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Title: High Titer Ethanol and Lignosulfonate Production from SPORL Pretreated Poplar at Pilot Scale

Source: Frontiers in Energy Research

Author(s)Zhou, Haifeng; Zhu, J. Y.; Gleisner, Roland; Qiu, Xueqing; Horn, Eric

Publication Year: 2015  View PDF »

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

Abstract: Poplar NE222 (Populus deltoides Bartr. ex Marsh P. nigra L.) wood chips were pretreated in a 390 L pilot-scale rotating wood-pulping digester using a dilute sulfite solution of approximately pH 1.8 at 160°C for 40 min for bioconversion to ethanol and lignosulfonate (LS). An estimated combined hydrolysis factor (CHF) of 3.3 was used to scale the sulfite pretreatment temperature and time from laboratory bench scale experiments, which balanced sugar yield and inhibitor formation to facilitate high titer ethanol production through fermentation using S. cerevisiae YRH400 without detoxification. A terminal ethanol titer of 43.6 g L-1 with a yield of 247 L tonne wood-1 was achieved at total solids loading of 20%. The relatively low ethanol yield compared with yield from Sulfite pretreatment to overcome the recalcitrance of lignocelluloses (SPORL)-pretreated softwoods was due to inefficient utilization of xylose. The LS from SPORL has a substantially higher phenolic group (Ph- OH) content, though it was less sulfonated and had a lower molecular weight than a purified commercial softwood LS, and therefore has potential for certain commercial markets and future novel applications through further processing. The conversion efficiency achieved through process integration and simplification, demonstrated here, has significant importance to the entire supply chain of biofuel production from woody biomass.

Keywords: forest biorefinery; biofuel; process scale-up; high solids fermentation; enzymatic saccharification/hydrolysis; lignosulfonate; poplar wood

Publication Review Process: Formally Refereed

File size: 1,478 kb(s)

Date posted: 09/25/2015

This publication is also viewable on Treesearch:  view
RITS Product ID: 75520
Current FPL Scientist associated with this product
Zhu, JunYong
Research General Engineer
  

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