竹材在LiCl/DMSO溶剂体系中的溶解及再生性能

doi:10.11707/j.1001-7488.20200922

Abstract

Abstract:

Objective: The main purpose of this study was to investigate the characteristics of dissolution and regeneration of bamboo in LiCl/DMSO solvent system,and to provide a feasible solvent system for detailed elucidation of structural information of bamboo protolignin. Method: The analysis of general chemical composition was followed by national standard method. The contents of structural unit of lignin were conducted by alkaline nitrobenzene oxidation,the effects of dissolution and regeneration of bamboo on the cellulose crystallinity were investigated by X-ray diffraction. Result: Bamboo samples with 2 h ball milling could be dissolved in 6% LiCl/DMSO solvent system at a mass concentration of 7.5%,even 10% in the 8% LiCl/DMSO solvent system. The lignin yield was about 90%,the phenylpropane unit structure was found to be well preserved by nitrobenzene oxidation reaction after regeneration in water,the S unit was about 50%,while carbohydrate content was a little loss and the crystallinity was decreased from 58.7% to 26.5%. Conclusion: The effects of ball milled time and LiCl concentration in DMSO on dissolution of bamboo in LiCl/DMSO solvent system were showed. Regenerated ability of chemical composition was high. Compared with that of carbohydrate,lignin ability was higher. In addition,condensed degree of lignin unit was lower than that of rice straw,and both effects of ball milling and regeneration treatment on lignin structure were not found from alkaline nitrobenzene oxidation results,and the crystallinity of cellulose was destroyed by regeneration. The bio-structure and the chemical composition of bamboo were similar to those of wood,so its dissolution property was also close to that of wood. The LiCl/DMSO solvent system could be used to elucidation protolignin information of bamboo.

Key words: lignin, bamboo, LiCl/DMSO, dissolution and regeneration

CLC Number:

S781.4

Wenjuan Wu,Chunyang Zou,Lijing Huang,Yongcan Jin. Dissolution and Regeneration of Bamboo in LiCl/DMSO Solvent System[J]. Scientia Silvae Sinicae, 2020, 56(9): 201-206.

Figures/Tables 7

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References 0

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原料 Raw materials	木质素Lignin(%)			高聚糖Polysaccharide(%)					木质素得率 Lignin yield(%)	高聚糖得率 Sugar yield(%)
原料 Raw materials	酸不溶 Klason	酸溶 Acid soluble	总量 Total	葡聚糖 Glucan	木聚糖 Xylan	阿拉伯聚糖 Araban	其他 Others	总糖 Total	木质素得率 Lignin yield(%)	高聚糖得率 Sugar yield(%)
B	27.6	1.9	29.5	37.4	17.7	1.1	1.7	57.9	—	—
RB	24.9	1.9	26.8	32.3	14.5	0.8	1.7	49.3	90.8	85.2

原料 Raw materials	得率Yield/(mmol·g^-1)				H:V:S
原料 Raw materials	H	V	S	合计Total	H	V	S
B	0.5	0.8	1.2	2.5	19	31	50
RB	0.5	0.8	1.2	2.4	19	31	50

原料Raw materials	I₂₀₀	I₀₀₈	CrI(%)
B	7 315	3 020	58.7
RB	5 587	4 106	26.5

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Dissolution and Regeneration of Bamboo in LiCl/DMSO Solvent System

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