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All Journal Majalah Forum Teknik UGM Reaktor International Journal of Renewable Energy Development Jurnal Teknik ITS Jurnal Sains dan Seni ITS IPTEK The Journal of Engineering IPTEK Journal of Proceedings Series IPTEK The Journal for Technology and Science Jurnal Teknik Kimia Eksergi Bulletin of Chemical Reaction Engineering & Catalysis Journal of Research and Technology Indonesian Journal of Chemistry Jurnal Purifikasi ASEAN Journal of Chemical Engineering Jurnal Teknik Kimia Indonesia Lembaran Publikasi Minyak dan Gas Bumi Jurnal Rekayasa Kimia & Lingkungan Sewagati Petrogas : Journal of Energy and Technology Bulletin of Chemical Reaction Engineering & Catalysis Journal of Fundamentals and Applications of Chemical Engineering
Ali Altway
Chemical Engineering Department, Institute Technology Of Sepuluh Nopember, Surabaya,
Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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PENGARUH KONSENTRASI SURFAKTAN DAN KECEPATAN PUTAR PENGADUK TERHADAP PROSES PEMISAHAN BITUMEN DARI ASBUTON Nora Amelia Novitrie; Susianto; Ali Altway
Journal of Research and Technology Vol. 2 No. 2 (2016): JRT Volume 2 No 2 Des 2016
Publisher : 2477 - 6165

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (65.758 KB)

Abstract

Asbuton is a rock contain of the bitumen. Asbuton can be used as road construction alternatives after extracting bitumen from the mineral. A method for separating bitumen is separation process using hot water medium. The process was carried out in a stirred tank, 200 grams of asbuton was mixed with diesel oil and added by hot chemical solution (surfactant) in the digestion tank. The separation process in the extractor was made at 900C and time set was 30 minutes. Surfactan concentration and the speed of stirrer were set according to the variable. After the process completed, the mixture was moved into a beaker glass and 500 ml hot water was added. The mixture of diesel oil and bitumen will float in the surface then the density will be measured to determine the bitumen concentration. It can be concluded that concentration of surfactant solution and speed of stirrer have the significant results. The highest recovery percentage of bitumen is 81,99 %. Keywords: Asbuton, Hot water, Speed of stirrer, Surfactant.
STUDI EKSPERIMENTAL FALLING FILM EVAPORATOR PADA EVAPORASI NIRA KENTAL Medya Ayunda Fitri; Suhadi; Ali Altway; Susianto
Journal of Research and Technology Vol. 2 No. 1 (2016): JRT Volume 1 No 1 Jun 2016
Publisher : 2477 - 6165

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Abstract

Falling film evaporator is a constructed equipment for concentrating dilute solution that are sensitive to heat flowing form a thin film. This research aims to study the evaporation of cane juice concentrated with air flow on falling film evaporator and knowing evaporation rate occured in falling film evaporator used. In the process, cane juice from plant pumped to the falling film evaporator that used in this experiment. This research used concentrated cane juice and air flow rate for variables of this experiment. Cane juice flow from top of evaporator through distributor to form thin film and air flow from the bottom of evaporator. After that, temperatur of pipe wall, inlet and outlet temperature of cane juice and air were measured. This experiment concluded that the highest concentration of outlet solution is 59 brix for liquid flow rate 154 l/h and air flow rate 10 m3/h, and the other hand inlet solution concentration 51 brix. Optimum evaporation rate is 35 kg/m2.h for 51 brix and air flow rate 10 m3/h. Keywords: Concentrated cane juice, Evaporator, Evaporation rate, Falling film.
Biodegradation of Extractable Petroleum Hydrocarbons by Consortia Bacillus cereus and Pseudomonas putida in Petroleum Contaminated-Soil Abubakar Tuhuloula; Suprapto Suprapto; Ali Altway; Sri Rachmania Juliastuti
Indonesian Journal of Chemistry Vol 19, No 2 (2019)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (512.652 KB) | DOI: 10.22146/ijc.33765

Abstract

Contamination of soil by the activities of exploration, production, and disposal of oil waste into the environment causes serious damage to the environmental ecosystem, the target of processing by the bacteria as a model for remediation of oil contaminated site. Thus, the study was focused on determining the biodegradation percentage of extractable petroleum hydrocarbons as a function of the oil concentration. This research was conducted in a slurry bioreactor with mixed contaminated soil to water ratio of 20:80 (wt.%). A consortium of Bacillus cereus and Pseudomonas putida bacteria 10% (v/v) and 15% (v/v) with the ratio of 2:3, 1:1, and 3:2 was inserted into the slurry bioreactor and a single reactor was used as a control. The result of identification with an initial concentration of extractable petroleum hydrocarbons of 299.53 ng/µL, after 49 days of incubation for bacterial consortium 10% (v/v), the concentration was reduced to 85.31; 32.43; 59.74; and 112.22 ng/µL respectively and the biodegradation percentage was 71.5; 89.17; 80.05; and 62.54%. As for the bacterial consortium concentration of 15% (v/v) with the same ratio and control, the effluent concentration was 12.48; 7.72; 18.93 ng/µL, respectively or the biodegradation percentage was 95.83; 97.42; 93.68%.
Microwave-Assisted Hydrodistillation of Clove (Syzgium aromaticum) Stem Oil: Optimization and Chemical Constituents Analysis Haqqyana Haqqyana; Ali Altway; Mahfud Mahfud
Indonesian Journal of Chemistry Vol 21, No 6 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.64521

Abstract

One of the extensively prosperous potential aromatic plants is the clove (Syzgium aromaticum). This is owing to all parts of this plant (bud, stem, and leaves) contain a decent amount of essential oils. The current study focuses on the use of microwave-assisted hydrodistillation (MHD) in extracting clove stem essential oils. This study aims to obtain the best possible combination of operating parameters for a high yield of clove stem oil using response surface methodology. The current study adopted a face-centered central composite design to optimize the MHD operational parameters, including the feed-to-solvent ratio, microwave power, and extraction time. The observed data from the experiments were fitted to a reduced quadratic polynomial equation. The three operational parameters were shown to significantly affect the extraction yield of the clove stem oil (p  < 0.05), yet the statistical significance for the interaction between each parameter was considerably weak. Furthermore, the adjusted R2 value measured comparably to the corresponding R2 value with the difference below 0.2, implying a high correlation between experimental and model-predicted data. Thus, this result demonstrates the suitability of the model used in the experiment.
The Optimization of Natural Gas Utilization Network in Single Region Using Pinch Analysis Method Rendra Panca Anugraha; Annasit Annasit; Ali Altway; Juwari Juwari; Renanto Handogo
ASEAN Journal of Chemical Engineering Vol 20, No 1 (2020)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ajche.51953

Abstract

Natural gas is one of the cleanest energy resources and may have potency to replace crude oil as main energy resource in several decades. There are some aspects which must be concern in the development of the natural gas industry including processing, storing, distributing and utilizing of the natural gas. The network of natural gas supply also should be generated to obtain the maximum natural gas recovery. However, it is difficult to determine the most suitable network system to connect the supply and demand of natural gas due to their different time scale, flowrate and capacity. There are some studies which investigating the network system to connect the supply and demand of natural gas but there are no systematical method in determination of the optimum natural gas network in single region supply-chain using pinch analysis. Therefore, in this study, a systematical method was developed to design natural gas network system in single region (East Java) using pinch analysis. The concept of natural gas cascade calculation was introduced. The heuristics of natural gas pairing between source and sink streams in grid diagram analysis was developed. Using 0-year time minimum difference give the amount of unutilized supply with value of 258.4 billion standard cubic feet (BCF) while 3-year time minimum difference give the amount of alternative and unutilized supply with value of 639.3 BCF and 897.7 BCF, respectively. The grid diagram heuristics developed in this study gives same results with the cascade calculation result.
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.
Modeling and Simulation of Carbon Dioxide Gas Reactive Desorption Process with Piperazine Promoted Diethanolamine Solvent in Sieve Tray Column Nur Ihda Farikhatin Nisa; Nabila Farras Balqis; Muhammad Anshorulloh Mukhlish; Ali Altway; Mahfud Mahfud
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 4 Year 2022 (December 2022)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.4.16245.798-810

Abstract

Carbon dioxide (CO2) is an acidic and corrosive gas, and the presence of this gas in the piping system can cause various problems in the industrial sector. Therefore, the CO2 must be separated from the gas stream. One of the CO2 gas separation processes from the gas stream is carried out in a CO2 removal unit, where a desorption unit serves as a solvent regeneration step. Therefore, this study aims to develop a rate-based model and simulation of the reactive desorption process of CO2 gas in a sieve tray column. The rate-based model in the reactive desorption process of CO2 gas is based on film theory, the liquid in the tray is assumed completely agitated due to gas bubbling, the flow pattern of gas is plug flow, and the effect of the reaction on the mass transfer follows the enhancement factor concept. The number of trays used in this study was 20. In addition, the effect of several variables, such as: desorber pressure, rich amine temperature, rich amine flow rate, and reboiler load, was also assessed on the CO2 stripping efficiency. The accuracy of our prediction model is 1.34% compared with industrial plant data. Compared with the chemical engineering simulator simulation results, the average deviation is 4%. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Pra Desain Pabrik Garam Farmasi dari Air Laut dengan Metode Multiple Effect Evaporator Ragilia Rahma Maulidia; Wahyu Adinda Larasati; Ali Altway; Fadlilatul Taufany
Jurnal Teknik ITS Vol 11, No 3 (2022)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23373539.v11i3.94236

Abstract

Garam banyak digunakan oleh beberapa industri, salah satunya pada industri farmasi yang dibutuhkan untuk bahan-bahan medis dan obat-obatan. Garam farmasi memiliki kualitas yang paling tinggi diantara garam yang lainnya yaitu memiliki kadar NaCl >99,5%. Garam farmasi tersebut dapat diperoleh dari air laut yang tersedia banyak di Indonesia. Proses yang digunakan dalam pembuatan garam farmasi yaitu dengan menggunakan multiple effect evaporator. Proses pembuatan garam farmasi dari air laut dibagi menjadi 3 unit proses, yaitu unit pemurnian, unit pengkristalan dan pengeringan, dan unit pengendalian produk. Dari hasil proses didapatkan garam farmasi dengan kemurnian 99,6%. Hasil terssebut sesuai dengan standart menurut Farmakope Indonesia (FI) Edisi IV bahwa kemurnian garam farmasi adalah 99,5%. Pabrik garam farmasi berkapasitas produksi sebesar 9000 ton/tahun. Lokasi pendirian pabrik pengolahan garam farmasi direncanakan di Desa Tamansareh, Kabupaten Sampang, Madura. Dengan kapasitas tersebut dan desai umur pabrik selama 10 tahun, didapatkan Internal Rate of Return (IRR) sebesar 14,79% yang dimana nilainya lebih besar dari bunga pinjaman bank sebesar 8%. Kemudian didapatkan Pay Out Time (POT) sebesar 5,71 tahun dan Break Even Point (BEP) sebesar 20,91%.
Simulasi Unit Stripping CO2 Dalam Packed Column Skala Industri Dengan Kondisi Non-Isothermal Nur Ihda Farikhatin Nisa; Ali Altway; Susianto S
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 1 (2019): Jurnal Rekayasa Kimia & Lingkungan (June, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (364.726 KB) | DOI: 10.23955/rkl.v14i1.13547

Abstract

Emisi karbondioksida ke atmosfer dianggap sebagai penyebab utama perubahan iklim, termasuk pemanasan global dan permasalahan pertanian. Berbagai teknologi pemisahan CO2 banyak dikembangkan. Absorpsi kimia adalah teknologi pemisahan yang paling efektif dan banyak digunakan dalam industri kimia maupun petrokimia. Dimana pelarut yang telah digunakan dapat di regenerasi kembali di kolom stripper. Stripping adalah proses regenerasi termal pelarut dimana larutan tersebut dikontakkan dengan pelarut gas yang tidak larut terhadap cairan tersebut. Penelitian ini bertujuan untuk mengembangkan simulasi unit stripping CO2 dalam packed column skala industri dengan mengestimasi kinerja unit stripping CO2 yang dinyatakan dengan % efisiensi kolom stripping dan komposisi gas yang keluar dari stripper. Simulasi dilakukan secara teoritis dengan mengembangkan model matematis untuk proses stripping CO2 dalam packed column skala industri. Selanjutnya hasil simulasi divalidasi dengan data riil pada salah satu industri pupuk di Indonesia. Variabel-variabel yang digunakan adalah tekanan operasi kolom, temperatur rich solution dan laju steam. Hasil simulasi untuk tekanan stripper 2,56 atm dengan laju rich solution 2943316 kg/jam dan temperatur rich solution 390 K menunjukkan CO2 (% mol)  99,038%, sedangkan data pabrik menunjukkan 97,5862%. 
PENGARUH POROSITAS PACKING STEEL WOOL TERHADAP PRESSURE DROP DIDALAM PACKED BED COLUMN PADA DISTILASI CAMPURAN ETANOL-AMIL-ALKOHOL-AIR Trisna Kumala Dhaniswara; Tri Widjaja; Ali Altway
Journal of Research and Technology Vol. 2 No. 1 (2016): JRT Volume 1 No 1 Jun 2016
Publisher : 2477 - 6165

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Abstract

Inventories of petroleum fuels are increasingly depleted and will someday run out. These shortcomings can be overcome by using alternative fuels, such as ethanol. Based on this, it is necessary to research and development of ethanol as a fuel. One way is with a separation in a packed distillation column. This study aims to assess the mass transfer phenomena that occur in the process of distilling a mixture of ethanol-water-amyl alcohol packed in column. In addition, this study aims to optimize temperature and reflux to obtain the highest levels of ethanol. This research method uses packed bed distillation system with the batch process. Feed used is synthetic ethanol, water, and solvent. Solvent used were amyl alcohol. Doing distillation with heating temperature is maintained. Distillation is done in the packing of stainless steel wool. Research carried out in a batch process with a variable temperature of 79°C; 84°C; 91°C; and porosity packing 20%; 30%; 40%; 50%; 60%; 70%; 80%.
Co-Authors Abdul Hafid Abubakar Tuhuloula Achmad Roesyadi Adi Soeprijanto Aditya Akhmad Sony Afan Hamzah, Afan Afri Dwijatmiko Aisyah Alifatul Altway, Saidah Anggraheny, Nurul Annasit Annasit Atha Pahlevi Ayu Larasati Azka Afuza Bayu Yusuf Budhikarjono, Kuswandi Kusno Dwi Arimbi Wardaningrum Eldira Nindri Wena Endah Prasetyo Rini Eriska Wahyu Kusuma Erlinda Ningsih, Erlinda Fadillatul Taufany Fadlilatul Taufany Faris Adrian Firsta Hardiyanto Gissa Navira Sevie Haqqyana Haqqyana Harahap, A. H. Hendi Riesta Mulya Istiyanie, Dewi Istiyanie, Dewi Junety Monde Juwari Juwari K Kusnaryo K Kuswandi Karnila Willard Koatlely Serpara Kusnarjo Kusnarjo Kuswandi Kuswandi Kuswandi Kuswandi Kuswandi Kuswandi Lailatul Qadariyah Lailatul Qomariyah, Lailatul Lily Pudjiastuti, Lily Ling Ling M Rachimoellah M Rachimoellah Mahfud Mahfud Mahfud Mahfud Margono Margono Medya Ayunda Fitri Merisa Veronika Suparto Meydita, A. D. Miftah Imam Maarif Mochamad Sidiq Muhammad Alraedi Syukharial Muhammad Anshorulloh Mukhlish Muhammad Fadlan Minallah Muhammad Iqbal Musfil AS Nabila Farras Balqis Nadhifa Auria Andini Nonot Soewarno Nora Amelia Novitrie Novitrie, Nora Amelia Nuniek Hendrianie Nur Aini Nadhifah Nur Ihda Farihatin Nisa Nur Ihda Farikhatin Nisa Nur Ihda Farikhatin Nisa Nurkhamidah, Siti Palupi, A. E. Prapti Ira Kumala Sari R. Darmawan Darmawan Rachmaniah, Orchidea Ragilia Rahma Maulidia Renanto Handogo Rendra Panca Anugraha Ruben Leonardo Panjaitan Salasa Ariq Sungkono Samuel Sembiring Siti Machmudah Siti Nurchamidah Siti Nurkamidah Siti Zullaikah Sri Rachmania Juliastuti Sugeng Winardi Suhadi Suhadi Suhadi Suprapto Suprapto Suprapto Suprapto Surya Rachmadani Susianto S Susianto Susianto Susianto Susianto Tantular Nurtono Tri Widjaja Tri Widjaja Trisna Kumala Dhaniswara W Widiyastuti Wahyu Adinda Larasati Widiyastuti Winardi, S. Winardi, Sugeng Wulansari, Dessy Yeni Rahmawati, Yeni Yosita Dyah Anindita Yunita D Indrasari Zulfahmi Hawali