| 摘要 |
The present invention concerns a method for purifying oses from hemicellulose originating from lignocellulosic biomass, said oses being contained in an acid hydrolysate obtained by partial hydrolysis of lignocellulosic biomass by means of at least one acid catalyst, said acid hydrolysate further comprising a cellulose matrix, solid residues and/or suspended matter, said method being characterised in that it comprises the following steps: - eliminating, from the acid hydrolysate, the cellulose matrix and the solid residues and/or the suspended materials, in order to obtain a clarified hydrolysate; - without adding any basic chemical reagent to increase the pH, subjecting said clarified hydrolysate to at least one step of ultrafiltration and/or to at least one step of nanofiltration, so as to obtain a filtrate containing the majority of the pentoses and a retentate containing the species likely to precipitate under the effect of an increase in the pH; - treating said filtrate by at least one step of electrodialysis so as to recover the acid catalyst from an acid-supplemented solution, and obtain a deacidified filtrate. |
