不同溶剂辅助碱性过氧化氢脱除木质素的研究

doi:10.3969/j.issn.0253-2417.2023.04.011

Abstract

Abstract:

In order to explore the effect of delignification under different organic solvent-assisted alkaline hydrogen peroxide treatment, the composition changes of poplar mechanical pulp after lignin removal by ethanol alkaline hydrogen peroxide(EAHP) and dioxane alkaline hydrogen peroxide(DAHP) were investigated using the alkaline hydrogen peroxide system(AHP) as a reference. The chemical structure, molecular weight, and hydroxyl content of alkali lignin(AL) and alkaline hydrogen peroxide lignin(AHPL), ethanol alkaline hydrogen peroxide lignin(EAHPL) and dioxane alkaline hydrogen peroxide lignin(DAHPL) were characterized by high-performance liquid chromatography(HPLC), Fourier transforms infrared spectroscopy(FT-IR), gel-permeation chromatography(GPC), and ³¹P nuclear magnetic resonance(³¹P NMR). The results showed that the three reaction systems led to the varying degradation degrees of the material yield and the dissolution of a large number of hemicellulose. Compared with AHP and DAHP, EAHP was more conducive to preserve cellulose and dissolve more lignin, and the highest lignin removal rate reached 65%. Compared with AL, AHP, EAHPL and DAHPL possessed basically the same infrared spectral peak type, both belonging to G-S type. The minimum M_n of the prepared lignin was 4 672 g/mol with low polydispersity and low phenolic hydroxyl content, while it had higher aliphatic hydroxyl group and carboxylic acid hydroxyl group contents, with the highest contents of 14.95 and 1.25 mmol/g, respectively.

Key words: alkaline hydrogen peroxide, delignification, organic solvent

CLC Number:

TQ35

Beiping ZHU, Jian JIAO, fangmin LIANG, Yongjun DENG, Guigan FANG. Delignification by Alkaline Hydrogen Peroxide Assisted with Different Solvents[J]. Chemistry and Industry of Forest Products, 2023, 43(4): 74-80.

Figures/Tables 5

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Table 1

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Table 2

References 23

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样品 sample	酶解前before enzymolysis		酶解后after enzymolysis
样品 sample	葡萄糖/% glucose	木聚糖/% xylan	M_n/(g·mol^-1)	M_w/(g·mol^-1)	M_w/M_n	葡萄糖/% glucose	木聚糖/% xylan
AHPL	3.45	7.20	6 936	13 307	1.92	0.12	—
EAHPL	0.03	5.89	4 672	6 663	1.43	0.10	0.20
DAHPL	4.65	3.96	5 976	8 533	1.43	0.11	0.25

基团 group	化学位移(δ) chemical shift	不同样品中羟基的量content of OH groups in different samples/(mmol·g^-1)
基团 group	化学位移(δ) chemical shift	AL ^[23]	AHPL	EAHPL	DAHPL
脂肪族羟基aliphatic OH	145.5-150.5	0.48	14.95	14.93	13.76
S型结构羟基5-substituted OH	140.0-144.7	2.46	0.78	0.70	0.71
G型结构羟基guaiacyl OH	138.2-140.0	0.65	0.40	0.41	0.44
H型结构羟基p-hydroxyphenyl OH	137.3-138.2	0.06	0.28	0.21	0.37
羧基羟基carboxylic acid OH	133.6-136.6	0.07	1.25	1.25	1.17
酚羟基phenolic OH	137.3-144.7	3.17	1.47	1.32	1.52

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Delignification by Alkaline Hydrogen Peroxide Assisted with Different Solvents

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