Process systems engineering studies for catalytic production of bio-based platform molecules from lignocellulosic biomass

Abstract

This work presents a process-system engineering study of an integrated catalytic conversion strategy to produce bio-based platform molecules (levulinic acid (LA), furfural (FF), and propyl guaiacol (PG)) from hemicellulose (C5), cellulose (C6), and lignin fractions of lignocellulosic biomass. A commercial-scale process based on the strategy produces high numerical carbon yields (overall yields: 35.2%; C6-to-LA: 20.4%, C5-to-FF: 69.2%, and Lignin-to-PG: 13.3%) from a dilute concentration ofsolute (1.3–30.0wt.% solids), but a high recovery of these molecules requires an efficient separation system with low energy requirement. A heat exchanger network significantly reduced the total energy requirements of the process. An economic analysis showed that the minimum selling price of LA as the highest value-added product (42.3×103t of LA/y using 700×103dry t/y of corn stover) is US$1707/t despite using negative economic parameters, and that this system can be cost-competitive with current production approaches.