INVESTIGADORES
AREA Maria cristina
congresos y reuniones científicas
Título:
Application of MFLC from Moringa oleifera and Eucalyptus grandis in a brown kraft pine stock for linerboard
Autor/es:
BENITEZ, J.B.; VALLEJOS M.E.; AREA M. C.; FELISSIA, F. E.
Lugar:
Montevideo
Reunión:
Workshop; I&S WORKSHOP. Insights and strategies towards a bio-based economy; 2016
Institución organizadora:
Universidad de la República; I+D+i . Technological Laboratory of Uruguay (LATU); Instituto Nacional de Investigación Agropecuaria (INIA). Uruguay - VTT - Technical Research Centre of Finland; Faculty of Chemistry and Engineering. Åbo Akademi University. F
Resumen:
A strategyfor a sustainable economic growth is the gradual transition from conventionaleconomy areas to others based on the use of renewable and sustainable biomassfeedstock for the production of bioenergy, biofuels and bioproducts. Moringaoleifera, currently cultivated in Paraguay, Brazil and Bolivia, is commerciallyknown by the nutritional value of its seeds, leaves, stems, and flowers, forhuman and animal consumption. It is a fast growth tree that adapts to a widerange of soils, generating great interest in its cultivation. Eucalyptusgrandis (EG) is, instead, an installed forest resource widely grown in SouthAmerica. Microfibrillated cellulose (MFC) has aroused great interest as abiomaterial, as it has a wide range of potential applications in variousindustries. When fibers are processed with a significant amount of lignin, theproduct is called microfibrillated lignocellulose (MFLC). MFLC production bymechanical fibrillation requires intensive treatment of the fibers, so chemicalor enzymatic treatments can be applied before mechanical fibrillation to reduceenergy consumption. A bleached eucalyptus commercial pulp was microfibrillatedby a treatment including 10000 revolutions in a PFI mill and 2 h in a highshear stress mill. This MFC was used as dry strength additive in laboratorysheets of the same eucalyptus bleached pulp, replacing 5% by weight of thesheet with this material. Obtained results indicate a two or three foldincrease in air flow resistance, burst index, tensile and tear strength whencompared with sheets without the additive. However, a high percentage of MFLCwas lost in the white water in the formation of sheets. The aim of this studywas to apply different percentages of MFLC together with a synthetic polymer asretention aid, on a brown kraft pulp of pine (kappa number 88) used tolinerboard manufacture (base pulp). MFLC was obtained from Eucalyptus grandis(EG) and Moringa oleifera (MO) soda - AQ pulps, treated by two stages of mechanicalfibrillation. EG (kappa number 17) and MO (kappa number 19.5) pulps wererefined in a laboratory refiner (PFI) to Shopper 70, and the refined pulps weremicrofibrillated on a high shear stress mill (Mika brand) at 35,000 rpm for 1 h[1]. Laboratory sheets were prepared adding 2.5, 5.0, and 7.5% of MFLC and0.1%, of the polymer to the base pulp. This could show that the application ofMFLC, which causes an important increase of strength in short-fiber sheets, hasa mild contribution on the strength long-fiber sheets, already high. Moringaoleifera proved to be an interesting raw material for the production of MFLC atPYME level, suitable for silvopastoral projects.