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Teguh Riyanto
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Editorial Office of Journal of Chemical Engineering Research Progress BCREC Publishing Group and PT Laboratorium Terpadu, Universitas Diponegoro Laboratory of Plasma-Catalysis (R3.5), UPT Laboratorium Terpadu, Universitas Diponegoro Jl. Prof. Soedarto, Semarang, Central Java, Indonesia 50275
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Journal of Chemical Engineering Research Progress
Published by Universitas Diponegoro
ISSN : -     EISSN : 30327059     DOI : https://doi.org/10.9767/jcerp
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy Engineering Materials Science & Nanotechnology
The Journal of Chemical Engineering Research Progress (e-ISSN: 3032-7059; Short Abbreviation Title: J. Chem. Eng. Res. Prog.) is an international research journal and invites contributions of original and novel fundamental research. The JCERP journal aims to provide an international forum for the presentation of original fundamental research, interpretative reviews and discussion of new developments in chemical engineering discipline. Papers which describe novel theory and its application to practice are welcome, as are those which illustrate the transfer of techniques from other disciplines, including: fundamentals of chemical engineering; advanced materials related to chemical engineering; applied/industrial chemistry; chemical reaction engineering kinetics; chemical reactor design and optimization; chemical engineering process design and computation; etc. related to chemical engineering discipline.
Arjuna Subject : Teknik Kimia (semua kategori) - Kimia Proses dan Teknologi
Articles 102 Documents
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Elemental Sulfur as a Catalyst Precursor for Gas-Liquid Heterogeneous Chlorination of Acetic Acid: Kinetics and Optimization for Enhanced Monochloroacetic Acid Selectivity and Productivity Wi, Kwang Il; Kim, Ri Myong; Ryo, Tae Hun; Ri, Song Chol; Kim, Nam Chun; Han, Hak Chol; Han, Un Chol; Choe, Hae Song; Ri, Kwang Won
Journal of Chemical Engineering Research Progress 2026: Just Accepted Manuscript and Article In Press 2026
Publisher : UPT Laboratorium Terpadu, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/jcerp.20704

Abstract

Monochloroacetic acid (MCA) is a pivotal intermediate in agrochemicals and pharmaceuticals, but its industrial synthesis via acetic acid chlorination faces challenges related to selectivity and reaction time. This study investigates the kinetics of gas-liquid heterogeneous acetic acid chlorination using elemental sulfur as a catalyst precursor to establish a scientific basis for process optimization. A consecutive-parallel reaction mechanism was proposed incorporating acetic acid consumption, acetyl chloride conversion, MCA formation, and dichloroacetic acid (DCA) formation. Kinetic parameters were determined at 353, 363, 373, and 383 K in a steel bubble column reactor with fixed initial sulfur concentration (1.92 mol/L) and Cl₂ space velocity (4.028 L·L⁻¹·h⁻¹). The activation energy for DCA formation (87.55 kJ·mol⁻¹) was substantially higher than that for MCA accumulation (52.40 kJ·mol⁻¹). Relative rate analysis revealed that k₃/k₄ decreases continuously from 1.83 at 353 K to 0.76 at 383 K, confirming that lower temperatures favor MCA selectivity. The proposed kinetic model showed excellent agreement with experimental data (R² > 0.98). Based on the kinetic analysis, three optimization strategies were derived: maintaining high acetic acid concentration, dynamic adjustment of Cl₂ feed rate, and implementation of a decreasing temperature-time profile. This work provides a scientific basis for optimizing industrial MCA synthesis using low-cost sulfur as a catalyst precursor.
Process Simulation and Optimization of Propane Dehydrogenation over Pt-Sn/Al₂O₃: A Langmuir-Hinshelwood Approach Alfarabi, Kemas Muhammad Fachmi; Setiawan, Flantino; Luqman, Muhammad Adlan; Hanani, Maryam Hilaifa; Haribowo, Praditya Rizky; Malau, Jon Saul
Journal of Chemical Engineering Research Progress 2026: Just Accepted Manuscript and Article In Press 2026
Publisher : UPT Laboratorium Terpadu, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/jcerp.20713

Abstract

Propane dehydrogenation (PDH) has emerged as a critical process for propylene production due to increasing global propylene demand and limitations of conventional methods such as steam cracking and fluid catalytic cracking. This study develops a kinetic model for propane dehydrogenation over a Pt-Sn/Al₂O₃ catalyst using a Langmuir–Hinshelwood Hougen Watson (LHHW) framework, wherein the second hydrogen abstraction step is assumed to be the rate-determining step. The kinetic model incorporates non-dissociative propane adsorption, competitive adsorption of propane, propylene, and hydrogen, as well as reverse reactions and catalyst deactivation associated with coke formation. The model was implemented in Aspen Plus/HYSYS using a plug flow reactor (PFR) under steady-state, isothermal conditions. Operating parameters included temperatures of 823–923 K, pressures of 1–5 bar, and feed ratios ranging from 1:0 to 1:2. Base-case simulation results revealed extremely low propane conversion on the order of 10⁻⁸, indicating significant kinetic limitations despite the endothermic heat duty of approximately –6.78 × 10⁴ kJ/h. A temperature sensitivity analysis conducted between 760°C and 1000°C showed no improvement in conversion with increasing temperature; instead, a slight decreasing trend was observed. This anomaly suggests that adsorption effects dominate under the Langmuir–Hinshelwood formulation, and that the selected kinetic parameters may be inadequate for the simulated temperature range. The results indicate that temperature variation alone is insufficient to enhance reactor performance. Further model refinement is required, including re-evaluation of kinetic parameters (pre-exponential factor and activation energy), adjustment of adsorption constants, consideration of non-isothermal reactor behavior, and increased catalyst loading or residence time.

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