, Volume 15, Issue 4, pp 641–649 | Cite as

Hydrogen peroxide bleaching of cellulose pulps obtained from brewer’s spent grain

  • Solange I. Mussatto
  • George J. M. Rocha
  • Inês C. Roberto


Brewer’s spent grain (BSG) was evaluated for bleached pulp production. Two cellulose pulps with different chemical compositions were produced by soda pulping: one from the original raw material and the other from material pretreated by dilute acid. Both of them were bleached by a totally chlorine-free sequence performed in three stages, using 5% hydrogen peroxide in the two initial, and a 0.25 N NaOH solution in the last one. Chemical composition, kappa number, viscosity, brightness and yield of bleached and unbleached pulps were evaluated. The high hemicellulose (28.4% w/w) and extractives (5.8% w/w) contents in original BSG affected the pulping and bleaching processes. However, soda pulping of acid pretreated BSG gave a cellulose-rich pulp (90.4% w/w) with low hemicellulose and extractives contents (7.9% w/w and <3.4% w/w, respectively), which was easily bleached achieving a kappa number of 11.21, viscosity of 3.12 cp, brightness of 71.3%, cellulose content of 95.7% w/w, and residual lignin of 3.4% w/w. Alkaline and oxidative delignification of acid pretreated BSG was found as an attractive approach for producing high-purity, chlorine-free cellulose pulp.


Bleaching Brewer’s spent grain Cellulose Hydrogen peroxide Pulp 



This work was supported by Capes (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior), CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) and FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo), Brazil.


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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Solange I. Mussatto
    • 1
    • 2
  • George J. M. Rocha
    • 1
  • Inês C. Roberto
    • 1
  1. 1.Departamento de Biotecnologia, Escola de Engenharia de LorenaUniversidade de São PauloLorenaBrazil
  2. 2.Departamento de Engenharia BiológicaUniversidade do MinhoBragaPortugal

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