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Official Journal of the Japan Wood Research Society

Table 6 S/V ratio and combined yields of Sa and Va of purified soda-AQ lignin obtained under various conditions

From: Totally chlorine-free bleaching of prehydrolysis soda pulp from plantation hardwoods consisting of various lignin structures

Prehydrolysis temperature (°C)a

Active alkali dosage (%)b

Acid-insoluble lignin (%)

Acid-soluble lignin (%)

Sa and Va yields (mmol/g-lignin)

S/V ratio

150

15

84.1

4.1

0.45

4.9

150

18

85.5

6.1

0.42

4.2

150

22

87.2

6.3

0.33

2.9

160

18

86.4

9.0

0.20

2.8

170

18

88.6

9.4

0.19

2.9

  1. aPrehydrolysis time: 2.5 h
  2. bCooking conditions: 150 °C and 3 h