High-pressure delignification of Eucalyptus Wood by 1,4-Dioxane-CO2 Mixtures

Extraction of lignin from sugar cane bagasse and Pinus taeda wood chips using ethanol–water mixtures and carbon dioxide at high pressures

“…The extent of delignification achieved in only 30 min reaction time for pulping of P. taeda is in the same order of magnitude reported in the literature for different solvent mixtures and wood species treated with longer reaction times [4,8,9,10].…”

“…Machado et al studied the reactive extraction of lignin from Eucalyptus globules sawdust with pure dioxane and dioxane-carbon dioxide mixtures at 170 bar and temperatures in the range of 160-180 • C and 300 min as reaction time [9,10]. In the experiments performed with pure dioxane the increase in the temperature produced small increase in the amount of hemicelluloses and lignin removal.…”

Sugar cane bagasse pulping using supercritical CO2 associated with co-solvent 1-butanol/water

“…However, the use of this technique for lignin extraction and cellulosic pulp production has been reported only in few published works [4][5][6][7][8][9][10]. These studies were performed employing organic solvents (acetic acid, ethanol, methanol, dioxane, etc.)…”

Cork: properties, capabilities and applications

“…85 The main advantages claimed 80 are: the higher purity of extracted compounds and the use of a thermally non-aggressive and non-toxic technology, thereby avoiding degradation of these components. 83,86 Supercritical fluids may also be used to extract lignin, 81,87 if a correct co-solvent is used, and to transport and introduce desirable components such as preservatives. 88,89 Phenolic compounds Phenolic compounds are solvent extractable components of low molecular weight.…”