Chemical Pulping of Wood Chips

Wood chip quality (size and thickness uniformity) 

Wood chip moisture content Sulfidity of cooking liquor Strength of chemical application Liquor-to-wood ratio Temperature cycle Cooking time/Reaction rate 

Batch Digester Advantages Continuous Digester Advantages 

Chemicals NaOH, Na2S anthraquinone, polysulfide (extended) 

The increasing demands on the pulp and paper industry to reduce emissions from bleaching operations has lead to modifications of the cooking process to provide a pulp that requires a decreased amount of bleaching. This is accomplished by decreasing the amount of residual 

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