关键词: 糠醛渣, 纤维素, 提取, Milox法

Abstract: 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.

Key words: 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.