Experimental investigation of a sequential process for the fractionation of sweet sorghum bagasse

Jiby Kudakasseril Kurian, Gopu Raveendran Nair, Yvan Gariepy, Valerie Orsat, Mark Lefsrud, Varoujan Yaylayan, G. S.Vijaya Raghavan

Research output: Contribution to journalArticlepeer-review


Sweet sorghum bagasse (SSB) was fractionated into hemicellulosic sugars and cellulose-rich residue in a two-step process using water and calcium hydroxide. The optimum conditions for autohydrolysis of SSB using water at 121 °C were 13 %(g/g) substrate and 90 min isothermal treatment time that could extract 72.69 ± 0.08 % (g/g) of the hemicellulose from the substrate. The calcium hydroxide treatment of the autohydrolysed SSB under optimum conditions at 121 °C, 10 % (g/g mixture) substrate loading, Ca(OH)2 at 10 % (g/g of substrate) and 106 min isothermal treatment could extract 69.67 ± 1.26 % (g/g) of the lignin from the substrate into a yellow liquor. The lignin was isolated from the yellow liquor by using CO2 at room temperature. Adding CO2 at a flow rate of 17 mL/min precipitated 65.99 ± 1.2 % (g/g) of the calcium hydroxide as calcium carbonate and 58.85 ± 3.2 % (g/g) of the lignin in the yellow liquor at room temperature. The FTIR, DSC and SEM analyses confirmed the compositional and morphological changes in the treated SSB samples.

Original languageEnglish (US)
Pages (from-to)1-11
Number of pages11
JournalBiomass Conversion and Biorefinery
Issue number1
StatePublished - Mar 1 2016
Externally publishedYes


  • Autohydrolysis
  • CO treatment
  • Lignin recovery
  • Lime recovery
  • Lime treatment
  • Sweet sorghum bagasse

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment


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