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Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 4 List of the ratios between various k values for the comparisons described in the text

From: Effect of type of aromatic nucleus in lignin on the rate of the β-O-4 bond cleavage during alkaline pulping process

 

k GH-erythro /k GH-threo

k GG-erythro /k GG-threo

k GS-erythro /k GS-threo

k SG-erythro /k SG-threo

k SS-erythro /k SS-threo

     

130 °C

3.7

4.3

6.0

5.2

7.9

     

140 °C

3.6

4.2

5.4

5.0

5.9

     

150 °C

3.4

4.1

5.0

4.7

4.5

     

160 °C

3.3

4.0

4.6

4.6

3.5

     

170 °C

3.1

4.0

4.3

4.4

2.7

     
 

k GG/k GH

k GS/k GH

k SS/k SG

k SG/k GG

k SS/k GS

 

erythro

threo

erythro

threo

erythro

threo

erythro

threo

erythro

threo

130 °C

3.5

3.5

15.6

9.8

5.1

3.3

1.5

1.2

1.7

1.2

140 °C

3.4

2.8

13.0

8.5

4.0

3.4

1.4

1.2

1.4

1.3

150 °C

3.3

2.7

11.0

7.5

3.2

3.4

1.3

1.1

1.3

1.4

160 °C

3.2

2.6

9.3

6.6

2.6

3.4

1.2

1.1

1.1

1.5

170 °C

3.1

2.5

8.0

5.9

2.1

3.5

1.2

1.1

1.0

1.5

 

k G′G/k G′H

k G′S/k G′H

k S′G/k S′H

k S′S/k S′H

k S′S/k S′G

     

130 °C

3.5

6.7

2.1

6.2

2.9

     

140 °C

3.1

5.9

2.1

5.6

2.7

     

150 °C

2.7

5.2

2.1

5.2

2.5

     

160 °C

2.4

4.6

2.0

4.8

2.3

     

170 °C

2.1

4.1

2.0

4.4

2.2

     
 

k S′H/k G′H

k S′G/k G′G

k S′S/k G′S

       

130 °C

1.4

0.8

1.3

       

140 °C

1.4

0.9

1.3

       

150 °C

1.3

1.0

1.3

       

160 °C

1.3

1.1

1.4

       

170 °C

1.3

1.3

1.4

       
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