KRAFT LIGNIN AS AN ADDITIVE IN PINE AND EUCALYPTUS PARTICLE COMPOSITION FOR BRIQUETTE PRODUCTION

Walter Torezani Neto Boschetti,Angélica De Cássia Oliveira Carneiro,Robisnéia Adriana Ribeiro,Alice Do Carmo Precci Lopes,Rafael Quezada Reyes

doi:10.1590/1806-90882019000200001

Walter Torezani Neto Boschetti, Angélica De Cássia Oliveira Carneiro + Show 3 more

Open Access

https://doi.org/10.1590/1806-90882019000200001

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Abstract

ABSTRACT The objective of this study was to evaluate the properties of briquettes produced with different proportions of pine and eucalyptus wood, as well as to characterize the potential of kraft lignin as an additive in the composition of briquettes for energy generation. The treatments differed from one another in the pine and eucalyptus wood particle ratios (0, 25, 50, 75 and 100%), as well as for the kraft lignin content (0, 2, 4, 6, 8, 10, and 12%). The biomasses were characterized by their physical and chemical properties, and briquette properties were evaluated according to apparent density, lower calorific value (LCV), energy density, and maximum burst load. The results showed an increase in the apparent density as the proportion of lignin and eucalyptus in the briquettes increased. The particle composition of the briquettes had a higher influence on the energy density increase compared to the addition of kraft lignin, being more significant in briquettes produced with higher proportions of eucalyptus. It was also observed that the addition of lignin increased the resistance to the rupture load, and that there was a specific value at which this resistance was higher (at 7% or 11% of lignin, depending on the proportion of particles). Additionally, the briquettes made with 100% pine achieved greater mechanical resistance. In general, kraft lignin presented good potential for use as a briquette additive, contributing to improved energy and mechanical properties.

Highlights

Kraft lignin from the cellulosic pulp industry is currently used as fuel in the chemical recovery cycle of black kraft liquor, given its potential for thermal energy generation
The results showed an increase in the apparent density as the proportion of lignin and eucalyptus in the briquettes increased
The apparent density in the briquettes increased with the lignin content and, with the increase of up to 75% of eucalyptus particles in its composition

Summary

Introduction

Kraft lignin from the cellulosic pulp industry is currently used as fuel in the chemical recovery cycle of black kraft liquor, given its potential for thermal energy generation. An attractive alternative for the pulp industry is to extract part of the lignin from the black liquor for commercialization as an additive, which can be used in the production of briquettes, phenolic resins, dispersants and surfactants (Lora et al, 2002; Gosselink et al, 2004). Lignin is a phenolic macromolecule that forms part of the chemical composition of the wood, acting on the adhesion of fibers. Alternative forms of lignin isolation to cooking the wood, entail significant differences in its structures and physical and chemical properties, including its original shape in the wood, which changes its potential for application (Glaser, 1981). There are still few studies related to the topic (Gouvêa et al, 2010; Valadares et al, 2011)

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