Solubility of Organosolv Lignin in [gamma]-Valerolactone/Water Binary Mixtures

Solubility of Organosolv Lignin in [gamma]-Valerolactone/Water Binary Mixtures

The solubility of lignin in a mixture of [gamma]-valerolactone (GVL) and water at different weight ratios was measured using the Hildebrand solubility parameters. Based on the molecular structure of lignin, its solubility parameter ([delta]-value) was calculated as 25.5MPa1/2. The [delta]-value for...

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Veröffentlicht in:ChemSusChem 2016-10, Vol.9 (20), p.2939
Hauptverfasser: Le, Huy Quang, Zaitseva, Anna, Pokki, Juha-Pekka, Stahl, Marina, Alopaeus, Ville, Sixta, Herbert
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Lignin
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container_issue 20
container_start_page 2939
container_title ChemSusChem
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creator Le, Huy Quang
Zaitseva, Anna
Pokki, Juha-Pekka
Stahl, Marina
Alopaeus, Ville
Sixta, Herbert
description The solubility of lignin in a mixture of [gamma]-valerolactone (GVL) and water at different weight ratios was measured using the Hildebrand solubility parameters. Based on the molecular structure of lignin, its solubility parameter ([delta]-value) was calculated as 25.5MPa1/2. The [delta]-value for aqueous GVL solvent increased from 23.1MPa1/2 for pure GVL to 45.6MPa1/2 for pure water. Therefore, the lignin solubility was predicted to increase with increasing GVL concentration in the aqueous mixture up to approximately 92-96wt% of GVL. A ternary diagram describing the phase behavior of water-GVL-lignin mixtures at room temperature was constructed based on the experimental results. The three-component system exhibited a complex behavior with a liquid-liquid and solid-liquid-liquid phase split. The efficiency of the selected fractionation trials in a previous work was validated using the ternary solubility diagram. A promising recovery pathway and lignin isolation method were deduced from the results of this work.
doi_str_mv 10.1002/cssc.201600655
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title Solubility of Organosolv Lignin in [gamma]-Valerolactone/Water Binary Mixtures
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