WOOD RESEARCH Volume 71, Number 2, 2026
RICARDO DE CARVALHO BITTENCOURT, STÉPHANI CAROLINE DE LANA ARÊDES, GABRIEL DE CASTRO BRUMANO, ISABELLE LUISA DA SILVA FERREIRA, GABRIEL MACHADO AUGUSTO, and MARCELO MOREIRA DA COSTA

The Production of Bleached Hardwood Kraft Market Pulp Utilizing Corymbia spp. Wood

Forestry innovation in wood quality seeks to enhance pulp and paper industry performance, particularly in the production of bleached hardwood kraft pulp (BHKP), by reducing operating costs through lower specific wood consumption (SWC) and decreased bleaching chemical demand. In this study, 16 clones of Eucalyptus spp. and Corymbia spp., developed by Aperam BioEnergia Co., were initially evaluated and ranked, with the top six selected for further analysis. The objective was to assess their performance during the bleaching stage of kraft pulping. Pulp quality was determined based on intrinsic viscosity, brightness, and chemical composition. The hybrid ID 3 (Corymbia citriodora × Corymbia torelliana) showed superior performance, achieving 93.0% ISO brightness, 54.8% oxygen delignification efficiency, an S/G ratio of 3.62, and xylan content of 16.4%. It also presented the highest intrinsic viscosity (912.5 dm³/kg), indicating its strong potential for industrial application

WOOD RESEARCH Volume 70, Number 1, 2025
RICARDO DE CARVALHO BITTENCOURT, MATHIAS TEIXEIRA MARÇAL, STÉPHANI CAROLINE DE LANA ARÊDES, GABRIEL MARTINS DAVID, TIAGO GUIMARÃES, GABRIEL DE CASTRO BAIAO BRUMANO, and MARCELO MOREIRA DA COSTA

Short notes. Prolonged Impregnation of Bamboo chipsin Pre-Hydrolysis kraft pulping for Dissolving pulp production

The aim of the article was to compare the feasibility of different impregnation processes of chips and production of soluble bamboo pulp by the pre-hydrolysis kraft (PHK) method.The chips made of Bambusa vulgariswere subjected to prolonged or conventional impregnation with white liquor, followed by the pre-hydrolysis, neutralization, kraft cooking and washing stages. The brown pulp was subjected to a bleaching process using an elemental chlorine-free (ECF) sequence. The results showed that prolonged impregnation provided greater delignification and lower reagent consumption than conventional impregnation. The pulp produced from prolonged impregnation with 14% effective alkali (EA) presented the best properties for dissolution, with intrinsic viscosity of 437 dm3/kg, brightness of 88% ISO, xylan content of 3.48% and glycan content of 94.5%. TAC consumption was low for both impregnations. The study concluded that Bambusa vulgaris can be used in the production of dissolving pulp, mainly for viscose grade