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Increase of the kraft pulping process efficiency from pretreatment of eucalyptus wood chips

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Magnos Alan Vivian
Total Authors: 1
Document type: Doctoral Thesis
Press: Piracicaba.
Institution: Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC)
Defense date:
Examining board members:
Francides Gomes da Silva Junior; Pedro Edson Fardim; André Luiz Ferraz; Graciela Ines Bolzon de Muniz
Advisor: Francides Gomes da Silva Junior

The present study aimed evaluate the efficiency of lignin extraction from wood chips of Eucalyptus grandis x Eucalyptus urophylla from pretreatments with sodium xylenesulphonate (SXS), and determine the optimum conditions of these, in order to increase the efficiency of the pulping and bleaching processes, by reducing the necessity of reagents. First of all proceeded the physical, chemical and morphological characterization of wood. After the chips were submitted to pretreatments from the combination of factors: time (1, 3, 6, 9 and 12 h), concentration of SXS (0, 10, 20 and 30 %) and temperature (110, 120, and 130 °C). After the pretreatments were determined the yield and the level of remaining lignin in the chips, from which was obtained the optimal points for each factor for maximum yield and lignin extraction. With the optimum points for each parameter, these were replicated to obtain pretreated wood chips that were used in the cooking curves from kraft pulping process, and compared with normal chips, both with and without anthraquinone. From the cooking curves were determined the alkaline charge required to obtain pulp with a kappa number of 15 ± 0.5, which was reproduced for evaluation the characteristics of the pulp obtained from the wood chips with and without pretreatment. Later these pulps were bleached, refined and evaluated for their physical and mechanical characteristics. The results of physical, chemical and morphological characterization showed that the wood in question has consonant with the values reported in the literature. The pretreatments with SXS were efficient to lignin extracting. The pretreatment that provided the highest yield was 1 h, 0 %, 117.5 °C; and the highest extraction of lignin was 12 h, 30 %, 130 °C, removing 39,60 % thereof. Based on the cooking curves was observed that the values obtained for yield of pulp from pretreated wood chips with SXS were much lower than normal chips, but in other hand showed a high delignification degree, being possible obtain pulp with the same kappa number with active alkali charges considerably smaller than for normal chips, thereby increasing the efficiency of the pulping process. For pulp with the same kappa number (15 ± 0.5) the alkaline charge required was 34.8 and 37.6 % lower for pretreated wood chips with SXS, without and with anthraquinone, respectively, when compared with normal chips. The pulps obtained from the pretreated wood chips showed higher efficiency in the pre-delignification with oxygen and higher bleachability. For physical and mechanical tests, the pulps obtained by pretreatment with SXS presented good performance in physical properties, but were lower in mechanical tests. In general way, the pretreatment of the wood chips of E. grandis x E. urophylla with SXS was efficient in the lignin extraction, reducing the necessity of the chemicals in pulping and bleaching stages, increasing the efficiency of both. Thus it is recommended pretreatment of 12 h, 30 % SXS 130 °C to remove as much of the lignin from the chips, in order to optimize the kraft pulping process, reducing the need for reagents. (AU)

FAPESP's process: 11/19961-5 - Increase of the kraft pulping process efficiency from pretreatment of eucalyptus wood chips
Grantee:Magnos Alan Vivian
Support type: Scholarships in Brazil - Doctorate