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TitleCarboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions
Author(s)Ruzene, Denise S.
Gonçalves, A. R.
Teixeira, J. A.
Amorim, M. T. Pessoa de
KeywordsAcid and alkaline catalyzed ethanol pulping
Chemical bleaching
Infrared spectra
Sugarcane bagasse
Organosolv pulping
Issue dateApr-2007
PublisherHumana Press
JournalApplied Biochemistry and Biotechnology
Citation"Applied Biochemistry and Biotechnology". ISSN 0273-2289. 137-140:1-12 (Apr. 2007) 573-582.
Abstract(s)Sugar cane bagasse pulps were obtained by ethanol/water organosolv process under acid and alkaline conditions. The best condition of acid pulping for the sugarcane bagasse was 0.02 mol/L sulfuric acid at 160°C, for 1 h, whereas the best condition for alkaline pulping was 5% sodium hydroxide (base pulp) at 160°C, for 3 h. For the residual lignin removal, the acid and alkaline pulps were submitted to a chemical bleaching using sodium chlorite. Pulps under acid and alkaline conditions bleached with sodium chlorite presented viscosities of 3.6 and 7.8 mPa·s, respectively, and μ-kappa numbers of 1.1 and 2.4, respectively. The pulp under acid condition, bleached with sodium chlorite was used to obtain carboxymethylcellulose (CMC). CMC yield was 35% (pulp based), showing mass gain after the carboxymethylation reaction corresponding to 23.6% of substitution or 0.70 groups −CH2 COONa per unit of glucose residue. The infrared spectra showed the CMC characteristic bands and by the infrared technique it was possible to obtain a substitution degree (0.63), similar to the substitution degree calculated by mass gain (0.70).
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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