Abstract
A high molecular weight lignin fraction, alcohol bisulfite lignin, was isolated from the spent liquor of alcohol bisulfite pulping of Japanese cedar ( Cryptomeria japonica D. Don) wood and subjected to analytical pyrolysis. The resulting products were compared with those from the original wood, its milled wood lignin and a synthetic lignin. The alcohol bisulfite lignin yielded several characteristic pyrolysis products compared with the other samples: a large yield of 4-propylguaiacol and small amounts of methylated compounds. Furthermore, analytical pyrolysis of the alcohol bisulfite lignin gave a much smaller yield of coniferyl alcohol than that from Japanese cedar wood. These differences are due to the chemical change in the lignin structure as a result of the alcohol bisulfite treatment.
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