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Silva Lusitana

versão impressa ISSN 0870-6352


MARTINS, J.; LOPES, L. Cruz  e  ESTEVES, B.. Optimisation of Wood liquefaction of Pinus pinaster with Polyhydric Alcohols. Silva Lus. [online]. 2013, vol.21, n.Especial, pp.177-183. ISSN 0870-6352.

The process of wood liquefaction has been studied over the years, a variety of wood and liquefaction processes have been tested. In recent years, due to the scarcity of oil, the search for new sources to replace oil-derived products has increased and the wood appeared as one of the most viable substitutes. Liquefaction processes at low pressures and temperatures have enormous potential. In this study we used the wood of Pinus pinaster Ait from the region of Águeda. Liquefaction of wood was held on a double shirt reactor with heated oil using ethylene glycol (EG) catalyzed by sulfuric acid (SA) at 3%. The liquefied wood was dissolved in a solution of dioxane-water in the proportion 4: 1 and filtered, determining the insoluble residue gravimetrically. Liquefaction times between 10 and 120 min, temperature of 160° C and 180° C and different ratios of wood/ ethylene glycol, 1-2, 1-3 1-6 and 1-8 were tested in order to optimize the percentage of liquefaction. The results show that the higher the temperature, the higher the percentage of liquefaction. At the same temperature liquefaction percentage increases with the time of treatment according to a logarithmic curve approximately until it reaches a maximum and then decreases, possibly due to condensation reactions of liquefaction products. The percentage of maximum liquefaction was obtained after 30 min at 180° C (about 80%) and 60 min at 160° C (about 70%). It was found that the ratio of wood/ethylene glycol influenced the percentage of liquefaction, which ranged between 62% and 88% and the ratio which showed best results was 1: 6.

Palavras-chave : Liquefied wood; optimization; polyhydric alcohols; Pinus pinaster.

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