Using guaiacol as a capping agent in the hydrothermal depolymerisation of kraft lignin
Artikel i vetenskaplig tidskrift, 2023

The depolymerisation of softwood kraft lignin was investigated, under hydrothermal conditions at 290 °C and 250 bar, with guaiacol in the reactor feed to evaluate its impact on the formation of char and on the molecular weights of the products. The effect of residence time was investigated in the time span 1-12 min. Lignin is depolymerised during the process and guaiacol is both formed and consumed during the reaction, with clearly noticeable changes as early as in the first minute of reaction. Although the addition of guaiacol in the reactor feed causes a reduction in the weight average molecular weight of the products, the yield of char increases. Longer residence times result in repolymerisation of the reaction products as well as a further increase in the yield of monoaromatic components and char.

hydrothermal depolymerisation

guaiacol

capping agent

HTL

kraft lignin

Författare

Anders Ahlbom

Chalmers, Kemi och kemiteknik, Kemiteknik

Marco Maschietti

Aalborg Universitet

Rudi Nielsen

Aalborg Universitet

Merima Hasani

Chalmers, Kemi och kemiteknik, Kemiteknik

Hans Theliander

Chalmers, Kemi och kemiteknik, Kemiteknik

Nordic Pulp and Paper Research Journal

0283-2631 (ISSN) 2000-0669 (eISSN)

Vol. 38 4 619-631

Ämneskategorier

Pappers-, massa- och fiberteknik

Kemiska processer

DOI

10.1515/npprj-2023-0013

Mer information

Senast uppdaterat

2024-03-07