碳酸钠催化氯化胆碱/乳酸低共熔溶剂改性碱木质素及其表征

doi:10.3969/j.issn.0253-2417.2023.01.011

Abstract

Abstract:

The deep eutectic solvents(DES) were synthesized by choline chloride(ChCl) and lactic acid(Lac), urea(U), oxalic acid(OA) and formic acid(FA), respectively. The industrial alkali lignin(AL) was modified by these DESs. The effects of different DES systems, reaction conditions and catalysts on the extraction yield of the modified alkali lignin were studied. It was found that the extraction yield of lignin was the highest when ChCl/Lac was used. The optimal conditions of ChCl/Lac modification were obtained by single factor test. And the optimal conditions were 120 ℃, the mole ratio of Lac to ChCl(n_Lac/n_ChCl) 12 ∶ 1, mass ratio of DES to alkali lignin (m_DES/m_AL) 20 and reaction time 12 h, under these conditions, the extraction yield of lignin was 95.37%. When the reaction temperature was reduced to 100 ℃, the lignin extraction yield was 40.39% without catalyst. While 8% sodium carbonate was used as catalyst, the lignin extraction yield increased to 74.87%. The lignin samples were characterized by FT-IR, ¹³C NMR, TG and DTG. The results of FT-IR and ¹³C NMR showed that β-O-4 bond was broken and hydroxymethyl and methoxyl groups were introduced during modification, and the modified lignin was mainly composed of syringyl unit. From TG and DTG results, the exothermic peak of lignin moved to high temperature after sodium carbonate catalytic modification, and the thermal stability was improved.

Key words: deep eutectic solvent, choline chloride/lactic acid, alkali lignin, modification, catalysis

CLC Number:

TQ35
TS721

Qingye LIU, Xianyun CHEN, Hua DENG, Weixing GAN, Siyu HUANG, Mianwu MENG. Modification and Characterization of Alkali Lignin by Choline-chloride/Lactic Acid Deep Eutectic Solvents Catalyzed by Sodium Carbonate[J]. Chemistry and Industry of Forest Products, 2023, 43(1): 89-96.

Figures/Tables 8

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References 31

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序号 No.	DES体系 DES system	改性木质素质量/g mass of modified lignin	木质素提取率/% lignin extraction rate
1	ChCl/Lac	1.41	95.37
2	ChCl/U	0.42	5.74
3	ChCl/OA	0.51	13.36
4	ChCl/FA	0.89	35.76

序号 No.	反应体系 reaction system	改性木质素质量/g mass of modified lignin	木质素提取率/% lignin extraction rate
1	1%H₂O₂(pH 11.5)+DES	0.42	21.26
2	1%H₂SO₄+DES	0.57	37.68
3	1%HCl+DES	0.61	30.02
4	1%KOH+DES	0.52	37.69
5	1%NaOH+DES	0.61	24.47
6	1%Na₂CO₃+DES	0.70	50.04
7	DES	1.16	40.39

序号 No.	反应体系 reaction system	改性木质素质量/g mass of modified lignin	木质素提取率/% lignin extraction rate
1	1%Na₂CO₃+ChCl/Lac	0.70	50.04
2	4%Na₂CO₃+ChCl/Lac	0.68	54.63
3	5%Na₂CO₃+ChCl/Lac	0.71	46.84
4	6%Na₂CO₃+ChCl/Lac	0.85	32.03
5	7%Na₂CO₃+ChCl/Lac	0.95	37.67
6	8%Na₂CO₃+ChCl/Lac	0.72	74.87
7	9%Na₂CO₃+ChCl/Lac	0.63	49.35
8	12%Na₂CO₃+ChCl/Lac	0.52	37.17
9	Na₂CO₃	0.23	2.26
10	ChCl/Lac	1.16	40.39

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Modification and Characterization of Alkali Lignin by Choline-chloride/Lactic Acid Deep Eutectic Solvents Catalyzed by Sodium Carbonate

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