Is Oxygenated Compounds Interesting Bleaching Agents for TMP and CTMP?, 2016 International Mechanical Pulping (IMPC) Conference

In mechanical pulping, bleaching aims at removing the chromophores in lignin. For such an objective, CTP initiated a project dedicated to the use of oxygenated compounds in mechanical pulps bleaching.
Softwood TMP was treated with oxygen in different alkaline conditions (O stage). The higher the alkali charge, the higher the pulping yield loss, indicating that the alkali charge had to be optimised. If the O
stage did not improve the TMP final brightness, the tensile strength was enhanced by 15% at the detriment of the scattering coefficient. Oxygen treatment could be an interesting treatment for TMP if it
was carried out without alkali, allowing peroxide savings (10%) and improvement of scattering coefficient.  The oxygen-reinforced peroxide bleaching (OP) seemed to be interesting for bleaching softwood TMP and aspen CTMP, if a low oxygen charge was used, inducing an increase in the final brightness and pulp properties and peroxide savings without degradation of optical properties. Finally, spruce TMP and PGW
and aspen CTMP were treated with ozonated water before or after an alkaline peroxide stage. If the wood extractives were highly degraded, the pulp quality was slightly negatively affected by such a treatment.

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