Hydrogen peroxide bleaching of cellulose pulps obtained from brewer’s spent grain |
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Authors: | Solange I Mussatto George J M Rocha Inês C Roberto |
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Institution: | 1.Departamento de Biotecnologia, Escola de Engenharia de Lorena,Universidade de S?o Paulo,Lorena,Brazil;2.Departamento de Engenharia Biológica,Universidade do Minho,Braga,Portugal |
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Abstract: | 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. |
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Keywords: | Bleaching Brewer’ s spent grain Cellulose Hydrogen peroxide Pulp |
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