Fractionation of sulphite spent liquor for biochemical processing using ion exchange resins
authors Fernandes, DLA; Silva, CM; Xavier, AMRB; Evtuguin, DV
nationality International
journal JOURNAL OF BIOTECHNOLOGY
author keywords Sulphite spent liquor; Lignosulphonates; Sugars; Fermentation; Ion exchange resin; Bioethanol
keywords EUCALYPTUS-GLOBULUS; ETHANOL-PRODUCTION; PICHIA-STIPITIS; BIOETHANOL; LIGNOCELLULOSE; BIOREFINERIES; PRODUCTS; HARDWOOD; XYLOSE
abstract Sulphite spent liquor (SSL) is a side product from acidic sulphite pulping of wood, which organic counterpart is composed mainly by lignosulphonates (LS) and sugars. The last are a prominent substrate for the bioprocessing although a previous purification step is necessary to eliminate microbial inhibitors. In this study a fractionation of hardwood SSL (HSSL) has been accomplished employing ion exchange resins in order to separate sugars fraction from concomitant inhibitors: LS, acetic acid, furan derivatives, phenolics, acetic acid and excess of inorganic salts. The fractionation of HSSL has been carried out using two fixed-bed ion exchangers in series (cationic + anionic). The first cation exchange column packed with Dowex 50WX2 resin was able to eliminate free cations and partially separate sugars from high molecular weight LS and furan derivatives. The second anion exchange column packed with Amberlite IRA-96 sorbed remaining LS, phenolics and acetic acid. Overall, the series arrangement under investigation has removed 99.99% of Mg2+, 99.0% of Ca2+, 99.6% of LS, and 100% of acetic acid, whereas the yield of recovered sugars was at least 72% of their total amount in HSSL. (C) 2012 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0168-1656
year published 2012
volume 162
issue 4
beginning page 415
ending page 421
digital object identifier (doi) 10.1016/j.jbiotec.2012.03.013
web of science category Biotechnology & Applied Microbiology
subject category Biotechnology & Applied Microbiology
unique article identifier WOS:000311964900009
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