Cellulose extraction from wood chip in an ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl)

• Published in: Bioresource technology Vol. 102; no. 17; pp. 7959 - 7965
• Main Authors: Wang, Xuejing, Li, Huiquan, Cao, Yan, Tang, Qing
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.09.2011; Elsevier
• Subjects: Agronomy. Soil science and plant productions; Allyl Compounds - chemistry; Biological and medical sciences; Catalpa; Cellulose; Cellulose - isolation & purification; Chlorides; dimethyl sulfoxide; Dissolution; Extraction; Fourier transform infrared spectroscopy; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; hydrogen bonding; Imidazoles - chemistry; Ionic liquid; Ionic liquids; irradiation; Magnetic Resonance Spectroscopy; microscopy; Microwaves; nuclear magnetic resonance spectroscopy; Pine; Pinus; Spectroscopy, Fourier Transform Infrared; Temperature; Use of agricultural and forest wastes. Biomass use, bioconversion; Wood; Wood - chemistry; Wood chip; Wood chips; Wood chip; Extraction; Dissolution; Cellulose; Ionic liquid; Chlorides; Allylic compound
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2011.05.064

[Display omitted] ► Cellulose can be effectively extracted from pine in AmimCl. The purity of the pine cellulose can reach as high as 85%. The reaction time is significantly reduced by microwave irradiation. IL dissolves pine by destroying inter and intramolecular hydrogen bonds. IL could be easily recycled and reused after extraction. In the present study, 1-allyl-3-methylimidazolium chloride (AmimCl), an ionic liquid (IL), was used to extract cellulose from pine, poplar, Chinese parasol, and catalpa wood chips. Results show that pine is the most suitable wood species for cellulose extraction with ILs. Its cellulose extraction rate can reach as high as 62% under optimized conditions and its cellulose content is as high as 85% when DMSO/water is used as the precipitant. The dissolution process can be clearly observed by hot stage optical microscopy, and the reaction time can be significantly reduced by microwave irradiation. 13C CP/MAS NMR, FTIR, XRD, and SEM were used to analyze the cellulose-rich extracts of pine. Results show that IL dissolves pine wood by destroying inter and intramolecular hydrogen bonds between lignocelluloses. The major component of pine extract is cellulose with a homogeneous and dense structure. After extraction, AmimCl can be easily recycled and reused.