Understanding the role of water in the interaction of ionic liquids with wood polymers
| Autor: | Michael Hummel, Jari Vartiainen, Herbert Sixta, Kaarlo Nieminen, Annariikka Roselli |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Polymers and Plastics
Ionic bonding 02 engineering and technology Ionic liquid engineering.material 010402 general chemistry Mole fraction 01 natural sciences Xylan chemistry.chemical_compound Materials Chemistry Organic chemistry Hemicellulose Fractionation Cellulose ta216 Dissolution Molar mass Pulp (paper) Organic Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Chemical engineering engineering 0210 nano-technology Dissolving pulp |
| Zdroj: | Carbohydrate Polymers. 168:121-128 |
| ISSN: | 0144-8617 |
| DOI: | 10.1016/j.carbpol.2017.03.013 |
| Popis: | Hemicellulose lean pulps are a raw material source for numerous high value products. We have previously presented the IONCELL-P(ulp) process, a hemicellulose extraction method, based on a binary mixture of ionic liquid and water. The IONCELL-P process does not suffer from yield losses or polymer degradation and retains the Cellulose I crystalline form. In this paper, a selection of cellulose dissolving ionic liquids is tested, in order to compare their applicability in the process. We demonstrate that the extraction selectivity towards low molar mass polymers is related to the anion's ability to accept hydrogen bonds (Kamlet-Taft β-value), if divided by the water molar fraction of the solvent system. Pulp consistency, solvent system viscosity and pH are investigated in order to identify the factors affecting the extraction efficiency. The results show that all the tested ionic liquid-water mixtures were able to dissolve hemicelluloses, but there were differences in their efficiency, selectivity and the ability to process high pulp consistencies. |
| Databáze: | OpenAIRE |
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