AI Article Synopsis
- The study explored how formaldehyde (FA) affects lignin during the pretreatment of corn stalks, utilizing a specific chemical mixture.
- It was found that FA prevents the condensation of lignin, allowing it to remain in smaller, soluble fragments instead of forming larger complexes.
- The findings indicated that the addition of FA and the type of solvent used significantly influence the structural characteristics of lignin and its breakdown products during the pretreatment process.
Article Abstract
This work investigated the role of formaldehyde (FA) in lignin anti-condensation during corn stalk pretreatment based on 1-butyl-3-methylimidazolium chloride ([CCim]Cl)/hydrochloric acid (HCl). As a result of the aldolization reactions between FA and lignin, the condensation of lignin fragments was inhibited, and lignin remained in soluble fragmental molecules. Characterizations on the compositional and structural changes of lignin and its degraded products during pretreatment (80 °C-100 °C, 2-5 h) with FA addition in comparison with those in DO/HCl/FA or [CCim]Cl/HCl were conducted. Results revealed that the structural features of lignin were affected by FA addition and solvent type. In the [CCim]Cl/HCl/FA system, FA stabilization was unfavorable for the cleavage of β-O-4' bonds and lignin with low S/G ratio (3.4) and high molecular weight (Mw = 9920 g·mol) was extracted. The compositions of degraded products were considerably affected by FA addition.
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| http://dx.doi.org/10.1016/j.biortech.2021.125064 | DOI Listing |
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