Recovery of byproducts from the rice milling industry for biofuel production

• E.T. Costa ^[1] ; M.F. Almeida ^[1] ; J.M. Dias ^[1] ; C. Alvim-Ferraz ^[1]
  1. [1] Universidade Do Porto

     Universidade Do Porto

     Santo Ildefonso, Portugal

     
• Localización: Wastes: solutions, treatments and opportunities III / Cândida Vilarinho (dir.), Fernando Castro (dir.), Margarida Gonçalves Neto (dir.), Ana Luísa Fernando (dir.), 2020, ISBN 9780367257774, págs. 326-332
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • In this study, the efficiency of enzymatic esterification and homogenous acid esterification for the reduction of Free Fatty Acid (FFA) content of acid rice bran oil (47 mg KOH g−1) was studied. Further, alkaline transesterification of the pretreated oil mixed with sunflower oil (to achieve FFA content ≤2%) was conducted to maximize fatty acid methyl esters (FAME) production. Homogeneous acid esterification was conducted at respectively 65°C and 45°C, using 2 wt.% and 4 wt.% of H2SO4 as catalyst and 9:1 methanol:oil molar ratio. Enzymatic esterification was performed at 35°C using a 6:1 molar ratio of methanol:oil and 5 wt.% of catalyst. Homogenous acid esterification allowed to achieve the highest acid value reduction (92%), although enzymatic pretreatment alone allowed to obtain the highest FAME content (86 wt.%) compared to acid catalyzed process (41 wt.%). The obtained results show potential of this alternative raw material for bioenergy purposes.