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Hydrothermal fractionation of grape seeds in subcritical water to produce oil extract, sugars and lignin

Paper ID Volume ID Publish Year Pages File Format Full-Text
53462 46971 2015 9 PDF Available
Title
Hydrothermal fractionation of grape seeds in subcritical water to produce oil extract, sugars and lignin
Abstract

•Grape seeds as a model compound for hydrothermal treatment and extraction.•Multi-step temperature hydrolysis from 150 to 340 °C feasible for biomass fractionation.•High lignin purity in the residual solid >90%.•Extraction of 50–62% of sugars (0.20–0.23 g/g-grape).

In this work, the fractionation of grape seeds as a model biomass was studied using a combination of two processes: solvothermal extraction and hydrothermal fractionation-hydrolysis process in a semicontinuous reactor. First, grape seeds were subjected to an extraction process with ethanol/water (70/30 wt.%) at 90 °C during 60 min obtaining ca. 13.0 wt.% of oil and extractable components with 4.46 wt.% of polyphenols (66% of the maximum). Afterwards, the solvent was water and the biomass was treated in steps at different temperatures (150 °C to 340 °C). During the hydrolysis the pH decreased from 5.5 down to 3.0 due to acetyl group liberation. The total quantity of recovered sugars varied around 20.0 to 23.1 wt.%. The best experimental condition for obtaining the maximum amount of pentoses + hexoses + oligosaccharides was 180 °C (45 min) + 250 to 265 °C (45 min) + 330 to 340 °C (45 min).

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Keywords
Biomass; Biorefinery; Hydrothermal; Pretreatment; Carbonization; Grape seeds
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Hydrothermal fractionation of grape seeds in subcritical water to produce oil extract, sugars and lignin
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 257, Part 2, 15 November 2015, Pages 160–168
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us