Method for recovery of reusable chemicals from C10.sub.2 generator effluent
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United States of America Patent
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Nov 20, 1984
Grant Date -
N/A
app pub date -
Aug 3, 1983
filing date -
Aug 3, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Method for the recovery of acidic effluent from pulp mill chlorine dioxide generators using the Mathieson or Solvay system. The spent generator acid is directed through a three-stage evaporation/crystallization process in which spent acid from the generator is evaporated and crystallized to produce stage 1 sodium bisulfate crystals. The first stage crystals are then redissolved to form a second solution which is crystallized in order to yield stage 2 sodium sesquisulfate crystals and, finally, the second stage crystals are redissolved in a third stage evaporation/crystallization stage to yield sodium sulfate crystals. Besides salt cake, the system also produces reusable sulfuric acid for the chlorine dioxide generator. No chemicals are added during the recovery steps.
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