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 pulpingcarboxymethylcellulosechemical bleachinginfrared spectrasugarcane bagasseOrganosolv 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