Sodium Hydroxide and Calcium Hydroxide Hybrid Oxygen Bleaching with System

5th Annual International Conference on Material Science and Environmental Engineering

材料科学;生态环境科学

Doelle, K.^1 ; Bajrami, B.^1

Department of Paper and Bioprocess Engineering (PBE), State University of New York (SUNY), College of Environmental Science and Forestry (ESF), Syracuse

NY

13210, United States^1

关键词: Bleaching temperature;    Dry fibers;    Kappa numbers;    Oxygen bleaching;    Pine kraft pulps;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/301/1/012136/pdf
DOI  :  10.1088/1757-899X/301/1/012136

来源: IOP

【 摘 要 】

This study investigates the replacement of sodium hydroxide in the oxygen bleaching stage using a hybrid system consisting of sodium hydroxide calcium hydroxide. Commercial Kraft pulping was studied using yellow pine Kraft pulp obtained from a company in the US. The impact of sodium hydroxide, calcium hydroxide hybrid system in regard to concentration, reaction time and temperature for Kraft pulp was evaluated. The sodium hydroxide and calcium hydroxide dosage was varied between 0% and 15% based on oven dry fiber content. The bleaching reaction time was varied between 0 and 180 minutes whereas the bleaching temperature ranged between 70 °C and 110 °C. The ability to bleach pulp was measured by determining the Kappa number. Optimum bleaching results for the hybrid system were achieved with 4% sodium hydroxide and 2% calcium hydroxide content. Beyond this, the ability to bleach pulp decreased.