CELLULOSE ACETATE, AND METHOD AND DEVICE FOR PRODUCING CELLULOSE ACETATE

CELLULOSE ACETATE, AND METHOD AND DEVICE FOR PRODUCING CELLULOSE ACETATE

An object is to provide a cellulose acetate remarkably good in hue even when a low-quality pulp is used. A method for producing the cellulose acetate includes a step (1) of crushing a wood pulp, a step (2) of bringing the crushed wood pulp into contact with acetic acid to subject the pulp to pretrea...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: TAMAGAKI, Hiroaki, KUWANA, Akihiro
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
CHEMISTRY
COMPOSITIONS BASED THEREON
DERIVATIVES THEREOF
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
POLYSACCHARIDES
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:An object is to provide a cellulose acetate remarkably good in hue even when a low-quality pulp is used. A method for producing the cellulose acetate includes a step (1) of crushing a wood pulp, a step (2) of bringing the crushed wood pulp into contact with acetic acid to subject the pulp to pretreat the wood pulp, a step (3) of causing the wood pulp to react with acetic anhydride after the pretreatment to acetylate the pulp, a step (4) of hydrolyzing the cellulose acetate, which is yielded by the acetylation, and a step (5) of precipitating the cellulose acetate, an acetylation degree of which is adjusted by the hydrolysis. In the hydrolyzing step (4), in a hydrolysis reaction system, a concentration of oxygen is set to 3% or less.