\text{H}_3\text{N} + 6\text{H}_2\text{O} Assume, air contains 80 mol % N2\text{N}_2 and 20 mol % O2\text{O}_2. If the conversion of the limiting reactant is 30%, the composition of C3H3N\text{C}_3\text{H}_3\text{N} (in mol %) in the product stream is ______ (rounded off to two decimal places).
GATE→2026→Process Calculations→Process Calculations
Q3
NAT[2 Marks]
Cyclohexane (C6H12\text{C}_6\text{H}_{12}) is produced from benzene (C6H6\text{C}_6\text{H}_6) and hydrogen (H2\text{H}_2) according to the following reaction: C6H6+3H2→C6H12\text{C}_6\text{H}_6 + 3\text{H}_2 \to \text{C}_6\text{H}_{12} Consider the process flow diagram shown in the figure. In this process, the overall and single-pass conversions are 90% and 25%, respectively. The recycle stream contains 25 mol % C6H6\text{C}_6\text{H}_6 and 75 mol % H2\text{H}_2. If the fresh feed contains 25% excess H2\text{H}_2, at steady state, the ratio of the molar flow rate of recycle stream to that of the fresh feed is ______ (rounded off to one decimal place).
Figure for Question 3
GATE→2024→Process Calculations→Process Calculations
Q4
NAT[1 Mark]
Consider the reaction N2+3H2⇌2NH3N_2 + 3H_2 \rightleftharpoons 2NH_3 with inlet flow rates 100100 mol/s (N2N_2), 300300 mol/s (H2H_2). If H2H_2 conversion is 0.600.60, outlet flow rate of N2N_2 is ______ mol s−1^{-1}.
GATE→2024→Process Calculations→Process Calculations
Q5
NAT[2 Marks]
Consider manufacturing process for B with feed of 90 mol% A and inert I. Product rate 100 kmol/h, single-pass conversion 50%, recycle-to-purge ratio 10. Flow rate of A in purge stream is kmol h−1^{-1}.
GATE→2023→Process Calculations→Process Calculations
Q6
NAT[1 Mark]
Methane fed at 100100 mol hr−1^{-1} with 50%50\% conversion. Theoretical oxygen requirement is mol hr−1^{-1}.
GATE→2023→Process Calculations→Process Calculations
Q7
NAT[2 Marks]
Wet air with 10%10\% water vapor passed through CaCl2 pellets removing 50%50\% of water. Mole percent of water in product stream is.
GATE→2023→Process Calculations→Process Calculations
Q8
NAT[2 Marks]
Orsat dry-basis stack gas composition given. Wet-basis mole fraction of N2N_2 is.
GATE→2022→Process Calculations→Process Calculations
Q9
NAT[2 Marks]
CSTR process flowsheet with recycle and purge. Inert feed rate into the process is kmol h−1^{-1}.
Figure for Question 9