Acid Precipitation of Kraft Lignin from Aqueous Solutions: The Influence of pH, Temperature, and Xylan
Journal article, 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

Author

Tor Sewring

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

Julie Durruty

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Forest Products and Chemical Engineering

Lynn Schneider

Chalmers, Chemistry and Chemical Engineering

Helen Schneider

Chalmers, Chemistry and Chemical Engineering

Tuve Mattsson

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

Hans Theliander

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

Journal of Wood Chemistry and Technology

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

Vol. 39 1 1-13

Areas of Advance

Energy

Subject Categories

Chemical Engineering

DOI

10.1080/02773813.2018.1488870

More information

Latest update

7/20/2019