Kinetic Modeling of Humic Acid Production from Oxidized South Sumatera Lignite Toward Green and Sustainable Synthesis
Kusumastuti, Y., Hartanto, D., Sediawan, W., Prasetya, A., Petrus, H., Rahayu, S., Wintoko, J., Anggara, F., Prihutami, P., Sadewo, B., Timotius, D., Harnawan, P., Haryono, A. (2025). Kinetic Modeling of Humic Acid Production from Oxidized South Sumatera Lignite Toward Green and Sustainable Synthesis. EKB Journal Management System, (), -. doi: 10.21608/ejchem.2025.358834.11277
Yuni Kusumastuti; Danang Tri Hartanto; Wahyudi Budi Sediawan; Agus Prasetya; Himawan Tri Murti Bayu Petrus; Suprihastuti Sri Rahayu; Joko Wintoko; Ferian Anggara; Pramesti Prihutami; Brilian Ryan Sadewo; Daniel Timotius; Pebrianto Harnawan; Anung Haryono. "Kinetic Modeling of Humic Acid Production from Oxidized South Sumatera Lignite Toward Green and Sustainable Synthesis". EKB Journal Management System, , , 2025, -. doi: 10.21608/ejchem.2025.358834.11277
Kusumastuti, Y., Hartanto, D., Sediawan, W., Prasetya, A., Petrus, H., Rahayu, S., Wintoko, J., Anggara, F., Prihutami, P., Sadewo, B., Timotius, D., Harnawan, P., Haryono, A. (2025). 'Kinetic Modeling of Humic Acid Production from Oxidized South Sumatera Lignite Toward Green and Sustainable Synthesis', EKB Journal Management System, (), pp. -. doi: 10.21608/ejchem.2025.358834.11277
Kusumastuti, Y., Hartanto, D., Sediawan, W., Prasetya, A., Petrus, H., Rahayu, S., Wintoko, J., Anggara, F., Prihutami, P., Sadewo, B., Timotius, D., Harnawan, P., Haryono, A. Kinetic Modeling of Humic Acid Production from Oxidized South Sumatera Lignite Toward Green and Sustainable Synthesis. EKB Journal Management System, 2025; (): -. doi: 10.21608/ejchem.2025.358834.11277

Kinetic Modeling of Humic Acid Production from Oxidized South Sumatera Lignite Toward Green and Sustainable Synthesis

Egyptian Journal of Chemistry
Articles in Press, Accepted Manuscript, Available Online from 25 June 2025  XML
Document Type: Original Article
DOI: 10.21608/ejchem.2025.358834.11277
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Authors
Yuni Kusumastuti1; Danang Tri Hartanto email orcid 1; Wahyudi Budi Sediawan1; Agus Prasetya1; Himawan Tri Murti Bayu Petrus1; Suprihastuti Sri Rahayu1; Joko Wintoko1; Ferian Anggara2; Pramesti Prihutami3; Brilian Ryan Sadewoorcid 4; Daniel Timotius5; Pebrianto Harnawan6; Anung Haryono6
1Department of Chemical Engineering, Faculty of Engineering, Universitas Gadjah Mada, Sleman, Indonesia
2Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada, Sleman, Indonesia
3Graduate School of Engineering, Hokkaido University, Sapporo, Japan
4Chemical Engineering Department, Universitas Gadjah Mada, Jalan Grafika 2 Yogyakarta 55281, Indonesia
5Chemical Engineering Department, Faculty of Industrial Engineering, Universitas Pembangunan Nasional “Veteran” Yogyakarta, Sleman, Indonesia
6Research Department, PT. Pupuk Sriwidjaja Palembang, Palembang, Indonesia
Abstract
This study investigates the reaction kinetics of hydrogen peroxide (H2O2) oxidation of low-rank coal (lignite) to produce humic acid. Utilizing H2O2 as a green oxidant enhances the environmental compatibility of the process, aligning with Sustainable Development Goals of responsible consumption and production. Scaling up laboratory processes requires practical insights into kinetic parameters that are essential for designing process equipment. The oxidation of coal with H2O2 is solid-liquid reaction, typically governed by three steps to control the process: diffusion through a thin film layer, diffusion through the solid state, and chemical reaction. Despite its potential, research on the kinetics of chemical oxidation in lignite remains relatively limited. In this study, coal particles (-60 +80 mesh) are oxidized using 10% H2O2. At specific time intervals, a certain volume of the solution is taken and measured through titration. The evaluation of kinetic models involves liquid film diffusion (sphere), Jander diffusion (three dimensional), ash diffusion, first order, second order, and surface reaction. The result shows that the oxidized coal demonstrates the addition of carboxyl groups. The kinetics model highlights the surface reaction as the controlling process. The estimated activation energy stands at 29.80 kJ/mol, with an Arrhenius constant of 121.10 min-1. This study suggests the possibility of conducting the reaction at room temperature.
Keywords
Fulvic acid; humic acid; kinetic modeling; lignite; oxidation
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