Page 15 - Pressure Swing Adsorption

XlV
LIST OF SYMBOLS
fraction of complete purge
mole fraction of A in gas phase
average mole fraction (of raffinate product B) in blowdown gas
average mole fract10n (of raffinate product B) in high-pressure
product stream
z axial distance Greek Symb.ols
z dimensionless axial distance z / L

a permeability ratio Cintnns1c seoaratJon factor); i /( t + i ) (in
11
11
1
Table 5.9)
a' seoarat1on factor x(l - y)/y(l - x) or y(l - x);x(l - v)
ak kinetic select1v1ty (effect1ve)-see E(1. 2.46
f3 parameter charactenzmg heat effect [(t>H/C,Xaa* ;an,,J 111 Ee,. 2.46;
adsorptmn selectivity parameter {3A/f3 , b;C ·
8
/3; rat10 of hold-up cornoonent ; m void soace as fraction of total hold-up
[l + ((1 - e)/e)KJ-•
'Y ratio of gas heat capacities at constant pressure and constant volume
-YE ratio of Langmmr constants b 8 /bA
-Yk ratio of microoore diffus1v1t1es Dcs/DcA
"Ys ratio of saturatmn capacities q 85 /qAs
r dimensionless parameter (rz/DA,)(3k,/Rp)(C/qA)
f' dimens1onless parameter (rc/DAcXC/qAs)kr
£ voidage of adsorbent bed
cP porosity of adsorbent particle
C ll + fPHYF/3A,O - /3W' (Chapter 4)
17 mechanical efficiency of compress1on; dimensionless radiai coordinate
R/R,
8 adsorot1on select1v1ty parameter 8 A/ 0 n
0 dimensmnless concentration qjq , (Chapters 2 and 5); parameter
1 1
0; (P, Y,, y,) ~ [I + ((! - t:lj,)(([; 2 - [;, )/( Y,2 -- Y; ))( RT /P,,W '.
1
where 1 and 2 refer to arbitrary states (Chapter 4)