title: Evaluation of ultra- and nanofiltration for refining soluble products from rice husk xylan.
abstract: Liquors from water treatments of rice husks (containing soluble xylan-derived products) were processed with NF and UF membranes for concentrating and removing both monosaccharides and non-saccharide compounds. Among the commercial membranes assayed, the best results were achieved with the 4 kDa polymeric tubular ESP04 (PCI Membranes), and the 1 kDa ceramic monolithic Kerasep Nano (Novasep). Several trade-offs were identified both in membrane selection and in operating conditions. The ESP04 polymeric membrane provided the best fractionation, but lower recovery under comparable experimental conditions, while its fluxes were about half of those of the ceramic Kerasep Nano membrane. Increase in transmembrane pressure resulted in improved product recovery, at the expense of a lower purity. Additional data on product refining by coupling membrane processing with extraction and ion exchange are provided.
authors.affiliation: Department of Chemical Engineering, University of Vigo (Campus Ourense), Polytechnical Building, As Lagoas, 32004 Ourense, Spain.
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Vegas
authors.forename: Andrés
authors.initials: A
authors.lastname: Moure
authors.forename: Herminia
authors.initials: H
authors.lastname: Domínguez
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Parajó
authors.forename: José Ramón
authors.initials: JR
authors.lastname: Alvarez
authors.forename: Susana
authors.initials: S
authors.lastname: Luque
mesh_terms: D006868:Hydrolysis; D008567:Membranes, Artificial; D009844:Oligosaccharides / Q000302:isolation & purification; D012275:Oryza; D012639:Seeds / Q000737:chemistry*; D012995:Solubility; D014462:Ultrafiltration / Q000379:methods*; D014990:Xylans / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D008567:Membranes, Artificial; D009844:Oligosaccharides; D014990:Xylans