Date of Defense

Spring 4-17-1997

First Advisor

Dewei Qi, Paper and Printing Science and Engineering

Second Advisor

Raja Aravamuthan, Paper and Printing Science and Engineering

Third Advisor

Thomas Joyce, Paper and Printing Science and Engineering

Abstract

Flotation deinking is one of the most important deinking processes in the recycling of paper today. Extensive research has been done on surfactant effects on ink removal efficiency. Often, the concept of process yield and the type of fiber lost is neglected. In order to study the charge type effects on the yield, fiber length distribution and ink removal efficiency, laboratory scale flotation deinking trials were run using anionic and cationic surfactants. To study different process parameters on the surfactants, stock pH and process retention time were also varied. Findings showed that the cationic surfactant used in these experiments produced much lower yields than the anionic surfactant. The cationic surfactant did, however, show a much better percentage ink removal than did the anionic surfactant. Fiber length distributions revealed that cationic surfactants generally remove a shorter fiber fraction than anionic surfactants.

Access Setting

Honors Thesis-Campus Only

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