Table 5. Predicted conditions for process optimization and their experimental validation.

Pretreatment conditions

Predicted conditions

Acid concentration (% vv)

1.09

S:L ratio (g:ml)

1:2.8

Time of exposition (min)

27

Response variables for the hydrolysis process

Predicted values

Experimental values

Xylose concentration (g/l)

54.61 ± 4.20

50.13

Hydrolysis yield (%)

66.40 ± 4.84

60.24

Acetic acid concentration (g/l)

5.65 ± 0.64

6.04

Furfural concentration (g/l)

0.48 ± 0.02

0.55

Hydroxymethylfurfural concentration (g/l)

0.05 ± 0.01

0.09

Phenolic compounds concentration (g/l)

1.92 ± 0.39

1.18