Figure 4: Predicted 3dimentional changes of xylose concentration at different acid concentrations. (a) 1% (w/v) H_{2}SO_{4} and 0.4% (w/v) H_{3}PO_{4}; (b) 2% (w/v) H_{2}SO_{4} and 0.8% (w/v) H_{3}PO_{4}; (c) 2.5% (w/v) H_{2}SO_{4} and 1% (w/v) H_{3}PO_{4}; (d) 3% (w/v) H_{2}SO_{4} and 1.2% (w/v) H_{3}PO_{4}. Other assumed conditions: liquid to solid ratio 3 mL/g, 100–180°C. 
