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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 298 Documents
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Biosurfaktan Reningtyas, Renung; Mahreni, M
Eksergi Vol 12, No 2 (2015)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v12i2.1354

Abstract

Surfactant is an amphipilic chemical structure which contains the hydrophobic and hydrophilic groups. Surfactant has ability to lower surface tension between two liquids. Surfactant has been used in many industries, such as cosmetics, food, textile, petroleum, and pharmacy industry. Nowdays, most of surfactant used in industries are still based on petroleum resources. The applicationsof this nonbiodegradable surfactant in industry promote environmental problem. Biosurfactant is a biodegradable surfactant that produced from microorganism or natural resources. Biosurfactant produced from microorganism contains Rhamnolipid and Lipopeptide. Surfactin and Dactomicin made from microorganism with antibacterial activity are the examples. Bottle necks of the production of biosurfactant form microorganism are their slow process, high purification cost, and high product price. Biosurfactant from natural resources are potentially produced in large scale due to their fast process and relatively cheap raw material. Metil Ester Sulphonate (MES) is one of biosurfactant produced from natural resources (from palm oil). The other example is biosurfactant from esterification of carbohydrate and carboxylic acid. This paper reviews the literatures dealing with biodegradable surfactant development which can be used as a reference of a research path way and an industrial scale production of biodegradable surfactant.
Produksi, Karakterisasi, dan Isolasi Lipase dari Aspergillus niger menggunakan Minyak Goreng Sawit sebagai Induser Sri Wahyu Murni; Siti Diyar Kholisoh; Tanti D.L.; Petrissia E.M.
Eksergi Vol 12, No 1 (2015)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v12i1.1034

Abstract

The objective of the research was to produce, isolate and characterise lipase from Aspergillus niger, and therefore inducted it by using palm oil. The lipase enzyme was produced through a batch fermentation process in a 1.4 liters-fermentor. Fermentation was carried out at room temperature, initial pH of 7, the stirring speed of 250 rpm, aeration rate of 1 vvm, and inducer concentration of 3%-m/v palm oil/ml. Enzymes was characterised at several temperature and pH variations. The lipase showed the optimum performance at pH of 7 and temperature of 30 °C with the activity of 1.5 U / ml. Isolation of lipase yielded a 4-times-increase in its activity by using 90% ammonium sulfate.
Ekstraksi Sederhana Antosianon dari Kulit Buah Naga (Hylocereus polyrhizus) sebagai Pewarna Alami Sri Sudarmi; Purwo Subagyo; Anna Susanti; Anggun Sri Wahyuningsih
Eksergi Vol 12, No 1 (2015)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v12i1.953

Abstract

Natural dyes can be obtained from the pigments that contained from leaves, fruit, and rind of the plants. Dragon fruit peel is one of the potential  natural pigment source. Almost 30-35% of the peel fruit is often simply thrown away as trash. Dragon fruit peel  provides natural red color produced by pigment called anthocyanin which can be used as a subtituent from synthetic dyes to natural dyes. This research was objected to find the optimum conditions for anthocyanin extraction of dragon fruit peel. Simple extraction was carried out by using 80% ethanol solvent with  variable ratio of the amount of material and solvent (1: 9 to 1:13), temperature (50◦ to 80◦ C) and time (1 to 5 hours). Optimum result was obtained from a ratio F: S 1:11, temperature 50◦C, for 3 hours.
Pengaruh Penambahan Vermiculite Termodifikasi Cu2+ sebagai Media Imobilisasi Bakteri Anaerob pada Produksi Biogas terhadap Parameter Kinetika Gregorius Prima Indra Budianto; Wisnu Arfian Anditya Sudjarwo
Eksergi Vol 14, No 2 (2017): Eksergi Volume 14 No 2 2017
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v14i2.2138

Abstract

Modifikasi vermiculite dilakukan untuk meningkatkan afinitasnya sebagai media imobilisasi bakteri anaerob. Penelitian ini bertujuan untuk mempelajari pengaruh vermiculite termodifikasi Cu2+ dalam proses produksi biogas terhadap parameter kinetika. Penelitian ini dilakukan menggunakan tiga digester, yaitu digester tanpa penambahan vermiculite termodifikasi Cu2+, digester dengan penambahan vermiculite termodifikasi Cu2+ 0,01 mg/L dan digester dengan penambahan vermiculite termodifikasi Cu2+ 0,5 mg/L. Hasil yang diperoleh adalah semua digester dengan penambahan vermiculite termodifikasi Cu2+ sebanyak 40 g memberikan peningkatan pada nilai laju pertumbuhan spesifik bakteri asidogen  dibandingkan dengan digester tanpa penambahan vermiculite termodifikasi yaitu sebesar 48 %. Penurunan laju pentumbuhan spesifik bakteri metanogen hanya terjadi pada digester dengan penambahan vermiculite termodifikasi Cu2+ 0,5 mg/L hingga  88,87 %.
Robotic spraying application for Fabrication Proton Exchange Membrane Fuel Cell Ramli Sitanggang
Eksergi Vol 13, No 2 (2016)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v13i2.1694

Abstract

One of the processes that work in the field of engineering Proton Exchange Membrane Fuel Cell (PEMFC) is to produce a variety of designs MEA. The best design will be found in the manufacturing process. The project introduced a spray with a robotic instrument configuration x-y axis to issue MEA design. MEA layer forms which can be produced by this spray will follow a periodic function, whereas the layers including the thickness, porosity, pore diameter, specific active surface area which will be used to hold the chemical reaction to produce electricity. The character size coating layer is represented by the amount of spraying. This number is a function of the frequency of the robot, and the nozzle crosses the x-y dimensions of the substrate. Sprays produce two forms of MEA design. From the results of this study MEA quality can be assessed using a robot with a spray nozzle configuration as a contribution for Fuel Cell (PEMFC).
The Effect of Ratio of Formaldehyde/Urea (F/U) using Catalyst of NaOH and NH4OH against Production of Urea-Formaldehyde Resin in Laboratory-Scale Syaichurrozi, Iqbal
Eksergi Vol 13, No 1 (2016)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v13i1.1610

Abstract

This study was conducted to investigate the ratio of formaldehyde/urea (F/U) and catalysts against the formation of urea-formaldehyde resin. The F/U was varied in 1.5, 2, 2.5, 3. The catalysts used were NaOH and NH4OH. The results showed that density of urea-formaldehyde resin at F/U of 1.5, 2, 2.5, 3 was 1360, 1370, 1360, 1330 kg/m3 in using catalyst of NaOH and1370, 1370, 1350, 1350 kg/m3 in using catalyst of NH4OH. Meanwhile, the absolute viscosity of urea-formaldehyde resin at F/U of 1.5, 2, 2.5, 3 was 0.007347672; 0.007723512; 0.007347672; 0.006873174kg/m.s in using catalyst of NaOH dan 0.00879; 0.00827; 0.00813; 0.00643 kg/m.s in using catalyst of menggunakan NH4OH. Resin formed (%)at F/U of 1.5, 2, 2.5, 3 was 25.92; 30.19; 28.85; 25 % in using catayst of NH4OH dan 10.71; 11.6; 9.45; 14.28  % in using catalyst of NaOH.
Pengaruh Variasi Komposisi Pada Campuran Limbah Cair Aren dan Kotoran Sapi Terhadap Produksi Biogas Ramdiana, Ramdiana
Eksergi Vol 14, No 2 (2017): Eksergi Volume 14 No 2 2017
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v14i2.2139

Abstract

Limbah cair aren dan kotoran sapi merupakan substrat yang baik dalam pembuatan biogas, karena tanaman aren mengandung bahan organik yang tinggi dan kotoran sapi mengandung bakteri penghasil gas metan. Nilai rasio C/N dari limbah cair aren yaitu 15 dan  perlu dicampur dengan limbah yang memiliki rasio C/N lebih tinggi dari kotoran sapi yaitu 24. Penelitian dilakukan dengan proses anaerobic reactor. Penelitian ini menguji 5 variasi komposisi campuran kotoran sapi dan limbah cair aren yaitu 1 : 0,25, 1: 0,5, 1 : 0.75, 1 : 1 dan 1: 1,25. Masing-masing sampel dimasukkan ke dalam digester  dengan kapasitas 14 liter terdiri dari 11 liter campuran limbah dan 3 liter air, kemudian diinkubasi secara anaerob dalam ruang bersuhu antara 25oC – 30oC selama 50 hari. Parameter yang diukur berupa volume biogas, gas metan, nilai C/N rasio, pH dan suhu. Pengamatan volume gas dilakukan setiap hari dengan menggunakan gas holder dan konsentrasi gas metan diuji dengan Gas Chromatography (GC).  Hasil penelitian menunjukkan bahwa komposisi campuran kotoran sapi  dan limbah cair aren 1:1,25 menghasilkan biogas tertinggi dengan kadar gas metan 42%.
PENGARUH TINGKAT KEASAMAN PADA KARAKTERISTIK ZEOLIT ALAM SEBAGAI ADSORBEN AMMONIUM HIDROKSIDA (NH4OH) Nur Indah Fajar Mukti
Eksergi Vol 14, No 1 (2017): Eksergi Volume 14 No 1 2017
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v14i1.2006

Abstract

Natural zeolite is a mineral that are widely available in Indonesia. Among many other benefits, the natural zeolite can be used as an adsorbent to reduce water pollutant caused by ammonia compounds and combination of derivatives. This research aimed to study the effect of different acids on zeolite characterizatics as adsorbent of ammonium hydroxide (NH4OH). The effect of acids addition  on natural zeolite was studied by varying the concentration of H2SO4(0,5 N; 3 N and 5 N) and concentration of H3PO4 (0,5 N; 3 N and 5 N). In this study, zeolite surface was observed by Fourier Transform Infrared (FTIR). Results were showed that the amount of NH4OH adsorbed on H- zeolite has a maximum (23,6 mg/gram zeolit) at 5 N H2SO4. From the NH4OH uptake experiment, it was noted that zeolite obtained from H-Zeolite-H2SO4 has higher NH4OH adsorption capacity than that of zeolite obtained from H-Zeolite-H3PO4. The adsorption capacity of H-Zeolite-H2SO4, H-Zeolite-H3PO4, are 23,6 mg/g and 12,9 mg/g, respectively. FTIR analysis was showed that NH4OH adsorbed on the surface of H- zeolite on Brønsted acid peak.
BIOPELUMAS DARI MINYAK NABATI (REVIEW) Sri Wahyuni Santi R; Mahreni Mahreni; Renung Reningtyas
Eksergi Vol 13, No 2 (2016)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v13i2.1698

Abstract

Pertumbuhan otomotif di Indonesia terus mengalami peningkatan. Maka tak heran jika kebutuhan pendukungnya seperti pelumas juga mengalami peningkatan pula. Di Indonesia, kebutuhan akan pelumas atau oli mencapai angka 300 juta liter pertahunnya. Kira kira 40% pelumas akan dibuang ke lingkungan menjadi limbah non biodegradable dan bersifat sebagai limbah B3. Untuk menunjang lingkungan yang mendukung pembangunan berkelanjutan, dunia membutuhkan pelumas biodegradable atau biopelumas. Biopelumas dapat menyamai karakristik dan menggantikan fungsi pelumas berbasis petroleum. Bahan dasar biopelumas pada saat ini adalah minyak nabati melalui serangkaian modifikasi secara kimia dapat diubah menjadi senyawa mono, di atau tri ester. Ester dari minyak nabati menunjukkan sifat sifat fisika dan kimia lebih baik dibandingkan dengan pelumas petroleum. Baik sifat fluida pada temperatur rendah meliputi titik tuang, titik beku dan viskositas. Juga sifat tribologi (keausan) dan stabilitas terhadap oksidator pada temperatur tinggi. Dalam makalah ini dijelaskan mengenai perkembangan terbaru beberapa proses produksi bio pelumas ramah lingkungan berbasis ester sebagai formula generasi baru yang  menunjang  pembangunan berkelanjutan
Kinetika Reaksi Isomerisasi α-pinene Retno Ringgani; Budhijanto Budhijanto; Arief Budiman
Eksergi Vol 13, No 1 (2016)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v13i1.1434

Abstract

Terpentin merupakan hasil hutan non kayu yang berasal dari pohon pinus. Terpentin diperoleh  dari hasil produk non kayu berupa getah pinus dengan kandungan tertinggi berupa α-pinene dengan cara didistilasi dan menghasilkan produk atas berupa terpentin dan produk bawah berupa gondorukem. Terpentin yang dipakai pada penelitian ini memiliki komposisi α-pinen 80,03 %, camphen 1,95%, β-pinen 2,78 %, ∆-caren 11,91% dan limonen 1,99%. Reaksi isomerisasi α-pinen merupakan reaksi paralel yang menghasilkan beberapa produk isomer, yaitu camphen, limonen,α-terpinen, γ-terpinen, dan terpinolen. Produk hasil isomerisasi α-pinen merupakan produk intermediate yang digunakan dalam industri farmasi, chemical fragrance, anti bakteri dan industri parfum. Pada penelitian ini, dipelajari reaksi isomerisasi α-pinen menggunakan katalis resin amberlyst 36. Reaksi isomerisasi α-pinen dilakukan pada reaktor batch berpengaduk dengan variasi suhu 70 - 1000C. Kinetika reaksi isomerisasi α-pinen dari terpentin didekati dengan reaksi order satu irreversible. Model kinetika yang diusulkan menunjukkan kesesuaian dengan hasil eksperimen baik. Dari hasil perhitungan diperoleh parameter faktor tumbukan (A) dan Energi Aktivasi (E) untuk masing-masing camphene, limonene, α-terpinene, γ-terpinene, terpinolene yaitu 0,825x105 dm.s-1; 0,0061x105 dm.s-1;0,0645x105 dm.s-1;0,0595x105 dm.s-1; 0,0645x105 dm.s-1 dan 27,93 kJ/mol; 19,67 kJ/mol; 18,53 kJ/mol; 19,25 kJ/mol; 4,28 kJ/mol.

Page 4 of 30 | Total Record : 298

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