A STUDY ON THE DEVIATION BETWEEN YIELD AND LIGNIN CONTENT OF HOLOCELLULOSE

Abstract

When the wood was delignified by sodium chlorite, we found obviously that the yield was more than theoretical yield which was calculated from analytical lignin content. This deviation showed the maximum value (over 6 per cent based on the original wood) at the sample having 10-13 per cent lignin contents. In the case of lower lignin contents the deviation value reduced again, and when the lignin contents decreased extremely and the polysaccharides were dissolved considerably, the practical yield was less than the theoretical yield.We attempted a few study for this curious fact. As a result, we found that a part of lignin which was oxidized by sodium chlorite lost condensation ability anddissolved in acids at analytical procedure, so the analytical lignin content was given low value. We confirmed that this deviation decreased if the lignin contents were calculated from the methoxyl contents of the lignins in samples.