SELECTIVE WHITE LIQUOR OXIDATION

A method for white liquor oxidation in a kraft mill utilizes a two-stage selective oxidation system in which the first stage (108) is operated to remove sulfide while the second stage (107) is operated to oxidize a significant fraction of the remaining oxidizable sulfur compounds to sulfate. The res...

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Bibliographische Detailangaben
Hauptverfasser:	MAGNOTTA, VINCENT L, NADDEO, RONALD C, FOX, VIRGIL G, AYALA, VARIN, CIRUCCI, JOHN F
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR PAPER-MAKING PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS REGENERATION OF PULPING LIQUORS TEXTILES
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Beschreibung
Zusammenfassung:	A method for white liquor oxidation in a kraft mill utilizes a two-stage selective oxidation system in which the first stage (108) is operated to remove sulfide while the second stage (107) is operated to oxidize a significant fraction of the remaining oxidizable sulfur compounds to sulfate. The resulting selectively oxidized white liquor (21) products are used as alkali sources for various process steps in the mill. Optionally, white liquor can be oxidized in a single stage to convert a significant fraction of the oxidizable sulfur compounds to sulfate. Methods for controlling the selective oxidation process are disclosed.