Date of Award

4-1998

Degree Name

Bachelor of Science

Department

Paper Science and Engineering

First Advisor

Dr. Raja Aravamuthan

Abstract

In the peroxide bleaching process, sodium silicate is currently being used to control metal ions present in the pulp; these metal ions catalyze the decomposition of hydrogen peroxide, reducing the efficiency of the process. However, the addition of sodium silicate can cause scaling the fouling of equipment, wires, and felts. This, in turn, causes expensive downtime for scale removal. This experimental work involved replacing sodium silicate with a non-scale forming borate. This study determined if borate can replace silicate as a stabilizer in the peroxide bleaching process with equivalent bleach response. Rates of bleaching reactions were also determined in various cases.

Borate was found to produce a lower brightness gain, slower rate of reaction, and lower percent peroxide in the residual in comparison to sodium silicate. It was concluded that borate produced a smaller degree of brightness reversion in comparison to sodium silicate.

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