Fruity flavors from waste: A novel process to upgrade crude glycerol to ethyl valerate
Type
ArticleAuthors
Ganigué, RamonNaert, Pieter
Candry, Pieter
de Smedt, Jonas
Stevens, Christian V.
Rabaey, Korneel
KAUST Grant Number
OSR-2016-CRG5-2985Date
2019-05-28Online Publication Date
2019-05-28Print Publication Date
2019-10Embargo End Date
2021-05-28Permanent link to this record
http://hdl.handle.net/10754/656329
Metadata
Show full item recordAbstract
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.2019.121574Sponsors
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 BVJournal
Bioresource TechnologyAdditional Links
https://linkinghub.elsevier.com/retrieve/pii/S0960852419308041ae974a485f413a2113503eed53cd6c53
10.1016/j.biortech.2019.121574