peroksidaristikoinnin

Peroksidaristikoinnin, often translated as "peroxide reduction" or "peroxide bleaching," is a process primarily used in the pulp and paper industry to whiten wood pulp. It involves the use of hydrogen peroxide as a bleaching agent. This method is considered more environmentally friendly than older chlorine-based bleaching processes, as it produces fewer harmful byproducts.

The process typically involves treating the wood pulp with hydrogen peroxide under controlled conditions of pH, temperature, and time. The peroxide breaks down chromophores, which are the color-causing molecules in the wood pulp, without significantly degrading the cellulose fibers themselves. This results in a brighter, whiter pulp that is suitable for papermaking.

Peroksidaristikoinnin can be performed in various stages of the pulping process. It is often used as a final bleaching step to achieve high brightness levels. The effectiveness of the process can be enhanced by the addition of chelating agents to remove metal ions that can catalyze the decomposition of peroxide, and by careful control of the alkali used to maintain the optimal pH.

While highly effective, the process requires careful management to ensure optimal results and to prevent over-bleaching, which could weaken the pulp. The spent liquor from peroxide bleaching is generally easier to treat than that from chlorine bleaching, further contributing to its environmental advantages.