| 摘要 |
Volatile organic components are removed from the effluent liquor of an acid sulfite digestion process by concentrating the effluent liquor in multiple stages to form an organic-rich aqueous fraction, an organic-lean aqueous fraction and a high solids content fraction, continuously withdrawing the organic-lean and high solids content fraction from the recovery process, continuously recycling the organic-rich fraction to the digestion step to form a closed loop which acts to build up the concentration of volatile organic components, and continuously separating and withdrawing from the closed loop the bulk of the volatile organic components in a stream more concentrated than that of the closed loop.
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