Application of mild autohydrolysis to facilitate the dissolution of wood chips in direct-dissolution solvents

摘要: Wood is not fully soluble in current non-derivatising direct-dissolution solvents, contrary to the many reports literature quoting wood ‘dissolution’ ionic liquids. Herein, we demonstrate that application of autohydrolysis, as a green and economical pre-treatment method, allows for massive increase solubility compared untreated wood. This demonstrated by two derivitising methods (phosphitylation acetylation), followed NMR analysis, cellulose-dissolving liquids 1-allyl-3-methylimidazolium chloride ([amim]Cl) 1,5-diazabicyclo[4.3.0]non-5-enium acetate ([DBNH][OAc]). In addition, non-derivitising tetrabutylphosphonium ([P4444][OAc]) : DMSO-d6 electrolyte also allowed dissolution autohydrolysed samples. By combination different particle sizes P-factors (autohydrolysis intensity), it has been clearly even chips can be drastically increased autohydrolysis. The physiochemical factors affecting after autohydrolysis are discussed.