Acid Precipitation of Kraft Lignin from Aqueous Solutions: The Influence of pH, Temperature, and Xylan
Artikel i vetenskaplig tidskrift, 2019

In this study, the manners in which temperature (45–77 °C) and the addition of xylan (5 g/95 g lignin) influence the onset of precipitation and evolution of the particle size distribution during acid precipitation of softwood kraft lignin were investigated in situ. No systematic trend between the onset pH of precipitation and the temperature or the addition of xylan could be observed at these conditions: the average onset pH was found to be 9.3. However, the size of the agglomerates increased as the temperature was increased, but added xylan rendered a decrease in agglomerate size. A higher onset pH was measured at increased Na ion concentration. The results indicate that the ionization degree of the phenolic groups influences the precipitation at 1 M Na ions but it is also probable that the degree of ionization of the carboxylic groups (on kraft lignin and xylan) influences precipitation (particle numbers and sizes).

particle size distribution

Acid precipitation

xylan

kraft lignin

Författare

Tor Sewring

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk reaktionsteknik

Julie Durruty

Chalmers, Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

Lynn Schneider

Chalmers, Kemi och kemiteknik

Helen Schneider

Chalmers, Kemi och kemiteknik

Tuve Mattsson

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk reaktionsteknik

Hans Theliander

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk reaktionsteknik

Journal of Wood Chemistry and Technology

0277-3813 (ISSN) 1532-2319 (eISSN)

Vol. 39 1 1-13

Styrkeområden

Energi

Ämneskategorier

Kemiteknik

DOI

10.1080/02773813.2018.1488870

Mer information

Senast uppdaterat

2019-07-20