<i>Eucalyptus globulus</i> bark valorization: Production of fibers by Neutral Sulphite Semi-Chemical Process for Liner Paper Manufacture

Andrade, Andrea; Herrera, Orlando Espinoza; Reyes-Contreras, Pablo; Pereira, Miguel; Vásquez-Garay, Francisco

doi:10.1590/2179-8087-FLORAM-2020-0048

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ORIGINAL ARTICLE, Forest Products Science and Tecnology • Floresta Ambient. 28 (2) • 2021 • https://doi.org/10.1590/2179-8087-FLORAM-2020-0048 copy

Eucalyptus globulus bark valorization: Production of fibers by Neutral Sulphite Semi-Chemical Process for Liner Paper Manufacture

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Eucalyptus globulus is the second most important economic forest species in Chile. Its main use is in the kraft pulp industry, where large amounts of bark waste are generated. Due to its fibrous characteristics, E. globulus bark is proposed as an alternative source of fibres for papermaking. This study focuses on obtaining fibres for liner paper manufacture. A neutral sulphite semi-chemical (NSSC) process was performed, varying the sodium sulphite (5% to 16%) and the sodium carbonate (2% and 4%) concentrations using two reaction temperatures (160°C and 170°C). The NSSC process at 170°C, 16% of sulphite, and 2% of sodium carbonate proved to be the best condition to obtain higher mechanical performance of papers. As the pulping conditions become more drastic, the yield drops, and the physicomechanical properties of paper increases. Results showed that pulps from E. globulus bark could turn into source of fibres for papermaking and other related products.

Keywords:
Biomass valorisation; papermaking; paperboard; NSSC pulping

Component	Miranda, 2012Miranda I, Gominho J, Pereira H. Incorporation of bark and tops in Eucalyptus globulus wood pulping. BioResources 2012: 7(3): 4350-4361. Doi: 10.15376/biores.7.3.4350-4361. https://doi.org/10.15376/biores.7.3.4350...	Fernández, 2014	Neiva, 2018Neiva DM, Araújo S, Gominho J, de Cássia Carneiro A, Pereira H. Potential of Eucalyptus globulus industrial bark as a biorefinery feedstock: Chemical and fuel characterization. Industrial Crops and Products 2018: 123: 262-270. Doi: 10.1016/j.indcrop.2018.06.070. https://doi.org/10.1016/j.indcrop.2018.0...	This work
Extractives, %	5.3	4.3	6.6	6.4
Lignin, %	16.9	21.4	21.9	21.0
Glucans, %	56.0	41.0	37.5	39.9
Xylan/mannan, %	23.7	13.5	23.6	23.0
Other, %	-	19.8	10.4	9.7

Temperature, ºC	Sulphite, %	Refined pulp yield, %	Cellulose (glucans), %	Hemicellulose (xylan/mannan), %	Acid soluble Lignin, %	Acid insoluble Lignin, %	Total lignin, %
Temperature, ºC	Sulphite, %	Calcium carbonate concentration, 2 %w/v
160	5	61.7	43.6	11.2	1.3	15.8	17.1
	8	58.7	42.9	10.5	1.0	14.2	15.2
	12	56.5	42.1	9.1	1.3	11.8	13.1
	16	53.9	41.7	8.8	1.0	10.4	11.4
170	5	63.1	43.8	9.2	1.3	14.4	15.7
	8	59.5	41.7	9.0	1.4	11.9	13.3
	12	53.5	39.7	8.1	1.5	10.9	12.4
	16	51.2	38.6	7.7	0.9	10.6	11.5

Temperature, ºC	Sulphite, %	Refined pulp yield, %	Cellulose (glucans), %	Hemicellulose (xylan/ mannan), %	Acid soluble Lignin, %	Acid insoluble Lignin, %	Total lignin, %
Temperature, ºC	Sulphite, %	Calcium carbonate concentration, 4 %w/v
160	5	60.5	48.8	13.6	1.7	13.1	14.8
	8	59.8	46.0	12.9	1.5	12.4	13.9
	12	57.1	44.5	11.2	1.3	10.7	12.0
	16	54.4	42.3	9.8	1.4	9.9	11.3
170	5	60.8	46.9	13.0	1.9	15.2	17.1
	8	56.8	44.1	12.1	1.8	13.5	15.3
	12	54.6	43.5	10.7	1.1	12.2	13.3
	16	51.8	42.3	9.2	1.3	10.9	12.2

Instituto de Florestas da Universidade Federal Rural do Rio de Janeiro Rodovia BR 465 Km 7, CEP 23897-000, Tel.: (21) 2682 0558 | (21) 3787-4033 - Seropédica - RJ - Brazil
E-mail: floram@ufrrj.br

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[1] CORRESPONDENCE TOFrancisco Vásquez-Garay Centro de Excelencia en Nanotecnología (CEN), Av. Román Díaz 532, Providencia, Santiago, Chile e-mail: fvasquez@leitat.cl