Abstract
More than 70 % bleached chemical pulp is produced in India through elemental chlorine-free bleaching in which chlorine-based compounds like chlorine dioxide is a dominant chemical which generates chlorinated organic toxins harmful to the environment. Present studies demonstrate short sequence of bleaching combined with acid treatment, followed by pressurized oxygen delignification. It was found that efficiency of oxygen improved by adding hydrogen peroxide as an additive in oxygen delignification with subsequent treatment with ozone or chlorine dioxide as bleaching agents. It was observed that by using additive in ODL process, pulp can achieve 70±1 (%ISO) brightness. Reduction attains in kappa number 65–70 % as compared to 45–50 % in control oxygen delignification stage. Through AOpZ and AOpD bleaching sequences, full brightness achieved 84–85 (%ISO) without considerable loss in mechanical strength properties compared to DEpD sequence. A potential reduction in COD, color, and AOX was 28, 53.3, and 88 % respectively were observed in AOpZ short bleaching sequence compared to DEpD bleaching.
Funding statement: This study was funded by a consortium of Research Advisory Committee (RAC) under project “Bleaching process intensification through short bleaching sequences using ECF/TCF bleaching technologies for pulp produced from indigenous raw material” sponsored by Department for Promotion of Industry and Internal Trade, DPIIT, New Delhi.
Acknowledgments
Shivani Pundir, Aarti Saini, and Mussaddi Lal Semwal acknowledged for their help with the experiments and thanks to Dr. Snehasis Bhakta for their input while reviewing the manuscript.
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Conflict of interest: The authors declare no conflict of interest.
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Articles in the same Issue
- Frontmatter
- Chemical pulping
- Mapping variation of handsheet properties within loblolly pine trees
- A simplified kinetic model for modern cooking of aspen chips
- Bleaching
- Bleaching of bagasse-pulp using short TCF and ECF sequence
- Mechanical pulping
- Energy efficiency in mechanical pulping – definitions and considerations
- Paper technology
- Development of ash condensation performance of paper materials via saccharides and Nano HAP application
- Effects of calcium silicate synthesized in situ on Fiber loading and paper properties
- Production of fines from refined kraft pulp by fractionation with micro-perforated screens
- Dynamic-head space GC-MS analysis of volatile odorous compounds generated from unbleached and bleached pulps and effects on strength properties during ageing
- Composite paper from an agricultural waste of bagasse sugarcane and pineapple leaf fibre: a novel random and multilayer hybrid fibre reinforced composite paper
- Paper physics
- Phenomenological analysis of constrained in-plane compression of paperboard using micro-computed tomography Imaging
- Paper chemistry
- Preparation and characterization of tung oil-rosin-based polyester internal sizing agent
- Coating
- Research on brightening modification of molecular sieves coated fly ash based on alkaline melting hydrothermal method
- Application of modified cellulose nanofibrils as coating suspension on recycled paper using size press
- Chemical technology/modifications
- Novel calcium carbonate filler for cellulose industry
Articles in the same Issue
- Frontmatter
- Chemical pulping
- Mapping variation of handsheet properties within loblolly pine trees
- A simplified kinetic model for modern cooking of aspen chips
- Bleaching
- Bleaching of bagasse-pulp using short TCF and ECF sequence
- Mechanical pulping
- Energy efficiency in mechanical pulping – definitions and considerations
- Paper technology
- Development of ash condensation performance of paper materials via saccharides and Nano HAP application
- Effects of calcium silicate synthesized in situ on Fiber loading and paper properties
- Production of fines from refined kraft pulp by fractionation with micro-perforated screens
- Dynamic-head space GC-MS analysis of volatile odorous compounds generated from unbleached and bleached pulps and effects on strength properties during ageing
- Composite paper from an agricultural waste of bagasse sugarcane and pineapple leaf fibre: a novel random and multilayer hybrid fibre reinforced composite paper
- Paper physics
- Phenomenological analysis of constrained in-plane compression of paperboard using micro-computed tomography Imaging
- Paper chemistry
- Preparation and characterization of tung oil-rosin-based polyester internal sizing agent
- Coating
- Research on brightening modification of molecular sieves coated fly ash based on alkaline melting hydrothermal method
- Application of modified cellulose nanofibrils as coating suspension on recycled paper using size press
- Chemical technology/modifications
- Novel calcium carbonate filler for cellulose industry