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Title: New strategy for liquefying corn stover pellets

Journal Article · · Bioresource Technology
 [1];  [2];  [2];  [2];  [2];  [2];  [3];  [2];  [4];  [4];  [5];  [2];  [2];  [2];  [2]
  1. Purdue University, West Lafayette, IN (United States); Purdue University
  2. Purdue University, West Lafayette, IN (United States)
  3. Purdue University, West Lafayette, IN (United States); Universidad Nacional de Colombia, Bogotá (Columbia)
  4. Idaho National Laboratory (INL), Idaho Falls, ID (United States)
  5. Forest Concepts LLC., Auburn, WA (United States)

The movement of solid material into and between unit operations within a biorefinery is a bottleneck in reaching design capacity, with formation of biomass slurries needed to introduce feedstock. Corn stover slurries have been achieved from dilute acid, pretreated materials resulting in slurry concentrations of up to about 150 g/L, above which flowability is compromised. We report a new strategy to liquefy corn stover at higher solids concentration (300 g/L) by initially cooking it with the enzyme mimetic maleic acid at 40 mM and 150°C. This is followed by 6 h of enzymatic modification at 1 FPU (2.2 mg protein)/g solids, resulting in a yield stress of 171 Pa after 6 h and 58 Pa in 48 h compared to 6806 Pa for untreated stover. Mimetic treatment of corn stover pellets minimizes the inhibitory effect of xylo-oligomers on hydrolytic enzymes. Furthermore, this strategy allows for the delivery of solid lignocellulosic slurry into a pretreatment reactor by pumping, improving operability of a biorefinery.

Research Organization:
Purdue University, West Lafayette, IN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Bioenergy Technologies Office (BETO)
Grant/Contract Number:
EE0008256; AC07-05ID14517
OSTI ID:
1994478
Journal Information:
Bioresource Technology, Journal Name: Bioresource Technology Vol. 341; ISSN 0960-8524
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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