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Scale-Up of a Two-Stage Cu-Catalyzed Alkaline-Oxidative Pretreatment of Hybrid Poplar

Journal Article · · Industrial and Engineering Chemistry Research
 [1];  [2];  [3];  [4];  [2];  [2];  [5];  [6];  [7];  [7];  [2];  [4];  [2];  [8]
  1. Montana State University, Bozeman, MT (United States); Montana State University
  2. Michigan State University, East Lansing, MI (United States)
  3. Montana State University, Bozeman, MT (United States); University of Kansas, Lawrence, KS (United States)
  4. University of Wisconsin─Madison, WI (United States)
  5. Beijing Forestry University (China)
  6. Montana State University, Bozeman, MT (United States)
  7. North Carolina State University, Raleigh, NC (United States)
  8. Montana State University, Bozeman, MT (United States); Luleå University of Technology (Sweden)

A two-stage alkaline-oxidative pretreatment of hybrid poplar was investigated at scale (20 L reactor volume) with the goals of understanding how reaction conditions as well as interstage mechanical refining impact downstream process responses. The pretreatment comprises a first stage of alkaline delignification (alkaline pre-extraction) followed by a second delignification stage employing Cu-catalyzed alkaline hydrogen peroxide with supplemental O2 (O2-enhanced Cu-AHP). Increasing pre-extraction severity (i.e., temperature and alkali loading) and pre-treatment oxidation (increasing H2O2 loading) were found to increase mass and lignin solubilization in each stage. Lignin recovered from the first stage was subjected to oxidative depolymerization and led to aromatic monomer yields as high as 23.0% by mass. As a result, lignins recovered from the second stage Cu-AHP pretreatment liquors were shown to exhibit aliphatic hydroxyl contents more than six-fold higher than for a typical hardwood kraft lignin, indicating these lignins could serve as a biobased polyol for a range of polyurethane applications.

Research Organization:
Michigan State University, East Lansing, MI (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Bioenergy Technologies Office (BETO)
Grant/Contract Number:
EE0008148
OSTI ID:
2328124
Journal Information:
Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 14 Vol. 63; ISSN 0888-5885
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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