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• W2017485029 abstract "Wheat straw lignin and hemicelluloses were degraded in a totally chlorine-free medium containing 80% acetic acid and 0.92–13.5% nitric acid. Effect of treatment time and temperature as well as nitric acid concentration on the efficiency of degradation of lignin and hemicellulosic polymers and on the yield of cellulose were comparatively investigated. The treatment with 80% acetic acid and 0.92% nitric acid as a catalyst at 120 °C for 20 min resulted in over 81% original hemicelluloses and 92% original lignin degradation. As the nitric acid concentration raises to 8.5%, over 96% original hemicelluloses and approximately 98% original lignin were degraded, yielding the cellulose approaching 96% purity. The characterisation of isolated cellulosic preparations was performed by their intrinsic viscosity, molecular weight, FT-IR, CP-MAS 13C-NMR, and thermal studies. The results showed that the treatment using 80% acetic acid and nitric acid as a catalyst under the conditions given also resulted in somewhat acetylation of the cellulose and decreased the degree of crystallinity of cellulose except for significant degradation of lignin and hemicellulosic polymers. The thermal stability of the cellulose declined with a decrease in its intrinsic viscosity" @default.
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• W2017485029 date "2004-01-01" @default.
• W2017485029 modified "2023-10-15" @default.
• W2017485029 title "Degradation of wheat straw lignin and hemicellulosic polymers by a totally chlorine-free method" @default.
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• W2017485029 doi "https://doi.org/10.1016/s0141-3910(03)00205-2" @default.
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