Study of the Relationship Between Lignin Modification and Pyrolysis Products
Using Cunninghamia lanceolata as the raw material,four types of lignin obtained by four separation methods were selected:milled wood lignin(MWL),alkali lignin(AL),enzyme-modified/mild-acid-labile lignin(EMAL),hydrochloric acid-formaldehyde-modified lignin(FAL),and a kind of alkali lignin demethylation-modified lignin(D-AL).The differences in pyrolysis liquid phase distribution and pyrolysis coke yield were compared among different lignin at 400℃,500℃and 600℃.It was found that the pyrolysis volatile fraction yields were in the order of MWL>FAL>EMAL>AL>D-AL,and the protection of Cα-OH and Cβ-OH effectively reduced the coke yields and increased the yields of the two high-value-added chemicals,coniferaldehyde and 4-acryl-2-methoxyphenol,in the pyrolysis products.
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