Applied Biochemistry and Biotechnology

, Volume 137, Issue 1, pp 573–582

Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions

  • Denise S. Ruzene
  • Adilson R. Gonçalves
  • José A. Teixeira
  • Maria T. Pessoa de Amorim
Session 3

DOI: 10.1007/s12010-007-9080-0

Cite this article as:
Ruzene, D.S., Gonçalves, A.R., Teixeira, J.A. et al. Appl Biochem Biotechnol (2007) 137: 573. doi:10.1007/s12010-007-9080-0

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).

Index Entries

Acid and alkaline catalyzed ethanol pulping carboxymethylcellulose chemical bleaching infrared spectra sugarcane bagasse Organosolv pulping 

Copyright information

© Humana Press Inc 2007

Authors and Affiliations

  • Denise S. Ruzene
    • 1
  • Adilson R. Gonçalves
    • 1
  • José A. Teixeira
    • 2
  • Maria T. Pessoa de Amorim
    • 3
  1. 1.Departamento de BiotecnologiaEscola de Engenharia de Lorena-USPLorena SPBrazil
  2. 2.Centre for Biological EngineeringUniversidade do Minho, Campus de GualtarBragaPortugal
  3. 3.Centro de Engenharia TêxtilUniversidade do MinhoCampus de AzurémPortugal

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