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Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions

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Abstract

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).

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Authors and Affiliations

  1. Departamento de Biotecnologia, Escola de Engenharia de Lorena-USP, CxPostal 116, CEP 12.600-970, Lorena SP, Brazil

    Denise S. Ruzene & Adilson R. Gonçalves

  2. Centre for Biological Engineering, Universidade do Minho, Campus de Gualtar, 4710-057, Braga, Portugal

    José A. Teixeira

  3. Centro de Engenharia Têxtil, Universidade do Minho, Campus de Azurém, Portugal

    Maria T. Pessoa de Amorim

Authors
  1. Denise S. Ruzene
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  2. Adilson R. Gonçalves
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  3. José A. Teixeira
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  4. Maria T. Pessoa de Amorim
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Corresponding author

Correspondence to Adilson R. Gonçalves.

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Ruzene, D.S., Gonçalves, A.R., Teixeira, J.A. et al. Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions. Appl Biochem Biotechnol 137, 573–582 (2007). https://doi.org/10.1007/s12010-007-9080-0

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  • DOI: https://doi.org/10.1007/s12010-007-9080-0

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