氯化胆碱/1, 4-丁二醇/AlCl3三元低共熔体系提高毛竹预处理效率的研究

doi:10.3969/j.issn.0253-2417.2023.03.013

Abstract

Abstract:

Bamboo was pretreated by choline chloride(ChCl)/1, 4-butanediol(BDO)/AlCl₃ deep eutectic solvent(DES) system with a solid to liquid ratio of 1∶4(g∶g) at 90-130 ℃. The effects of DES reaction system with high loading capacity of lignocellulose on chemical composition, enzymatic hydrolysis efficiency, and lignin recovery of moso bamboo were investigated at different temperatures. The results of the research showed that the mass fractions of xylan and lignin in the pretreated substrates decreased gradually with the increase of pretreatment temperature, while the mass fraction of glucan increased, and the enzymatic hydrolysis efficiency increased significantly. When conducting pretreatment at the optimal condition of 110 ℃, the recovery rate of pretreated substrates was 59.24%, and the recovery rate of glucan and xylan were 91.38% and 27.03%, respectively. The lignin removal ratio was 69.72%, and the glucan enzymatic hydrolysis yield reached almost 100%, indicating that the ChCl/BDO/AlCl₃ ternary DES system could greatly improve the pretreatment efficiency of moso bamboo. Further research showed that more than 90% lignin in the pretreatment liquid could be recovered by sequential organic solvent dissolution and reprecipitation, and the purity of the recovered lignin had high value of 99.26%. From the mass balance, it was found that each component of moso bamboo could be separated and transformed effectively.

Key words: high raw material loading capacity, deep eutectic solvent, enzymatic hydrolysis, lignin

CLC Number:

TQ35

Xuze LIU, Yunni ZHAN, Mengke ZHAO, Chen HUANG, Yongjun DENG, Guigan FANG. Improving Pretreatment Efficiency of Moso Bamboo with Ternary Deep Eutectic Solvent of Choline Chloride/1, 4-Butanediol/AlCl₃[J]. Chemistry and Industry of Forest Products, 2023, 43(3): 108-114.

Figures/Tables 5

Table 1

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Table 2

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References 21

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温度/℃temperature	物料得率/% solid recovery rate	葡聚糖/% glucan	木聚糖/% xylan	木质素/% lignin	灰分% ash
未处理untreated	100.00	41.00	12.21	29.00	1.87
90	82.10	48.30	10.04	25.43	1.66
100	71.19	54.75	7.63	21.02	1.76
110	59.24	63.24	5.57	14.82	2.23
120	56.91	63.41	4.15	13.16	1.96
130	59.39	59.33	0.37	21.25	2.05
120(ChCl/H₂O/AlCl₃)	72.55	54.19	0.75	31.38	—
120(ChCl/BDO)	98.04	41.22	11.22	28.36	—

温度/℃ temperature	木质素回收率/% lignin recovery yield	葡聚糖/% glucan	木聚糖/% xylan	灰分% ash
90	92.44	0	0.09	0.62
100	98.88	0	0.15	0.50
110	97.11	0	0	0.74
120	90.09	0	0	0.31
130	93.20	0	0	0.55

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Improving Pretreatment Efficiency of Moso Bamboo with Ternary Deep Eutectic Solvent of Choline Chloride/1, 4-Butanediol/AlCl₃

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Improving Pretreatment Efficiency of Moso Bamboo with Ternary Deep Eutectic Solvent of Choline Chloride/1, 4-Butanediol/AlCl3

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Improving Pretreatment Efficiency of Moso Bamboo with Ternary Deep Eutectic Solvent of Choline Chloride/1, 4-Butanediol/AlCl₃