Optimization of Hydrothermal and Diluted Acid Pretreatments of Tunisian Luffa cylindrica (L.) Fibers for 2G Bioethanol Production through the Cubic Central Composite Experimental Design CCD: Response Surface Methodology

Figure 4

Responses surfaces of temperature-reaction time (a); [H₂SO₄]-temperature (b); [H₂SO₄]-reaction time (c); interaction effects on the variation Δ of total sugars concentration for CCD.

(a) [H₂SO₄] = 2.75%

(b) Reaction time = 45 min

(c) Temperature = 100°C