Pressurized hot water flow-through extraction of birch sawdust - Effects of sawdust density and sawdust size

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Petri Kilpeläinen, Veikko Kitunen, Jarl Hemming, Andrey Pranovich, Hannu Ilvesniemi, Stefan Willför
Förläggare: Mid Sweden University
Publiceringsår: 2014
Tidskrift: Nordic Pulp and Paper Research Journal
Tidskriftsakronym: NORD PULP PAP RES J
Volym: 29
Nummer: 4
Artikelns första sida, sidnummer: 547
Artikelns sista sida, sidnummer: 556
Antal sidor: 10
ISSN: 0283-2631
eISSN: 2000-0669


Abstrakt

Birch sawdust was extracted using a pressurized hot water (PHW) flow-through system, with the aim of recovering polymeric, water- soluble xylans. The extraction temperature was 180 degrees C for 60 min with a constant water flow through the extraction vessel. The sawdust was packed in the extraction vessel with densities in the range of 0.2 - 0.7 kg/l. Higher packing densities of birch sawdust gave higher concentration of extract. Higher sawdust densities had also lower liquid to wood ratios during extractions. The highest extract concentration peak was achieved with 0.5 kg/l density of birch sawdust. At the beginning of the higher density extractions, more xylans and lignin were extracted than lower densities. Birch sawdust with three different particle sizes was also extracted under the same conditions. The amounts of extracted xylans were higher for the smallest particle size. Higher sawdust densities decreased the difference in the extraction yield between different particle sizes of sawdust.


Nyckelord

Birch, Flow-through, Packing, Pressurized hot water extraction

Senast uppdaterad 2019-11-12 vid 01:45