cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Muhamad Maulana Azimatun Nur
Contact Email
lanaazim@upnyk.ac.id
Phone
-
Journal Mail Official
editor.eksergi@gmail.com
Editorial Address
Prodi Teknik Kimia UPN Veteran Yogyakarta"</span>. Jl. SWK. 104 Lingkar Utara Condong Catur- Yogyakarta (55283)
Location
Kab. sleman,
Daerah istimewa yogyakarta
INDONESIA
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
 12   13   14   15   16 
Oksidasi Larutan Kalium Thiosulfat dalam Ekstrak Abu Tandan Sawit dengan Udara Gogot Haryono
Eksergi Vol 9, No 1 (2008): 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.v9i1.7555

Abstract

Potossium sulphate is a kínd offertilizer whích nowadrys is still imported. The efortþr producing itfromdiferentfeedstockwås irwestigatedby many researchers. ThÍs researchwas an ahernativeway toproducepotassium sulphatefrom ash of empty palm-bunch. This objective ofthis researchwas particularly to studythe kinetic ofoxidationreaction ofpotassium sulphate productionfrom actract of ash ofempty palm-bunch,The æperíment was conducted by/ìlling the reactor with a potassium thiosulphate solution and thereþrebubbling air from bottom of the reactor with specitìed flow røe until steady condition was attained Theproductwas ønd analyzed at several certain time intervals. Iodometric methodwas appliedþr thiosulplwteanalysis and grartimetric method for sulphate analysis The øcperimental results showed that oxidationreaction rate of thiosulphate to sulphate was controlled by the reaction step, Temperature dependence ofthe rate constant consìdered by Arrhenius'
Simulasi Enhancement Factor untukAbsorpsi Gas disertai Reaksi Kimia Reversibel Orde Dua Kondisi Non Isotermal dengan Model Difusitas Eddy Yunita D Indrasari; Koatlely Serpara; Ali Altway
Eksergi Vol 9, No 1 (2008): 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.v9i1.7549

Abstract

Proses absorpsi gas ke dalam liquida seríngkali dijumpai dalam dunia industri. Proses ini dilakukan untuk memisahkan suatu komponen yang tidak diinginkan dan untuk mendapatkan suatu senyawa yang merupakan hasil reaksi. Proses absorpsi di industri.umumnya adalah absorpsi secara kimia yang dilakukan dalam packed column atau bubble column dengan aliran counter current. Reaksi kimia dapat terjadi secaraineversibel atau reversibel. Pada kondisi nyatq proses absorpsi gas terjadi pada kondisi non isotennal yang sangat dipengaruhi oleh panas pelarutan gas. Pengaruh panas dan reaksi kimiaterhadap laju absorpsi dinyatakan dengan enhancement factor. Beberapa penelitian terdahulu tentang enhancement factor untuk absorpsigas pada kondisi non isotermal terbatas pada pemakaian model film dan model higbie. Model film cukup sederhana namun kurang realistis dengan asumsi film stagnan. Model higbie cukup realistis namun melibatkan persaamaandifusivitas unsteady state yang rumit. Pada simulasi ini penelitian dikembangkan dengan model difusivitrs eddyuntuk reaksi orde dua. Model ini cukup realistis namun sederhana. Tujuan dari penelitian ini adalah permodelan matematis untuk menentukan faktor peningkatanabsorpsi gas dalam larutan yang disertai reaksi reversibel orde dua dalam kondisi non isotermal dengan model difusivitas eddy. Penelitian dilakukan secara teoritis dengan simulasi menggunakan program matlab dimana perumusan harga enhancement factor diturunkan dari persamaan dasar absorpsi dengan menggunakan model difusivitas eddy. Harga-harga variabel yang ditinjau pada penelitian ini adalah perbandingan rate difusi A terhadap rate difusi B (S) 0.01 0.0125, bilangan hatta 0 antara I 100, energi aktivasi difusi 0 4 -2 ,energi aktivasi reaksi 0 5, energi aktivasi pelarutan 0 0 - 1.5, panas pelarutan 0 dan panas reaksi 0 0.001 0.003, konstanta kesetimbangan (K) 10 - 15, ratio konsentrasi (L) 100, dan ratio difusi (T) LReynolds number 5000 (Tak berdimensi). Dari penelitian yang telah dilakukan didapatkan bahwa harga enhancement factor dipengaruhi oleh harga S dan bilangan hatta. Semakin besar bilangan hatta cenderung akan mempercepat laju absorpsi. Dan diperoleh bahwa dengan model difusivitas eddy, harga enhancement factor yang didapatkan lebih besar daripada dengan menggunakan model film. Panas kelarutan, panas reaksi, dan energy aktivasi memiliki andil tersendiri dalam mempengaruhi harga enhancement factor.
Kinetika Pengolahan Limbah Cair Industri Tahu secara Biologi Menggunakan Biofilm dengan Sistem Batch Danang Jaya; Endang Sulistyawati
Eksergi Vol 9, No 1 (2008): 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.v9i1.7543

Abstract

Industri talru menghasilkan limbah cair yang bersifat biodegradable sehingga dapat diurai secara biologi dengan menggunakan mikroorgaínsme. Penelitian ini mempelajari kìnetika pertumbuhan bakteri Bacillus sphaerícvs dalam limbah cair orgonik tahu. Penelítían diløkukan dengan mengembangbiakkan bakteri Bacílllussphaericas dalam larutan 5,5 gram  nuttrìen Agar dan l00mL aquades selama 44jam, dimasukkan kedalam 500 mL limbah cair tahu yang berisi 20 buah batu apung. Setiap selang waktu I atau 2 jam, diømbÍl I buah batu apung dan I0 mL substrat untuk diamatí absorbansinya menggunakan spectronic 20", sehingga dþerclehkonsentrasi bakleri dan konsentrasi substrat (dalam mg/mL). Parameter yang dipelajari adalah pengruh perubahan pH pada air limbah terhadap konstanta kecepatan pertumbuhan bakteri. Dari hasil penelitîan didapat nilai konstanta laju pertumbuhan spesifik keadaan jenuh (0.403 / jam), dan yield terbesar (0.593) pada pH7,5 yang merupakan pH optimum pertumbuhan bakteri Bocillussphaericus.
Mass Transfer Coefficient Extraction of Oleoresin from Zodia Leaf (Evodia suaveolens) with Ethanol Solvent Using Ultrasonic Cleaner Siswanti Siswanti; Ratri Saviatri; Jeremy Adi Pratama
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.v19i2.7286

Abstract

The Aedes sp mosquito is a vector of Dengue Hemorrhagic Fever (DHF) and chikungunya which are still commonly found in Indonesia. To control DHF, natural insecticides from plants can be used. Zodia plants (Evodia suaveolens) can be used as natural insecticides because they contain essential oils that mosquitoes do not like. To obtain oleoresin with optimal quality and quantity, extraction can be carried out using ultrasonic waves. To design an efficient extractor, mass transfer coefficient data is needed. Until now, the data is still difficult to obtain. The experiment was carried out using an ultrasonic cleaner, by observing the concentration of oleoresin for various leaf mass ratios of 4, 6, 8, 10, and 12 grams, extracted with 300 mL ethanol for 900 seconds. Concentration observations were also carried out for a time variation of 90 - 900 seconds, with 90 seconds intervals. The best extraction results were tested using GC-MS, to determine the components in the oleoresin. To determine the mass transfer coefficient (Kc) is to make a relationship between concentration and time for the best ratio of leaf weight and ethanol volume.Based on research that has been done with 300 mL of ethanol and extraction time of 900 seconds, the highest concentration was 0.0120 gr/mL, for the experiment using a leaf weight of 12 gr. The largest percentage (%) of oleoresin that could be extracted was 88.5%, for the experiment the leaf weight was 2 g. The optimum mass transfer coefficient (Kc) is 0.161088 1/minute. These data were obtained for the experiment of the relationship between concentration and time. Oleoresin from Zodia leaves contains 20.61% nerolidol. This compound has effectiveness as a mosquito repellent.
Modulus Patah dan Penyerapan Air pada Genteng Beton dari Tbas, Batu Apung dan Kapur Padam dengan Variasi Wasir Nuri
Eksergi Vol 9, No 1 (2008): 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.v9i1.7556

Abstract

Di Indonesiaîerdapat sumber dryø alamyang cakup baryak antara lain tras, batu apung danbatu kapun bahan tersebut dapat digunakan sebagaí bahan bangunan, jika ketiga bahan tersebatdicampur dan dítambah air maka akan menjadi keras dan cuhrp htat dígunakon sebagai bahan bongunan.Penelitían ini bertujuan mencari modulrc patah dan penyerapan air yang memenuhí Standard InùtstriIndonesia pada genteng beton dari campuran tras, batu apung dan kapur padam dengan varíasikomposisi. Campuran tras dan kapur pødamr dengan perbandingan 10 : 4 ditambah batu apung dengankomposisi bemaríasi dari nol sompaí dengan 42,5 prosen berat, dengan ukuran diameter butir lolosayakan 100 mesh dan 200 mesh, campuran ditambah aír sambil diaduk sampaí adonan menjadi plastßhemudíandicetakdenganukuranT,Sx6,6x2cm,sEnplekemudíandiperamselama2l hari,setelahkzringselaniunya dilalwkan uji terhadap modulus pøtah dan penyerapan ain Hasíl uji terhadap modulus pøahmalrsimum adalah 10,2 kg / cm'1 pada ukuran butir 200 mesh sedangkan peresapan terhadap aìr minimumadalah0,l6 gramper cm'padaukuranbutir I00meshdalamwaktu2t hari. Moduluspatah-danperesapanaír masih dibautah standart SII sebagai genteng beton, sehingga perlu penelitian lebih lanjut misalnyawaklu pemeraman atau ditambahkan semen Portland.
LAJU PERTUMBUHAN MIKROBIA PADA PENGOLAHAN LIMBAH CAIR TEMPE MENGGUNAKAN SISTEM BIOFILM Endang Sulistyawati; Gunarto gunarto
Eksergi Vol 9, No 1 (2008): 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.v9i1.7552

Abstract

Límbah cair industri tempe bersifat biodegradable, sehingga dapat diuraí secara biologi. Pengoløhanyang dÍcobakan adalah sistem biofilm. Percobaan dilakukan dengan mengembangbíakkan Bakteri Bachillus Sphaericus menggunakan nutrisi MRS Broth dalam aquades dan media biofìlm batu apung yang dimasukkan dalam limbah. Laju pertumbuhan bakteri diamati pada variasi suhu 29C, 40C, 50C dan 60C pada fase pertumbuhan cepat. Hasil analísís data dengan pendekatan bahwa reaksi yang terjadimengikuti reaksi katalitik orde satu diperoleh persamaan laju pertumbuhan mikroba sebagai fungsi suhu sebagai r= 1,75 x 10^8 e^(-13.2/RT)xS.
Sintesa Kalsium Karbonat Presipitat Carnila D Ariono
Eksergi Vol 9, No 1 (2008): 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.v9i1.7545

Abstract

Calcium carbonate is one of the chemical substances, which is largely used in chemical industries such as coating and fìlters in paper, toothpaste, paint etc. Based on bulk density, this substance is classified into two kinds, which are light and heavy calcium carbonate. The need of calcium carbonate especially the light type is increased with the development of the chemical industries, but the domestic production of calcium carbonate cannot fulfill this need, so still needs to be improved. Precipitated calcíum carbonate (PCC) is the light type of high purity of calcium carbonate which is yielded from precipitation processes. Lìght PCC has intenal bulk density between 0,15-0.60 g/cm'. Synthesis of PCC from límestone consist of calcination, hydration and carbonation processes. In the calcination process, Iimestone is burnt in a high temperature to form CaO. The calcination process is usually done by the small scale industry. In the hydration process, CaO react with water to form Ca(OH), solution. Then in the carbonation process, Ca(OH),react with CO2 to form light PCC.The experíment is focused in hydration and carbonatation processes has purpose to learn the ffict of ratio of CaO/HrO during hydration process and the effect of CO2, dilution by N, gas flow rate during carbonøtion process against percentage of CbaO converted to PCC. The result of this experiment are (l) maximum conversion of CaO to PCC is 50% and (2) the quality of product light PCC has fulfilled the specification for paper filler
Produksi Poli-β-hidroksibutirat (PHB) Menggunakan Bakteri Bulkhoderia cepacia Sri Wahyu Murni; Gunarto Gunarto
Eksergi Vol 9, No 1 (2008): 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.v9i1.7557

Abstract

Plastics have important roles nowadays. However, its non-biodegradable property potentially makes a great problem because of the accumulation of its waste. Therefore, many researches about biodegradable plastics have been developed. Poly-β-hydroxybutyrate (PHB) is an alternative material to produce biodegradable plastics. The objectives of this research are to study the production of PHB by using Bulkhoderia cepacia bacteria and soluble starch substrate and determine the kinetics parameters including maximum specific growth rate (μmaks), saturation constant (Ks), and yield ratio of product-to-bacterial cell (YP/X). Fermentation was conducted at room temperature by using Ramsay medium with soluble starch at certain concentrations. The starter of Bulkhoderia cepacia incubated for 24 hours was inoculated as many as 10% by volume. The PHB product and dry cell weight were analyzed at certain several time intervals. This experiment was repeated at variation of phosphate concentrations.This research showed that the optimum cell growth and PHB production was obtained at soluble starch concentration of 8 g/100 ml and growth period of 72 hours. At this condition, the results were the dry cell weight of 7.5 mg/ml and PHB concentration of 0.0095 mg/ml. The values of kinetics parameters were μ maks of 0.01292 g/ml. h, Ks of 0.2854 g/ 100ml, YP/X of 0.00143. The accumulation of PHB was optimum at limited phosphate concentration. It could be also concluded that Bulkhoderia cepacia was a non-effective bacteria to produce PHB.
KOEFISIEN TRANSFER MASSA PADA PENGAMBILAN MINYAK ATSIRI KAYU MANIS SECARA EKSTRAKSI MENGGUNAKAN PELARUT N-HEKSAN Tunjung Wahyu Widayati; Tutik Muji Setyoningrum
Eksergi Vol 9, No 1 (2008): 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.v9i1.7551

Abstract

Pada proses ekstraksi dìiumpai-peristiwa perpindahan (transfer) massa, dimana perbedaan konsentrasi yørg semakin besar berpengaruh terhadap proses transfer yang semakìn cepat, sehíngga diperoleh koefisien transfer massayang semakìn besar pula. Teknologi mínyak atsiri berkembang sangat pesat, sèhíngga díbutuhkan alat ekstraktor yang efìsíen dan efektif dalam pengoperasiannya.Tuiuan dari penelitian ini adalah untuk mencari hubungan antara kecepatan alíran dan tinggì tumpukan padatan terhadap koefìsien transfer massa pada ekstraksí padat-caír dalam kolom fixed-bed. Penelitian ini menggunakan serbuk dengan ukuran -/,8 + i0 mesh dari daun dan ranting køyu mønis dengur tinggì tumpukan tertentu yang dimasukan ke dalam kolom fixed-bed menggunakan-Heksan yang d¡alirkan kedalam kolom dengan kecepatan alír tertentu. Ukuran butiran kayu manis yang digunakan adaiah 18+30 mesh.Kecepatan aliran n-Heksana yang digunakan adalah 2,3829 cm/detik; 2,9197 cm/detik; 3,9932 cm/detik; 4,3957cm/detik; 4,798 cm/detik. Tinggi tumpukan padatan yang digunakan adalah 5 cm, 6 cm, 7 cm, I cm, g cm, I0 cm.
Model Matematika dan Simulasi Untuk Non-Idealitas Reaktor Alir Pipa Gunarto Gunarto
Eksergi Vol 9, No 1 (2008): 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.v9i1.7546

Abstract

This paper presents a mathematical model for the performance of a non-ìdeality plugflow reactor. An analytical technique used was the residence time distribution (RTD) involving tracer component. This model can give a prediction of the number of the ideal continuous stirred tank reactors that could represent the non-ideal plug flow reactor. Regardíng to the literature, the result obtained is 9 continuous stirred tank reactors in series would represent the performance of non-ideal plugflow reactor that was analyzed

Page 14 of 31 | Total Record : 301

 12   13   14   15   16 

Filter by Year

2008 2025


Reset
Filter By Issues
All Issue Vol 22 No 3 (2025) Vol 22 No 2 (2025) Vol 22 No 1 (2025) Vol 23 No 1 Vol 21, No 3 (2024) Vol 21 No 3 (2024) Vol 21 No 2 (2024) Vol 21, No 2 (2024) Vol 21 No 1 (2024) Vol 21, No 1 (2024) Vol 20, No 3 (2023) Vol 20 No 3 (2023) Vol 20, No 2 (2023) Vol 20, No 1 (2023) Vol 19, No 3 (2022) Vol 19, No 2 (2022) Vol 19, No 1 (2022) Vol 9, No 1 (2008): Terbitan lama Vol 18, No 1 (2021): Vol 18, No. 1 (2021) Vol 18 No 2 (2021) Vol 18, No 2 (2021) Vol 18, No 1 (2021) Vol 17, No 2 (2020): Volume 17 No 2 (2020) Vol 17, No 2 (2020) Vol 17, No 1 (2020) Vol 16, No 1 (2019): Vol.16 No.1 (2019) Vol 16, No 2 (2019) Vol 16, No 1 (2019) Vol 15, No 2 (2018): Vol. 15 No.2 (2018) Vol 15, No 1 (2018): Vol 15, No 1 (2018) Vol 14, No 2 (2017): Eksergi Volume 14 No 2 2017 Vol 14, No 1 (2017): Eksergi Volume 14 No 1 2017 Vol 13, No 2 (2016) Vol 13, No 1 (2016) Vol 12, No 2 (2015) Vol 12, No 1 (2015) Vol 10, No 2 (2010): Terbitan Lama Vol 10, No 2 (2010): Versi Cetak Vol 10, No 1 (2010): Versi Cetak Vol 9, No 1 (2009): Versi Cetak Vol 9, No 1 (2008): Versi Cetak Vol 11, No 2 Vol 11, No 1 More Issue