an official journal of: published by:
Editor in Chief: RAFFAELLO COSSU


  • Jelian Grace L. Gontiñas - Department of Chemical Engineering, University of San Carlos, Philippines
  • Luis K. Cabatingan - Department of Chemical Engineering, University of San Carlos, Philippines
  • Yi-Hsu Ju - Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taiwan
  • Alchris W. Go - Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taiwan - Department of Chemical Engineering, University of San Carlos, Philippines - Visiting Foreign Researcher, National Taiwan University of Science and Technology, Taiwan - Visiting Foreign Researcher, National Taiwan University of Science and Technology, Taiwan
  • Mary Alfil A. Curayag - Department of Chemical Engineering, University of San Carlos, Philippines
  • Jenearly Z. Baloro - Department of Chemical Engineering, University of San Carlos, Philippines

DOI 10.31025/2611-4135/2019.13823

Released under CC BY-NC-ND

Copyright: © 2019 CISA Publisher

Editorial History

  • Received: 14 Jan 2019
  • Accepted: 17 Jun 2019
  • Available online: 28 Jun 2019


Wastes generated from carrageenan processing industry include cellulosic filter cakes (CFC) which are mainly composed of structural sugar (0.25 w/w) and ash (0.75 w/w, primarily perlite). This study investigated the possible valorization of CFC by recovering the available sugars as glucose through direct acid hydrolysis. Five different sulfuric acid concentrations (5% v/v to 15% v/v) were used as catalyst for hydrolysis done at constant temperature and solvent-to-solid ratio of 95°C and 8 mL/g, respectively, over a reaction time of 5 to 300 minutes, to determine the effect of acid concentration on the hydrolysis yield. The maximum sugar yield achieved was only ~0.06 w/w, corresponding to a recovery of ~24%, for hydrolysis done with 10% v/v sulfuric acid for 120 minutes. Although the amount of sugar recovered was relatively low, hydrolysates obtained have a sugar concentration of ~7 g/L, a level considered adequate for substrates in some fermentation processes. In addition, none of the inhibitory compound, 5-hydroxymethylfurfural, was present in the hydrolysate. Drying of residual solids obtained after hydrolysis was found to result in the sulfonation of the remaining organic fraction, producing a sulfonated residue (with total acid density of 4 to 7 mmol H+/g) which may be used as solid acid catalyst. 



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