May 2021

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293 EDITORIAL

Research, conferences, and COVID-19

Monica Shaw

297 BLEACHING

Peracetate/singlet oxygen chemistry used in post-bleaching of kraft pulp as a practical oxidant for paper machines

Wayne Buschmann and Howard Kaplan

311 DELIGNIFICATION

Gas dispersion in the oxygen delignification process

Jari K?yhk?, Heikki Mutikainen, Kari Peltonen, Riku Kopra,and Markus Honkanen

321 DELIGNIFICATION

The role of gas dispersion in the oxygen delignification process

Jari K?yhk?, Kari Peltonen, Heikki Mutikainen, Riku Kopra,

Hannu Eloranta, Anna Pesonen, and Adriaan van Heiningen

331 RECOVERY CYCLE

Impact and feasibility of a membrane pre-concentration step in kraft recovery

Max Kleiman-Lynch, Diego F. Rivera, Stephen H. Frayne,and Brent D. Keller

? COVER CREDIT: Scanning electron microscope (SEM) images of nylon press felt fibers are compared to evaluate relative corrosivity of several common pulp and paper industry oxidants. This investigation by Buschmann and Kaplan demonstrates the application of Clean Chemistry’s novel peracetate/singlet oxygen chemistry for post-bleach plant pulp brightening and potential impacts of carryover onto paper machines relative to common oxidants used in mill operations (p. 297).