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Official Journal of the Japan Wood Research Society

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