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Abe M.,Tokyo University of Agriculture and Technology | Abe M.,Functional Ionic Liquids Laboratories | Yamanaka S.,Tokyo University of Agriculture and Technology | Yamanaka S.,Functional Ionic Liquids Laboratories | And 4 more authors.
Green Chemistry | Year: 2015

Dissolution of several kinds of woods was examined in tetra-n-butylphosphonium hydroxide ([P4,4,4,4]OH) aqueous solution. Since there is a strong correlation between the dissolution degrees and the Klason lignin contents of the wood, lignin degradation and removal were found to be necessary for efficient dissolution of several woods such as cedar. It was found that moderate heating (60°C) and addition of H2O2 aqueous solution to 50% [P4,4,4,4]OH aqueous solution are quite effective to dissolve wood. Cedar powder (final concentration of 5.0 wt%) was almost completely dissolved in this aqueous solution at 60°C under mild stirring for 24 h. This efficient wood dissolution was caused by partial degradation of lignin. This journal is © The Royal Society of Chemistry.

Abe M.,Tokyo University of Agriculture and Technology | Abe M.,Functional Ionic Liquids Laboratories | Abe M.,Kyoto University | Kuroda K.,Tokyo University of Agriculture and Technology | And 8 more authors.
Physical Chemistry Chemical Physics | Year: 2015

We have synthesised novel ionic liquids (ILs) to show both cellulose dissolution ability and LCST-type phase transition after mixing with water. To realise both polar and hydrophobic properties, tetraalkylphosphonium cations and a series of carboxylate anions were employed to assume hydrophobic and highly polar properties, respectively. Effects of their alkyl chain length on the water compatibility and cellulose solubility of the corresponding ILs were systematically examined. We succeeded in synthesising novel ILs which dissolve cellulose and separable with water at moderate temperature. Through the present study, we have clarified that not only polarity but also density of ILs is an important factor in designing the ILs for cellulose dissolution. © the Owner Societies.

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