METHOD FOR EXTRACTING HEMICELLULOSE FROM LIGNOCELLULOSIC MATERIAL

METHOD FOR EXTRACTING HEMICELLULOSE FROM LIGNOCELLULOSIC MATERIAL

The present invention relates to a method for extracting hemicellulose from lignocellulosic material, the method comprising: a) providing (11) lignocellulosic material in a digester, b) supplying (12) steam to the digester, c) performing (13) hydrolysis of the lignocellulosic material in the digeste...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: LAMMI, Lari, KARVONEN, Jouni, MINNAAR, Susanna, LANDMAN, Hunphrey, WAUTS, Johann, COETZEE, Berdine
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
APPARATUS THEREFOR
CHEMISTRY
COMPOSITIONS BASED THEREON
DERIVATIVES THEREOF
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PAPER-MAKING
POLYSACCHARIDES
PRODUCTION OF CELLULOSE
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS
REGENERATION OF PULPING LIQUORS
TEXTILES
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:The present invention relates to a method for extracting hemicellulose from lignocellulosic material, the method comprising: a) providing (11) lignocellulosic material in a digester, b) supplying (12) steam to the digester, c) performing (13) hydrolysis of the lignocellulosic material in the digester until a first P-factor is reached, d) supplying (14) a first liquid to the digester for mixing with the lignocellulosic material, wherein a total volume of the first liquid is at least equal to a volume required to cover the lignocellulosic material in the digester after the hydrolysis of step c), wherein the first liquid is water or condensate, and e) draining (15) the first liquid from the digester for extracting hemicellulose from the lignocellulosic material, wherein the supplying of liquid in step d) takes less than 15 minutes, preferably less than 10 minutes, and wherein the draining of the first liquid during step e) is performed in less than 15 minutes, preferably less than 10 minutes.