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01-03-2016 | Original Article | Issue 1/2016

Biomass Conversion and Biorefinery 1/2016

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

Journal:
Biomass Conversion and Biorefinery > Issue 1/2016
Authors:
Jiby Kudakasseril Kurian, Gopu Raveendran Nair, Yvan Gariepy, Valerie Orsat, Mark Lefsrud, Varoujan Yaylayan, G. S. Vijaya Raghavan

Abstract

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.

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