Recent activity in Chemical Reaction Engineering

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 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...

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_...

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

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...

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...

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...

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...

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...

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)...

​​​​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 ...

​​​​​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 ...

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...

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

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...

​​​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...

​​​​​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...

​​​​​​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 ...

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...

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

​​​​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 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...

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...

$\mathrm{CO}$ 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 ...

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

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

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...

In an enzymatic reaction, an inhibitor $(I)$ competes with the substrate $(S)$ to bind with the enzyme $(E)$, thereby reducing the rate of product $(P)$ formation. The co...

The reaction $A \rightarrow B$ is carried out isothermally on a porous catalyst. The intrinsic reaction rate is $kC_{A}^{2}$, where $k$ is the rate constant and $C_{A}$ i...

Consider the process flowsheet in the figure. An irreversible liquid-phase reaction $A \rightarrow B$ (reaction rate $-r_{A} = 164 \:x_{A}\text{ kmol }m^{-3}\:h^{-1}$) oc...

An elementary irreversible liquid-phase reaction, $2P \overset{k}{\rightarrow}Q$, where the rate constant $k = 2\:L\:\text{mol}^{-1}\:\text{min} ^{-1}$, takes place in an...

An elementary irreversıble gas-phase reaction, $A \rightarrow B + C$, is carried out at fixed temperature and pressure in two separate ideal reactors: $(i)$ a $10\:m^{3}$...

An elementary irreversible liquid-phase reaction, $2A \rightarrow B$, is carried out under isothermal conditions in a $1\:m^{3}$ ideal plug flow reactor $\text{(PFR)}$ as...

Consider the process in the figure. The liquid phase elementary reactions $$A + B \rightarrow P \:\:\:\: -r_{B1} = k_{1}\:x_{A}\:x_{B}$$ $$P + B \rightarrow S \:\:\:\: -r...

Ethylene adsorbs on the vacant active sites $V$ of a transition metal catalyst according to the following mechanism.If $N_T, N_V$ and $N_{C_2H_4}$ denote the total number...

The following homogeneous liquid phase reactions are at equilibrium,The values of rate constants are given by: $k_1 = 0.1 s^{-1}$, $k_{-1}=0.2 s^{-1}, k_2 = 1 s^{-1}, k_{...

The following isothermal autocatalytic reaction $$ A +B \longrightarrow 2B \quad\quad\quad(-r_A)=0.1C_AC_B(\text{mol } L^{-1} s^{-1})$$is carried out in an ideal continuo...

Reactant $A$ decomposes to products $B$ and $C$ in the presence of an enzyme in a well-stirred batch reactor. The kinetic rate expression is given by$$-r_A = \dfrac{0.01C...

The following homogeneous, irreversible reaction involving ideal gases, $$A \longrightarrow B+C \quad\quad\quad(-r_A)=0.5C_A (\text{mol L}^{-1} s^{-1})$$ is carried out i...