The effect of quinone compounds addition on chemimechanical and Semichemical pulping process, such as neutral sulfite, cold soda and sodium carbonate pulping, has been studied.
By adding quinone to the neutral sulfite pulping process under high temperature, softening of the chemical treated chip was accelerated uniformly, and refining power consumption and shives in pulp were reduced. Furthermore, pulp qualities such as brightness and strength properties were improved.
Quinone compounds, such as dihydrodihydroxyanthracene, anthraquinone and its derivatives which have low redox potential gave good results.
However, quinone was ineffective in a treatment of chips under low temperature, such as cold soda process.
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