Recent Development in Chemical Depolymerization of Lignin: A Review

Table 4

Ionic liquids-assisted lignin depolymerization.

Lignin	Ionic liquid	Reaction conditions		Major products	Yield	Reference
		𝑇 (°C)	𝑃 (MPa)		wt.%
Organosolv beech lignin		100	8.4	2,6-Dimethoxy-1,4-benzoquinone	11.5	[30]
Eugenol		200		Guaiacol	7.9	[31]
Oak wood lignin		110–150		Alkyl-aryl ether linkages cleavage	—	[32]
Guaiacylglycerol-β-guaiacyl ether		150		Guaiacol	71.5	[33]
Veratrylglycerol-β-guaiacyl ether		150		Guaiacol	70	[33]
Guaiacylglycerol-β-guaiacyl ether		150		β-O-4 Ether bond cleavage	—	[34]
Guaiacylglycerol-β-guaiacyl ether		150		Guaiacol	75	[35]