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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 301 Documents
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Laboratory Core-flooding Test of Surfactant-Polymer Injection Method for Oilfield Production Improvement Dedy Kristanto; Wibowo Wibowo; Hariyadi Hariyadi; Yulius Deddy Hermawan
Eksergi Vol 16, No 1 (2019)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v16i1.2938

Abstract

The utilization of chemical flooding to improve oil production in a large scale has many used for the oil field. Some cases have a success, and the others have fail when full scale project implemented. Before chemical flooding conducted, once of the recommended best practice to be done is chemical compatibility based on the reservoir characteristic of the layer as a target in improving oil recovery. Hence, coreflooding test in the laboratory to be an important thing to conduct in other to knows and determine the chemical performance after screening phase. The study of coreflooding test in the laboratory, shows that the measurement of surfactant and polymer properties have a good results to be used as an injection fluid in other to improve oil production. Surfactant - polymer injection which has concentrations of 3000 ppm and 1000 ppm with injection mechanism of 0.3 PV surfactant and 0.2 PV polymer gives the result of improving oil production it about 12.89%. Furthermore, based on the qualitative analysis obtained that the used of surfactant SS-B8020 as an injection fluid shown that plugging has not occurred in the reservoir rock pores, it means that the injection fluid was compatible with these reservoir rock.
Pemetaan dan Analisis Penelitian Pengurangan Tebal Lapisan film pada Lapisan diffusi gas PEM Fuel Cell Ramli Sitanggang
Eksergi Vol 15, No 2 (2018): Vol. 15 No.2 (2018)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v15i2.2453

Abstract

One way to reduce the cost of making PEM Fuel Cells is to reduce the thickness of the layer. The layer is located between GDL and PEMFC electrode. This layer, to refute the electrode, is expressed with thickness, porosity, pore diameter, active surface area. In this working paper, the results of the thin film research results have been mapped and the results of the tests are to determine the characteristics of the thin layer thickness reduction. The mapping and analysis results were obtained at thicknesses ranging from 250 µm. In testing the thickness of 250 µm can still be reduced by a spray machine of 145 µm with a carbon density of about 2 mg cm-2 , but PEMFC's performance is smaller than the achievement of 250 µm thick.
EFFECT OF pH ON LIQUID-PHASE MASS TRANSFER AND DIFFUSIVITY COEFFICIENT AT LEACHATE TREATMENT OF MUNICIPAL WASTE LANDFILL IN ANAEROBIC BIOREACTOR Abdul Kahar; IDAA Warmadewanthi; Joni Hermana
Eksergi Vol 15, No 2 (2018): Vol. 15 No.2 (2018)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v15i2.2327

Abstract

Leachate is a liquid waste resulted from physical, biological and chemical decomposition of landfill waste. Leachate contains complex dissolved organic and anorganic substrate which are biodegradable and non-biodegradable. Anaerobic treatment principally utilizes anaerobic bacteria in order to degrade the dissolved organic substance into biogas. Anaerobic treatment is very sensitive towards the substrate cocentration, temperature, and pH. This research used anaerobic bioreactor with the volume of 160 L, the ratio of the leachate: biogas is 70:30. Seeding and acclimatization steps were done, respectively for 10 days, leachate treatment was done in 21 days. Seeding, acclimatization, and leachate treatment were done on the pH ambience of 7.2 and 8.0 and ambient temperature. COD and VFA analysis were done every two days. The objective of this research is to decide the pH effect on the coefficient of liquid-phase mass transfer: kL, and the diffusivity of the dissolved substace, DL. pH affects the degradation of the concentratio of dissolved organic substrate in the leachate. The higher the pH is, the higher the obtained VFA concentration is. VFA concentration is affected by pH; however, it still considers the optimal pH condition of the substrate biodegradation. pH affects the average rate of mass transfer, rkL and diffusivity of the dissolved substance, DL in the anaerobic treatment of leachate. pH affect the concentration of dissolved organic substrate which subsequently influenes the coefficient of liquid-phase mass transfer of the leachate, kL and the diffusivity of the dissolved substance, DL. The higher the pH is, the more increasing the kL is and the more decreasing the DL is.
Chitosan Concentration and Cross-linker Volume Effect on The Release Kinetic of Red Ginger Oleoresin Microcapsule in Simulated Intestinal Fluid (SIF) Medium Jayanudin Jayanudin; Moh. Fahrurrozi; Sang Kompiang Wirawan; Rochmadi Rochmadi
Eksergi Vol 16, No 2 (2019)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v16i2.3088

Abstract

Red ginger oleoresin contains components that can be used as antioxidants. Release kinetics studies are used to provide doses to achieve the desired drug concentration. The purpose of this study was to determine the release kinetics of red ginger oleoresin microcapsules based on changes in chitosan concentration and volume of cross-linker and determine the diffusion coefficient of red ginger oleoresin through microcapsule walls. Red ginger oleoresin microcapsules were prepared from a mixture of red ginger oleoresin in chitosan solution and stirred to form an emulsion. After that, it was added to corn oil and stirred again to form a second emulsion. Glutaraldehyde saturated toluene was added dropwise after finished added the 25% glutaraldehyde solution and remains stirred for 2 hours. Red ginger oleoresin microcapsules were separated and washed with petroleum ether and hexane, then dried in an oven. Microcapsules inserted in the release medium (simulated intestinal fluid) without enzymes, and then the samples were analyzed using a UV-vis spectrophotometer to determine the absorbance. The release kinetics models used were zero order, first order, Higuchi, Korsmeyer-Peppas, and Hixon-Crowell. The highest correlation coefficient (R2) was obtained from the Korsmeyer-Peppas release kinetics model, R2 = 0.73-0.85 with the value of n = 0.39-0.41. Based on the n value, the release mechanism of red ginger oleoresin microcapsules was Fickian diffusion. The diffusion coefficients obtained were 2,807 x 10-13 - 3,675 x 10-13 cm2 /sec.
Penumbuhan ZnO Rods Terdoping CeO2 Pada Substrat Kaca Menggunakan Metode Hidrotermal Rina Dewi Mayasari; Yuliani H; Deni Y; Masmui M; Raharjo J; Nuryadi R
Eksergi Vol 16, No 2 (2019)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v16i2.2805

Abstract

Pure and cerium oxide (CeO2)-doped zinc oxide (ZnO) rods have been successfully grown on glass substrates using hydrothermal method. Growth of ZnO nanorods has two main processes, i.e. deposition of seed layer and growth of rods. The concentration ratios of Ce/ZnO are of about 1%, 5%, and 10%. The effect of CeO2 dopan on the structural and morphology of ZnO nanorods were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersion X-ray (EDX), and Fourier transform infrared (FTIR). The XRD spektrum on pure and CeO2-doped ZnO rods have hexagonal wurtzite structure with three highest peaks on the lattice of (100), (002), and (101), and face-centered cubic CeO2 phase on the lattice of (111) and (200). Analysis result of SEM confirmed that pure and CeO2-doped ZnO rods formed agglomeration of hexagonal flower-like rods. The addition of CeO2 shifted ZnO peaks of FTIR spectrum from 729 cm-1 to ~780 cm-1 .
Pemanfaatan Serbuk Kayu Pohon Gayam (Inocarpus Fagiferus) sebagai Bio Adsorbent Penjerap Ion Logam Berat Pb(II) dalam Limbah Cair Tintin Mutiara; Jefri Dimas Aziz; Muhammad Gustav Irsack
Eksergi Vol 17, No 1 (2020)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v17i1.3095

Abstract

Tahitian chestnut (Inocarpus fagifer) was utilized as adsorbent to eliminate heavy metal ions in wastewater. In this research, Tahitian chestnut wood sawdust was chemical modified by alkali solution from potassium hydroxide and sodium hydroxide to enhance the adsorption capacity of the sawdust. Furthermore, the effect of pH solution and soaking time to the adsorption capacity of Tahitian chestnut wood sawdust was investigated. Based on the experiment data, it can be concluded that the kinetic of adsorption Pb(II) ions onto the adsorbent Tahitian chestnut wood sawdust was well illustrated by Lagergren 2 nd order mathematic model with the value of determination coefficient (R2 ) was 0,9496.
PREPARASI KARBON BERPORI DARI LIMBAH AMPAS KOPI SEBAGAI MATRIKS PADA PEMBUATAN SLOW RELEASE FERTILIZER Diana Diana; Nur Indah Fajar Mukti; Fakhri Fachreza; Irfansyah Irfansyah
Eksergi Vol 17, No 1 (2020)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v17i1.3097

Abstract

Urea is one of the fertilizers that are widely used in agriculture. However, the absorption efficiency of urea for plants is currently only around 30%. Therefore, to increase its absorption in plants it is necessary to control the release of urea by making it a Slow Release Fertilizer (SRF) fertilizer. The use of SRF is expected to control the release of nutrients according to the time and amount needed by plants. Natural material which has the potential as a matrix of SRF fertilizer is coffee grounds waste. This research produces carbon from coffee pulp waste which can be used as a matrix in the manufacture of urea SRF fertilizer. With the addition of a matrix of coffee carbon is expected to slow the rate of release of urea into nature. So that the process of absorption of urea into plants will be more leverage. Coffee pulp was pyrolysed with pyrolysis temperature variation (400 - 600oC) using ZnCl2 as activator. The iodine number value of coffee grounds carbon produced decreases with increasing temperature. The addition of carbon coffee grounds can inhibit the release of urea from 81.5% to 26% for 30 days.
Enhancing coal tailing quality by Flotation Method using Biosurfactant from Lerak (Sapindusrarak De Candole) Danang Jaya; Tunjung Wahyu Widayati; Refina Yuni Mustika; Halim Nur Aziz Suwardi
Eksergi Vol 17, No 1 (2020)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v17i1.3298

Abstract

Wasted from coal mining that mixed with the wasted of the coal washing product called Coals Tailing (CT) has a low calorific value,high sulfur and ash content. To upgrade its quality by increasing its calorific value and to reduce environmental pollution by reducing sulfur and its ashes, coal must improve from its impurities, one of which is to try with flotation method. Flotation is a process that describes solids that occur due to differences in surface properties (surface properties). The flotation process takes place in a system consisting of three phases, namely gas phase, liquid, and solid, which are interrelated to complete the appearance (with the help of flotation agent  /  surfactant)  so  that  discussion  occurs  between  the  hydrophobic  component  (waterproof)  and  the hydrophilic component (like water). The main objective of the research is to improve the quality of coals tailing (CT), by increasing the calorific value (reducing the content of sulfur, ash, and other impurities) using the flotation method, and using lerak (Sapindus rarak De Candole) as a surfactant. From this research show that an optimal conditions were obtained, at particle size of -80 / + 100 mesh, operating conditions at pH 6, calorific value increased from initially 3230,171 cal/gr to 5035,622 cal/gr, sulfur content decreased according to   the optimum condition reached 2026.08 mg /kg, and the ash content decreased from 54.61% to 33.9%. From the results of these research indicate, Lerak as a surfactant is is enhanced to improve the quality of Tailings Coal (CT) by flotation method.
Steam Distillation of Essential Oil from Lemongrass (Cymbopogon citratus) using Microwave Pretreatment Sri Wahyu Murni, Ir., MT; Tutik Muji Setyoningrum; Gogot Haryono
Eksergi Vol 17, No 1 (2020)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v17i1.3300

Abstract

Essential oils from lemongrass (Cymbopogon citratus) containing citral are very potential to be used in food and pharmacy industries. The process of isolating essential oils is still constrained by its low yield. In order to increase yield, in this research, isolation of essential oil by steam distillation method was carried out using microwave pretreatment. The results showed that pretreatment using microwave for 2 minutes had the effect of increasing yield up to 1.4 times compared to without pretreatment. The essential oil produced using microwave pretreatment had physical properties (colour, odor, density, and refractive index) similar to those without pretreatment. Composition analysis by GC-MS showed that essential oils extracted using microwave pretreatment and without pretreatment contain geranial (Ecitral or citral-a), neral (Z-citral or citral-b) and mircena as the main components.
Design of a Simple Pyrolysis Reactor for Plastic Waste Conversion into Liquid Fuel using Biomass as Heating Source Aditya Kurniawan; Bambang Sugiarto; Andri Perdana
Eksergi Vol 17, No 1 (2020)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v17i1.3080

Abstract

A design that emphasizes simplicity and cost-effectiveness is applied to the plastic pyrolysis reaction system to produce liquid fuel. The reactor is fabricated from the waste refrigerant tank. The energy source for pyrolysis is generated by the combustion of biomass pellets. Forced convection by an electric blower is utilized to enhance the combustion efficiency and thus increase the heating rate with the overall average temperature at 412 °C. The coiled pipe is employed as a condenser system with water as its cooling media. The quantity of liquid product is measured for a different mass of PET-type plastic waste feed, with a maximum value of 17.7% w/w of feed mass is obtained. The physical characteristic of the liquid product is then analyzed using standard methods. It is found that its characteristics have approached the specification of commercial liquid fuel in the domestic market, with a liquid specific gravity of 0.776 and a heating value of 46 MJ/kg.

Page 8 of 31 | Total Record : 301

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