(434c) Selectively Cleaving Carbon?Carbon Interunit Linkages in Lignins to Boost Monomer Production
- Conference: AIChE Annual Meeting
- Year: 2017
- Proceeding: 2017 Annual Meeting
- Group: Forest and Plant Bioproducts Division - See also ICE
- Time: Tuesday, October 31, 2017 - 4:07pm-4:32pm
In recent years tremendous efforts have been made to valorize lignin. One of the extensively-studied pathways is to depolymerize lignin biopolymer into monomers. Typically, monomer yields of 10-50% can be obtained by cleaving beta-O-4 interunit carbonâoxygen linkages present in various lignins. Further improvement of monomer yields is limited by interunit carbonâcarbon linkages formed during lignin biosynthesis and biomass pretreatment. To fully valorize lignin, it is essential to find a proper way to cleave these carbonâcarbon linkages.Â In this presentation, we will report our recent work on screening catalyst for disrupting interunit carbonâcarbon linkages in lignins. We found a series of inexpensive non-noble metal catalysts able to selectively cleave various interunit carbonâcarbon linkages in dimeric lignin models at moderate temperatures. With these catalysts, improved monomer yields were obtained from condensed technical lignins by cleaving not only interunit carbonâoxygen but also interunit carbonâcarbon linkages.