Abstract
In this study, we investigated the applicability of 4-O-methylglucuronoxylan (xylan) and cellouronate as raw materials for preparing hexenuronic acid groups by alkali-cooking. We also investigated the generation of AOX during chlorine dioxide (ClO2) treatment of the prepared hexenuronic acids. Based on Teleman’s procedure, suitable conditions for alkali-cooking were established for xylan and cellouronate. In the ClO2 treatment, xylan or cellouronate cooked in alkali solution generated AOX in different amounts, which might depend on the solubility of the polymer in acidic solution. In the ClO2 treatment, xylan separated from wood hemicellulose must be removed due to the influence of lignin on AOX generation. Hence, hexenuronic acid groups in alkali-cooked cellouronate can be applied as a standard compound for estimating of the discharge of AOX during ClO2 bleaching.
