A one-stage process for the high temperature rapid dilute acid hydrolysis of hardwoods, to produce simultaneously furfural and fermentable sugars, is described. A continuous plug flow reactor unit designed to hydrolyse medium consistency wood suspensions (up to 13% w/w in solids) has been operated at capacities up to 90 kg/h, with temperatures ranging from 190°C to 240°C and 20-120 s as residence times. The final products, mainly furfural and sugars, have been analyzed using high performance liquid chromatography. Yields of 15 kg of hexoses (30% of the theoretical potential) and 10 kg of furfural (65% of the theoretical potential) for 100 kg of sawdust (dry basis) have been obtained. Two pseudokinetic models were used to simulate the pentosan and hexosan acid hydrolysis reactions. A Flowtran simulation has been conducted resulting in mass and energy balances for an eventual industrial unit. . ~ ~~ -On decrit un processus monoCtage pour I'hydrolyse rapide a I'acide dilue B haute tempkrature de bois feuillus, pour produire simultanement du furfural et des sucres fermentescibles. On a fait fonctionner un rCacteur en continu a ecoulement piston conqu pour I'hydrolyse de suspensions de bois de consistance moyenne (jusqu'a 13% en poids des solides) a des capacites allant jusqu'h 90 kg/h, avec des temperatures comprises entre 190 et 240°C et des temps de sCjour de 20 a 120 s. Les produits finaux, principalement du furfural et des sucres, ont CtC analyses par chromatographie liquide 2 haute performance. On a obtenu des rendements de 15 kg d'hexoses (30% du potentiel theorique) et de 10 kg de furfural (65% du potentiel thCorique) pour 100 kg de sciure de bois (base skche). On a utilisC deux modeles pseudo-cinttiques afin de simuler les reactions d'hydrolyse acide des pentosanes et des hexosanes. Une simulation par Flowtran a Ct C effectuee donnant des bilans massiques et d'energie pour une unite industrielle Cventuelle.
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