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Eksergi
Published by Universitas Pembangunan Nasional Veteran Yogyakarta
ISSN : 1410394X     EISSN : 24608203     DOI : -
Core Subject : Engineering,
Chemical Engineering, Chemistry & Bioengineering
Eksergi accepts manuscript in Chemical Engineering, with topics: separation in Chemical Engineering, Energy and related to Renewable or Sustainable energy, Process and Production of Chemical Engineering, Nanomaterial particle, Chemical engineering design and process control. All articles published by Eksergi are peer-reviewed. The types of paper considered for publication are original articles in basic and applied research, case studies, and critical reviews.
Arjuna Subject : -
Articles 201 Documents
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Acid Tar Waste Beneficiation Through Blending with Coal Downmore Musademba; David Jambgwa Simbi; Pardon Kusaziwa Kuipa
Eksergi Vol 19, No 2 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i2.6346

Abstract

The possibility of blending acid tar waste with coal as a beneficiation method was explored in this work. It was essential to first establish the material properties of the acid tar and coal samples together with that of the blends in terms of proximate analyses. The acid tar waste to coal blending ratios of 3:1, 1:1 and 1:3 were used. It was observed that acid tar waste exhibited high volatile and moisture content with low ash and carbon content when compared with coal. When compared with coal; a 3:1 blending ratio exhibited 56.9 % and 7.6 % reduction in ash and fixed carbon respectively and on the contrary a 38.1 % increase in volatile matter was observed. An opposite trend was obtained with 1:3 blend ratio. The 1:1 blend ratio was found to decrease the volatile and ash content by 8.3 % and 52.7 % respectively whilst fixed carbon boosted by 4.2 %. The choice for the blending ratio to apply is a trade-off between fixed carbon and volatile matter. If volatile matter is of any significance then a 3:1 mixture would be ideal; such a mixture will aid in easier ignition of coal.  On the other hand a 1:3 binary mixture yields a higher fixed carbon fraction, whose effect is to boost the calorific value of the fuel, an excellent factor for combustion. Overall however, it makes economic sense to blend coal with acid tar waste for enhancing sustainability.
Effect of Alum Dose in the Coagulation Process for Decreasing the Pollutant in the Palm Oil Mill Effluent: Experimental and Kinetic Analysis Iqbal Syaichurrozi; Jayanudin Jayanudin; Listiyani Nurwindya Sari; Anellysha Putri Apriantika
Eksergi Vol 19, No 3 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i3.7405

Abstract

Palm oil mill effluent (POME) is palm oil processing industrial waste that cannot be discharged directly into water bodies. Therefore, this waste must be treated. One method that can be used to treat it is coagulation. The purpose of this study was to investigate the effect of coagulant doses on the coagulation process for treating the POME through experimental and kinetic analysis. The alum dose was varied to 1, 3, 5, 10, 15 g/L. The volume of treated waste was 1 L. Before adding alum, the pH of POME was adjusted to 7.0 with the addition of technical grade NaOH. The coagulation process was carried out for 180 minutes at room temperature. Every 20 minutes, the pH of the liquid was measured and a fluid sample as much as ±50 mL was taken to be settled for 24 hours. Next, the total suspended solid (TSS) concentration in the supernatant was analyzed. The results showed that the addition of alum could decrease the liquid pH and increase the TSS of the liquid. The coagulation process for 180 minutes resulted in a TSS reduction efficiency of 33.3, 33.3, 37.1, 1.7, -17.8% at alum doses of 1, 3, 5, 10, 15 g/L respectively. The first-order kinetic model provided a better prediction than the second-order kinetic model with R2 values of 0.7876-0.9707 and 0.2746-0.8912, respectively.
Fly Ash – Alginate Composites Beads for Rhodamine B Removal Heni Anggorowati; Perwitasari Perwitasari; Indriana Lestari
Eksergi Vol 19, No 3 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i3.8199

Abstract

Dyes are a very serious problem for the environment. Composite beads consisting of fly ash and sodium alginate proved to be an adsorbent to reduce rhodamine b from dye waste. In this study, the effect of the mass of beads (5-45 grams), the pH of the solution (2-11) and the stirring time (0-360 min) was studied. Determination of concentration after adsorption was carried out by UV-Vis spectrophotometer. The maximum reduction in rhodamine b concentration of 31.15% was obtained after the adsorption process for 300 minutes with a mass of 35 grams of beads. The adsorption of rhodamine b is quite sensitive to the pH of the solution and shows the optimum adsorption value at pH 2. Based on the characterization with BET, fly ash – alginate beads include mesopores with a pore diameter of 10 nm, a total pore volume of 5,332 x 10-3 cc/g and a pore surface area. 2,133 m2/g
AIIALISIS TEORI DAN EKSPERIMENTAL PENGUMPUL SURYA DUA-PASS DENGAN MEDIA BERPORI Supranto Supranto
Eksergi Vol 10, No 1 (2010): Versi Cetak
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v10i1.7611

Abstract

The double-pass solar collector with porous media in the lower channel provides a higher outlet temperature compared to conventional single-pass collector. Therefore, the thermal efficiency of the solar collcctor is higher. The solar collector can be used for wide variety of applications such as solar industrial process heat and solar drying of agricultural products. A theorelical model has been developed the double-pøss solar collector. Anexperimental setup has been designed and constructed. Comparison of the theoretical and the experimental results have been conducfecl such comparisons include the outlets temperatures and thermal eficiencies of the solør collector for various design and operating conclitions. Close agreement has been obtained between the theoretical and experimental results.
Adsorption Equilibrium of Methylene Blue By Activated Carbon From Post-Anthesis Male Flower Palm Oil Waste Yuli Ristianingsih; Indriana Lestari; Alit Istiani
Eksergi Vol 19, No 3 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i3.8055

Abstract

Methylene blue (MB) is wastewater from the textile industry. This dye is difficult to degrade naturally because it has a benzene group in its chemical chain. There are several ways to reduce waste, one of the economical ways is by using adsorption. In this study, MB was adsorbed using activated carbon from post-anthesis male flower palm oil (PAMF) waste which was activated using potassium hydroxide (KOH). The adsorption process was carried out at various temperatures (30, 40, and 50℃). The results showed that the addition of a KOH activator could increase the sorption capacity of methylene blue by 25.64%. The optimum temperature is suitable for the adsorption process of methylene blue with activated carbon of PAMF waste activated by KOH at a temperature of 30℃ with an adsorption capacity of 58.4793%. The adsorption equilibrium mechanism was studied using two types of adsorption isotherm models, namely the Langmuir and Freundlich models. Based on the data obtained, the MB adsorption process on activated carbon was compatible with the Freundlich model an R2 of 0.9557.
Pengaruh Katalisator Asam pada Proses Pembuatan Gliserol dari Minyak Kelapa Sawit dengan Metanol Titik Mahargiani; Purwo Subagyo
Eksergi Vol 9, No 1 (2009): Versi Cetak
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v9i1.7584

Abstract

Pengaruh Katalisator Asam pada Proses Pembuatan Gliserol dari Minyak Kelapa Sawit dengan Metanol
Polymerization Styrene dengan Solven Toluena Sri Wahyu Murni; Wasir Nuri; Indriana Lestari; Ani Saraswati
Eksergi Vol 9, No 1 (2009): Versi Cetak
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v9i1.7579

Abstract

Polystyrene is the result of free radical-addition polymerization of styrene monomer with the initiator benzoyl peroxide. This research aims to study the effect of variable temperature and ratio of toluene-styrene (T / S) against the conversion and reaction kinetics of polymerization of styrene with toluene solvent and initiator benzoyl peroxide. This research was conducted in two stages, ie preliminary experiments with test FTIR (Fourier Transform Infra-Red) to prove that the manufacture of polystyrene was successful. Manufacture of polystyrene begins with purifying styrene monomer, and then enter a toluene-styrene (5:1 volume ratio, 5:2, 5:3, 5:4) and 0.2 gram of benzoyl peroxide into a three-neck flask and heated to the desired temperature (60, 70, 80, 90 and 100)oC. Samples were taken every 15 minutes. Each sample is added 0.01 grams of hydroquinone in 10 ml of ethanol and shaken gently to precipitate the polystyrene, then wet samples were weighed, put in oven at 200oC for 1.5 hours. Dried sample was cooled in eksikator then weighed to determine the weight of polystyrene formed. From the experimental results at optimum condition of reaction time of 120 minutes, the temperature of 100oC and toluene-styrene ratio of 5:4, obtained by conversion of 58.75%. The global rate reaction according to equation k' = 5963 exp (-8901 / T).
PEMBUATAN MINYAK KELAPA DARI SANTAN DENGAN CARA ELEKTROKIMIA Titik Mahargiani; I Ketut Subawa
Eksergi Vol 10, No 1 (2010): Versi Cetak
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v10i1.7617

Abstract

Coconut palm is a very usefitl plant. Almost every parts of the tree can be used by people. The most important part is its fruit. From coconut fruit we can get its oil as oil-water emulsion with protein emulsion fier. Coconut oil is the most value part of coconút fruit. Oil content of coconut fruit is 34,7 %. In order to extract its oil front the fruit, we can use electrochemical way. First the fruit make into coconut milk and then coconut milkput inlo electrochemical tool. Electrochemical is a process in which colloid particles are moved under influence of electric current, When a pair of electrodes are given electric current, the protein which has function as a emulsifìer will be destroyed and it causes the separaction oil from wøter. Good relativity condition is reached in : electrochemical time 60 minules, electric current 4 ampere, cathode width 40 cm2 and the coconut oil result is 38.5 ml, the presentage oil result I I % equivalent to 0,01103 mgrek / granr oil free futty acid oil
POLIMERISASI AKRILAMIDA DENGAN METODE MIXED SOLVENT PRECIPITATION MENGGUNAKAN INISIATOR KALIUM PERSULFAT Endang Sulistyawati
Eksergi Vol 10, No 1 (2010): Versi Cetak
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v10i1.7612

Abstract

Poliakrilamida merupakan hasil polimerisasi adisi radikal bebas menggunakan monomer akrilamida dan inisiator kalium persulfat. Polimerisasi ini meliputi tiga tahap, yaitu : inisiasi, propagasi dan terminasi. Metode yang digunakan adalah Mixed Solvent Precipitation dengan campuran pelarut etanol-air. Penelitian bertujuan mengetahui pengaruh suhu dan waktu terhadap konversi, kinetika reaksi dan berat molekulpolimer. Penelitian dilakukan dengan mereaksikan monomer akrilamida dengan campuran pelarut etanol dan air (perbandingan 3:1) serta inisiator kalium persulfat. Reaksi dilakukan pada suhu 40oC, 50oC, 60oC, 70oC dan 75 oC. Dari hasil polimerisasi akrilamida diperoleh persamaan konstanta kecepatan reaksi sebagai fungsi suhu dan pada konsentrasi monomer 20%, suhu reaksi 70oC, waktu reaksi 240 menit diperolehkonversi 58,07% dan berat molekul 61580,83 g/mol.
Potency of Alluvial Mineral of Luk Ulo River with XRD and AAS in Kebakalan Village Kebumen Edy Nursanto; Afroza Pratiwi; Eddy Winarno; Bambang Sugiarto; Riria Zendy Mirahati
Eksergi Vol 19, No 3 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i3.7826

Abstract

Based on petrographic data, XRD, and fluid inclusions, it was interpreted that the quartz veins associated with low sulfide in Karangsambung area underwent 2 stages of system change from mesothermal system to epithermal system. This means showing the mineral potential contained in material, including on the Luk Ulo River where alluvial deposits are present. Therefore, what needs to be done next is to determine the composition of the material of the alluvial material in the Luk Ulo River, Kebakalan Village using XRD, and AAS so that its potential is known. This research is limited to mineral potential in XRD and AAS (Au, Ag, and Cu) in 2 samples, A (sand) and B (rock). XRD results on samples A and B showed that quartz (SiO2) had the highest percentage (30-50%) compared to other minerals. While the results of the AAS tests showed that the highest Au and Ag contents were in sample B and Cu in sample A with total of 19.30 g/ton Au, 8.67 g/ton Ag, and 62.88 g/ton Cu. Meanwhile, the lowest total Au and Ag were in sample A and Cu was in sample B which amounted to Au 11.32 g/ton, Ag 8.67 g/ton, and Cu 34.86 g/ton.

Page 15 of 21 | Total Record : 201

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