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Process options for the recovery of a pentosan-enriched fraction from wheat-based bioethanol thin stillage
Citation Link: https://doi.org/10.15480/882.8735
Publikationstyp
Journal Article
Date Issued
2023-12-01
Sprache
English
TORE-DOI
Volume
10
Issue
1
Start Page
1
End Page
13
Article Number
59
Citation
Bioresources and Bioprocessing 10 (1): 59 (2023)
Publisher DOI
Scopus ID
Publisher
Springer
Peer Reviewed
true
Aim: Stillage, the main residue from cereal-based bioethanol production, offers a great potential for the recovery of pentosan-type carbohydrates. Therefore, potential process options for the recovery of pentosans from bioethanol thin stillage are investigated and their basic feasibility is demonstrated on a laboratory scale. Findings: The main result of this work is the development of a three-stage process for pentosan recovery, including solid–liquid separation, pentosan solubilisation and purification. The pentosan content of the thin stillage used here was determined to be about 14% related to dry matter (DM). By means of solid–liquid separation, these pentosans accumulate in the liquid phase (up to 80%), while the remainder (about 20%) is found in the solid phase. Solubilisation of these insoluble pentosans was achieved by using either a hydrothermal, an alkaline or an enzymatic treatment. Here, the results indicate a maximum solubilisation yield of 90% with a hydrothermal treatment using liquid hot water at 180 °C. Ultrafiltration and precipitation are investigated for purification. The most promising process option in this study is solid–liquid separation followed by ultrafiltration. In this case, the total pentosan yield is assessed to be about 48% (based on thin stillage) with a final pentosan concentration of about 30%DM. Graphical Abstract: [Figure not available: see fulltext.]
Subjects
Distillers’ grains
Ethanol
Pentosan determination
Pentosan recovery
Pentosan solubilisation
Stillage
DDC Class
333.7: Natural Resources, Energy and Environment
570: Life Sciences, Biology
660: Chemistry; Chemical Engineering
Publication version
publishedVersion
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