Converts Lignin to Aromatic Chemicals and Lowers the Cost of Refining Biomass
This process uses a low-cost catalyst to efficiently degrade the lignin in biomass into valuable aromatic compounds. Although lignin is the second most abundant polymer found in nature, after cellulose, only two percent of lignin generated from industrial processing goes directly to commercial products. High-value aromatic chemicals such as jet fuel can be created from depolymerization of lignin, but its complex, heterogeneous structure makes it difficult to depolymerize and separate from the cellulose components of biomass. Typically, refineries chemically pretreat biomass to make the cellulose components susceptible to depolymerization via costly enzymes. Less-expensive processes depolymerize the lignin component of biomass first, but this requires strong acids or complex metals and must occur under harsh reaction conditions.
Researchers at the University of Florida have developed a procedure that converts biomass-derived lignin into aromatic chemicals for synthesis into valuable hydrocarbons. Substituting a persulfate catalyst for hydrogen peroxide drives lignin depolymerization under mild reaction conditions and increases the yield of aromatic compounds.
Application
Process using a low-cost persulfate catalyst to break down lignin into component aromatic chemicals
Advantages
- Degrades lignin in biomass using abundant and inexpensive materials, reducing biofuel production costs
- Substitutes a persulfate catalyst for hydrogen peroxide, depolymerizing lignin under mild reaction conditions for easier integration with biorefineries
- Yields valuable phenolic monomers, providing feedstock for high-value chemicals and products such as jet fuel
Technology
A persulfate-based catalyst and transition metal depolymerize the lignin component of biomass. This lowers the cost of cellulose biorefinery and yields valuable aromatic compounds. The persulfate’s strong oxidation power reduces reaction harshness necessary to degrade lignin into low molecular weight aromatic and phenolic oligomers or monomers. Synthesized phenolic monomers are useful as component materials for high-value chemicals, such as jet fuel.
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