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Table 4 Functional group associated with precipitates made from the acidification of hydrolysis and soda liquors generated after 45 min of the hydrolysis treatment

From: A process for producing lignin and volatile compounds from hydrolysis liquor

Temperature °C Precipitates of hydrolysis liquor (mmol/g) Precipitates of soda liquor (mmol/g)
170 180 190 170 180 190
Aliphatic OH 2.04 1.54 0.75 1.05 1.14 0.53
C5 substituted 0.33 0.23 0.07 0.35 0.19 0.24
Guaiacyl OH 1.42 1.61 0.94 1.22 1.14 0.86
p-Hydroxy phenyl 0.08 0.06 0 0.1 0.03 0.02
Carboxylic 0.14 0.14 0.06 0.71 0.67 0.53
Total 4.01 3.58 1.81 3.43 3.17 2.18