ANALYSIS OF SUGI WOOD AND ITS LIGNIN PREPARATIONS BY PYROLYSIS-GAS CHROMATOGRAPHY

Curie-point pyrolyses of sugi (Cryptomeria japonica D. Don) wood and i ts lignin preparations were performed at 500 degrees C for 4 s. The re sulting pyrolysates were analyzed by gas chromatography. The lignin pr eparation methods greatly affected the product profiles and the total yields of the pyrolysis products. All pyrograms of isolated lignins di splayed a large peak of 4-methylguaiacol and a very small peak of tuan s-coniferyl alcohol, but the most prominent peak on the sugi wood pyro gram was trans-coniferyl alcohol. The total yields of pyrolysis produc ts were ordered as follows: wood>a dehydrogenation polymer of conifery l alcohol (DHP)>milled wood lignin> hydrochloric acid lignin> alcohol bisulfite lignin> dioxane lignin> thiolignin>>Klason lignin. The total yields of pyrolysis products were strongly dependent on the number of condensed units in the lignins.