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Muhamad Maulana Azimatun Nur
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Prodi Teknik Kimia UPN Veteran Yogyakarta"</span>. Jl. SWK. 104 Lingkar Utara Condong Catur- Yogyakarta (55283)
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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 6 Documents
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Search results for , issue "Vol 23 No 2 (2026)" : 6 Documents clear
Techno-Economic Sensitivity Analysis of Integrated CCS–EOR for a 1,000 MW Ultra-Supercritical Coal-Fired Power Plant in Indonesia Raden Ricko Satriyo; Renanto; Rendra Panca Anugraha; Roudlotus Salwa Aulia; Galuh Ferlianes Lestari
Eksergi Vol 23 No 2 (2026)
Publisher : Prodi Teknik Kimia UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v23i2.16590

Abstract

Coal-fired power plants supply 60% of Indonesia's electricity and are major CO₂ sources. Integrating Carbon Capture and Storage with Enhanced Oil Recovery (CCS-EOR) offers a decarbonization pathway with economic benefits. This study evaluates techno-economic performance of an integrated CCS-EOR system for a 1,000 MW ultra-supercritical coal plant in Indonesia, simulated using Aspen HYSYS V14 automated with Python. A solvent blend of 35 wt% MDEA and 15 wt% PZ was used. Four parameters, minimum approach temperature (10–20°C), CO₂ removal efficiency (85–95%), absorber inlet gas velocity (2–2.5 m/s), and stripper Murphree efficiency (0.4–0.8) were varied across full factorial combinations, generating 162 scenarios. Four optimal scenarios were identified via multi-method optimization and assessed for economic feasibility at pipeline distances of 50–200 km. In the base case (90% removal), the system captured 5.66 million tons CO₂/year, with 28.91% energy penalty, Levelized Cost of CO₂ (LCoC) of -$64.53/ton, and Net Present Value (NPV) of $2.07 billion. CO₂ removal efficiency most influences LCoC, while ΔTmin most affects energy penalty. The Balanced Optimal scenario (LCoC -$65.65/ton, energy penalty 28.75%, NPV $2.20 billion) is recommended and remains viable up to 200 km.
The Effect of Solvent Use on Biodiesel Production from Spent Bleaching Earth (SBE) via Staged In Situ Transesterification Miftahurrahmah; Melysa Putri; Netri Elisma
Eksergi Vol 23 No 2 (2026)
Publisher : Prodi Teknik Kimia UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v23i2.15633

Abstract

This study investigates the effect of solvent and co-solvent systems on biodiesel production from spent bleaching earth (SBE) via staged in situ transesterification. The proposed approach integrates solvent-assisted extraction and transesterification in a staged sequence to enhance oil recovery and fatty acid methyl ester formation from a solid waste feedstock. Methanol–hexane and ethanol–hexane systems were evaluated at various SBE-to-co-solvent ratios and transesterification times. The results indicate that methanol-based systems consistently produced higher biodiesel yields than ethanol-based systems, with optimal performance observed at an SBE-to-co-solvent ratio of 1:3 and a transesterification time of 90 minutes. GC–MS analysis provided chemical evidence of ester formation, revealing the presence of palm oil–derived fatty acid methyl esters, with the highest total methyl ester content (44.74%, area %) obtained under methanol-based conditions at a ratio of 1:3. Overall, the findings highlight the critical role of solvent selection and staged processing in improving biodiesel recovery and ester formation from spent bleaching earth.
Comparative Study of Soxhlet Extraction and Hydraulic Pressing for Biokerosene Production from Rubber Seeds (Hevea brasiliensis) Indah Retno Wulandary; Abubakar Tuhuloula; Meilana Dharma Putra; Dewi Dheana Herman; Anisa Maghfirah; Marliana Hartania; Nur Ainah
Eksergi Vol 23 No 2 (2026)
Publisher : Prodi Teknik Kimia UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v23i2.16489

Abstract

Biokerosene is a renewable alternative to fossil-based kerosene, derived from biological resources such as rubber seeds. This study evaluates the effects of Soxhlet extraction and hydraulic pressing on biokerosene production, including the influence of stirring speed during degumming and the physicochemical characteristics of the product. Rubber seed masses of 50, 75, and 100 g were tested, with degumming conducted at 150 and 300 rpm. The highest oil yield (46%) was obtained using Soxhlet extraction at 50 g. However, superior product quality was achieved through hydraulic pressing at 75 g and 150 rpm, yielding the lowest free fatty acid (FFA) value (4.47 mg KOH/g) and the highest proportion of C10–C16 hydrocarbons (56.54%). The resulting biokerosene exhibited densities of 913.8–929.4 kg/m³ and viscosities of 2.6–3.6 cSt. These findings indicate that Soxhlet extraction is more effective for maximizing yield, while hydraulic pressing produces higher quality intermediates that are better suited for downstream upgrading into aviation fuel.
Optimization of Tannin Removal from Marigold Flowers by Water Extraction as Pretreatment for Lutein Recovery Mukmin Sapto Pamungkas; Sherly Maharani Puspita Sari; Edia Rahayuningsih
Eksergi Vol 23 No 2 (2026)
Publisher : Prodi Teknik Kimia UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v23i2.16512

Abstract

Lutein extraction from marigold flowers (Tagetes erecta L.) with organic solvents is related to the presence of tannin-type phenolic compounds, capable of affecting the quality of food products. Therefore, this study aimed to evaluate the potential of water pretreatment to selectively extract tannins before lutein extraction. The experiment was conducted using water as a solvent for extraction due to its high and low selectivity for phenolic compounds and carotenoids, respectively. The extraction of tannins was investigated with respect to stirring speed, extraction time, and water-to-solid ratio using Response Surface Methodology (RSM) design of central composite. Tannins were extracted in a 1 L beaker at ambient temperature, and total phenolic content (TPC) was measured by spectrophotometry using the Folin-Ciocalteu method. The results showed that the quadratic model predicted the optimum extraction conditions as a stirring speed of 579 rpm, extraction time of 4.6 h, and water–solids ratio of 25 mL g−1 dry weight. At these extraction conditions, the process achieved a predicted TPC of 376.76 mg g−1 dry weight with 75.37% removal of tannin. Additionally, visible spectrophotometry confirmed the selectivity of the water-based extraction, as only 1.7% of the initial carotenoid content was present in the water extract.  
Characterization of Polylactic Acid/Chitosan/Cellulose Nanofibers for Wound Dressing Applications Belinda Laulista; Desy Miftachul; Lilik Suprianti; Tri Widjaja; Aisyah Alifatul Zahidah Rohmah; Citra Yulia Sari
Eksergi Vol 23 No 2 (2026)
Publisher : Prodi Teknik Kimia UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v23i2.16532

Abstract

Effective wound care requires dressing materials that provide physical protection while actively encouraging tissue regeneration. This research investigates the development and characterization of biocomposite nanofiber membranes composed of polylactic acid (PLA), chitosan, and cellulose, synthesized via the electrospinning method at an optimized operating voltage of 20 kV. The study aimed to identify the optimal material ratio that balances mechanical durability with surface wettability. Comprehensive evaluations included Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FTIR), water contact angle (WCA) measurements, and mechanical testing. The results demonstrate that the integration of chitosan and cellulose significantly refined fiber morphology and wettability. The optimal variant with a composition of 90:5:5 wt.% (PLA:chitosan:cellulose) achieved a WCA of 98.64°, indicating that the hydrophobicity was maintained relative to pure PLA. M orphologically, the composite fibers were uniform and bead-less, with a mean diameter reduction of 36.2% (from 517.12 nm in pure PLA to 329.68 nm). FTIR spectra confirmed successful component incorporation through characteristic amide and hydroxyl bands. Mechanically, the composite membrane exhibited a superior synergy between strength and flexibility, achieving a yield strength of 0.06 MPa and a significant elongation at break of 80.36%. These findings suggest that the 90:5:5 formulation successfully bridges the gap between mechanical durability and the high surface area-to-volume ratio required for advanced, biodegradable wound care applications.
Thermodynamic Efficiency Analysis of ORC-VCR Ship Cooling Systems with Low-GWP Fluids Based on Ship Engine Waste Heat Colin Steven Aruan; Fajri Ashfi Rayhan
Eksergi Vol 23 No 2 (2026)
Publisher : Prodi Teknik Kimia UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v23i2.16589

Abstract

The growing demand for efficient onboard air-conditioning systems has encouraged the exploration of alternative energy recovery approaches in maritime operations. In this context, the present work evaluates a hybrid ORC-VCR system that harnesses waste heat from engine exhaust gases and cooling water circuits to support shipboard climate control. A comprehensive thermodynamic framework is established to assess and compare the operational performance of three working fluids: R601, R1233zd, and R1234ze. To enhance overall system effectiveness, an optimization analysis is carried out to evaluate various working fluids and define the operating parameters that enable the highest achievable efficiency. The analysis considers key parameters, including heat source temperature, condensing temperature, as well as hot water mass flow rate levels. Analysis outcomes demonstrate that variations in working fluid selection lead to significant differences in overall efficiency and operational performance parameters. Among the fluids evaluated, R1234ze demonstrates the highest overall performance under the examined operating conditions. In addition, system performance metrics, including output capacity and coefficient of performance, are substantially governed by variations in heat source temperature and condensing conditions. Adjustment of the hot water flow rate effectively controls the evaporator temperature, contributing to system optimization. In summary, performance assessment results indicate that R1234ze offers the greatest efficiency, making it the optimal choice for implementation in the proposed shipboard waste heat recovery system.

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