从糠醛渣中提取纤维素的工艺

以甲酸和过氧化氢作溶剂，采用Milox三段法提取糠醛渣中的纤维素，将蒸煮与碱性过氧化氢漂白过程相结合，实现了木质素和纤维素分离的无氯漂白工艺，考察了甲酸用量、过氧化氢用量、提取温度和提取时间对糠醛渣中纤维素提取效果的影响。实验结果表明：当甲酸用量为80 mL，过氧化氢用量为14 mL，三段反应温度和时间分别为80 ℃反应2.5 h、95 ℃反应2.5h以及抽滤后加入新鲜溶剂在80 ℃再反应2.5 h，糠醛渣纤维素的得率是41.92%，纤维素的含量为85.09%，木质素含量为3.22%。由此可见该工艺优于其它工艺结果，能够更好地提高糠醛渣的应用价值。

Extraction of cellulose from furfural residue

Cellulose was extracted from furfural residue by the Milox three-stage method with formic acid and hydrogen peroxide as agents，which was combined with cooking and bleaching of alkaline hydrogen peroxide，and the totally chlorine-free bleaching process was accomplished in the separation of cellulose and lignin from furfural residue. The effects of formic acid dosage，hydrogen peroxide dosage，reaction temperature and time on the extraction efficiency were discussed. The results showed that when the appropriate dosage of formic acid and hydrogen peroxide were 80ml and 14ml respectively，the first-stage reaction at the temperature of 80 ℃ for 2.5 hours，the second-stage reaction at 95 ℃ for 2.5 hours and the third-stage reaction at also 80 ℃ for 2.5 hours after filtering and adding the new equal agents to the filtrate，the cellulose yield was 41.92%，the content of extracted cellulose was 85.09% and the lignin content was 3.22%. The results excels the others and the practical value of furfural residue may be more improved.