Penetration of water and black liquor into overthick and treated wood chips.

ABSTRACT In this paper, the penetration of water and black liquor into overthick and pre-treated overthick chips (cracked and re-chipped according to thickness) was studied with a laboratory impregnator to investigate ways to improve penetration. Overthick chips were divided in three categories: knot-containing chips, chips without knots and original overthick chips. The results of the penetration experiments were evaluated in…

Modelling of chemical pulp bleaching.

ABSTRACT A predictive pulp bleaching model utilizing physical phenomenon models and chemical reaction kinetics is introduced. Examples dealing with buffering properties of pulps, mass transfer limitations in fibre wall, and the kinetics of hexenuronic acid hydrolysis were used to elucidate the use of the model.

Reactions and Kinetics of Cl(III) Decomposition.

ABSTRACT Several pathways leading to the decomposition of chlorite and chlorous acid have been published. In this study, both experimental and computational approaches have been applied to clarify the authenticity of the different routes. The decomposition of chlorine (III), i.e. chlorous acid and chlorite, was monitored with iodometric titration at changing chloride concentrations, temperature, and existence of iron (III) at…