WFRF:(Virtanen Pekka)
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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 03189naa a2200385 4500 | |
| 001 | oai:DiVA.org:umu-48341 | |
| 003 | SwePub | |
| 008 | 111018s2012 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-483412 URI |
| 024 | 7 | a https://doi.org/10.1016/j.carbpol.2011.10.0062 DOI |
| 040 | a (SwePub)umu | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a ref2 swepub-contenttype |
| 072 | 7 | a art2 swepub-publicationtype |
| 100 | 1 | a Anugwom, I4 aut |
| 245 | 1 0 | a Selective Extraction of Hemicelluloses from Spruce using Switchable Ionic Liquids |
| 264 | 1 | b Elsevier,c 2012 |
| 338 | a print2 rdacarrier | |
| 520 | a Switchable Ionic Liquids (SILs) made from alcohols, either hexanol or butanol, and CO2 together with an amidine (1,8-diazabicyclo-[5.4.0]-undec-7-ene (DBU)) were investigated as dissolution/fractionation solvents for wood material. Both native spruce (Picea abies), and pre-extracted spruce were treated with either butanol SIL (SIL1) or hexanol SIL (SIL 2) for 5 days at 55 °C under normal pressure. The SILs were formed by bubbling CO2 through an equimolar mixture of either 1-hexanol or 1-butanol and DBU. The viscosity of the mixture increased from 7.1 mPas to 2980 mPas for SIL 2 and 5.1 to 1600 mPas for SIL 1. Melting points of the SILs 1 and 2 were at 8 and 14 °C, respectively. After the treatment time (5 days), the undissolved fraction contained 38 wt % less hemicelluloses compared to native spruce. There was an increase in the glucose content of the milled spruce treated with both SILs, since the milling step reduced the cellulose crystallinity of the wood and facilitated an easier SIL access into the wood. The solvents were very neutral in terms of lignin removal. Consequently, only about 2% of the lignin was removed from native wood. Moreover, a priori removal of the wood extractives did not influence the lignin removal. Highlights► Switchable Ionic Liquids made from, either hexanol or butanol, and CO2 together with an amidine (DBU) were studies as dissolution/fractionation solvents for spruce wood. ► After the treatment undissolved fraction contained 38 wt-% less hemicelluloses. ► We conclude that Switchable ionic liquids are effective solvent for fractionation of wood material, and they are easily recycled and can be reused. | |
| 650 | 7 | a NATURVETENSKAPx Kemi0 (SwePub)1042 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Chemical Sciences0 (SwePub)1042 hsv//eng |
| 653 | a Wood fractionation | |
| 653 | a treatment temperature | |
| 653 | a hemicelluloses | |
| 653 | a Switchable Ionic liquids | |
| 700 | 1 | a Mäki-Arvela, P4 aut |
| 700 | 1 | a Virtanen, P4 aut |
| 700 | 1 | a Willför, S4 aut |
| 700 | 1 | a Sjöholm, R4 aut |
| 700 | 1 | a Mikkola, Jyri-Pekkau Umeå universitet,Kemiska institutionen,Technical Chemistry, Chemical-Biological Center4 aut0 (Swepub:umu)jymi0001 |
| 710 | 2 | a Umeå universitetb Kemiska institutionen4 org |
| 773 | 0 | t Carbohydrate Polymersd : Elsevierg 87:3, s. 2005-2011q 87:3<2005-2011x 0144-8617x 1879-1344 |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-48341 |
| 856 | 4 8 | u https://doi.org/10.1016/j.carbpol.2011.10.006 |
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