Chemical Composition of Russian Miscanthus and the Quality of Cellulose Obtained Therefrom
YU. A. GISMATULINA and V. V. BUDAEVA
Institute for Problems of Chemical and Energetic Technologies, Siberian Branch of the Russian Academy of Sciences,
Ul. Sotsialisticheskaya 1, Biysk 659322 (Russia)
E-mail: ipcet@mail.ru
Keywords: Russian miscanthus, ash, fat-wax fraction, cellulose according to Kurschner, nitric acid method, О±-cellulose, residual lignin, level of polymerization
Pages: 503–508
Abstract
Chemical compositions were determined for two miscanthus crops harvested from one-year-old and two-year-old plantations (the whole plant, stems and leaves taken separately). The content of non-cellulosic components (fat-and-wax fraction, ash, acid-insoluble lignin) in the leaves was revealed to be higher as compared with the corresponding parameters for the stems, whereas cellulose and pentosans in the stem are prevailing. It has been demonstrated that the cellulose species obtained with the help of a nitric-acid method from the leaves and stems, taken separately, are varying in quality and yield. The ash level and the residual lignin content inherent in the cellulose obtained from leaves is higher than that for the cellulose obtained from the stems, whereas the mass fraction of α-cellulose and the polymerization level of cellulose obtained from the leaves are lower as compared to those for the cellulose produced from the stems. It was found that the cellulose from the miscanthus stems taken from two-year-old plantations, is characterized by a high quality: the mass fraction of α-cellulose is equal to 94 %, PL 800, ash content 0.07 %, the mass fraction of residual lignin 0.5 %, that of pentosans amounting to 0.4 %.
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