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| Effect of pH Value on Hydrolysis Performance of Corn Stover During Hydrothermal Pretreatment |
| Received:July 02, 2020 |
| DOI：10.11980/j.issn.0254-508X.2020.11.005 |
| Key Words:hydrothermal pretreatment corn stover hydrolysate pH value |
| Fund Project:天津市自然科学基金（重点项目）（16JCZDJC39700）。 |
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| Abstract:In this paper， acetic acid or sodium hydroxide was used to adjust the pH value of hydrothermal pretreatment， and the effect of pH value on the hydrolysis characteristics of corn stover was studied by analyzing the changes of cellulose， hemicellulose and lignin degradation products in hydrolysate. During the hydrothermal pretreatment process， the addition of acetic acid promoted the degradation of cellulose and hemicellulose， but the lignin dissolution rate decreased slightly， the content of xylose， xylooligosaccharide， glucose and other sugars in the hydrolysate increased， and the contents of furfural and 5-hydroxymethylfurfural increased rapidly. On the other hand， when the addition dosage of sodium hydroxide was less than 3%， the degradation of cellulose and hemicellulose decreased with the increase of sodium hydroxide dosage， and sodium hydroxide was mainly consumed in the removal of acetyl group from hemicellulose. When the dosage of sodium hydroxide was 3%， the pH value at the end of hydrothermal pretreatment was 5.84， and the yield of solid material reached the maximum value of 75.15%. With the further increase of NaOH dosage， the dissolution rate of lignin began to increase， and the yield of solid material decreased. The findings indicated that pH could be used as an important means to control the hydrothermal pretreatment process. |
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