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Licensed Unlicensed Requires Authentication Published by De Gruyter June 1, 2005

Monitoring of Lignin and Hemicelluloses in Spent Cooking Liquor during Kraft Delignification

T. Bikova, V. Klevinska and A. Treimanis
From the journal

Summary

A direct and rapid method for determining the average molecular weight (MW) and content of lignin and hemicelluloses in spent cooking liquor by high performance size-exclusion chromatography (HPSEC) using a cartridge glass column and 2.5 mM NaOH as an eluent was developed. A Uv290 detector in line with a RI detector was applied to characterise lignin and hemicelluloses, respectively, from liquor during the kraft cooking of grey and black alder wood. During the main delignification stage, the concentration of high-MW wood components in liquor changed through the maximum. The MW values of hemicelluloses in the liquor decreased to DPn = 30 ± 5 and DPw = 55 ± 5. The n and w of lignin in spent kraft cooking liquor during the main and final delignification stages did not exceed 3000 and 5000, respectively.

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Published Online: 2005-06-01
Published in Print: 2000-01-28

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