Abstract:

Bamboo (Phyllostachys pubescens) residue and its three components could be hydrolyzed by strong acid to produce bamboo vinegar. The forming mechanism of its components of acetic acid, furfural and methanol was discussed. Bamboo residue was separated to xylan, lignin and cellulose by Alcell pulping process. By hydrolyzing these components with strong acid, a new way of friendly utilization of bamboo residues and it's Alcell pulping black liquor was discovered. Chemical analysis of the distillates of bamboo residue and its main components with low temperature pyrolysis and/or acid hydrolysis was compared. The results showed that the distillates collected in the range of 120～140 ℃ contained little methanol and comparatively more of acetic acid and furfural. From acid hydrolysis of single component, acetic acid and furfural mainly came from the decomposition of xylan, while the methanol was mainly originated from the hydrolysis of the methoxyl group of the lignin. There were far more distillates, with mass of 212.78 g from acid hydrolysis than that from carbonization, with mass of 12.341 g by processing the same amount of bamboo residue. High quality bamboo vinegar rich in acetic acid, furfural and ethanol, and with little methanol could be obtained from the acid hydrolysis of xylan separated from Alcell pulping liquor.

Key words: bamboo residue, xylan, lignin, cellulose, acid hydrolysis