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Title: Using a combined hydrolysis factor to optimize high titer ethanol production from sulfite-pretreated poplar without detoxification

Source: Bioresource Technology. 186: 223-231.

Author(s)Zhang, Jingzhi; Gu, Feng; Zhu, J.Y.; Zalesny Jr., Ronald S., Jr..

Publication Year: 2015  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4709-1B

Abstract: Sulfite pretreatment to overcome the recalcitrance of lignocelluloses (SPORL) was applied to poplar NE222 chips in a range of chemical loadings, temperatures, and times. The combined hydrolysis factor (CHF) as a pretreatment severity accurately predicted xylan dissolution by SPORL. Good correlations between CHF and pretreated solids enzymatic digestibility, sugar yield, and the formations of furfural and acetic acid were obtained. Therefore, CHF was used to balance sugar yield with the formation of fermentation inhibitors for high titer ethanol production without detoxification. The results indicated that optimal sugar yield can be achieved at CHF = 3.1, however, fermentation using un-detoxified whole slurries of NE222 pretreated at different severities by SPORL indicated CHF ≈  2 produced best results. An ethanol titer of 41 g/L was achieved at total solids of approximately 20 wt% without detoxification with a low cellulase loading of 15 FPU/g glucan (27 mL/kg untreated wood).

Keywords: Poplar woods; Cellulosic biofuel; High solids processing; Fermentation inhibition; Pretreatment optimization

Publication Review Process: Formally Refereed

File size: 480 kb(s)

Date posted: 04/08/2015

This publication is also viewable on Treesearch:  view
RITS Product ID: 72584
Current FPL Scientist associated with this product
Zhu, JunYong
Research General Engineer
  

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