| In this study, the pH of the hydrolysate and the yield of bamboo in oxalic acid pretreatment of bamboo chips with various oxalic acid concentration were investigated and the relationship between pH of hydrolysate and bamboo yield were explored. pH and yield would reach to a level-off value in the course of hot water treatment, while the higher temperature was favored to a level-off value in short time. pH of hydrolysate was almost stable with the addition of 1% oxalic acid, whereas the yield of bamboo decreased. When the oxalic acid amount exceeded 3%, pH increased and yield decreased gradually, furthermore both of them tended to be level-off. The final values were depended on the initial oxalic acid addition. The higher of oxalic acid addition, the lower of both level-off values. pH and yield bad good linear relationship in hot water treatment, its slope was more or less independent on temperature. Similarly, pH and yield also had linear relationship when oxalic acid was added, its slope was related to oxalic acid addition, the higher of oxalic acid addition, the lower of the slope. |
