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Phragmites australis  (an invasive plant in North America) was used as feedstock for ABE (acetone-butanol-ethanol) fermentation by  Clostridium saccharobutylicum . Sulphuric acid pretreated phragmites hydrolysate (SAEH) without detoxification inhibited butanol production (0.73 g/L butanol from 30 g/L sugars). The treatment of SAEH with resin L-493 prior the fermentation resulted in no inhibitory effects and an ABE titer of 14.44 g/L, including 5.49 g/L butanol was obtained, corresponding to an ABE yield and productivity of 0.49 g/g and 0.60 g/L/h, respectively. Dual functionality of the resin was realized by also using it as an  in-situ  product removal agent. Integrating  in-situ  product removal allowed for the use of high substrate concentrations without the typical product inhibition. Resin-detoxified SAEH was supplemented with neat glucose and an effective ABE titer of 33 g/L (including 13.7 g/L acetone, 16.4 g/L butanol and 1.9 g/L ethanol) was achieved with resin-based  in-situ  product removal, corresponding to an ABE yield and productivity of 0.41 g/g and 0.69 g/L/h, respectively. Both detoxification of the substrate and the products was achieved by the same resin, which was added prior the fermentation. Integrating hydrolysate detoxification and  in-situ  butanol removal in a batch process through single resin can potentially simplify cellulosic butanol production.

Combined Detoxification and In-situ Product Removal by a Single Resin During Lignocellulosic Butanol Production