The Effect of Oxidized White Liquor on Pulp Brightness in Peroxide Bleaching in Pulp Mills

Abstract:

This paper aims to study the effect of using Oxidized White Liquor (OWL) on pulp brightness in peroxide bleaching. The proper setting of the concentration of hydrogen peroxide, the bleaching temperature, and the bleaching time was also studied. The Central Composite Design (CCD) was proposed to generate necessary experimental runs. Regression analysis was used to determine the relationship equation. Optimization helped determine that to obtain the targeted brightness of 83%, the ratio between the volume of OWL and sodium hydroxide should be 50:50. This ratio should be used with a concentration of hydrogen peroxide at 6.9 g/kg, a bleaching temperature of 90 ^oC and a bleaching time of 75 minutes.

• Periodical: Advanced Materials Research (Volume 974)
• Pages: 230-234
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.974.230
• Online since: June 2014
• Authors: Nopdanai Khajornpaisan*, Napassavong Rojanarowan
• Keywords: Central Composite Design, Design of Experiment (DOE), Oxidized White Liquor, Peroxide Bleaching, Pulp Brightness

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