Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia

KN-3CONVERSIONS OF WOOD AND CELLULOSE TO GLUCOSE ANDLEVULINIC ACID UNDER THE ACTION OF ACIDIC CATALYSTSKuznetsov B.N. 1,2 , Sharypov V.I. 1 , Baryshnikov S.V. 11 Institute of Chemistry and Chemical Technology SB RAS,K. Marx str., 42, Krasnoyarsk, 660049, fax: +7(391)2439342, e-mail: inm@icct.ru2 Siberian Federal University, Svobodny pr., 79, Krasnoyarsk, 660041The actual problem in chemical processing of renewable biomass is connectedwith the development of improved methods of acid-catalyzed conversions oflignocellulosic materials into valuable chemicals.The influence of conditions of preliminary activation of wood and parameters ofacidic hydrolysis process on the yield, composition and structure of obtainedproducts was studied.It was found that the mechanical treatments of wood in water medium increasethe rate and degree of wood acidic hydrolysis to monosugars. Methods of woodactivation (cuttery, jet, vibratory rod mills and mechanochemical activator) define thetime of treatment, needed for maximal hydrolysis rate. The mechanochemicaltreatment of wood in a centrifugal-planetary activator mill AGO-2 gives the highesteffect. The used method of wood treatment results in changes of wood structure.Wood fibers fibrillation influences on the rate of hydrolysis in the higher degree thanthat of fibers length reduction.The efficiency of next methods of wood treatment, which reduce the content ofhemicelluloses in wood was compared: shot-time treatment by steam at 220-240 °C,catalytic oxidation by H 2 O 2 at 120-130 °C and prehydrolysis with 2 % HCl at 100 °C.The following complete hydrolysis of treated wood by H 2 SO 4 makes it possible toproduce glucose syrups without impurities of C 5 -sugars, which inhibit thebiotechnological synthesis of ethanol.The influence of nature of acidic catalysts (H 2 SO 4 , Al 2 (SO 4 ) 3 , Fe 2 (SO 4 ) 3 ), woodraw material (aspen, birch, abies, cellulose) and steam thermolysis processconditions on the yield of levulinic acid (LA) was studied. The maximal yield of LAwas observed at 200-240 °C with catalysts H 2 SO 4 and Al 2 (SO 4 ) 3 . Wood nature hasthe low influence on LA yield (reaches to 15-16 % mas.). Acidic conversion ofcellulose with H 2 SO 4 catalyst gives LA yield up to 25 % mas. Possible areas oflevulinic acid application are synthesis of new polymers, high-octane additives andother valuable chemicals.17