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Dissolving pulp from TCF bleached Acetosolv beech pulp
Author(s) -
Vila Carlos,
Santos Valentín,
Parajó Juan Carlos
Publication year - 2004
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1090
Subject(s) - kappa number , pulp (tooth) , peracetic acid , acetic acid , chemistry , dissolving pulp , beech , pulp and paper industry , aqueous solution , hydrogen peroxide , nuclear chemistry , chlorine dioxide , carboxymethyl cellulose , peroxide , cellulose , organic chemistry , kraft process , kraft paper , botany , pathology , sodium , medicine , biology , engineering
Beech wood samples subjected to pulping in HCl‐catalysed acetic acid media (Acetosolv process) under selected conditions were bleached using several Totally Chlorine Free (TCF) sequences including peracetic acid (Paa), alkaline (E), oxygen (O), chelating (Q) and peroxide (P) treatments. PaaEQPP sequences starting from acetic acid media led to pulps with poor brightness, which was improved when the same sequence was carried out starting from aqueous media. An EOQPP sequence led to a pulp with acceptable properties, which were improved by a optimised EOQPaaP sequence, in which a fully bleached pulp was obtained at a SCAN viscosity of 604 cm 3 g −1 . EOQPaaP‐bleached pulp was explored for carboxymethyl cellulose (CMC) manufacture employing heterogeneous conditions in isopropanol media, and a CMC with a degree of substitution of 1.16 was obtained. Copyright © 2004 Society of Chemical Industry