Fig. $18\mathrm{.}4-1.$ Absorption of $A$ by $B$ with a

homogeneous reaction in the liquid phase.

tion, Eq$.19\mathrm{.}1-18$ becomes, aw

$(\frac{\text{d}\text{e}\text{l}{}_A}{\text{d}\text{e}\text{l}\text{t}}+(v*grad{}_A))=D_{AB}gra{d}^2{}_A+r_A$

$D_{AB}\frac{d^2{c}_A}{d{z}^2}-k_1^{\text{'}\text{'}\text{'}}{c}_A=0$