Sustainable bleaching of Eucalyptus sp. kraft pulp with hypochlorous acid, ozone and hydrogen peroxide

Ferro, Estefania Isaza; Ruuttunen, Kyösti; Perrin, Jordan; Vuorinen, Tapani

doi:10.1016/j.indcrop.2021.114004

Cited by 12 publications

(3 citation statements)

References 18 publications

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“…En la extracción de pulpa papelera, también es común utilizar el clorito de sodio (NaClO 2 ) (Kassab et al, 2020), peróxido de hidrógeno al 5% (Harini et al, 2018) y a pH 9 (Rizwan et al, 2021), dióxido de cloro (ClO₂) (Kaur et al, 2018), con la finalidad de quitar la lignina solubilizada (Bajpai, 2018;Hart, 2019) y el color debido al licor negro que se observa en la pulpa extraída, mediante la oxidación o alteración de agrupaciones de la molécula de lignina, que absorben la luz, y los blanqueadores, pueden alterar los cromóforos que son sistemas de dobles enlaces conjugados que surgen en la lignina de las pulpas (Bajpai, 2018a). Otros investigadores han planteado una mezcla química con resultados prometedores, usando ácido hipocloroso, ozono y peróxido de hidrógeno, que permite obtener pulpas totalmente blanqueadas, de modo rápido, con menos consumo de energía, baja generación en el contenido de halógenos ligados orgánicamente y así efluentes aeróbicamente degradables por una menor carga de blanqueo (Ferro et al, 2021;Kaur et al, 2018;Sharma et al, 2020), de allí su gran ventaja ambiental; beneficiando además con una mayor resistencia de la pulpa (Kaur et al, 2018).…”

Section: Parámetros De Extracción Y Rendimiento De Pulpa Papelera De ...unclassified

Caracterización bromatológica y obtención de pulpa papelera de frijol caupí (Vigna unguiculata) cultivado con biocarbón tratado en biol vacuno en San Francisco-Yarinacocha

Reátegui¹,

Tarazona²,

Reátegui³

2023

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Editora Direitos para esta edição cedidos à Atena Editora pelos autores. Open access publication by Atena Editora Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição-Não-Comercial-NãoDerivativos 4.0 Internacional (CC BY-NC-ND 4.0). O conteúdo do texto e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores, inclusive não representam necessariamente a posição oficial da Atena Editora. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterála de nenhuma forma ou utilizá-la para fins comerciais.Todos os manuscritos foram previamente submetidos à avaliação cega pelos pares, membros do Conselho Editorial desta Editora, tendo sido aprovados para a publicação com base em critérios de neutralidade e imparcialidade acadêmica.A Atena Editora é comprometida em garantir a integridade editorial em todas as etapas do processo de publicação, evitando plágio, dados ou resultados fraudulentos e impedindo que interesses financeiros comprometam os padrões éticos da publicação. Situações suspeitas de má conduta científica serão investigadas sob o mais alto padrão de rigor acadêmico e ético. Conselho Editorial Ciências Agrárias e Multidisciplinar

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Section: Parámetros De Extracción Y Rendimiento De Pulpa Papelera De ...unclassified

Caracterización bromatológica y obtención de pulpa papelera de frijol caupí (Vigna unguiculata) cultivado con biocarbón tratado en biol vacuno en San Francisco-Yarinacocha

Reátegui¹,

Tarazona²,

Reátegui³

2023

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“…Hydrogen peroxide (H 2 O 2 ) has been widely used for disinfection, chemical processing, , water treatment, − and bleaching , in industry, research laboratories, hospitals, and households. Recently, distributed electrochemical production of H 2 O 2 , in place of the centralized anthraquinone process, has attracted growing attention as a candidate for sustainable chemical processes and energy storage .…”

Section: Introductionmentioning

confidence: 99%

Machine Learning Assisted Analysis of Electrochemical H₂O₂ Production

Leem

Vallez

Gill

et al. 2023

ACS Appl. Energy Mater.

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The two-electron water oxidation reaction (2e– WOR) provides an option for on-site production of the valuable chemical hydrogen peroxide (H2O2). A major challenge for the 2e– WOR is the need to improve its selectivity toward H2O2 over O2 production through the oxygen evolution reaction. Electrolyte engineering has shown great promise in improving the selectivity and production rates toward H2O2. However, experimental efforts in optimizing the electrolyte only yield results at discrete conditions, which does not provide a complete picture of performance over the entire parameter range. Here, we apply a machine learning assisted prediction to map out the performance of electrochemical H2O2 production over the continuous parameter space of electrolyte composition and applied potential. We collected experimental data of faradaic efficiencies (FE H2O2 ) and current densities toward H2O2 (J H2O2 ) as functions of the applied potential and carbonate ion mole fractions (HCO3 – and CO3 2–) in the electrolyte. The data were then used to train a support vector regression model with 5-fold cross-validation. The accuracy of the model was verified against additional experimental results. The model identified that a maximum H2O2 current density of 2.16 mA/cm2 can be achieved from an optimized bicarbonate ion mole fraction of 0.225 at an applied potential of 3.25 V vs RHE. Lastly, the continuous model enables us to evaluate the thermal efficiency, H2O2 electricity cost, and time needed to produce a set amount of H2O2 over a broad range of electrolytes and applied potential conditions. This work demonstrates how machine learning enables the use of discrete experimental points to construct a continuous picture of electrochemical H2O2 production with high accuracy.

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“…Researchers have attempted to reduce the production of AOX at the source [ 17 , 18 ]. Hypochlorite was generated owing to the decomposition of chlorine dioxide during the bleaching process [ 19 , 20 ]. Thus, the oxidation and chlorination of lignin occurred simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Preferential Oxidation of Phenolic Lignin Using Chlorine Dioxide on Pulp Bleaching Efficiency

Liu

Deng

Liang

et al. 2022

IJMS

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Chlorine dioxide is widely used for pulp bleaching because of its high delignification selectivity. However, efficient and clean chlorine dioxide bleaching is limited by the complexity of the lignin structure. Herein, the oxidation reactions of phenolic (vanillyl alcohol) and non-phenolic (veratryl alcohol) lignin model species were modulated using chlorine dioxide. The effects of chlorine dioxide concentration, reaction temperature, and reaction time on the consumption rate of the model species were also investigated. The optimal consumption rate for the phenolic species was obtained at a chlorine dioxide concentration of 30 mmol·L−1, a reaction temperature of 40 °C, and a reaction time of 10 min, resulting in the consumption of 96.3% of vanillyl alcohol. Its consumption remained essentially unchanged compared with that of traditional chlorine dioxide oxidation. However, the consumption rate of veratryl alcohol was significantly reduced from 78.0% to 17.3%. Additionally, the production of chlorobenzene via the chlorine dioxide oxidation of veratryl alcohol was inhibited. The structural changes in lignin before and after different treatments were analyzed. The overall structure of lignin remained stable during the optimization of the chlorine dioxide oxidation treatment. The signal intensities of several phenolic units were reduced. The effects of the selective oxidation of lignin by chlorine dioxide on the pulp properties were analyzed. Pulp viscosity significantly increased owing to the preferential oxidation of phenolic lignin by chlorine dioxide. The pollution load of bleached effluent was considerably reduced at similar pulp brightness levels. This study provides a new approach to chlorine dioxide bleaching. An efficient and clean bleaching process of the pulp was developed.

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Sustainable bleaching of Eucalyptus sp. kraft pulp with hypochlorous acid, ozone and hydrogen peroxide

Cited by 12 publications

References 18 publications

Caracterización bromatológica y obtención de pulpa papelera de frijol caupí (Vigna unguiculata) cultivado con biocarbón tratado en biol vacuno en San Francisco-Yarinacocha

Caracterización bromatológica y obtención de pulpa papelera de frijol caupí (Vigna unguiculata) cultivado con biocarbón tratado en biol vacuno en San Francisco-Yarinacocha

Machine Learning Assisted Analysis of Electrochemical H₂O₂ Production

Effects of the Preferential Oxidation of Phenolic Lignin Using Chlorine Dioxide on Pulp Bleaching Efficiency

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Sustainable bleaching of Eucalyptus sp. kraft pulp with hypochlorous acid, ozone and hydrogen peroxide

Cited by 12 publications

References 18 publications

Caracterización bromatológica y obtención de pulpa papelera de frijol caupí (Vigna unguiculata) cultivado con biocarbón tratado en biol vacuno en San Francisco-Yarinacocha

Caracterización bromatológica y obtención de pulpa papelera de frijol caupí (Vigna unguiculata) cultivado con biocarbón tratado en biol vacuno en San Francisco-Yarinacocha

Machine Learning Assisted Analysis of Electrochemical H2O2 Production

Effects of the Preferential Oxidation of Phenolic Lignin Using Chlorine Dioxide on Pulp Bleaching Efficiency

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Product

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Machine Learning Assisted Analysis of Electrochemical H₂O₂ Production