Now showing items 1-20 of 30

    • Alternative chemo-enzymatic treatment for homogeneous and heterogeneous acetylation of wood fibers 

      Quintana, Elisabet; Ago, Mariko; Valls Vidal, Cristina; Roncero Vivero, María Blanca; Rojas, Orlando J. (2018-07-18)
      Article
      Open Access
      A new chemo-enzymatic treatment is proposed to produce cellulosic fibers suitable for heterogeneous- or homogeneous-phase acetylation. The procedure included enzymatic (laccase–violuric acid) lignin removal from the precursor ...
    • An analysis of academic outcomes in graphic expression subjects in engineering by considering students’ admission profiles 

      Puig Poch, Mireia; Quintana, Elisabet; Voltas Aguilar, Jordi (Springer, 2023)
      Conference lecture
      Restricted access - publisher's policy
      Decree 171/2022 that regulates compulsory post-High School in Catalonia, establishes that Technical Drawing I and II are modality courses, which means that they are not compulsory. So students can choose other modality ...
    • An enzyme-catalysed bleaching treatment to meet dissolving pulp characteristics for cellulose derivatives applications 

      Quintana, Elisabet; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2013-11)
      Article
      Restricted access - publisher's policy
      Bleached cellulose with good end-properties (_90% ISO brightness and 62% cellulose preservation) was obtained by using a totally chlorine-free biobleaching process (TCF). Unbleached sulphite cellulose was treated with ...
    • Anàlisi dels resultats acadèmics a l’assignatura d’Expressió Gràfica en relació amb els perfils d’admissió 

      Puig Poch, Mireia; Quintana, Elisabet; Voltas Aguilar, Jordi (OmniaScience, 2024-01)
      Conference lecture
      Open Access
      El Decret 171/2022 que substiuteix el Decret 142/2008, regula l’educació secundària no obligatòria a Catalunya i estableix que les assignatures de Dibuix Tècnic I i II són assignatures optatives pels cursos de batxillerat ...
    • Análisis de los resultados académico en asignaturas de Expresión Gráfica en la Ingeniería atendiendo a los perfiles de acceso de los estudiantes 

      Quintana, Elisabet; Puig Poch, Mireia; Voltas Aguilar, Jordi (Universidad de Cádiz, 2023)
      Conference report
      Open Access
      Tal y como establece el RD 822/2021 [1], los sistemas de calidad en el ámbito universitario analizan las titulaciones universitarias a través de distintos ámbitos denominados Estándares que, a modo de ejes directivos, ...
    • Assessing the environmental impact of biobleaching: effects of the operational conditions 

      Valls Vidal, Cristina; Quintana, Elisabet; Roncero Vivero, María Blanca (2012-01)
      Article
      Restricted access - publisher's policy
      The environmental impact of enzyme bleaching stages applied to oxygen-delignified eucalypt kraft pulp was assessed via the chemical oxygen demand (COD), color, absorbance spectrum, residual enzyme activity and Microtox ...
    • Assessment of the potential of enzymes to produce dissolving pulps 

      Valls Vidal, Cristina; Quintana, Elisabet; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (Universidade de Aveiro, 2018)
      Conference lecture
      Restricted access - publisher's policy
      In this work, a totally chlorine free (TCF) sequence including a laccase-mediator system was developed in a softwood sulfite pulp. Then, purification was carried out employing strong alkaline extractions and hydrolytic ...
    • Biorefinery: the paper mill of tomorrow 

      Vidal Lluciá, Teresa; Torres López, Antonio Luis; Valls Vidal, Cristina; Cusola Aumedes, Oriol; Quintana, Elisabet; Andreu Terrén, Glòria; Aracri, Elisabetta; Fillat Latorre, Amanda; García Ubasart, Jordi; Beltramino, Facundo; Clemente Escuin, Antonio; Roncero Vivero, María Blanca (Campus de Terrassa de la UPC, 2013-06-13)
      Conference report
      Open Access
    • Bleached dissolving pulps applying laccase treatments 

      Quintana, Elisabet; Valls Vidal, Cristina; Roncero Vivero, María Blanca (2012)
      Conference report
      Restricted access - publisher's policy
      A biobleaching sequence, using a laccase enzyme (Trametes Villosa) in combination with different mediators, was applied to softwood dissolving cellulose in order to study its bleaching efficiency and its potential in terms ...
    • Cellulose acetate films from chemo-enzymatic dissolving pulps 

      Quintana, Elisabet; Ago, Mariko; Valls Vidal, Cristina; Fernández Santos, Julia; Roncero Vivero, María Blanca; Rojas, Orlando J. (2022)
      Conference lecture
      Open Access
      The purpose of this work is to obtain dissolving cellulose fibers that are suitable for the manufacturing of cellulose derivatives. Therefore, the combination of enzymatic and chemical treatments during the bleaching stage ...
    • Cellulose oxidation by Laccase-TEMPO treatments 

      Quintana, Elisabet; Roncero Vivero, María Blanca; Vidal Lluciá, Teresa; Valls Vidal, Cristina (2017-02-10)
      Article
      Open Access
      In this work, laccase-TEMPO (Lac-T) treatments were applied to bleached commercial dissolving pulp in order to introduce carbonyl and carboxyl groups, which were found to improve dry and wet strength-related properties. ...
    • Comparative evaluation of the action of two different endoglucanases. Part I: on a fully bleached, commercial acid sulfite dissolving pulp 

      Quintana, Elisabet; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2015-04-19)
      Article
      Open Access
      A fully bleached commercial acid dissolving pulp was treated with two endoglucanases, one obtained from Paenibacillus barcinonensis (B) and the other one produced from Cerrena unicolor (F) with the intention to improve ...
    • Comparative evaluation of the action of two different endoglucanases. Part II: on a biobleached acid sulphite pulp 

      Quintana, Elisabet; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2015-04-30)
      Article
      Open Access
      A TCF sulphite pulp, bleached at the laboratory scale with a laccase–violuric acid system and complemented with a pressurized hydrogen peroxide stage, was treated with two endoglucanases, one obtained from Paenibacillus ...
    • Dissolving-grade pulp: a sustainable source for fiber production 

      Quintana, Elisabet; Valls Vidal, Cristina; Roncero Vivero, María Blanca (2024-01-10)
      Article
      Open Access
      The global textile fiber output increased five times from 1975 to 2020. Also, in 2010, the combined demand for man-made and natural fibers was projected to increase by 84% within 20 years. Clothing materials are largely ...
    • Effect of residual lignin and heteropolysaccharides in nanofibrillar cellulose and nanopaper from wood fibers 

      Ferrer Carrera, Ana; Quintana, Elisabet; Filpponen, Ilari; Solala, Iina; Vidal Lluciá, Teresa; Rodríguez Pascual, Alejandro; Laine, Janne; Rojas, Orlando J. (2012-12)
      Article
      Restricted access - publisher's policy
      Unbleached (UN), oxygen-delignified and fully-bleached (FB) birch fibers with a residual lignin content of ca. 3, 2 and\1 %, respectively, were used to produce nanofibrillated cellulose (NFC) and nanopaper by using an ...
    • El potencial de la cel·lulosa en la indústria tèxtil 

      Quintana, Elisabet; Valls Vidal, Cristina; Roncero Vivero, María Blanca (OmniaScience, 2022-02-01)
      Conference lecture
      Open Access
      La indústria tèxtil i de la moda és el segon sector industrial més contaminant, després del petroli. Segons l’Agència Europea del Mediambient, el consum de roba per persona a la UE va augmentar un 40 % del 1996 al 2012. ...
    • Endoglucanase treatments for improving pulp reactivity in biobleached and commercial dissolving pulps 

      Quintana, Elisabet; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2015)
      Conference lecture
      Restricted access - publisher's policy
      In this study, a bleached commercial dissolving pulp and a TCF sulphite pulp, bleached at the laboratory scale with a laccase–violuric acid system and complemented with a pressurized hydrogen peroxide stage (LVAPO), were ...
    • Enzymatic and chemical treatments to obtain pulps with high-cellulose content 

      Quintana, Elisabet (Universitat Politècnica de Catalunya, 2016-09-19)
      Doctoral thesis
      Open Access
      La celulosa es el polímero más abundante en la Tierra y en los últimos años ha ganado un amplio interés como fuente de nuevos productos con requisitos de procesamiento y de calidad diferentes a los procesos convencionales ...
    • Enzymatically treated sulphite pulp to give dissolving-pulp characteristics 

      Quintana, Elisabet; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Roncero Vivero, María Blanca (2013)
      Conference report
      Restricted access - publisher's policy
      Bleached cellulose with good end-properties (~90% ISO brightness, < 0.5 kappa number and substantially preserved cellulose integrity) was obtained by using a totally chlorine-free (TCF) biobleaching sequence. The initial ...
    • Evaluating changes on cellulosic biobleached fibers by means of thermogravimetric analysis 

      Quintana, Elisabet; Garcia Barneto, Agustín; Valls Vidal, Cristina; Vidal Lluciá, Teresa; Ariza, J.; Roncero Vivero, María Blanca (2014)
      Conference lecture
      Restricted access - publisher's policy
      The effects on fibre surface produced by the laccase-mediator system on softwood sulphite fibres were analysed in terms of surface crystallinity using thermogravimetric analysis. The starting pulp presented low content of ...