Pulp & Paper

Hydrogen peroxide is rapidly replacing chlorine as the bleaching agent of choice for increasing brightness of paper pulp. In the absence of a stabilizer, a significant portion of peroxide is wasted as a result of decomposition, catalyzed by heavy metals present both in the wood pulp and in the process equipment. Dequest® phosphonates effectively sequester transition metal ions such as iron, copper and manganese, allowing the peroxide to do its work as a brightening agent. Dequest can also be used as a pretreatment chemical for wood pulp for extraction of transition metals prior to actual bleaching.

Phosphonates also offer scale inhibition in the bleaching bath, a function not provided by more typically used stabilizers, such as sodium silicate and DTPA.