available to mill-site engineers to solve pitch problems in kraft pulp mills. These problems have been estimated to cause losses to the Canadian pulp and paper industry in excess of $80 million each year. The design of the system took into account not only the complexity of the process interactions and the need for accuracy and completeness of recommendations but also the ongoing need for train...

Soap skimmings are an intermediate substrate in the production of tall oil from Kraft pulping black liquor. In this study, biodiesel was produced directly from soap skimmings before being processed into tall oil using acetyl chloride and sulfuric acid as accelerators. The effects of the accelerator amount, reaction time, and pH on the production yield were investigated. The yields of biodiesel ...

The effect of the degree of polymer branching on retention and drainage performance of flocculated kraft pulp fiber suspensions containing precipitated calcium carbonate (PCC) was investigated and has been correlated with flocs properties obtained by light diffraction scattering (LDS). The results show that polymers of medium charge density are more adequate to be used as retention aids since l...

Among the anaerobic systems applied for the treatment of paper industry effluents, the IC (Internal Circulation) reactor is gaining a lot of interest. The reactor combines good biomass retention at the outlet with excellent mixing characteristics in the lower part of the reactor. This leads to smaller reactor volumes and less space requirements. Three examples of IC reactors at various recycle ...

Black liquor is the residue from the kraft paper pulp process and consists, mainly, of water, lignin, organic residues from cellulose and hemicelluloses and inorganic matter (mostly sodium, potassium and sulfur). Before any combustion or gasification, the dry content of the black liquor is increased, typically from 14-18% to 75-80%, to permit autogenous combustion and high conversion efficiency...

Lignin is a precursor of humus, and by-product the pulp paper industry. This study investigated synthesis soil conditioning materials from industrial lignins (kraft, soda sulphite), through ammoxidation. The were characterized ammoxidized in 1 L Parr reactor at 80 °C, 10 barg, for 4 h, with 7 wt% ammonia lignin reaction mixture. A plant trial assessment products was conducted over four weeks. N...

In this study, multifunctional alkaline pulping was suggested to produce different pulp grades at one mill site, ranging from high-yield paper pulp to high-purity dissolving pulp. In all process modifications, sulfur was successfully replaced by anthraquinone. Autohydrolysis and alkaline pre-extraction were applied to Eucalyptus globulus wood chips, followed by kraft and soda-AQ pulping. Alkali...