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    Fruity flavors from waste: A novel process to upgrade crude glycerol to ethyl valerate

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    Type
    Article
    Authors
    Ganigué, Ramon
    Naert, Pieter
    Candry, Pieter
    de Smedt, Jonas
    Stevens, Christian V.
    Rabaey, Korneel
    KAUST Grant Number
    OSR-2016-CRG5-2985
    Date
    2019-05-28
    Online Publication Date
    2019-05-28
    Print Publication Date
    2019-10
    Embargo End Date
    2021-05-28
    Permanent link to this record
    http://hdl.handle.net/10754/656329
    
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    Abstract
    Valeric acid and its ester derivatives are chemical compounds with a high industrial interest. Here we report a new approach to produce them from crude glycerol, by combining propionic acid fermentation with chain elongation. Propionic acid was produced by Propionibacterium acidipropionici (8.49 ± 1.40 g·L−1). In the subsequent mixed population chain elongation, valeric acid was the dominant product (5.3 ± 0.69 g·L−1) of the chain elongation process. Residual glycerol negatively impacted the selectivity of mixed culture chain elongation towards valeric acid, whereas this was unaffected when Clostridium kluyveri was used as bio-catalyst. Valeric acid could be selectively isolated and upgraded to ethyl valerate by using dodecane as extractant and medium for esterification, whereas shorter-chain carboxylic acids could be recovered by using a 10 wt% solution of trioctylphosphine oxide (TOPO) in dodecane. Overall, our work shows that the combined fermentation, electrochemistry and homogeneous catalysis enables fine chemical production from side streams.
    Citation
    Ganigué, R., Naert, P., Candry, P., de Smedt, J., Stevens, C. V., & Rabaey, K. (2019). Fruity flavors from waste: A novel process to upgrade crude glycerol to ethyl valerate. Bioresource Technology, 289, 121574. doi:10.1016/j.biortech.2019.121574
    Sponsors
    R.G. gratefully acknowledges support from Ghent University Special Research Fund (BOF) (BOF15/PDO/068). P.N. is supported by the Research Foundation Flanders (FWO-SB-151223). P.C. is supported by the Ghent University Special Research Fund (BOF) (BOF15/DOC/286). K.R. is supported by Catalisti and VLAIO-ICON “CAPRA: upgrading steel mill off gas to caproic acid and derivatives using anaerobic technology” (VLAIO HBC.2016.0413) as well as a Competitive Research Grant from King Abdullah University of Science and Technology (KAUST), Project Reference OSR-2016-CRG5-2985. Authors thank Proviron for providing the crude glycerol used in the study.
    Publisher
    Elsevier BV
    Journal
    Bioresource Technology
    DOI
    10.1016/j.biortech.2019.121574
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0960852419308041
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.biortech.2019.121574
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