Date of Award


Degree Name

Bachelor of Science


Paper Science and Engineering

First Advisor

Dr. Ellsworth Shriver



The purpose of this thesis will be to examine three carbohydrate protector's effectiveness during oxygen delignification. Today, about half of the lignin can be removed from a conventional kraft pulp through the application of oxygen delignification as an initial stage in the bleaching process. More extensive delignification results in the degradation of pulp carbohydrates, influencing the final pulp qualities.1 Carbohydrates are attacked by the decomposition of hydroperoxides catalyzed by heavy metal ions, free radicals. Carbohydrate protectors function to deactivate the free radicals, reducing the rate of attack on the carbohydrates.2 This thesis is based on the above principle. The carbohydrate protectors for comparison are thylenediamine Tetraacetic Acid (EDTA). Aluminum Sulfate [Al (2SO4)3] and Magnesium Sulfate [Mg2SO4].