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DOI:
https://doi.org/10.14483/23448393.21172Published:
2024-07-17Issue:
Vol. 29 No. 2 (2024): May-AugustSection:
Chemical, Food, and Environmental EngineeringDetermining the Pulping Conditions and Properties of Unbleached Pulp from Uruguayan Pinus Taeda
Determinación de las condiciones de pulpeo y propiedades de pulpa marrón a partir de Pinus taeda Uruguayo
Keywords:
kraft pulp, Paper properties, Pinus taeda (en).Keywords:
Pulpa kraft, Propiedades papeleras, Pino Taeda (es).Downloads
Abstract (en)
Context: In Uruguay, numerous Pinus taeda plantations are at final-turn age, but they still do not have commercial destination and are exported as green-wood logs. For the development of this sector, it is necessary to strive towards a comprehensive processing of this resource.
Method: This work focused on analyzing the use of Pinus taeda wood available in the country to produce brown kraft pulp with a kappa number of 80, which can be used to make packaging paper. As raw materials, we employed by-products from the mechanical wood-transformation industry (wood chips and thinning wood) and final-turn wood. Pulping tests were carried out, varying the alkali charge and the H-factor while aiming for a kappa number of 80. The viscosity, pulping, and rejection yield were measured in the pulps, and the pH and residual alkali content were evaluated in black liquor.
Results: Based on the results, the best pulping conditions were an active alkali charge of 14% (Na2O) and an H-factor of 1260 for sawmill chips and thinning wood, as well as an active alkali charge of 14% (Na2O) and an H-factor of 1080 for final-turn wood. The pulp obtained with sawmill chips exhibited the most resistant fibers, and the final-turn wood pulp was the most sensitive to the refining process. Under the aforementioned conditions, the paper properties of laboratory-produced pulp are comparable with those of commercial pulp.
Conclusions: This indicates that it is technologically possible to produce brown kraft pulp from Uruguayan Pinus taeda wood, with adequate quality to produce packaging paper
Abstract (es)
Contexto: En Uruguay existen numerosas plantaciones de Pinus taeda que están en edad de turno final, pero que aún no tienen un destino comercial y se exportan como troncos verdes. Para el desarrollo de este sector, es necesario buscar un procesamiento integral de este recurso.
Método: Este trabajo se enfocó en analizar el uso de la madera de Pinus taeda disponible en el país en la producción de pulpa kraft marrón con un número kappa de 80, que puede utilizarse para fabricar papel de embalaje. Como materia prima, se emplearon subproductos de la industria del aserrado (chips y madera de raleo) y madera de turno final. Se realizaron ensayos de pulpeo, variando la carga de álcali y el factor H con el objetivo de alcanzar un número kappa de 80. Sobre las pulpas se midieron la viscosidad, el rendimiento del pulpeo y el rechazo, y se evaluaron el pH y el contenido de álcali residual sobre el licor negro.
Resultados: Con base en los resultados, las mejores condiciones de pulpeo fueron una carga de álcali activo del 14 % (Na2O) y un factor H de 1260 para los chips de aserradero y la madera de raleo, así como una carga de álcali activo del 14 % (Na2O) y un factor H de 1080 para la madera de turno final. La pulpa obtenida con chips de aserradero presentó las fibras más resistentes, y la pulpa de madera de turno final fue la más sensible al proceso de refinado. Bajo las condiciones mencionadas, las propiedades papeleras de la pulpa producida en laboratorio son comparables con las de la pulpa comercial.
Conclusiones: Esto indica que es tecnológicamente posible producir pulpa kraft marrón a partir de madera de Pinus taeda uruguaya, con la calidad adecuada para producir papel de embalaje.
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