Anthraquinone is a digester additive used to benefit the digester and recovery operations in a variety of ways. Kemira’s KemAQ is an ultra-high purity micronized aqueous slurry of anthraquinone (AQ) with concentrations of 30, 50 and 60%.
During alkaline pulping (kraft or soda), anthraquinone works via reduction/oxidation (REDOX) reactions to produce two important effects:
KemAQ has various benefits to the pulping process, with yield increase being the most important one. KemAQ can increase yield 0.8-1.5% with dosages in the range 0.02 to 0.05%. Yield increases depend on factors such as operating conditions, wood type, wood source, age of chips, digester type, etc.
Kemira KemAQ is currently sold only in Canada.