METHOD FOR TREATING SLURRY OF COMMINUTED CELLULOSIC FIBROUS MATERIAL

PROBLEM TO BE SOLVED: To produce fully bleached (typically having a whiteness degree of over 89 or more 90% ISO) cellulose pulp from an environmentally friendly (ECF), yet commercially viabled comminuted cellulosic fibrous material. SOLUTION: A method for producing bleached chemical pulp from commin...

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Bibliographische Detailangaben
1. Verfasser:	STROEMBERG BERTIL C
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:	PROBLEM TO BE SOLVED: To produce fully bleached (typically having a whiteness degree of over 89 or more 90% ISO) cellulose pulp from an environmentally friendly (ECF), yet commercially viabled comminuted cellulosic fibrous material. SOLUTION: A method for producing bleached chemical pulp from comminuted cellulosic fibrous material comprises: (a) treating the material in a chemical pulping process in the presence of chemical additive to produce a chemical pulp containing at least some of the additive; (b) treating the chemical pulp with at least one elemental-chlorine-free bleaching agent to produce a bleached chemical pulp having at least some discoloration due to the presence of the chemical additive; and (c) treating the bleached pulp with at least one oxidizing agent to remove the discoloration produced by the presence of the chemical additive. COPYRIGHT: (C)2009,JPO&INPIT