'Lignin and extractives first' conversion of lignocellulosic residual streams using UV light from LEDs
Journal article, 2021

Lignocellulosic biomass, especially lignin and extractives, has the potential to substitute fossil precursors in the chemical industry. The conversion of lignin has been intensively researched, but challenges remain as high temperatures and increased pressure are commonly used, which is not energy efficient. Lignin and wood extractives bear chromophoric groups that can absorb light in the ultraviolet (UV) region, which enables photochemical reactions. Ultraviolet light emitting diodes (UV-LEDs) are an emerging technology; they are cheap, versatile, and energy-efficient compared to existing mercury lamps. UV-LEDs were used in this study as a proof of concept for the valorisation of a lignocellulosic residual stream from the pulp and paper industry, sawdust. In a process at ambient temperature and pressure and without the use of a catalyst, we have shown that lignin and extractives can be valorised using light from UV-LEDs. Simplified lignin model compounds were used to pinpoint chemical reactions during irradiation, and to ease the analysis of the sawdust samples. The rate of conversion upon irradiation of the model compounds was found to be 0.7-2.3 g L-1 h(-1), depending on the concentration of the starting compounds.

Author

Jonna Hynynen

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Process and Reaction Engineering

Alexander Michael Riddell

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Process and Reaction Engineering

Abdenour Achour

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Process and Reaction Engineering

Zoltan Takacs

University of Gothenburg

Mats Wallin

Södra

Jim Parkas

Södra

Diana Bernin

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Process and Reaction Engineering

Green Chemistry

1463-9262 (ISSN) 1463-9270 (eISSN)

Vol. In Press

Optimizing the yield of bio based chemicals from lignocellulosic waste using UV light and photosensitizers

Södra (2020-168), 2020-10-01 -- 2021-09-30.

Can lignocellulosic waste products be converted into biobased chemicals and biofuels with the help of UV light

Södra (2019-102), 2019-09-01 -- 2020-03-31.

Bio-based chemicals and fuels by decoupling forestry raw material using photolysis based on LED

ÅForsk (19-597), 2019-08-01 -- 2020-12-31.

Valorization of lignocellulosic biomass for non-fossil chemicals and fuels using photolysis based on LED

Swedish Research Council (VR) (2019-04066), 2020-01-01 -- 2023-12-31.

Subject Categories

Paper, Pulp and Fiber Technology

Chemical Process Engineering

Bioenergy

DOI

10.1039/d1gc02543k

More information

Latest update

10/14/2021