Lignocellulose Separation and Utilization Based on Choline Chloride Eutectic Solvents: A Review

doi:10.11924/j.issn.1000-6850.casb2022-0835

Abstract

Abstract:

In order to remove the inherent complex resistance structure of lignocellulose and achieve efficient utilization of lignocellulose, new lignocellulosic pretreatment technologies have been improved continuously. As green solvents, Deep Eutectic Solvents (DESs) have the advantages of low cost, simple preparation, thermal stability, and designability. They have great application potential in promoting the pretreatment of lignocellulose and enzymatic hydrolysis, and have received widespread attention. Based on the analysis and summary of the research status and achievements at home and abroad, the research progress of synthesis and properties of DESs, pretreatment mechanism, enzymatic hydrolysis, and bioethanol conversion were discussed. It was pointed out that different hydrogen bond donors and different pre-treatment conditions had a significant impact on the lignin removal rate and glucose yield. It was believed that pretreatment of lignocellulose with DESs could greatly improve the saccharification rate. Prospects for DESs pretreatment mechanism, recycling, and process parameter optimization were proposed.

Key words: deep eutectic solvents, lignocellulose, enzymolysis, bioethanol

LIU Jing, WANG Changmei, ZHAO Xingling, WU Kai, YIN Fang, YANG Hong, YANG Bin, LIANG Chengyue, ZHANG Wudi. Lignocellulose Separation and Utilization Based on Choline Chloride Eutectic Solvents: A Review[J]. Chinese Agricultural Science Bulletin, 2023, 39(33): 156-164.

Figures/Tables 3

References 78

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DESs	熔点/℃	黏度/Pa.S	密度/(g/cm³)	表面张力/(mN/N)	电导率/(S/m)	参考文献
ChCl/尿素(1:2)	12	0.75（25℃）	1.25	52.00	0.075（25℃）	[37]
ChCl/丙三醇(1:2)	-36.15	0.26（25℃）	1.18	--	0.105（25℃）	[37]
ChCl/乙二醇(1:2)	-66.01	0.037（25℃）	1.12	48.91	0.761（25℃）	[38]
ChCl/1,4-丁二醇(1:3)	-32	0.14（25℃）	1.06	47.17	0.164（25℃）	[38]
ChCl/草酸(1:1)	34	--	--	--	--	[16]
ChCl/苹果酸(1:1)	--	3.34（25℃）	--	65.68	0.0036	[39,40]
ChCl/乙酰苯 (1:2)	--	--	--	41.86	--	[40]

DESs	熔点/℃	黏度/Pa.S	密度/(g/cm³)	表面张力/(mN/N)	电导率/(S/m)	参考文献
ChCl/尿素(1:2)	12	0.75（25℃）	1.25	52.00	0.075（25℃）	[37]
ChCl/丙三醇(1:2)	-36.15	0.26（25℃）	1.18	--	0.105（25℃）	[37]
ChCl/乙二醇(1:2)	-66.01	0.037（25℃）	1.12	48.91	0.761（25℃）	[38]
ChCl/1,4-丁二醇(1:3)	-32	0.14（25℃）	1.06	47.17	0.164（25℃）	[38]
ChCl/草酸(1:1)	34	--	--	--	--	[16]
ChCl/苹果酸(1:1)	--	3.34（25℃）	--	65.68	0.0036	[39,40]
ChCl/乙酰苯 (1:2)	--	--	--	41.86	--	[40]

DESs	摩尔比	木质素溶解度/%	木聚糖溶解度/%	纤维素溶解度/%	参考文献
ChCl/甲酸	1:2	14	<1	<1	[45]
ChCl/乳酸	1:10	13	<5	<3
ChCl/乙酸	1:2	12	<1	<1
甜菜碱/乳酸	1:2	9	<1	<1
脯氨酸/乳酸	1:3.3	9	<1	<1

DESs	摩尔比	木质素溶解度/%	木聚糖溶解度/%	纤维素溶解度/%	参考文献
ChCl/甲酸	1:2	14	<1	<1	[45]
ChCl/乳酸	1:10	13	<5	<3
ChCl/乙酸	1:2	12	<1	<1
甜菜碱/乳酸	1:2	9	<1	<1
脯氨酸/乳酸	1:3.3	9	<1	<1

原料	DESs	摩尔比	预处理条件	木质素去除率/%	参考文献
小麦秸秆	ChCl/单乙醇胺	1:2	90 ℃，12 h	81.0	[59]
小麦秸秆	ChCl/二乙醇胺	1:8	90 ℃，12 h	73.5
小麦秸秆	ChCl/甲基二乙醇胺	1:10	90 ℃，12 h	44.6
小麦秸秆	ChCl/乙酰胺	1:2	90 ℃，12 h	3.4
小麦秸秆	ChCl/尿素	1:2	70 ℃，12 h	76.4
小麦秸秆	ChCl/单乙醇胺	1:6	110 ℃，12 h	87.7
玉米芯	ChCl/尿素	1:2	80 ℃，15 h	40.0	[50]
玉米芯	ChCl/咪唑	3:7	115 ℃，15 h	70.0
玉米芯	ChCl/咪唑	3:7	150 ℃，15 h	88.0
玉米芯	ChCl/咪唑	3:7	120 ℃，4 h	11.1
核桃壳	ChCl/乳酸	1:2	145 ℃，6 h	64.3	[60]
桃核	ChCl/乳酸	1:2	145 ℃，6 h	70.2	[60]
油棕空果壳	ChCl/苹果酸	1:1	120 ℃，8 h	22.9	[58]
油棕空果壳	ChCl/柠檬酸	1:1	120 ℃，8 h	20.6
油棕空果壳	ChCl/甲酸	1:2	120 ℃，8 h	61.9
油棕空果壳	ChCl/甲酸	1:5	120 ℃，8 h	25.0
油棕空果壳	ChCl/乙酸	1:2	120 ℃，8 h	28.0
油棕空果壳	ChCl/乙酸	1:5	120 ℃，8 h	40.0
油棕空果壳	ChCl/丙酸	1:2	120 ℃，8 h	20.4
油棕空果壳	ChCl/丁酸	1:2	120 ℃，8 h	14.3
油棕空果壳	ChCl/琥珀酸	2:1	120 ℃，8 h	10.7
玉米芯	ChCl/乙二醇	1:2	90 ℃，24 h	87.6	[11]
玉米芯	ChCl/丙三醇	1:2	90 ℃，24 h	71.3	[11]
玉米芯	ChCl/丙三醇/聚乙二醇	1:2:1	60 ℃，2 h	62.9	[61]
稻草	ChCl/乙二醇	1:1	120 ℃，3 h	28.7	[55]
稻草	ChCl/1,2-丙二醇	1:1	120 ℃，3 h	32.9
稻草	ChCl/1,3-丙二醇	1:1	120 ℃，3 h	34.2
杨木	ChCl/乳酸	1:2	170 ℃，4 h	49.2	[62]