The two$-$phase isothermal reaction,

$A+R+SB+RR+R$

is carried out at $100C$ in a batch reactor. Amorphous reactant $A$

and a small amount of crystalline product, $R,$ are dissolved in a

solvent, $C,$ and produce intermediate products $P$ and $Q.$ The rate

equation is given as$,$

$-r_A=\frac{k_2(C_{SO}{)}^{k_1}{C}_A{C}_R}{k_3{C}_R+(k_3+1)C_A}$

where $C_A$ and $C_R$ are the concentrations of solid reactant and

product in $kg.m^{-3},$ and $C_{so}$ is the initial solvent concentration in

kmol.$m^{-3}.$