MODIFICATION OF JACK PINE TMP LONG FIBERS BY ALKALINE PEROXIDE – PART 1. CHEMICAL CHARACTERISTICS OF FIBERS AND SPENT LIQUOR
The purpose of this work was to improve the quality of jack pine TMP long fibers, particularly with respect to the strength properties, by alkaline peroxide treatment. This paper reports the chemical characteristics of the treated long fibers and the spent liquors originating from various treatments. It was observed that, in comparison with hydrogen peroxide, the alkalinity of the treatment solutions had a greater influence on most fibre characteristics and spent liquor properties.
Minimum Impact Mill Technologies
The Minimum Impact Mill Technologies which can meet the environmental challenges of the pulp and paper industry are discussed in this chapter. These include Optimised wood handling; Dry Debarking; High Yield Pulping Process; Extended Modified cooking; Efficient Brownstock Washing/Improved Pulp Washing; Oxygen Delignification; Ozone bleaching; ECF and TCF bleaching; Fortification of extraction stages with oxygen and hydrogen peroxide; HexA Removal; Condensate Stripping and Recovery; Minimum SO2 and NOx Emissions; Electrostatic Precipitators; Increase in the dry solids content of black liquor; Installation of scrubbers on the recovery boiler; Incineration of odorous gases in the lime kiln; Installation of low NOx technology in auxiliary boilers and the lime kiln; SNCR on bark boilers; Over Fire Air Technique on recovery boilers; Installation of improved washing of lime mud in recausticizing; Efficient Primary, Secondary and Tertiary Waste Treatment (in some special cases); Partial system closure; Minimum Power Consumption; Waste water Recycling and reuse.
Alkaline peroxide mechanical pulping of hardwoods
On presente un nouveau procede de mise en pâte mecanique avec blanchiment au peroxyde avant raffinage des copeaux. Apres avoir ete traites a la vapeur, les copeaux sont compresses dans une presse a vis puis subissent un dechiquetage modere, ce qui permet la penetration des produits chimiques de blanchiment. On presente les resultats obtenus avec des copeaux de tremble et de feuillus melanges.