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Muhamad Maulana Azimatun Nur
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Eksergi: Chemical Engineering Journal
Published by Universitas Pembangunan Nasional Veteran Yogyakarta
ISSN : 1410394X     EISSN : 24608203     DOI : https://doi.org/10.31315
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology
Eksergi is an open-access, peer-reviewed scientific journal that focuses on research and innovation in the fields of energy and renewable energy. The journal aims to provide a platform for scientists, researchers, engineers, and practitioners to share knowledge and advancements that contribute to sustainable development and energy transition. In addition to energy topics, the journal also accepts high-quality manuscripts related to, but not limited to, the following areas: Separation processes Bioprocesses related to food, energy, and environmental applications Wastewater treatment and resource recovery Process optimization and intensification Carbon capture, utilization, and storage (CCUS) Chemical reaction engineering and reactor design Life cycle assessment (LCA) and sustainability evaluation Process Design and Control Engineering Process Simulations Process System Engineering The journal welcomes original research articles, reviews, and short communications that demonstrate novelty, scientific rigor, and relevance to chemical engineering and interdisciplinary applications.
Arjuna Subject : Energi (semua kategori) - Energi Terbarukan, Keberlanjutan dan Lingkungan
Articles 305 Documents
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Mechanistic Modeling of a Spiral-Wound Nanofiltration Module using DSPM-DE for High-Purity Salt Recovery from Desalination Brine Sugianto, Mohamad; Altway, Ali; Susianto
Eksergi Vol 23 No 1
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v23i1.15947

Abstract

Rejected brine is a concentrated NaCl stream whose elevated Ca²⁺, Mg²⁺, and SO₄²⁻ depress the quality of industrial salt. We built a mechanistic model of a spiral-wound KeenSen NF1-4040F nanofiltration (NF) element using the Donnan–Steric Pore Model with Dielectric Exclusion coupled to the Extended Nernst–Planck equations. Radial transport is coupled to axial mass balances and solved at steady, isothermal conditions over  bar and . Water flux  increases almost linearly with ; along the module  falls and  rises nearly linearly. Recovery increases with  but decreases with . Flux decomposition shows cations are convection-dominated, whereas anions carry larger shares of diffusion and electromigration. Predicted end-of-module rejections are ≈ 99.0-99.3%, ≈ 97.6-98.1%, ≈ 96.0-96.6%, ≈ 88-89%, and ≈ 74-75%, confirming divalent ≫ monovalent selectivity. Linking to product quality, the simulated permeate at  bar and  yields a conservative dry-salt purity of ~96.9 wt% NaCl when all non-halite salts co-precipitate. Under halite-first crystallization with a gypsum pre-step and bittern purge, only a minor fraction co-crystallizes, giving ≥98.5 wt% (≈99.5 wt% for a 20% co-crystallization assumption). Thus, operating at moderate-to-high  with moderate cross-flow not only maximizes recovery and divalent rejection but also supplies a permeate that can be crystallized to SNI-compliant high-purity salt.
Catalytic Disproportionation of Indonesian Gum Rosin over Pd/C Catalyst: GC–MS Analysis and Reaction Mechanism Hardhianti, Meiga Putri Wahyu
Eksergi Vol 23 No 1
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v23i1.15831

Abstract

Indonesian gum rosin is a renewable natural resource with a unique composition characterized by the presence of mercusic acid. This study investigates its catalytic disproportionation over a Pd/C catalyst in a sealed batch reactor at 200 °C and 240 °C to improve chemical stability and explore its reactivity. The reaction products were analyzed using FTIR and GC–MS after methylation. Abietic acid was identified as the most reactive resin acid, undergoing typical disproportionation into hydrogenated (e.g., dihydroabietic) and dehydrogenated (dehydroabietic) derivatives. The formation of dehydroabietic acid was favored at 200 °C, while higher temperature (240 °C) promoted hydrogenation and isomerization side reactions. In contrast, mercusic acid followed a distinct pathway, undergoing selective double-bond isomerization to form structural isomers without changes in molecular weight, as confirmed by identical molecular ions (m/z 364) in the mass spectra. These findings clarify the temperature-dependent reaction behavior of major resin acids and reveal the unique mechanistic role of mercusic acid in Indonesian gum rosin.
Simulation of Biodiesel Production from Waste Cooking Oil Using Methanol-Activated CaO Recycling Catalyst: Kinetic and Techno-Economic Evaluation Panjaitan, Jabosar Ronggur Hamonangan
Eksergi Vol 23 No 1
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v23i1.15839

Abstract

Waste cooking oil is a food industry waste product that can be converted into biodiesel as an alternative fuel. The use of heterogeneous base catalysts such as commercial CaO offers advantages in biodiesel production due to its reusability. This study investigated biodiesel production from waste cooking oil using commercial CaO catalyst through simulations to evaluate kinetics and techno-economics of its production at plant scale. The simulations used in this study were divided into three process schemes. Scheme 1 was a scheme without CaO catalyst recycling, Scheme 2 was a scheme with 3x recycling of the commercial CaO catalyst, and Scheme 3 was a scheme with 10x recycling of the commercial CaO catalyst. The results showed that the recycling process of commercial CaO catalyst used affects the conversion value of waste cooking oil into biodiesel. Lower reaction conversion was obtained with increasing amounts of recycled commercial CaO catalyst. The highest conversion of waste cooking oil to biodiesel achieved in this study was 92.84% from scheme 1. Based on the techno-economic evaluation, scheme 1 was the most profitable compared to the other schemes, with a net present value of US$34,652,659. Schemes 2 and 3 had lower net present values ​​due to the increase in total capital investment and operational costs for recycling commercial CaO compared to scheme 1. Meanwhile, based on CaO catalyst requirements, scheme 3 had the lowest CaO requirement which was 3.06 tons/year.
Formulation and Characterization of Herbal Lip Balm Utilizing Red Dragon Fruit (Hylocereus polyrhizus) Extract as a Natural Colorant and Active Ingredient Samosir, Harrys; Sarmila, Tina; Maharani, Loza Asmi Nahara; Samosir, Devina Sanchia
Eksergi Vol 23 No 1
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v23i1.15867

Abstract

This study formulated an herbal lip balm using dragon fruit extract (Hylocereus spp.) as a natural colorant and moisturizer. The extract was integrated with a base of coconut oil, beeswax, cocoa butter, vitamin E, and rose water. Physical testing indicated an average pH of 5.08 and a melting point of 63–65 °C, complying with standard safety requirements for lip care products. Organoleptic evaluation by 10 panelists demonstrated high acceptance, with 90% approving the soft texture and aroma, and 85% favoring the natural pink color. The product exhibited stability over a 28-day storage period. Material characterization via X-Ray Diffraction (XRD) identified an amorphous crystal structure (2θ ≈ 25.60 ), while Scanning Electron Microscopy (SEM) revealed a porous surface with a particle distribution of 8μm. X-Ray Fluorescence (XRF) analysis confirmed the extract is rich in macro-elements, specifically Potassium (67.5%), Calcium (15.5%), Magnesium (8.5%), and Phosphorus (8.4%).
Fourier Transform Infrared (FTIR) Characterization of Sulfate Ion Adsorption on One-Pot Synthesized Quaternary Ammonium Polymer Derived from Vinasse Waste Sari, Hutri Puspita; Rahayu, Aster; Cahya Hakika, Dhias; Pramia Lestari, Syahrani
Eksergi Vol 23 No 1
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v23i1.15924

Abstract

Vinasse is a major liquid waste generated from the bioethanol industry and contains a high concentration of sulfate ions that may cause environmental problems if not properly managed. This study investigates sulfate adsorption from vinasse wastewater using a one-pot synthesized quaternary ammonium polymer, with a focus on functional group interactions analyzed by Fourier Transform Infrared Spectroscopy (FTIR). Quantitative adsorption experiments were conducted to confirm sulfate removal, while FTIR analysis was employed to examine changes in functional group characteristics before and after adsorption under various operating conditions. The quantitative results demonstrate that sulfate adsorption proceeds rapidly, achieving a removal efficiency of approximately 87.5534% with an adsorption capacity of 10.6800mg/g at a contact time of 20 minutes under the investigated conditions. FTIR spectra indicate that sulfate adsorption does not alter the main polymer structure and is primarily associated with changes in the intensity of bands related to quaternary ammonium groups and sulfate vibrations, suggesting non-covalent interactions dominated by electrostatic attraction, with possible contributions from hydrogen bonding. Overall, this study provides quantitative evidence of sulfate adsorption from real vinasse wastewater and demonstrates the usefulness of FTIR analysis in elucidating interaction behavior between sulfate ions and quaternary ammonium polymer functional groups.

Page 31 of 31 | Total Record : 305

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