Cane Sugar Refining - Purolite

Cane Sugar Refining with Ion Exchange Resins
20
PSI/Ft bed depth
Pressure Drop of Mixed Bed 1/3 C-115EC(H+) + 2/3 PFA-500S(OH-)
67˚ Brix Sucrose, 60˚ C, 1.85 Foot Bed Depth
y = 2.0454x + 0.3617
5.0
4.0
3.0
2.0
1.0
0
0.5 1.0 1.5 2.0 2.5
Flow Rate, Gal/Ft*2/Min
2. Strong Base Anion / Weak Acid Cation Two Bed
The sucrose solution can be decolorized and demineralized by passing first through a bed
of strong base anion (OH- form) to convert all the salts to base and then passing through
a separate bed of high pK weak acid cation resin which will exchange the cations and
neutralize the base. The weak acid cation effluent pH will be approximately 4.0 and must
be either blended with a sidestream of syrup to bring the pH up to avoid inversion or run
through a SAC (Na) to exchange H+ for Na+ or run through a WBA to adsorb acidity.
In order to avoid precipitation of Mg(OH) 2 or CaCO 3 in the resin bed, either a cation
resin can be used to soften the syrup or the anion can be run in the HCO 3 – form which
will produce more highly soluble bicarbonate salts. Conductivity reduction and color
removal will be somewhat less in the HCO 3 – form.
50 – 200 ICUMSA
0.15 – 0.25% Ash
68° Brix
50° C
A500S
(OH)
C115E (H)
5 – 20 ICUMSA