VERFAHREN ZUM BLEICHEN VON LIGNOCELLULOSE ENTHALTENDEM MATERIAL

The present invention relates to a process for delignification and bleaching of chemically digested lignocellulose-containing pulp for reduced formation and discharge of halogenated organic compounds, while preserving the pulp quality, where the prebleaching with halogen-containing bleaching agent i...

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Bibliographische Detailangaben
Hauptverfasser:	BASTA, JIRI J., S-433 46 PARTILLE, SE, SAMUELSSON, MARIE R., S-444 43 STENUNGSUND, SE, HOLTINGER, LILLEMOR K., S-440 45 NOEDINGE, SE, LUNDGREN, PER G., S-430 22 VAEROEBACKA, SE
Format:	Patent
Sprache:	ger
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:	The present invention relates to a process for delignification and bleaching of chemically digested lignocellulose-containing pulp for reduced formation and discharge of halogenated organic compounds, while preserving the pulp quality, where the prebleaching with halogen-containing bleaching agent is replaced by a treatment, in a first step, with the addition of a complexing agent at elevated temperature and at a pH from 3.1 to 9.0, and in a second step, by using a peroxide-containing compound under alkaline conditions, whereupon spent liquor from the final bleaching with halogen-containing compounds is recycled to the first or second step of the halogen-free prebleaching.