Page 254 - Principles of Catalyst Development

244 APPENDIX 3
Conversion
Quantity Symbol Common units SI Units factor
Mass of catalyst W g kg 1000E + 3
Volumetric flow rate Fo cm'/s m's 1.000E - 6
Contact time T 1.000EOO
Space velocity S s 1 I.OOOEOO
Gas hourly space GHSV cm'/em' \cat)/hr 2.778E-4
velocity
Liquid hourly space LHSV em '/em' (cat)/hr S-I 2.778E - 4
velocity
Fractional conversion X A
Reaction rate -K, mole/cm 3 (cat) s mole m- 3 S-I 1.000E + 3
Turnover number N mol! site sec mol/site- I s - I 1.000EOO
Selectivity S
Yield Y
Order of reaction n, rn
First-order rate kv s 1 S -- I I.OOOEOO
constant kg cm' / g s m' kg- 1 s--' 1.000E - 3
k, cmls ms" 1.0000E - 2
Activation energy E kcal/mole J mole"l 4.187 E + 3
4. CATALYST PROPERTIES
Particle radius Rp em m , 1.000E - 2
Particle volume V, em' m' 1.000E - 6
Pore volume Vg cm'/g m' kg-I 1.000E - 3
Macro porosity eM
Meso porosity e"
Average pore radius ',. AO nm 1.000E - 1
Specific heat ('p cal/g °C J kg-' K 1 4.187E+3
Thermal conductivity k eal/em s 'C 1m' 1 S-I K" 4.187E+2
Theoretical density d, g/cm' (solid) kgm- 1 1.000E + 3
Particle density dp g/ em' (particle) kgm " 1.000E + 3
Packing density dB g/cm 3 (bed) kgm'-3 1.000E + 3
External pellet area Sext m'/g (particle) m 2 kg- 1 1.000E + J
Crushing strength F kgf/cm' Pa 9.807E+4
5. CATALYTIC REACTORS
Reactor length L em m 1.000E - 2
Reactor radius R em m 1.000E - 2
Reactor volume V R em' m' 1.000E - 6
FlUid velocity U cmls ms- I 1.000E - 2
Mass velocity G g/s em' (total) kgs ' m- 2 1.000E + I
Fluid viscosity I-'- poise Nsm- 2 1000E - 1
Fluid thermal k cal/ em s 'C 1m ' 5 - ' K- 1 4.187E+2
conductivity
Fluid heat capacity C/. cal/mole 'C 1 mole , 1 K-1 4.187EOO
Fluid density g/cm' kgm 1.000E + 3
Void fraction E
Reynolds number N Ro
Schmidt number Ns,
Prandtl number NI'l
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