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Table 3 Effect of EA and sulfidity on yield, chemical composition of kraft pulps from pretreated bamboo chips

From: A biorefinery scheme to fractionate bamboo into high-grade dissolving pulp and ethanol

Alkaline-pretreated samples

EA (%)

Sulfidity (%)

Total yielda,c (%)

Rejectsa,c (%)

Celluloseb,c (%)

Hemicelluloseb,c (%)

Ligninb,c (%)

Ashb,c (%)

Silica in pulpb,c (%)

Cooking at 160 °C

18

0

51.8

0.2

80.26 ± 0.35

14.58 ± 0.14

3.56 ± 0.13

0.14 ± 0.01

≈0.01

10

50.6

0.1

83.28 ± 0.35

13.94 ± 0.32

2.90 ± 0.12

0.12 ± 0.01

ND

25

49.3

ND

84.30 ± 0.46

13.85 ± 0.41

2.47 ± 0.08

0.08 ± 0.01

ND

40

48.6

ND

85.02 ± 0.43

13.42 ± 0.25

2.07 ± 0.11

0.11 ± 0.02

≈0.01

20

0

51.6

0.2

81.64 ± 0.35

13.92 ± 0.25

3.34 ± 0.11

0.13 ± 0.01

ND

10

49.5

0.1

84.79 ± 0.38

12.53 ± 0.18

2.78 ± 0.09

0.09 ± 0.01

ND

25

48.2

ND

86.06 ± 0.49

11.99 ± 0.24

2.14 ± 0.06

0.12 ± 0.02

≈0.01

40

47.4

ND

86.74 ± 0.67

11.65 ± 0.19

1.93 ± 0.08

0.13 ± 0.02

ND

22

0

50.3

0.1

83.26 ± 0.36

12.36 ± 0.26

3.26 ± 0.09

0.14 ± 0.35

ND

10

47.7

ND

86.78 ± 0.54

10.65 ± 0.22

2.57 ± 0.12

0.12 ± 0.01

≈0.01

25

45.5

ND

88.44 ± 0.53

10.21 ± 0.16

2.03 ± 0.09

0.14 ± 0.01

ND

40

45.0

ND

89.66 ± 0.26

9.73 ± 0.25

1.83 ± 0.13

0.08 ± 0.01

ND

Cooking at 170 °C

18

0

48.9

0.2

81.73 ± 0.25

15.11 ± 0.32

3.28 ± 0.10

0.12 ± 0.01

ND

10

46.8

ND

84.05 ± 0.36

13.87 ± 0.24

2.67 ± 0.06

0.11 ± 0.01

ND

25

45.6

ND

84.78 ± 0.32

13.23 ± 0.14

2.13 ± 0.11

0.09 ± 0.01

≈0.01

40

44.8

ND

85.63 ± 0.44

12.86 ± 0.17

1.98 ± 0.08

0.12 ± 0.01

ND

20

0

47.8

0.1

83.29 ± 0.45

13.26 ± 0.23

3.19 ± 0.11

0.13 ± 0.02

≈0.01

10

45.0

ND

86.18 ± 0.22

11.78 ± 0.20

2.45 ± 0.13

0.08 ± 0.01

ND

25

42.3

ND

87.04 ± 0.49

10.99 ± 0.13

1.65 ± 0.06

0.14 ± 0.02

≈0.01

40

41.6

ND

87.75 ± 0.19

10.72 ± 0.26

1.52 ± 0.06

0.09 ± 0.01

ND

22

0

46.4

ND

84.52 ± 0.45

11.13 ± 0.25

3.06 ± 0.12

0.14 ± 0.01

≈0.01

10

42.7

ND

88.08 ± 0.38

9.67 ± 0.23

2.25 ± 0.08

0.11 ± 0.02

ND

25

40.2

ND

89.13 ± 0.26

9.04 ± 0.25

1.50 ± 0.05

0.09 ± 0.02

ND

40

39.1

ND

89.82 ± 0.21

8.76 ± 0.22

1.38 ± 0.07

0.09 ± 0.01

ND

  1. All the data are shown as mean ± SD
  2. ND not detected
  3. aCalculations were based on original oven-dried chip mass
  4. bCalculations were based on oven-dried pretreatment-kraft pulp mass
  5. cValues are expressed as averages of two replicate experiments
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Biotechnology for Biofuels and Bioproducts

ISSN: 2731-3654

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