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The Process Development Center

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Facilities Available for Use - Bleaching

For many years the PDC has worked closely with the pulp and paper industry to develop new and effective bleaching sequences. We can perform a wide range of bleaching sequences on mechanical, recycled and chemical pulps.

The main objective of bleaching is to produce a brighter pulp. This is accomplished in chemical pulps primarily through lignin removal. The removal of other compounds is another objective of the bleaching process. These compounds include resins, fatty acids and other extractives.

Both Totally Chlorine Free (TCF) and Elemental Chlorine Free (ECF) sequences are routinely performed here at the PDC’s labs. The sequences may be comprised of a variety of stages, including chelation, enzyme, oxygen, ozone, chlorine, chlorine dioxide, extraction and hydrogen peroxide stages. Oxygen delignification and hydrogen peroxide bleaching at high temperature and high pressure are carried out in reactor vessels. Ozonation at high consistency takes place in a rotating glass vessel. For liquid bleaching agents, PDC researchers utilize the more conventional technique involving polyester bags.

Bleaching Equipment


Bleach Effluent Analysis

To begin working with us, visit our Planning Your Project page.

Image Description: Image of shaded papers

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Contact Information

The Process Development Center
5737 Jenness Hall
Orono, ME 04469
Phone: 207.581.2281 | Fax: 207.581.4174
The University of Maine
Orono, Maine 04469
A Member of the University of Maine System