Method of Depolymerisation of Hydrolytic Lignin for the Purpose of Obtaining Biofuel of New Generation
L. A. OPARINA1, O. V. VYSOTSKAYA1, A. V. ROKHIN2, L. V. KLYBA1, V. V. BELYAEVA1, V. I. SMIRNOV1, N. K. GUSAROVA1, B. A. TROFIMOV1
1Favorsky Institute of Chemistry, Siberian Branch of the Russian Academy, Ul. Favorskogo 1, Irkutsk 664033, Russia
2Irkutsk State University, Ul. Lermontova 126, Irkutsk 664033, Russia
Keywords: hydrolytic lignin, thermocatalytic hydrolysis and hydrogenolysis, supercritical alcohols, ligno-oil
Abstract
Hydrolytic lignin is transformed almost completely into liquid (lingo-oil) and gaseous products under the conditions of thermocatalytic hydrolysis and alcoholysis, in particular in combination with hydrogenolysis. The liquid fraction is a mixture of alkyl– and methoxyphenol, esters of carboxylic acids, aliphatic and aromatic hydrocarbons. These products are formed as a result of the destruction of lignin polymeric matrix mainly at С–О bonds. In addition, depolymerisation of lignin proceeds with substantial decrease in oxygen concentration in the formed liquid products (to 5–10 %) in comparison with that in initial lignin (30 %). Gaseous products contain carbon oxides and lower hydrocarbons (С1–С5).
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