Cane Sugar Refining - Purolite

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Cane Sugar Refining with Ion Exchange Resins Cleaning of Organically Fouled Anion Resins 40 Caustic salt treatments to elute organic and other foulants from strongly basic anion exchangers. These treatments consist of a partial caustic regeneration and displacement, followed by warm (150°F) brine (15% NaCl) treatment. This is repeated as many as six times, or until the maximum color eluted during the brine step drops to one fifth of the highest color eluted (which occurs during the first treatment). The procedure is as follows: 1. The anion bed is backwashed as per usual. 2. Regenerate with warm 2% to 5% NaOH as usual, but the amount of caustic is limited to about one third of the normal dosage (1.0 to 2.0 lbs/ft 3 ), flowrate at about 0.2 gpm/ft 3 . 3. Slow rinse or displace for 10 minutes at the same 0.2 gpm/ft 3 . 4. Inject warm 10% to 15% NaCl solution (at 150 °F) at 6.5 to 8.0 lbs/ft 3 , also at 0.2 gpm/ft 3 flowrate. 5. Slow rinse or displace for 10 minutes at 0.2 gpm/ft 3 . Observe for the most concentrated salt (by hydrometer) in the effluent, at which time the color eluted will be the highest. 6. Without backwashing, repeat the above steps 2 through 5 several times, until the color eluted during the salting period drops to one fifth of that observed during the first treatment. Note: Although a mixture of 10% NaCl and 1% NaOH solution is effective for removing color, the above cyclic method is preferred. The alternate application of NaOH and NaCl causes alternate expansion and contraction of the resin, which loosens the coagulated or foreign matter from the beads by a mechanical or sponge action, as well as by the chemical elution. This procedure is best done on a regular or periodic schedule before the anion resin is appreciably fouled. If organic matter in the influent is high, this procedure may have to be done every 15 to 30 days. When heavy metals (such as Cu or Fe) are also present in the anion resin, concentrated 30% HCl may have to be applied (1.5 gallons of 30% HCl) as well. Hopefully the underdrain is not made from stainless steel, because HCl attacks it; in this case, the resin will have to be moved to a treatment vessel with a PVC/polypropylene screened underdrain.
TANK CAPACITIES DIA. FT. AREA SQ. FT. GALLONS PER FOOT OF DEPTH 41 Cane Sugar Refining with Ion Exchange Resins DIA. FT. AREA SQ. FT. GALLONS PER FOOT OF DEPTH 1.0 0.785 5.87 10.0 78.54 587.5 1.5 1.767 13.22 10.5 86.59 647.7 2.0 3.142 23.50 11.0 95.03 710.9 2.5 4.909 36.72 11.5 103.9 777.0 3.0 7.069 52.88 12.0 113.1 846.0 3.5 9.621 71.97 12.5 122.7 918.0 4.0 12.57 94.00 13.0 132.7 992.9 4.5 15.90 119.0 13.5 143.1 1071 5.0 19.63 146.9 14.0 153.9 1152 5.5 23.76 177.7 14.5 165.1 1235 6.0 28.27 211.5 15.0 176.7 1322 6.5 33.18 248.2 15.5 188.7 1412 7.0 38.48 287.9 16.0 201.1 1504 7.5 44.18 330.5 18.0 254.5 1904 8.0 50.27 376.0 20.0 314.2 2350 8.5 56.75 424.5 9.0 63.62 475.9 9.5 70.88 530.2
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Cane Sugar Refining - Purolite

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