GATE CH Chemical Reaction Engineering PYQs & Answers — Page 6

Questions 51–60 of 70. Imported answers require independent review unless marked reviewed.

A first-order irreversible liquid phase reaction A → B (

min⁻¹) is carried out under isothermal, steady state conditions in the following reactor arrangement comprising an ideal CSTR (Continous-Stirred Tank Reactor) and two ideal PFRs (Plug Flow Reactors). From the information in the figure, the volume of the CSTR (in Liters) is __________ (rounded off to the nearest integer).

Diagram for Chemical Engineering question 46

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The elementary liquid-phase irreversible reactions

take place in an isothermal ideal CSTR (Continuous-Stirred Tank Reactor). Pure A is fed to the reactor at a concentration of 2 mol/Liter. For the residence time that maximizes the exit concentration of B, the percentage yield of B, defined as

, is __________ (rounded off to the nearest integer).

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The elementary irreversible gas-phase reaction A → B + C is carried out adiabatically in an ideal CSTR (Continuous Stirred Tank Reactor) operating at 10 atm. Pure A enters the CSTR at a flow rate of 10 mol/s and a temperature of 450 K. Assume A, B and C to be ideal gases. The specific heat capacity at constant pressure (

) and heat of formation (

), of component

(

), are:

The reaction rate constant

(per second)

, where

kJ/mol and universal gas constant

L atm/(mol K) = 8.314 J/(mol K). The shaft work may be neglected in the analysis, and specific heat capacities do not vary with temperature. All heats of formation are referenced to 273 K. The reactor volume (in Liters) for 75% conversion is __________ (rounded off to the nearest integer).

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Consider the reactor-separator-recycle process operating under steady state conditions as shown in the figure. The reactor is an ideal Continuous-Stirred Tank Reactor (CSTR), where the reaction A + B → C occurs. Assume that there is no impurity in the product and recycle streams. Other relevant information are provided in the figure.

Diagram for Chemical Engineering question 53

The mole fraction of B (

) in the reactor that minimizes the recycle rate is __________ (rounded off to two decimal places).

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Liquid phase isomerization of o-xylene to p-xylene using a zeolite catalyst was carried out in a CSTR. Three sets of kinetic data at different temperatures and stirring speeds were obtained as shown below.

	set A			set B			set C
temperature (K)	500	500	500	600	600	600	700	700	700
stirring speed (rpm)	1000	2000	3000	1000	2000	3000	1000	2000	3000
reaction rate (mol L⁻¹ s⁻¹)	0.020	0.025	0.025	0.037	0.047	0.047	0.069	0.078	0.086

The operating condition at which the reaction rate is not controlled by external mass transfer resistance is

Your answerChoose one option.

T = 500 K; rpm = 3000

T = 600 K; rpm = 1000

T = 700 K; rpm = 1000

T = 700 K; rpm = 2000

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The reactant (M) is converted into product (N) in the presence of catalyst in a fixed bed reactor. All the flow rates (F, G, H, P and R) in mol/s, and mole fraction of reactant (M) in these streams (x_F, x_G, x_H, x_P and x_R) are shown in the diagram.

Diagram for Chemical Engineering question 17

The overall fractional conversion is

Your answerChoose one option.

(x_G G − x_H H)/(x_G G)

(x_G G − x_P P)/(x_G G)

(x_F F − x_H H)/(x_F F)

(x_F F − x_P P)/(x_F F)

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For a chemical reaction, the ratio of rate constant at 500 K to that at 400 K is 2.5. Given R = 8.314 J mol⁻¹ K⁻¹, the value of activation energy (in kJ/mol) is

Your answerChoose one option.

10.5

12.0

15.2

18.4

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The ammonia (NH₃) oxidation process occurs over a catalyst as

4 NH₃ + 5 O₂ → 6 H₂O + 4 NO

Air is supplied such that oxygen (O₂) is 20% in excess of that required for complete conversion of NH₃. The mole fraction of O₂ in inlet gas mixture (NH₃ + air) is ______ (rounded off to third decimal place).

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In a laboratory batch setup, reaction of P over a catalyst was studied at various temperatures. The reactions occurring are

At the end of one hour of operation, the batch contains

and

mole fractions of P, Q and R components, respectively. The mole fractions of product components (

and

) were found to vary linearly with temperature as given in the figure.

Diagram for Chemical Engineering question 33

If the yield of Q based on reactant P consumed (

) at 25 °C was found to be 0.40, then the value of

at 60 °C is __________ (rounded off to second decimal place).

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A CSTR and a PFR of equal volume are connected in series as shown below to carry out a first-order, isothermal, liquid phase reaction

Diagram for Chemical Engineering question 39

The rate constant is 0.2 s⁻¹. The space-time is 5 s for both the reactors. The overall fractional conversion of A is ____________ (rounded off to third decimal place).

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GATE CH Chemical Reaction Engineering PYQs

Question 46

Question 47

Question 48

Question 53

Question 15

Question 17

Question 21

Question 24

Question 33

Question 39