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

WOOD RESEARCH Volume 68, Number 3, 2023
MARCELO MOREIRA DA COSTA, Rodrigo Fraga De Almeida, Maria Tereza Angeletti Nunes, RICARDO DE CARVALHO BITTENCOURT, Larissa Soares Silva, Cassiano Rodrigues De Oliveira, Ana Márcia Macedo Ladeira Carvalho, and Sebastião Renato Valverde

Comparative Study between the Chemi-Thermo Mechanical Pulping from Eucalyptus spp., Bambusa vulgaris and Dendrocalamus asper

In this study, pulps of the species Bambusa vulgaris and Dendrocalamus asper were produced through the chemi-thermo mechanical pulping process, which had their morphological and mechanical properties compared with industrially produced Eucalyptus spp. pulp. The total yields of the pulping processes were 71.3 and 77.0% for the species Bambusa vulgaris and Dendrocalamus asper, respectively. The higher basic density presented by the biomass of the Dendrocalamus asper species can lead to a high productivity. Both bamboo species led to pulps with higher mechanical properties compared to industrial Eucalyptus spp. pulp. The pulp of Bambusa vulgaris stood out in terms of mechanical properties, reaching a higher level of mechanical properties with less energy spent on refining, being indicated for the production of papers for applications where high tensile index is required. Dendrocalamus asper pulp proved to be more suitable for applications, in which high liquid absorption capacity is required due to its high bulk.