Kraft Pulp Bleaching with a P-stage Catalyzed by both Bicarbonate and TAED, 19PEERS
Peroxide bleaching of softwood and hardwood (eucalypt) kraft pulps was performed in solutions of NaHCO3
, Na2CO3 and NaOH. The conventional P stage (H2O2 + NaOH) was the most effective brightening system without an additional activator. However, peroxide activation by HCO3− was obvious in all cases where NaHCO3 or Na2CO3 was used. When N,N,N’,N’-tetraacetylethylenediamine (TAED) was added to the bleaching system, Na2CO3 as the alkali source afforded equal or slightly higher bleached brightness compared to NaOH usage for both the softwood and hardwood pulps. This outcome is attributed to simultaneous peroxide activation by HCO3− and TAED. When applied to the eucalypt pulp, the H2O2/Na2CO3/TAED bleaching system also decreased the brightness loss due to thermal reversion.
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