Transforming Waste: Black Liquor’s Path to Green Lubricant Formulations

• E. Cortés Triviño ^[1] ; A. Tenorio-Alfonso ^[1] ; D. Cantero ^[2] ; M.J. Cocero ^[2] ; J.M. Franco ^[1]
  1. [1] Universidad de Huelva

     Universidad de Huelva

     Huelva, España

     
  2. [2] Universidad de Valladolid

     Universidad de Valladolid

     Valladolid, España

     
• Localización: Actas de las VII Jornadas ScienCity 2024: Fomento de la Cultura Científica, Tecnológica y de Innovación en Ciudades Inteligentes / José Manuel Lozano Domínguez (ed. lit.), Estefanía Cortés Ancos (ed. lit.), Manuel Joaquín Redondo González (ed. lit.), Tomás de J. (ed. lit.), Mateo Sanguino (ed. lit.), Iñaki Josep Fernández de Viana González (ed. lit.), Miguel Ángel Rodríguez Román (ed. lit.), 2024, ISBN 9798266036024, págs. 16-16
• Idioma: español
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• Resumen

  • The paper and pulp industry generates approximately 170 million tons of black liquor annually, contributing to the global lignin output of around 60 million tons each year. However, despite the numerous research focusing on lignin depolymerization and its applications, there is a limited number of studies examining the direct use of black liquor as raw material for the synthesis of new bio-based products for many applications [1,2]. In this context, in recent years, numerous studies have highlighted the potential advantages of using polyols derived from biomass for the synthesis of new materials as alternatives to petroleum-based products, thus promoting the production of environmentally friendly polymeric solutions from renewable resources [3]. A notable example is the formulation of novel bio-lubricant synthetized from natural polyols coming from biomass residues and vegetable oils, as well as their derivatives. However, enhancing the lubricating performance of semi-solid lubricant formulations often requires chemical modifications to the functional groups of vegetable oils to enable efficient chemical crosslinking with polyols [4]. This strategy presents new opportunities for the revalorization of black liquor in lubricant applications. In line with this approach, in this study, four different lignin fractions, derived from supercritical water hydrolysis of diluted black liquor, were dispersed into an epoxy-modified vegetable oil in order to produce sustainable lubricant formulations. The rheological properties of the resulting lubricating systems were subsequently characterized to evaluate the influence of the lignocellulosic fractions' composition.