Abstract:

The catalyzed liquefied degradation of beet pulp（BP）in the system of solid phosphotungstic acid as catalyst and polyethyleneglycol 400（PEG 400）/ glycerol（GLY）as complex liquefier was studied，and the effect of processing conditions of BP liquefaction such as liquefaction temperature，catalyst amount，liquid-to-solid ratio，liquefaction time on the liquefaction reaction and properties of liquefaction product were investigated. The results showed that BP had good liquefaction effect，the optimum liquefaction processing conditions were determined as follows：PEG 400/glycerol mass ratio 4∶1，liquefaction temperature 160 ℃，catalyst amount 4%，liquid-to-solid mass ratio 12∶1 and liquefaction time 160min，the liquefaction rate would reach 99.0%. Hydroxyl value and acid value of liquefaction mixtures were 45—86 mg/g and 0.61—0.75 mg/g respectively，which was a low hydroxyl value plant-based polyol.