Stepwise hot water and alkali extraction of birch sawdust to produce xylan and cellulose

Marjatta Kleen, Marjo Määttänen, Sari Asikainen, Tiina Liitiä, Mia Tehomaa

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

4 Citations (Scopus)

Abstract

In order to dissolve xylan with high yield, but also to preserve the average molar mass of the dissolved xylan as high as possible, stepwise pressurized hot water extraction (HWE) followed by alkali extraction was applied to industrial birch sawdust in a semi-pilot scale apparatus. This process revealed that the hot water extraction at 160°C for 2 h was the most effective step to dissolve xylan. The total extraction process dissolved 99% of the native xylan. HWE at 160°C for 30 min released material with the highest weight average molar mass (Mw 12-14 kDa), and consisting mainly of xylan. The extraction residue, containing mainly cellulose (76%) and lignin (21%), was delignified and bleached to remove the residual lignin and to produce hemicellulose-and lignin-free cellulose. After soda pulping and oxygen and chlorine dioxide bleaching, the pulp had kappa number 0.85 and ISO-brightness 79.8%. The cooking and bleaching process should be further optimized. (10 refs.)
Original languageEnglish
Title of host publicationProceedings
Subtitle of host publication16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC
Pages666-671
Volume1
Publication statusPublished - 2011
MoE publication typeA4 Article in a conference publication
Event16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC - Tianjin, China
Duration: 8 Jun 201110 Jun 2011

Conference

Conference16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC
Abbreviated title16th ISWFPC
CountryChina
CityTianjin
Period8/06/1110/06/11

Fingerprint

xylan
sawdust
Betula
alkalis
cellulose
lignin
water
bleaching
soda pulping
molecular weight
chlorine dioxide
hemicellulose
pulp
preserves
cooking
oxygen

Keywords

  • alkali extraction
  • betula verrucosa
  • bleaching
  • birch sawdust
  • cellulose
  • hot water extraction
  • lignin
  • molar mass
  • pressurized extraction
  • pulping
  • xylan

Cite this

Kleen, M., Määttänen, M., Asikainen, S., Liitiä, T., & Tehomaa, M. (2011). Stepwise hot water and alkali extraction of birch sawdust to produce xylan and cellulose. In Proceedings: 16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC (Vol. 1, pp. 666-671)
Kleen, Marjatta ; Määttänen, Marjo ; Asikainen, Sari ; Liitiä, Tiina ; Tehomaa, Mia. / Stepwise hot water and alkali extraction of birch sawdust to produce xylan and cellulose. Proceedings: 16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC. Vol. 1 2011. pp. 666-671
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title = "Stepwise hot water and alkali extraction of birch sawdust to produce xylan and cellulose",
abstract = "In order to dissolve xylan with high yield, but also to preserve the average molar mass of the dissolved xylan as high as possible, stepwise pressurized hot water extraction (HWE) followed by alkali extraction was applied to industrial birch sawdust in a semi-pilot scale apparatus. This process revealed that the hot water extraction at 160°C for 2 h was the most effective step to dissolve xylan. The total extraction process dissolved 99{\%} of the native xylan. HWE at 160°C for 30 min released material with the highest weight average molar mass (Mw 12-14 kDa), and consisting mainly of xylan. The extraction residue, containing mainly cellulose (76{\%}) and lignin (21{\%}), was delignified and bleached to remove the residual lignin and to produce hemicellulose-and lignin-free cellulose. After soda pulping and oxygen and chlorine dioxide bleaching, the pulp had kappa number 0.85 and ISO-brightness 79.8{\%}. The cooking and bleaching process should be further optimized. (10 refs.)",
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author = "Marjatta Kleen and Marjo M{\"a}{\"a}tt{\"a}nen and Sari Asikainen and Tiina Liiti{\"a} and Mia Tehomaa",
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Kleen, M, Määttänen, M, Asikainen, S, Liitiä, T & Tehomaa, M 2011, Stepwise hot water and alkali extraction of birch sawdust to produce xylan and cellulose. in Proceedings: 16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC. vol. 1, pp. 666-671, 16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC, Tianjin, China, 8/06/11.

Stepwise hot water and alkali extraction of birch sawdust to produce xylan and cellulose. / Kleen, Marjatta; Määttänen, Marjo; Asikainen, Sari; Liitiä, Tiina; Tehomaa, Mia.

Proceedings: 16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC. Vol. 1 2011. p. 666-671.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - Stepwise hot water and alkali extraction of birch sawdust to produce xylan and cellulose

AU - Kleen, Marjatta

AU - Määttänen, Marjo

AU - Asikainen, Sari

AU - Liitiä, Tiina

AU - Tehomaa, Mia

PY - 2011

Y1 - 2011

N2 - In order to dissolve xylan with high yield, but also to preserve the average molar mass of the dissolved xylan as high as possible, stepwise pressurized hot water extraction (HWE) followed by alkali extraction was applied to industrial birch sawdust in a semi-pilot scale apparatus. This process revealed that the hot water extraction at 160°C for 2 h was the most effective step to dissolve xylan. The total extraction process dissolved 99% of the native xylan. HWE at 160°C for 30 min released material with the highest weight average molar mass (Mw 12-14 kDa), and consisting mainly of xylan. The extraction residue, containing mainly cellulose (76%) and lignin (21%), was delignified and bleached to remove the residual lignin and to produce hemicellulose-and lignin-free cellulose. After soda pulping and oxygen and chlorine dioxide bleaching, the pulp had kappa number 0.85 and ISO-brightness 79.8%. The cooking and bleaching process should be further optimized. (10 refs.)

AB - In order to dissolve xylan with high yield, but also to preserve the average molar mass of the dissolved xylan as high as possible, stepwise pressurized hot water extraction (HWE) followed by alkali extraction was applied to industrial birch sawdust in a semi-pilot scale apparatus. This process revealed that the hot water extraction at 160°C for 2 h was the most effective step to dissolve xylan. The total extraction process dissolved 99% of the native xylan. HWE at 160°C for 30 min released material with the highest weight average molar mass (Mw 12-14 kDa), and consisting mainly of xylan. The extraction residue, containing mainly cellulose (76%) and lignin (21%), was delignified and bleached to remove the residual lignin and to produce hemicellulose-and lignin-free cellulose. After soda pulping and oxygen and chlorine dioxide bleaching, the pulp had kappa number 0.85 and ISO-brightness 79.8%. The cooking and bleaching process should be further optimized. (10 refs.)

KW - alkali extraction

KW - betula verrucosa

KW - bleaching

KW - birch sawdust

KW - cellulose

KW - hot water extraction

KW - lignin

KW - molar mass

KW - pressurized extraction

KW - pulping

KW - xylan

M3 - Conference article in proceedings

SN - 978-7-5019-8206-6

VL - 1

SP - 666

EP - 671

BT - Proceedings

ER -

Kleen M, Määttänen M, Asikainen S, Liitiä T, Tehomaa M. Stepwise hot water and alkali extraction of birch sawdust to produce xylan and cellulose. In Proceedings: 16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC. Vol. 1. 2011. p. 666-671