Hydrothermal hydrolysis of grape seeds to produce bio-oil

In the present work, the hydrothermal hydrolysis of grape seeds focused on the production of bio-oil was studied. The grape seeds composition in terms of lignin, sugars, ash, extractives and bio-oil was determined. The composition of grape seeds was: 17.0 wt% of extractives; 36.8 wt% of sugars (hemi...

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Bibliographic Details
Published in:RSC advances 2014-01, Vol.4 (57), p.30332-30339
Main Authors: Yedro, Florencia M., García-Serna, Juan, Cantero, Danilo A., Sobrón, Francisco, Cocero, María J.
Format: Article
Language:English
Subjects:
Ashes
Grapes
Hydrolysis
Mass transfer
Reactors
Residues
Seeds
Sugars
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Summary:In the present work, the hydrothermal hydrolysis of grape seeds focused on the production of bio-oil was studied. The grape seeds composition in terms of lignin, sugars, ash, extractives and bio-oil was determined. The composition of grape seeds was: 17.0 wt% of extractives; 36.8 wt% of sugars (hemicellulose and cellulose); 43.8 wt% of lignin and 2.4 wt% of ash. The grape seeds were hydrothermally treated using three different temperatures: 250 degree C, 300 degree C and 340 degree C employing a semi-continuous reactor. The solid residue varied from 25.6-35.8 wt% depending on the hydrolysis temperature. The maximum yields of light (15.7 wt%) and heavy bio-oil (16.2 wt%) were achieved at 340 degree C. The Arrhenius parameters for the kinetics of grape seeds hydrolysis in our system were k sub(0) = 0.995 g min super(-1) and E sub(a) = 13.8 kJ mol super(-1). The increment of the flow rate favoured the mass transfer in the system and so, the hydrolysis rate. However, the maximum hydrolysis rate was found at a water surface velocity of 2.3 cm min super(-1).
ISSN:2046-2069
2046-2069
DOI:10.1039/C4RA00429A