Mild steam explosion followed by kraft cooking and oxygen delignification of spruce (Picea abies)

Kerstin Jedvert; Anna Saltberg; Hans Theliander

Mild steam explosion followed by kraft cooking and oxygen delignification of spruce (Picea abies)
Journal article, 2013

The paper considers mild steam explosion as an initial biorefinery process step to make wood more accessible for chemicals and enzymes in subsequent extraction and isolation procedures. Wood chips were exploded at four and seven bars and the effects of the treatments were followed during both kraft cooking and oxygen delignification. The properties of the unbleached and bleached pulps, including kappa number, pulp yield, fibre length, intrinsic viscosity, chemical composition and ISO brightness, were analysed using standard methods. The findings showed a difference between treatment at four and seven bars, as the higher pressure leads to more significant visual changes as well as somewhat increased degradation of hemicelluloses. These changes however, have no apparent significant negative effect on the final pulp properties. To the contrary, a benefit of steam treatment seems that the time to reach a certain kappa number was slightly reduced with steam-exploded wood chips.

hemicellulose

wood

Pulp properties

Norway spruce

cellulose

softwood

fractionation

wheat-straw

hydrolysis

delignification

Kraft cooking

Oxygen

biorefinery

pretreatment

Mild steam explosion

lignin

Author

Kerstin Jedvert

Chalmers, Chemical and Biological Engineering, Forest Products and Chemical Engineering

Other publications Research

Anna Saltberg

Chalmers, Chemical and Biological Engineering, Forest Products and Chemical Engineering

Other publications Research

Hans Theliander

Chalmers, Chemical and Biological Engineering, Forest Products and Chemical Engineering

Other publications Research

Appita Journal

1038-6807 (ISSN)

Vol. 66 4 322-330

Subject Categories (SSIF 2011)

Paper, Pulp and Fiber Technology

More information

Created

10/7/2017

Mild steam explosion followed by kraft cooking and oxygen delignification of spruce (Picea abies) Journal article, 2013

Author

Kerstin Jedvert

Anna Saltberg

Hans Theliander

Appita Journal

Subject Categories (SSIF 2011)

More information

Created

Mild steam explosion followed by kraft cooking and oxygen delignification of spruce (Picea abies)
Journal article, 2013