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Formamidine Sulfinic Acid Used as a Bleaching Chemical On Softwood Tmp
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In this work, we showed that formamidine sulfinic acid, FAS, can be efficiently used as a bleaching chemical for softwood TMP. The bleaching reaction was very rapid. The brightness achieved is dependent on the temperature and the chemical charge applied. The highest brightness was obtained at pH 10, and the lowest yellowness at pH 12. FAS treated pulps are much more stable toward light-induced yellowing. In all cases, FAS bleaching at pH 12 results in much slower and less intense aging than all other pulps, either untreated or bleached with FAS at pH 8 or 10.
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