Recent questions tagged chemical-reaction-engineering

An irreversible chemical reaction occurs on a porous catalyst. All the pores are of same size. In strong pore diffusion regime, the observed activation energy is $120 \ma...

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?Recycle elimi...

Consider a homogeneous gas phase reaction, $\mathrm{A}+2 \mathrm{~B} \rightarrow 2 \mathrm{C}+3 \mathrm{D}$, occurring at constant temperature and pressure in a varying v...

Consider the following homogeneous isothermal liquid-phase parallel reactions carried out in three reactor configurations (having identical volumes and same operating tem...

The reaction rate constants of two reactions follow Arrhenius' law. The activation energies of Reaction $1$ and Reaction $2$ are $E_{1}$ and $E_{2}$, respectively and $E_...

A first-order homogeneous liquid-phase reaction ( $\mathrm{A} \rightarrow \mathrm{B}$ ) occurs in an adiabatic, ideal mixed flow reactor operating at steady state. The vo...

A first-order homogeneous liquid-phase reaction ( $\mathrm{A} \rightarrow \mathrm{B}$ ) occurs in a non-ideal isothermal reactor operating at steady state. The variance (...

A feed containing $10 \mathrm{~mol} \%$ propylene, $15 \mathrm{~mol} \%$ ammonia and rest air is charged into a reactor to produce acrylonitrile $\left(\mathrm{C}_{3} \ma...

Cyclohexane $\left(\mathrm{C}_{6} \mathrm{H}_{12}\right)$ is produced from benzene $\left(\mathrm{C}_{6} \mathrm{H}_{6}\right)$ and hydrogen $\left(\mathrm{H}_{2}\right)$...

​​​Choose the CORRECT ordering of the diameter $d$ of the different types of pores in a solid catalyst.$d_{\text {Micro-pore }} < d_{\text {Macro-pore }} < d_{\text {Meso...

Choose the CORRECT statement that describes the dependence of the variance $\left(\sigma_{\Theta}^{2}\right)$ of the residence time distribution (RTD) with respect to th...

​​​​In the production of polyvinyl chloride (PVC) from ethylene and chlorine, the sequential order of reactions isChlorination followed by DehydrochlorinationDehydrochlor...

​​​​​In the CONTACT PROCESS for manufacturing sulphuric acid, the reaction converting $\mathrm{SO}_{2}$ to $\mathrm{SO}_{3}$ isExothermic and reversibleEndothermic and re...

​​​​Choose the option that correctly matches the items in Group $1$ with those in Group $2$.$$\begin{array}{|l|l|}\hline \textbf{ Group 1 } & \textbf{ Group 2 } \\\hline ...

​​​​Consider an enzymatic reaction that follows Michaelis-Menten kinetics. Let $K_{M}, S$, and $V_{\max }$ denote the Michaelis constant, substrate concentration, and max...

The residence-time distribution (RTD) function of a reactor $\left(\right.$ in $\left.\min ^{-1}\right)$ is$$ E(t)=\left\{\begin{array}{ll}1-2 t, & t \leq 0.5 \mathrm{~mi...

​​​​The first-order irreversible liquid phase reaction $A \rightarrow B$ occurs inside a constant volume $(V)$ isothermal CSTR with the initial steady state conditions sh...

​​​​​A catalyst particle is modeled as a symmetrical double cone solid as shown in the figure. For each conical sub-part, the radius of the base is $r$ and the height is ...

​​​​A zero-order gas phase reaction $A \rightarrow B$ with rate $\left(-r_{A}\right)=k=100 \mathrm{~mol} /(\mathrm{L \: min )}$ is carried out in a mixed flow reactor of ...

The reaction $A \: \rightarrow$ products with reaction rate, $\left(-r_{A}\right)=k C_{A}^{3}$, occurs in an isothermal PFR operating at steady state. The conversion $(X)...

The catalytic gas phase reaction $A \rightarrow$ products is carried out in an isothermal batch reactor of $10 \: \mathrm{L}$ volume using $0.1 \: \mathrm{kg}$ of a soli...

Methanol is produced by the reversible, gas-phase hydrogenation of carbon monoxide as$$ \mathrm{CO}+2 \mathrm{H}_{2} \leftrightarrow \mathrm{CH}_{3} \mathrm{OH}$$$\mathrm...

Consider the flowsheet in the figure for manufacturing $C$ via the reaction $A+B \rightarrow C$ in an isothermal CSTR. The split in the separator is perfect so that the r...

​​​​​A homogeneous azeotropic distillation process separates an azeotropic $AB$ binary feed using a heavy entrainer, $E$, as shown in the figure. The loss of $E$ in the t...

The ratio of the activation energy of a chemical reaction to the universal gas constant is $1000 \mathrm{~K}$. The temperature-dependence of the reaction rate constant fo...

​​​​​​The rate of a reaction $A \rightarrow B$ is $0.2 \mathrm{~mol} \mathrm{~m}^{-3} \mathrm{~s}^{-1}$ at a particular concentration $C_{A 1}$. The rate constant of the ...

​​​​​Two parallel first-order liquid phase reactions $A \xrightarrow{k_{1}} B$ and $A \xrightarrow{k_{2}} C$ are carried out in a well-mixed isothermal batch reactor. The...

​​​​​Consider the control structure for the overhead section of a distillation column shown in the figure. The composition controller (CC) controls the heavy key impurity...

Consider the reaction $\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(g) \rightleftharpoons 2 \mathrm{NH}_{3}(g)$ in a continuous flow reactor under steady-state conditions...

A first-order heterogenous reaction $A \rightarrow B$ is carried out using a porous spherical catalyst. Assume isothermal conditions, and that intraphase diffusion contro...

​​​​​​A first-order liquid phase reaction $A \rightarrow B$ is carried out in two isothermal plug flow reactors (PFRs) of volume $1 \mathrm{~m}^{3}$ each, connected in se...

​​​​The residence time distribution, $E$, for a non-ideal flow reactor is given in the figure. A first-order liquid phase reaction with a rate constant $0.2 \mathrm{~min}...

A chemostat with cell recycle is shown in the figure. The feed flow rate and culture volume are $F=75 \mathrm{~L} \mathrm{~h}^{-1}$ and $V=200 \mathrm{~L}$, respectively....

For a reversible endothermic chemical reaction with constant heat of reaction over the operating temperature range, $K$ is the thermodynamic equilibrium constant. Which o...

An isothermal jacketed continous stirred tank reactor (CSTR) operating at $150^{\circ} \mathrm{C}$ is shown in the figure below. The cold feed entering the system at $30^...

$\mathrm{CO}$ and $\mathrm{H}_2$ participate in a catalytic reaction. The partial pressures (in atm) of the reacting species $\mathrm{CO}$ and $\mathrm{H}_2$ in the feed ...

Fresh catalyst is loaded into a reactor before the start of the following catalytic reaction.$$\textbf{A} \longrightarrow \textbf{products}$$The catalyst gets deactivated...

A unimolecular, irreversible liquid-phase reaction$$\boldsymbol{A} \longrightarrow \boldsymbol{P}$$was carried out in an ideal batch reactor at temperature $T$. The rate ...

An irreversible liquid-phase second-order reaction$$\boldsymbol{A} \stackrel{k}{\longrightarrow} \boldsymbol{B}$$with rate constant $k=0.2$ liter. $\mathrm{mol}^{-1} \mat...