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Biorefinery options to valorize the spent liquor from sulfite pulping

Abstract: BACKGROUND: Spent sulfite liquor is a by-product obtained in the process of manufacturing dissolving pulp by the acid sulfite method. A full physico-chemical characterization of this waste has been developed in order to determine if it is susceptible to valorization by means of biorefinery processes. RESULTS: The main components present in this spent liquor are sugars from hemicelluloses (25.9%), mainly xylose (18.2%) because hardwood is used as a raw material, and lignosulfonates (50.6%). Taking into account the results obtained, a literature search has been done in order to establish the biorefinery options for this lignocellulosic waste, giving lignosulfonates, xylitol, ethanol, polyhydroxybutyrateorpolybutylene-succinate,hydrogenandfurfural as thebest options.However, other compounds present in the liquor such as furans, acids and inorganic pollutants can complicate the valorization options. CONCLUSIONS: Spent sulfite liquor can be a good feedstock for biomass based processes. This paper will be useful for future work regarding the potential biorefinery opportunities of the sulfitemill.

 Autoría: Rueda C., Calvo P., Moncalián G., Ruiz G., Coz A.,

 Fuente: Journal of Chemical Technology and Biotechnology, 2015, Vol. 90(12), 2218-2226

 Editorial: Wiley-Blackwell

 Fecha de publicación: 01/12/2015

 Nº de páginas: 9

 Tipo de publicación: Artículo de Revista

 DOI: 10.1002/jctb.4536

 ISSN: 0268-2575,1097-4660

 Proyecto europeo: info:eu-repo/grantAgreement/EC/FP7/311935/EU/New tailor-made biopolymers produced from ignocellulosic sugars waste for highly demanding fire-resistant/BRIGIT/

 Url de la publicación: https://doi.org/10.1002/jctb.4536