Study on the Preparation and Application of Lignin-Derived Polycarboxylic Acids

Table 1

The determination result of the content of functional groups of lignin.

	Acid-precipitated lignin (%)	LPCAs (%)
-COOH	9.02 ± 0.03	11.10 ± 0.03
-OH (aliphatic)	0.19 ± 0.03	N/A
-OH (phenolic)	4.23	1.50
-OCH3	8.32 ± 0.03	4.90 ± 0.03