Table 4.
Pyrolysis products of H lignin and P lignin (H: p-hydroxyphenyl type, G: guaiacyl type, S: syringyl type, C: catechol)

Peak no. H lignin P lignin
R.T. Compounds R.T. Compounds
1 4.8 Acetic acid 4.8 Acetic acid
2 5.4 Benzene 12.9 Furfural
3 9.4 Toluene 19 Phenol, -methyl- (H)
4 18.8 Phenol (H) 19.6 Phenol, -methoxy- (G)
5 19 Phenol, -methyl- (H) 21.3 Phenol, -methoxy-methyl- (G)
6 19.6 Phenol, -methoxy- (G) 22.4 Benzenediol, -methoxy- (C)
7 20.6 Phenol, -dimethyl- (H) 22.6 Phenol, -ethyl-methoxy- (G)
8 21.1 Phenol,-methoxy-methyl- (G) 22.9 Benzenediol, -methyl- (C)
9 21.3 Phenol, -methoxy-methyl- (G) 23.2 Methoxy-vinylphenol (G)
10 21.5 Benzenediol (C) 23.8 Phenol, -dimethoxy- (S)
11 21.9 Naphthalene 24.3 Phenol, -methoxy-(-propenyl)- (G)
12 22.4 Benzenediol, -methoxy- (C) 24.8 Benzoic acid, -hydroxy-methoxy- (G)
13 22.6 Phenol, -ethyl-methoxy- (G) 25 Phenol, -methoxy-(-propenyl)- (G)
14 22.9 Benzenediol, -methyl- (C) 25.8 Benzene, -trimethoxy-methyl-
15 23.2 Methoxy-vinylphenol (G) 26.6 Phenol, -dimethoxy-(-propenyl)- (S)
16 23.8 Phenol, -dimethoxy- (S) 27.4 Benzaldehyde, -hydroxy-dimethoxy- (S)
17 24.8 Benzaldehyde, -hydroxy-methoxy- (G) 27.8 Phenol, -dimethoxy-(-propenyl)- (S)
18 24.9 Hydroxy-methoxybenzoic acid (G) 28.2 Ethanone, -(-hydroxy-dimethoxyphenyl)- (S)
19 25 Phenol, -methoxy-(-propenyl)- (G) 28.6 Butanone, -(-trihydroxy-methylphenyl)- (S)
20 25.8 Ethanone, -(-dihydroxy-methoxyphenyl)- (G) 30.3 Hexadecanoic acid
21 26.3 Methyl-dimethoxybenzaldehyde (S) 30.8 Dimethoxy-hydroxycinnamaldehyde (S)
22 26.6 Phenol, -dimethoxy-(propenyl)- (S) 31.9 Octadecadienoic acid
23 28.2 Ethanone, -(-hydroxy-dimethoxyphenyl)- (S)
24 31.9 Octadecenoic acid