Date of Award


Degree Name

Bachelor of Science


Paper Science and Engineering


Semichemical pulping involves both mechanical and chemical pulping techniques. In semichemical pulping the liquor is in contact with the chips for a relatively short period of time. The faster with liquor can penetrate the chips before they see mechanical action, the better the pulp properties. The effects of adding a surfactant to the liquor was studied. It was found that the anionic ethoxylated surfactant which was added at the addition rate of 5#/ton to non-sulfur semi-chemical pulping liquor increased the lignin content of the resulting pulp and lowered the tensile strength.