| 摘要 |
A slurry of sodium acid sulfate crystals generally from a chlorine dioxide generating process, is metathesized on no more than one drum filter. The crystals are fed to a first filtration zone on the filter wherein the crystals are separated from the slurry. The crystals are contacted with an aqueous metathesizing medium to effect solid phase conversion of the sodium acid sulfate crystals to neutral sodium sulfate crystals. The resulting slurry is fed to a second filtration zone on the drum filter element separate from the first filtration zone, wherein the neutral sodium sulfate crystals are separated from the acidic medium formed in the metathesis step. The employment of a single dual service drum filter provides a simplification and cost reduction compared to conventional procedures and to also a minimization or elimination of the impact imposed by the additional evaporative load on the chlorine dioxide generator.
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