Hydrogen peroxide bleaching of cellulose pulps obtained from brewer’s spent grain
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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.
KeywordsBleaching 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.
- Argyropoulos DS, Ahvazi BC, Pageau G, Liu Y (1999) Understanding lignin condensation reactions during pulping and oxygen delignification. In: Proceedings of the 6th Brazilian Symposium on the Chemistry of Lignins and Other Wood Components. Guaratinguetá, SP, Brazil, pp 159–166Google Scholar
- Browning BL (1967) Methods of wood chemistry. John Wiley & Sons, New York Google Scholar
- D'Almeida MLO (1988) Celulose e Papel—Tecnologia de fabricação de pasta celulósica, 2nd edn, vol 1, Senai/IPT, São Paulo, p 559Google Scholar
- Fardim P, Durán N (2005) Effects of kraft pulping on the interfacial properties of Eucalyptus pulp fibres. J Braz Chem Soc 16:915–921Google Scholar
- Fengel D, Wegener G (1989) Wood. Chemistry, ultrastructure, reactions. Walter de Gruyter, New York Google Scholar
- Gellerstedt G (2001) The pulping of wood. A chemical challenge. In: Proceedings of the 7th Brazilian Symposium on the Chemistry of Lignins and Other Wood Components. Belo Horizonte, MG, Brazil, pp 79–90Google Scholar
- Grace TM, Leopold B, Malcolm EW (1996) Chemical reactions of wood constituents. In: Kocurek MJ (ed) Pulp and paper manufacture: alkaline pulping, vol 5, pp 23–44. The Joint Textbook Committee of the Paper Industry/Tappi/CPPA, Atlanta, GAGoogle Scholar
- McMillan JD (1994) Pretreatment of lignocellulosic biomass. In: Himmel ME, Baker JO, Overend RP (eds) Conversion of hemicellulose hydrolyzates to ethanol. American Chemical Society Symposium, Washington, pp 292–324Google Scholar
- Tanaka R, Wan Rosli WD, Magara K, Ikeda T, Hosoya S (2004) Chlorine-free bleaching of kraft pulp from oil palm empty fruit bunches. JARQ – Jpn Agric Res Q 38:275–279Google Scholar
- Weinstock IA, Atalla RH, Reiner RS, Moen MA, Hammel KE, Houtman CJ, Hill CL (1996) A new environmentally benign technology and approach to bleaching kraft pulp. Polyoxometalates for selective delignification and waste mineralization. New J Chem 20:269–275Google Scholar
- Zou H, Genco JM, van Heiningen A, Cole B, Fort R (2002) Effect of hemicellulose content in kraft brownstock on oxygen delignification. In: Proceedings of the TAPPI Pulping & Engineering Conference. San Diego, CA, United StatesGoogle Scholar