To prevent the severe degradation of cellulose, ozone bleaching experiments have been carried out with douglas fir kraf t pulp in the presence of various inorganic and organic compounds.
The effect of these additives was evaluated on the basis of viscosity as the indicator of cellulose degradation. The results obtained were as follows.
1. Mg compounds, I compounds and triethanolamine, which had been found as effective cellulose protector in oxygen bleaching, did not offered no protection to cellulose.
2. The addition of small amounts of metal salts, such as Fe and Cu, increased cellulose degradation.
3. In many organic additives, urea-methanol, methanol, DMF and DMSO were found to have significant effect on protection to cellulose.
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