GATE CH topic:chemical-reaction-engineering PYQs & Answers — Page 7

Questions 61–70 of 70. Imported answers require independent review unless marked reviewed.

The elementary second-order liquid phase reaction A + B → C + D is carried out in an isothermal plug flow reactor of 2 m³ volume. The inlet volumetric flow rate is 10 m³/h. The initial concentrations of both A and B are 2 kmol/m³. The rate constant is given as 2.5 m³ kmol⁻¹ h⁻¹. The percentage conversion of A is __________.

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A set of standard stainless steel pipes, each of internal diameter 26.65 mm and 600 mm length, is used to make a plug flow reactor by joining them in series to carry out degradation of polyethylene. Seven such pipes are required to obtain a conversion of 66% at 450 K. The minimum number of standard 800 mm long pipes of the same internal diameter to be procured for obtaining at least 66% conversion under the same reaction conditions is __________.

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Hydrogenation of benzene is to be carried out using Ni (density = 910 kg/m³) as catalyst, cast in the form of non-porous hollow cylinders, as shown below. The reaction occurs on all the surfaces of the hollow cylinder. During an experiment, one such cylinder is suspended in the reactant stream. If the observed rate of reaction is 0.39 mol (m² of catalyst surface)⁻¹ min⁻¹, then the rate of reaction in mol (kg of catalyst)⁻¹ min⁻¹ is ____________ (rounded off to three decimal places).

Diagram for Chemical Engineering question 52

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The following reaction rate curve is shown for a reaction A → P. Here,

and

represent reaction rate and conversion, respectively. The feed is pure A and 90% conversion is desired.

Diagram for Chemical Engineering question 17

Which amongst the following reactor configurations gives the lowest total volume of the reactor(s)?

Your answerChoose one option.

CSTR followed by PFR

Two CSTRs in series

PFR followed by CSTR

A single PFR

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Consider a first order catalytic reaction in a porous catalyst pellet. Given

– characteristic length of the pellet;

– effective diffusivity;

– mass transfer coefficient;

– rate constant based on volume of the catalyst pellet;

– concentration of reactant on the pellet surface.

The expression for Thiele modulus is

Your answerChoose one option.

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For a solid-catalyzed gas phase reversible reaction, which of the following statements is ALWAYS TRUE?

Your answerChoose one option.

Adsorption is rate-limiting

Desorption is rate-limiting

Solid catalyst does not affect equilibrium conversion

Temperature does not affect equilibrium conversion

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The C-curve measured during a pulse tracer experiment is shown below. In the figure,

is the concentration of the tracer measured at the reactor exit in mol/liter at time

seconds.

Diagram for Chemical Engineering question 46

The mean residence time in the reactor, rounded to 1 decimal place, is _____ s.

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The following liquid phase second-order reaction is carried out in an isothermal CSTR at steady state

where

is the concentration of the reactant in the CSTR. The reactor volume is 2 m

, the inlet flowrate is 0.5 m

/hr and the inlet concentration of the reactant is 1000 mol/m

. The fractional conversion, rounded to 2 decimal places, is ______ .

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The reversible reaction of t-butyl alcohol (TBA) and ethanol (EtOH) to ethyl t-butyl ether (ETBE) is

The equilibrium constant for this reaction is

. Initially, 74 g of TBA is mixed with 100 g of aqueous solution containing 46 weight% ethanol. The molecular weights are: 74 g/mol for TBA, 46 g/mol for EtOH, 102 g/mol for ETBE, and 18 g/mol for water. The mass of ETBE at equilibrium, rounded to 1 decimal place, is _____ g.

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The following gas-phase reaction is carried out in a constant-volume isothermal batch reactor

The reactants A and B as well as the product S are non-condensable gases. At the operating temperature, the saturation pressure of the product R is 40 kPa. Initially, the batch reactor contains equimolar amounts of A and B (and no products) at a total pressure of 100 kPa. The initial concentrations of the reactants are

. The rate of reaction is given by

. The time at which R just starts condensing, rounded to 1 decimal place, is ________ s.

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GATE CH topic:chemical-reaction-engineering PYQs

Question 40

Question 51

Question 52

Question 17

Question 18

Question 19

Question 46

Question 47

Question 48

Question 49