METHOD FOR TREATING SLURRY OF COMMINUTED CELLULOSIC FIBROUS MATERIAL

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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1. Verfasser: STROEMBERG BERTIL C
Format: Patent
Sprache:eng
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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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creator STROEMBERG BERTIL C
description 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
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subjects APPARATUS THEREFOR
PAPER-MAKING
PRODUCTION OF CELLULOSE
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS
REGENERATION OF PULPING LIQUORS
TEXTILES
title METHOD FOR TREATING SLURRY OF COMMINUTED CELLULOSIC FIBROUS MATERIAL
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