No-Sulfur Semi-Chemical Pulping with Na₂CO₃ and NaOH

Author

James P. Hanson, Western Michigan University

Date of Award

4-1974

Degree Name

Bachelor of Science

Department

Paper Science and Engineering

Abstract

Na₂CO₃/NaOH cooking liquors were evaluated as possible pulping agents for the production of semichemical pulp for use in corrugating medium. Optimum ratios of Na₂CO₃/NaOH were found to be 2/1 to 4/1. Pulp produced with ratios within these figures were equal to tensile and concora and higher in yield when compared to NSSC pulp made at the same temperature, time and Na₂O/chip ratio. By increasing either the time or the Na₂O, higher tensile and concora tests were obtained but with a slight sacrifice in yield. Na₂CO₃/NaOH pulps are more resistant to refining than NSSC pulps made under comparable conditions and in some cases required more than twice the beating time to reach target Canadian Standard Freeness tests.

Recommended Citation

Hanson, James P., "No-Sulfur Semi-Chemical Pulping with Na₂CO₃ and NaOH" (1974). Paper Engineering Senior Theses. 242.
https://scholarworks.wmich.edu/engineer-senior-theses/242