Acid-treatment of C5 and C6 sugar monomers/oligomers: Insight into their interactions

作者：Hu Xun; Wang Shuai; Wu Liping; Dong Dehua; Hasan Md Mahmudul; Li Chun Zhu^*

来源：Fuel Processing Technology, 2014, 126: 315-323.

DOI：10.1016/j.fuproc.2014.05.024

• Acid-catalyzed conversion
• Sugars
• Cross-polymerization
• Polymer
• Levulinic acid

Carbohydrates are the intermediates/products during hydrolysis of biomass, which can be converted to value-added chemicals/biofuels via further acid-catalysis. The interactions between the typical carbohydrates/furans including glucose, fructose, raffinose, xylose, and furfural during their acid-catalyzed conversion in water/dimethyl sufoxide were investigated in this study. The insoluble polymer formed from the carbohydrates was measured and characterized with FT-IR, while the soluble polymers were characterized with a UV-fluorescence spectrometer. The interaction or cross-polymerization of xylose/glucose, fructose/raffinose, furfural/glucose, and furfural/fructose does exist, producing more soluble polymer but not significantly more insoluble polymer. The insoluble polymer deactivates the solid acid catalyst, slowing down conversion of sugars/intermediates. In addition, different sugars have very different propensities towards polymerization in water, which follows the order: fructose similar to raffinose %26lt; glucose %26lt; xylose %26lt; furfural. In addition, the acid-treatment of glucose in DMSO and in water produces the similar amount of insoluble polymer, while the insoluble polymer formed in the add-treatment of xylose is less in DMSO than in water at the experimental conditions employed.

• 出版日期2014-10