Pine wood fractionation in SC ethanol : Impact of heterogeneous acid/base-copper catalysts on wood components conversion and chemicals fields.

SSCI-VIDE+CDFA+MET:FRA:NESNational audienceThe gradual decrease in fossil fuel has urged a shift to biomass valorization as an alternative to secure the energy and chemical supplies. Besides, the emerging concept of “zero waste economy” encourages utilization of lignocellulosic biomass as raw materials in productions and applications.At the end of the seventies, the application of sub-and supercritical fluids, mainly SC water and SC alcohols, in the treatment of lignocellulosic biomass appeared in the literature. Supercritical fluids offer a lot of possibilities from extractions of “extractives”, total lignocellulosic biomass liquefaction up to the selective wood component liquefaction into chemicals. The direct conversion of wood into chemicals relies most likely in the control of the selectivity at two levels: 1) The selective liquefaction of one wood component keeping the others un-attacked as much as possible 2) The selection of efficient heterogeneous catalysts to assist the wood component liquefaction at the earliest stage, promoting chemicals formation and preventing liquid and solid polymers formations. These are the objectives of this work: the first step deals with the control of wood fractionation conditions in SC ethanol to liquefy preferentially one wood component if possible. Then, in a second step, wood liquefaction is performed in combination with heterogeneous catalysts (acid-base and copper catalysts) to drive the transformation into the selective formation of added value chemicals