Samples of Eucaliptus globulus were subjected to isothermal autohydrolysis (temperature: 220-250ºC and isothermal residence time 0-250ºC). The effect of the H factor on the sugar yield and composition of both liquid and solid phases obtained after the treatments has been studied. The furfural concentration and composition has been determined. A central composite experimental design, in conjunction with the neural fuzzy model, was used to the furfural content maximization under isothermal autohydrolysis. A variation range, involving tow independent variables at three different levels, was established for each process variable (viz. temperature and autohydrolysis time). The obtained models reproduced the experimental results of the dependent variables with errors below 6%. Under optimum experimental conditions, the yield of furfural (4.4 g/100 g raw material) could be obtained at 60 minutes and 220ºC).
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