Nitric acid-potassium hydroxide fractionation of rice straw: an integrated biorefinery initiative
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M. Mostafizur Rahman
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Nur-Al-Sarah Rafsan
Abstract
Pulping of rice straw was studied using mild nitric acid in mild conditions. Spent nitric acid was chosen as soil nutrient rather than followed by the liquor recovery. The rice straw was treated with 11.03% nitric acid at 90 °C for 3 h, yielded 53.09% pulp. Nitric acid treated rice straw pulp had high residual lignin and minerals. However, further treatment with 7% potassium hydroxide reduced the residual lignin and produced pulp with kappa number 20.36. The papermaking properties of the nitric acid followed by KOH treated pulp showed better quality than the nitric acid pulp. The spent nitric acid liquor was reused repeatedly, pulp yield decreased and residual lignin content increased in each step of spent nitric acid reusing. The spent nitric acid liquor and potassium hydroxide liquor-mixed together to get a neutral effluent liquor which was rich with potassium, nitrogen and biomass. The nutritional capacity of the effluent liquor was assessed by incubation with control soil. The labile form of organic carbon, nitrogen, potassium phosphorous and iron increased in the incubated soil.
Funding source: Bangladesh Council of Scientific and Industrial Research
Award Identifier / Grant number: Unassigned
Acknowledgment
The authors are thankful to the Bangladesh Council of Scientific and Industrial Research (BCSIR) for providing the necessary funds to carry out this research. The authors have no conflicts of interest regarding the submission.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: The authors would like to express their gratitude to the Bangladesh Council of Scientific and Industrial Research (BCSIR) for the financial support.
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Conflicts of interest: Consent to participate.
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© 2023 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Biorefining
- Possible alternatives for using kraft lignin as activated carbon in pulp mills – a review
- Technical kraft lignin from coffee parchment
- Nitric acid-potassium hydroxide fractionation of rice straw: an integrated biorefinery initiative
- Paper technology
- The influence of fibrous suspension flow regimes on the formation of tissue paper manufactured from different furnish compositions
- Paper physics
- Assessment of paperboard large deformation at fold using digital image correlation technique
- Paper chemistry
- Response surface methodology optimization and antimicrobial activity of berberine modified trimethoprim carboxymethyl cellulose
- Packaging
- Addition of bentonite to cationic starch matrix for coating on kraftliner paper to improve grease resistance
- Recycling
- Changes in water-vapor-adsorption isotherms of pulp fibers and sheets during paper recycling, including drying of wet webs, and disintegration and sonication of dried sheets in water
- Determination of fines in recycled paper
- Disintegration of toilet papers used in shopping malls
- Nanotechnology
- Cryoslash as an effective pre-treatment to obtain nanofibrillated cellulose using ultra-fine friction grinder with kraft pulp
- Pre-treatment with calcium hydroxide and accelerated carbonation for cellulosic pulp fibrillation
- Chemical technology/modifications
- Study on manufacturing hot water-resistant PVOH coated paper by gas grafting palmitoyl chloride (II)–Control of palmitoyl chloride penetration by inorganic pigments coating
- Lignin
- Efficient and eco-friendly isolation and purification of lignin from black liquor with choline chloride-based deep eutectic solvents
- Misc
- Flocculation of alkyl ketene dimer and calcium carbonate on paper sizing and filling performance
Artikel in diesem Heft
- Frontmatter
- Biorefining
- Possible alternatives for using kraft lignin as activated carbon in pulp mills – a review
- Technical kraft lignin from coffee parchment
- Nitric acid-potassium hydroxide fractionation of rice straw: an integrated biorefinery initiative
- Paper technology
- The influence of fibrous suspension flow regimes on the formation of tissue paper manufactured from different furnish compositions
- Paper physics
- Assessment of paperboard large deformation at fold using digital image correlation technique
- Paper chemistry
- Response surface methodology optimization and antimicrobial activity of berberine modified trimethoprim carboxymethyl cellulose
- Packaging
- Addition of bentonite to cationic starch matrix for coating on kraftliner paper to improve grease resistance
- Recycling
- Changes in water-vapor-adsorption isotherms of pulp fibers and sheets during paper recycling, including drying of wet webs, and disintegration and sonication of dried sheets in water
- Determination of fines in recycled paper
- Disintegration of toilet papers used in shopping malls
- Nanotechnology
- Cryoslash as an effective pre-treatment to obtain nanofibrillated cellulose using ultra-fine friction grinder with kraft pulp
- Pre-treatment with calcium hydroxide and accelerated carbonation for cellulosic pulp fibrillation
- Chemical technology/modifications
- Study on manufacturing hot water-resistant PVOH coated paper by gas grafting palmitoyl chloride (II)–Control of palmitoyl chloride penetration by inorganic pigments coating
- Lignin
- Efficient and eco-friendly isolation and purification of lignin from black liquor with choline chloride-based deep eutectic solvents
- Misc
- Flocculation of alkyl ketene dimer and calcium carbonate on paper sizing and filling performance
