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Official Journal of the Japan Wood Research Society

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Table 1 Relative amounts of the effluents condensated by VOCs of rubberwood from different heat-treatment stages

From: Characterization of the effluents condensated by volatile organic compounds during heat-treated rubberwood process

Groups Rt/min Compounds 215 ℃
3 h
215 ℃
1 h
185 ℃
3 h
185 ℃
1 h
175 ℃
1 h
145 ℃
1 h
125 ℃
1 h
Aldehydes 3.061 3-Furaldehyde 0.33
4.091 5-Methyl-2-furancarboxaldehyde 0.05 1.56 1.53 1.86 4.41 3.72
4.603 1H-Pyrrole-2-carboxaldehyde 0.17 0.78 1.20 6.65 7.92
5.507 1-Methyl-1H-pyrrole-2-carboxaldehyde 0.68
6.506 5-Hydroxy methyl furfural 2.22 1.03
7.512 Vanillin 7.26 12.06 10.56 22.56 36.23 5.45
7.606 3-Hydroxy-4-methoxy benzaldehyde 5.93
9.655 4-Hydroxy-3,5-dimethoxy benzaldehyde 8.37 6.89 5.81 5.50 5.72 4.23 7.30
10.689 Coniferyl aldehyde 6.28 9.37 25.68 20.25 11.22 3.44 4.18
14.374 3,5-Dimethoxy-4-hydroxycinnamaldehyde 3.07 5.49 9.25 6.19 2.11
Total   27.42 30.6 55.11 45.56 53.35 55.54 16.93
Ethers 3.587 Methyl acetoxy acetate 0.12 0.13
4.272 4-Oxo-pentanoic acid methyl ester 0.14 0.16
8.309 4-Hydroxy-3-methoxy benzoic acid methyl ester 3.42 0.30
9.033 6-Methoxy eugenyl isovalerate 5.06
Total   3.68 5.35 0.30
Ketones 3.646 1-(2-Furanyl)-ethanone 0.02 0.06
3.795 2-Hydroxy-2-cyclopenten-1-one 0.48
3.684 2-(5H)-Furanone 0.40 0.49 0.54 1.13 1.83
3.813 1,2-Cyclopentanedione 0.42 0.45 0.17
4.241 5-Methyl-(E)-2-hepten-4-one 0.04
4.436 2,5-Piperazinedione 2.62 0.32
4.446 1,1-Di(isobutyl)acetone 2.31
4.665 2-Hydroxy-3-methyl-2-cyclopenten-1-one 0.57 0.78 0.45
4.968 1-(1H-pyrrol-2-yl)-ethanone 1.41 1.83
5.128 3-methyl-3-hepten-2-one 0.16
6.652 3,4-Dihydroxyacetophenone 1.92 1.97
6.666 1-(2,5-Dihydroxyphenyl)-ethanone 1.04 0.43
6.875 4-Hydroxy-2-methylacetophenone 0.28 0.39
7.345 2,5-Dihydroxy propiophenone 1.24 0.87
8.114 Apocynin 1.35 1.05 1.06 1.29 1.55
8.149 1-(3-Hydroxy-4-methoxyphenyl)-ethanone 2.08 1.76
8.420 1-(4-Hydroxy-3-methoxyphenyl)-2-propanone 6.35 5.89 2.31 1.34 1.69 2.62
8.671 1-(3,4-Dimethoxyphenyl)-ethanone 1.63 1.47 0.28
8.653 3′,5′-Dimethoxyacetophenone 0.17
8.921 Butyro vanillone 2.52 1.88 2.10 3.50
Total   18.36 13.81 10.14 5.83 9.41 6.62 4.17
Acids 3.670 4-Hydroxy-butanoic acid 1.72 3.01
3.228 Methylenecyclopropane carboxylic acid 2.28 4.40 11.41
Total   2.28 4.40 11.41 1.72 3.01
Alcohols 3.204 3-Furanmethanol 24.37 20.62 17.33
4.711 5-Methyl-2-furanmethanol 2.25
5.960 Creosol 0.69 0.71 0.28
7.769 3,5-Dimethoxy-4-hydroxytoluene 6.37 0.94
11.914 trans-Sinapyl alcohol 0.17
Total   7.06 3.13 0.94 24.37 20.90 17.33
Phenols 4.982 2-Methyl phenol 0.14 0.16
5.198 2-Methoxy-phenol 2.55 3.55
5.382 Maltol 2.22 1.26 1.94 1.62 2.53
6.266 Catechol 3.55 5.14 6.31 4.86
6.750 3-Methyl-1,2-benzenediol 0.54 0.97
6.617 2-Acetyl resorcinol 0.20 0.71
6.889 2-Methoxy-4-vinylphenol 0.18
7.129 2,6-Dimethoxy phenol 0.64 2.75 7.76 4.75 6.21 4.75 7.33
7.769 Eugenol 0.51
7.926 2-Methoxy-4-propyl phenol 0.77
8.291 5-tert-Butylpyrogallol 2.03
8.782 4-(1-Hydroxyallyl)-2-methoxyphenol 0.47 0.84 0.24 0.45
8.945 2,6-Dimethoxy-4-(2-propenyl)-phenol 2.19 4.01
10.042 (E)-2,6-Dimethoxy-4-(prop-1-en-1-yl)phenol 12.77 9.31 0.54 24.51
12.296 2,5-Bis(1,1-dimethylethyl)-1,4-benzenediol 0.33 0.25 3.25
Total   26.37 24.23 16.43 11.77 9.90 4.75 41.64
Alkanes 4.248 2,2,4,6,6-Pentamethyl-heptane 1.85 0.60
4.251 4-(1-Methylethyl)-heptane 0.21
4.418 2,2-Diethyl-3-methyl- oxazolidine 1.02 1.24
Total   1.23 1.24 1.85 0.60
Anhydride 5.295 2-Methyl-propanoic acid anhydride 0.31
Aromatics 7.727 1,2,4-Trimethoxy benzene 0.77
8.354 1,2,3-Trimethoxy-5-methyl benzene 3.89 2.25
Total   3.89 2.25 0.77