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Multi-pass flow-through reductive catalytic fractionation

Journal Article · · Joule
 [1];  [2];  [2];  [1];  [1];  [1];  [2];  [3];  [4];  [5];  [3];  [6];  [2]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. ExxonMobil Research and Engineering, Clinton, NJ (United States)
  4. ExxonMobil Chemical Company, Baytown, TX (United States)
  5. Katholieke Univ. Leuven, Heverlee (Belgium)
  6. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Reductive catalytic fractionation (RCF) is a promising lignin-first biorefining strategy that selectively extracts and depolymerizes lignin from whole biomass. Flow-through (FT)-RCF enables physical separation of the biomass and catalyst, but this process configuration typically operates at high solvent-to-biomass ratios. Here, we demonstrate multi-pass FT-RCF, wherein the lignin-enriched solvent obtained after an initial FT-RCF step is recycled and used in subsequent FT-RCF without intermediate lignin recovery. Multi-pass FT-RCF reduces the solvent-to-biomass ratio from 48 to 1.9 L/kg, which is a lower solvent loading than is accessible in batch reactors, without negative impacts on delignification and monomer yield with up to 12 wt % lignin in the solvent. Overall, this work demonstrates that solvent demand in RCF processes, which is a key cost and energy driver to enable this process at scale, can be reduced by recycling lignin oil between RCF reactions.
Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1877363
Report Number(s):
NREL/JA-2A00-81807; MainId:82580; UUID:124d7a34-53d3-4e2b-ba6b-0d8fabf2ac34; MainAdminID:64898
Journal Information:
Joule, Journal Name: Joule Journal Issue: 8 Vol. 6; ISSN 2542-4351
Publisher:
Elsevier - Cell PressCopyright Statement
Country of Publication:
United States
Language:
English

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