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In-situ extraction of depolymerization products by membrane filtration against lignin condensation

Abstract : Catalytic depolymerization of lignin is a challenging process due to competitive repolymerization reactions. In this paper, the oxidative depolymerization of lignin was catalyzed by a commercial laccase both in a batch experiment and in a membrane bioreactor using the same catalytic conditions. The membrane bioreactor was previously optimized to reach high permeation flux (25 L.h−1.m−2) during lignin diafiltration. While the lignin was exclusively condensed in the batch experiment leading to high molecular weight macromolecules (from 9 to 16 kDa), its depolymerization was effective in the bioreactor producing fragments of less than 1 kDa thanks to the in-situ extraction of the reaction products. This paper demonstrates that the reactor configuration is playing an essential role in triggering or preventing lignin condensation. It also reports the first proof-of-concept demonstrating that in-situ membrane extraction of the reactive fragments of lignin from the bulk medium can be useful against detrimental repolymerization reactions.
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Submitted on : Friday, September 11, 2020 - 3:05:00 PM
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Virginie Steinmetz, Maud Villain-Gambier, Armand Klem, Isabelle Ziegler, Stephane Dumarcay, et al.. In-situ extraction of depolymerization products by membrane filtration against lignin condensation. Bioresource Technology, Elsevier, 2020, 311, pp.123530. ⟨10.1016/j.biortech.2020.123530⟩. ⟨hal-02882142⟩

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