Abstract: Three kinds of extraction pretreatment, including hot-water, 1% NaOH and benzene-alcohol extraction methods, were used to improve the quality of pyrolytic products derived from Salix cheilophila Schneid. The pyrolytic products were investigated by TG-FT-IR and Py-GC/MS. The Results indicated that hot-water and benzene-ethanol extractions decreased the yields of char residues while 1% NaOH extraction was in reverse. The kinetics analysis using Coats-Redfern method showed that low temperature section was fitted well with the first order kinetics, and the high section was fitted well with the second order kinetics. Extraction pretreatments had positive effect to the pyrolysis reaction because of the reduction of the activation energies. GC content of phenols and ketones were increased after the 1% NaOH extraction pretreatment. After the hot-water extraction pretreatment, the GC content of aldehydes, phenols and acids decreased while the content of esters and ethers increased. There was no obvious change in GC content of pyrolysis components with the pretreatment of benzene-ethanol extraction.

Key words: Salix cheilophila Schneid., extraction pretreatment, pyrolysis characteristic, kinetcs, product component