On-site Production of New Bleaching Agent "Peroxymonosulfuric Acid" and Application of It to Pulp Bleaching

2011 ◽  
Vol 65 (9) ◽  
pp. 912-918 ◽  
Author(s):  
Tetsuo Koshitsuka
Keyword(s):  
Bleaching Agent ◽  
Pulp Bleaching

STUDY ON MEASUREMENT MODEL OF LIGNIN CONTENT IN PULP AFTER ALKALINE EXTRACTION

2021 ◽  
Vol 29 (2) ◽  
pp. 94-100
Author(s):  
Zhichao Ma ◽  
Shaoxu Chen ◽  
Yongjun Yin ◽  
Yanying Zhou ◽  
Xiaodan Lu ◽  
...  
Keyword(s):  
Prediction Model ◽  
Lignin Content ◽  
Measurement Model ◽  
Soft Sensor ◽  
Kappa Number ◽  
Pollutant Emissions ◽  
Alkaline Extraction ◽  
Bleaching Agent ◽  
Pulp Bleaching ◽  
Sensor Model

Because kappa number cannot accurately represent the lignin content in the pulp after alkaline extraction, lead to the excessive dosage of bleaching chemicals added and the pollutant content increases. In order to accurately determine the dosage of bleaching agent, reduce pollutant emissions, a prediction model of lignin content of pulp was established by analyzing the correlation between lignin content and alkaline extraction conditions in this paper. The results show that the established soft sensor model can accurately measure lignin content, it is helpful to determine the amount of bleaching agent more accurately, reduce pollutant generation after pulp bleaching.

Elemental chlorine-free bleaching of North American hardwood kraft pulps: Evaluation of oxidant-reinforced extraction variables on overall bleaching optimization

TAPPI Journal ◽  
2013 ◽  
Vol 12 (10) ◽  
pp. 33-41 ◽  
Author(s):  
BRIAN N. BROGDON
Keyword(s):  
Response Surface ◽  
Chlorine Dioxide ◽  
North American ◽  
Yield Loss ◽  
Alkaline Extraction ◽  
Kraft Pulps ◽  
Pulp Bleaching ◽  
Response Surface Models ◽  
Elemental Chlorine ◽  
Surface Models

This investigation evaluates how higher reaction temperatures or oxidant reinforcement of caustic extraction affects chlorine dioxide consumption during elemental chlorine-free bleaching of North American hardwood pulps. Bleaching data from the published literature were used to develop statistical response surface models for chlorine dioxide delignification and brightening sequences for a variety of hardwood pulps. The effects of higher (EO) temperature and of peroxide reinforcement were estimated from observations reported in the literature. The addition of peroxide to an (EO) stage roughly displaces 0.6 to 1.2 kg chlorine dioxide per kilogram peroxide used in elemental chlorine-free (ECF) bleach sequences. Increasing the (EO) temperature by Δ20°C (e.g., 70°C to 90°C) lowers the overall chlorine dioxide demand by 0.4 to 1.5 kg. Unlike what is observed for ECF softwood bleaching, the presented findings suggest that hot oxidant-reinforced extraction stages result in somewhat higher bleaching costs when compared to milder alkaline extraction stages for hardwoods. The substitution of an (EOP) in place of (EO) resulted in small changes to the overall bleaching cost. The models employed in this study did not take into account pulp bleaching shrinkage (yield loss), to simplify the calculations.

A Report on 2008 International Pulp Bleaching Conference

2008 ◽  
Vol 62 (9) ◽  
pp. 1147-1155
Author(s):  
Tomoya Yokoyama ◽  
Koki Kisara ◽  
Iori Tomoda ◽  
Kazuhiro Kurosu ◽  
Shiho Katsukawa ◽  
...  
Keyword(s):  
Pulp Bleaching

Trend of Pulp Bleaching Research in Oji Paper

2011 ◽  
Vol 65 (9) ◽  
pp. 866-872
Author(s):  
Makoto Iwasaki
Keyword(s):  
Pulp Bleaching

Efficient Enzymatic Process for Mulberry Paper Production: An Approach for Xylooligosaccharide Production Coupled with Minimizing Bleaching Agent Doses

2021 ◽  
Author(s):  
Thanongsak Chaiyaso ◽  
Pinpanit Boonchuay ◽  
Shinji Takenaka ◽  
Charin Techapun ◽  
Pornchai Rachtanapun ◽  
...  
Keyword(s):  
Bleaching Agent ◽  
Enzymatic Process ◽  
Paper Production ◽  
Mulberry Paper
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