Figure 27.

Theoretical effect of temperature on a plot of HETP vs. linear velocity. Conditions: The particle diameter is taken as 3 μm and the reduced linear velocity is based on diffusion at a fixed temperature ((D_m at 25 °C = 6*10^-7 cm²/s). The linear velocity (u) is increased and the reduced plate height is calculated from a modified Knox equation: $\mathrm{h}=\mathrm{A}+\frac{\mathrm{B}}{\mathrm{\nu }}+\mathrm{C}\mathrm{\nu }+\mathrm{D}{\mathrm{\nu }}^{2/3}+\frac{3{\mathrm{D}}_{\mathrm{m}}}{8{\mathrm{k}}_{\mathrm{d}}{\mathrm{d}}_{\mathrm{p}}^2}\mathrm{\nu }(\mathrm{A}=1.5,\mathrm{B}=0.8,\mathrm{C}=0.3,\mathrm{D}=0.04)$ at each velocity and temperature. Fast desorption kinetics are assumed (E_a = 20 kJ/mol, k_o = 1*10¹³s). From ref. [97].