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Official Journal of the Japan Wood Research Society

Table 2 Elemental composition of hydrochars produced by hydrothermal carbonization of kraft lignin

From: Feature importance measures from random forest regressor using near-infrared spectra for predicting carbonization characteristics of kraft lignin-derived hydrochar

Sample

Elemental composition (wt%)

O/C

H/C

Temp (℃)

Time (h)

C

H

Oa

N

S

Control

62.83

5.79

29.25

0.39

1.74

0.35

1.10

150

1

65.07

5.65

28.02

0.31

0.95

0.32

1.03

 

2

65.68

5.68

27.34

0.33

0.97

0.31

1.03

 

3

65.38

5.65

27.48

0.31

1.18

0.32

1.03

 

5

65.46

5.66

27.50

0.32

1.07

0.32

1.03

175

1

65.36

5.66

27.23

0.46

1.29

0.31

1.03

 

2

65.76

5.65

26.95

0.40

1.24

0.31

1.02

 

3

65.73

5.64

27.02

0.41

1.20

0.31

1.02

 

5

65.82

5.63

26.93

0.41

1.21

0.31

1.02

200

1

65.73

5.52

27.06

0.41

1.28

0.31

1.00

 

2

66.19

5.46

26.51

0.43

1.41

0.30

0.98

 

3

66.25

5.55

26.53

0.42

1.24

0.30

1.00

 

5

67.02

5.58

25.73

0.43

1.23

0.29

0.99

225

1

67.24

5.58

25.62

0.43

1.13

0.29

0.99

 

2

67.43

5.58

25.44

0.42

1.13

0.28

0.99

 

3

67.44

5.48

25.56

0.41

1.11

0.28

0.97

 

5

68.11

5.51

24.82

0.43

1.12

0.27

0.96

250

1

68.23

5.48

24.73

0.45

1.12

0.27

0.96

 

2

68.64

5.54

24.43

0.47

0.92

0.27

0.96

 

3

69.12

5.47

24.00

0.49

0.92

0.26

0.94

 

5

69.37

5.38

23.88

0.49

0.87

0.26

0.92

  1. aO (wt%) = 100 – (C + H + N + S) (wt%)