On the hydrothermal depolymerisation of kraft lignin using glycerol as a capping agent
Journal article, 2023

Depolymerisation of kraft lignin under hydrothermal conditions was investigated at short residence times (1–12 min) with glycerol being used as a capping agent. The weight average molecular weight (M w) of the products decreased within the first minute of residence time, with the inter-unit ether linkages breaking accordingly. Furthermore, the M w of the product fractions decreased at increasing residence times, while the char yield increased. Short residence times thus appear to be beneficial for mitigating the formation of char. Also, addition of NaOH reduced the yield of char. Although the addition of glycerol caused a decrease in the M w of the products, it seemed to increase the yield of char and therefore might not be a suitable capping agent for kraft lignin depolymerisation.

HTL

hydrothermal liquefaction

kraft lignin

depolymerisation

glycerol

Author

Anders Ahlbom

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Marco Maschietti

Aalborg University

Rudi Nielsen

Aalborg University

Merima Hasani

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Hans Theliander

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Holzforschung

0018-3830 (ISSN) 1437-434X (eISSN)

Vol. 77 3 159-169

Från lignin till biobränslen och specialkemikalier

Swedish Energy Agency (45395-1), 2018-01-01 -- 2021-12-31.

Subject Categories

Applied Mechanics

Paper, Pulp and Fiber Technology

Forest Science

DOI

10.1515/hf-2022-0146

More information

Latest update

3/21/2023