Utiliza??o de surfactantes, na polpa??o kraft de madeira de eucalipto, como auxiliar na remo??o de extrativos lipofílicos

摘要

Extractives are pitch precursors and may decrease pulping efficiency and affect pulp quality. Probably, the most efficient way to minimize pitch problems is to remove their precursors from the system during cooking, pulp washing and oxygen delignification. Use of surfactants as pulping additives has been investigated but technical information is deficient and industrial application is very incipient. The objective of this study was to analyze the performance of different surfactants as additives for kraft pulping of Eucalyptus wood. Twenty surfactants with different basic chemical structures were used. The results demonstrated that utilization of surfactant presents promising results as an additive for kraft pulping.