Abstract
On the premise of biomass comprehensive using concept, the screw section liquid of aspen APMP was treated by alcohol precipitation method to separate and analyze the hemicelluloses. In the traditional alcohol separation system, not only the effect of the temperature, alcohol dosage, pH value and precipitation time on the hemicelluloses separation was researched, but also the methanol system and alcohol-CPAM system were discussed. The results showed that the hemicelluloses yield was relatively ideal when the AMPM liquid was treated by 2.5 times volume of alcohol at pH of 4.0 at 45°C for 30 min. In addition, compared with alcohol system, the methanol dosage was decreased by about 12% in methanol system and the alcohol dosage was also decreased In the alcohol-CPAM system, when the hemicelluloses yield was similar.
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