Recent Development in Chemical Depolymerization of Lignin: A Review

Table 2

Acid-catalyzed lignin depolymerization.

Lignin	Acid catalyst; alcohol/aqueous solution	Reaction conditions		Major products	Yield	Reference
		𝑇 (°C)	𝑃 (MPa)		wt.%
Wheat straw lignin	10 wt.% formic acid			Methoxyphenols	1.3	[20]
	77 wt.% ethanol	360	25	Catechols	0.5
				Phenols	0.3
Wheat straw lignin	10 wt.% formic acid			Methoxyphenols	2.0	[21]
	77 wt.% ethanol	380	25	Catechols	1.7
				Phenols	1.5
Wheat straw lignin	10 wt.% formic acid			Methoxyphenols	2.9	[21]
	81 wt.% ethanol	380	25	Catechols	1.5
				Phenols	2.0