Intensification of hemicellulose hot-water extraction from spruce wood in a batch extractor - effects of wood particle size

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Jens Krogell, Ekaterina Korotkova, Kari Eränen, Andrey Pranovich, Tapio Salmi, Dmitry Murzin, Stefan Willför
Förläggare: ELSEVIER SCI LTD
Publiceringsår: 2013
Tidskrift: Bioresource Technology
Tidskriftsakronym: BIORESOURCE TECHNOL
Volym: 143
Artikelns första sida, sidnummer: 212
Artikelns sista sida, sidnummer: 220
Antal sidor: 9
ISSN: 0960-8524
eISSN: 1873-2976


Abstrakt

The effect of five different wood particle size fractions between 0.5 and 12.5 mm on hot-water extraction of acetylated water-soluble hemicelluloses from spruce wood with a batch extraction setup at 170 degrees C was investigated. Extraction kinetics, with regard to particle size, was also studied. The purpose was to intensify the hemicellulose extraction for high molar mass hemicelluloses at high yield and purity. About 30% of the wood was dissolved and basically all the hemicelluloses could be extracted. The average molar masses of the extracted hemicelluloses decreased rapidly during the first 10 min of the extraction, but were not much affected by the difference in wood particle sizes. Smaller particles resulted in higher extraction rates. The reaction order was established to be of pseudo-first order for particles above 2 mm and 1.5st order for particles smaller than 2 mm. The effective diffusion coefficient was determined to be 9.11 x 10(-10) m(2)/s.


Nyckelord

Extraction kinetics, Hemicellulose, Hot-water extraction, Particle size, Spruce wood

Senast uppdaterad 2019-11-12 vid 03:16