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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,

Author-ID : 225180

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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Pemanfaatan Gas Alam sebagai LPG (Liquified Petroleum Gas) Samuel Sembiring; Ruben Leonardo Panjaitan; Susianto Susianto; Ali Altway
Jurnal Teknik ITS Vol 8, No 2 (2019)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Indonesia merupakan salah satu negara dengan sumber daya alam yang sangat melimpah. Salah satunya adalah gas alam. Berdasarkan data Direktorat Jendral Minyak dan Gas Alam Kementerian Energi dan Sumber Daya Mineral (ESDM) per tanggal 1 Januari 2017 cadangan gas alam mencapai 142,72 TCF. Gas alam merupakan salah satu sumber daya alam yang dapat dimanfaatkan untuk berbagai produk, salah satunya diolah menjadi Liquefied Petroleum Gas (LPG). Oleh karena itu akan didirikan pabrik LPG pada tahun 2021 di Bontang, Kalimantan Timur dipilih dikarenakan besarnya potensi gas alam yang tersedia, sumber energi, iklim dan beberapa aspek lain yang sangat mendukung untuk didirikannya pabrik LPG di Bontang, Kalimantan Timur. Pabrik LPG dari gas alam ini direncanakan terdiri dari 4 unit utama, yaitu Acid Gas Removal Unit, Dehidration Unit, Refrigration Propane Unit, dan Fractination Unit. Pabrik direncanakan beroperasi secara kontinyu 24 jam selama 330 hari pertahun dengan kapasitas produksi sebesar 98.712 ton LPG/tahun. Jumlah gas alam yang dibutuhkan sebagai bahan baku sebesar 1,6 juta ton per tahun. Total modal investasi sebesar Rp 2.586.262.350.491. Hasil penjualan per tahun sebesar Rp 1.988.889.225.300. Sehingga diperoleh Internal Rate of Return 29,88%, Pay Out Time selama 5,6 tahun dan Break Even Point 29,76%.

Pra Desain Pabrik Triacetin (Triacetyl Glycerol) dari Produk Samping Produksi Biodiesel (Crude Glycerol) Dwi Arimbi Wardaningrum; Muhammad Iqbal Fauzie; Susianto Susianto; Ali Altway
Jurnal Teknik ITS Vol 9, No 2 (2020)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23373539.v9i2.56094

Salah satu produk turunan gliserol yakni triacetin. Kegunaan triacetin sendiri cukup banyak di kalangan industri, baik industri makanan maupun non makanan. Kegunaan triacetin banyak digunakan sebagai penambah aroma, platisizer, pelarut, bahan aditif bahan bakar untuk mengurangi knocking pada mesin (menaikkan nilai oktan), serta dapat digunakan sebagai zat aditif untuk biodiesel. Di Indonesia masih belum ada pabrik triacetin sehingga nilai produksi dan ekspor triacetin kosong atau tidak ada dan nilai impor sebesar 46.000 ton/tahun. Pabrik direncanakan mulai beroperasi pada tahun 2023 dengan kapasitas sebesar 46.000 ton/tahun dengan tujuan mensubstitusi nilai impor yang ada. Lokasi pendirian pabrik berada di Dumai, Riau. Produksi triacetin dari gliserol dilakukan melalui tiga tahap, yaitu pre-treatment, esterifikasi, dan purifikasi. Di bagian pre-treatment, crude glycerol memasuki flash tower, lalu dilanjutkan memasuki kolom distilasi untuk dimurnikan hingga 99,99% gliserol. Di bagian esterifikasi, gliserol dan asam asetat dialirkan menuju reaktor esterifikasi R-210. Reaksi yang terjadi dalam reaktor adalah reaksi esterifikasi antara gliserol dengan asam asetat berlebih membentuk monoacetin, diacetin, dan triacetin dengan menggunakan katalis Amberlyst-15. Jenis reaktor yang digunakan adalah Batch. Setelah 4 jam reaksi, dihasilkan konversi 100% dengan menghasilkan 2% monoacetin, 54% diacetin, dan 44% triacetin. Kemudian, hasil reaksi esterifikasi diumpankan menuju proses selanjutnya yaitu decanter dan dua kolom distilasi untuk dilakukan pemurnian dengan pemisahan menjadi produk utama triacetin dan produk samping diacetin. Dengan estimasi umur pabrik 20 tahun, dapat diketahui internal rate of return (IRR) sebesar 18,36%, pay out time (POT) 6,5 tahun dan break even point (BEP) sebesar 29,57 %.

Aplikasi Packet Diffusion Model untuk Menganalisis Pengaruh Fenomena Micromixing terhadap Jalannya Reaksi Kimia Paralel di dalam Reaktor Tangki reraduk Kontinyu dengan Aliran Umpan Terpisah Ali Altway; Sugeng Winardi; M Rachimoellah
Forum Teknik Vol 28, No 2 (2004)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar

The effect of turbulent mixing on the course of two fast parallel competitive chemical reactions (netralization of sodium biborate snd iodide-iodate oxidation-reduction reactions) carried out in continuous stiwed tank reaktors have been studied theoretically, using PacketDiffusion Model, and experimentally to validate the theoretical predictions.System studied consists of flat bottom cylindrical tank 0.2 m in diameter. The height of liquid in the tank is also 0.2 m. The tank was equipped with Fan Turbine with diameter equal to I/3 tank diameter. Sulphuric acid solution (0.5 Il,Q was fed into the tank through 2 mm-diameter pipe, and the aquous solution containing 0.0909 M NaH2Boj, 0.0909 M H:Bo:, 0.0116667 M KI, and 0.0023333 M KIO3wasfed into the tank through I0 mm-diameter pipe. The rate of acid solution was varied 0,045, 0.068, and 0.09 liter/minute, while the rate of the other solution was varied I, 1.5, and 2 liter/minute (the rate variation coruespond to the mean residence time variation of 6, 4, and 3 minutes). The impeller rotation speedwas varied; 9,12, and I5 rps. The iodine concenftation in the tank influent was analyzed using spectrophotometer.The simulation works conclude that the selectivity of iodine decrease with increasing impeller rototion speed for the mean residence time of 3 and 4 minutes, while for the mean residence time of 6 minutes, the iodine selectivity increase with increasing impeller rotation speed. Increasing the mean residence time from 3 to 4 minutes will decrease the iodine selectivity, while increasing the mean residence time further to 6 minutes will increase the selectivity. The theoretical prediction using Packet Difusion Model agree fairly well with the experimental data. The experimental studies also showed that the feed position in the region of high turbulent intensity (impeller region) give lower iodine selectivity compaired to the selectivity in the region of lower turbulent intensity. The Packet Dffision Model cannot simulate the effect offeed position on the iodine selectivity.Keywords: Packet Diffusion Model, Micromixing, and Continuous Stirred Tank Reactor

PENGARUH MODEL ALIRAN TERHADAP RECOVERY CO2 PADA ABSORPSI GAS CO2 OLEH LARUTAN K2CO3 DIDALAM PACKED COLUMN DENGAN KONDISI NON-ISOTHERMAL Kusnarjo Kusnarjo; Kuswandi Kuswandi; Susianto Susianto; Ali Altway
Reaktor Volume 12, Nomor 3, Juni 2009
Publisher : Dept. of Chemical Engineering, Diponegoro University

Penelitian ini bertujuan untuk mempelajari pengaruh model aliran terhadap recovery gas pada absorpsi gas CO2 menggunakan larutan K2CO3 yang di kontakkan secara berlawanan arah (counter current) didalam packed column menggunakan packing jenis raschig ring. Penelitian dilakukan menggunakan kolom kaca berdiameter 10 cm dan tinggi 150 cm. Packing dibuat dari logam aluminium berdiameter 1,0 cm dan tinggi 2,0 cm yang mengisi bagian kolom setinggi 100 cm. Variabel penelitian ini adalah konsentrasi CO2 20% volume, dengan laju alir 10 sampai 35 l/menit dan konsentrasi K2CO3,1M dan 1,5M dengan laju alir 3 sampai 7,5 l/menit. Dari hasil penelitian absorpsi gas CO2 20% volume menggunakan larutan Benfield dengan model aliran non-ideal besar % recovery gas CO2 dengan larutan K2CO3 1,5M, jumlahnya lebih besar dibandingkan dengan larutan K2CO3 1M, sedangkan absorpsi CO2 dengan campuran udara 80% volume dengan model aliran non-ideal (D/uL=0,1), jumlah % recovery gas CO2 lebih kecil dibandingkan dengan aliran ideal (D/uL=0,2). Validasi antara simulasi dengan eksperimen dengan cara membandingkan kesalahan hasil penelitian menunjukkan bahwa besar % recovery CO2 secara ekperimen lebih rendah dibandingkan dengan cara simulasi. Hasil perhitungan % recovery gas CO2 menggunakan jenis aliran tidak ideal mendekati data eksperimen dengan error 6,52%.

Tin Extraction from Slags Used Hydrochloric Acid Nonot Soewarno; Ali Altway; Susianto Susianto; Fadlilatul Taufany; Siti Nurkamidah
IPTEK The Journal of Engineering Vol 1, No 1 (2014)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v1i1.a438

Slag is a mixture of mineral in tin sand or by product in the smelting process. By using separation process, tin can be separated from other minerals in slag. Extraction process with a solvent is usually used to separate tin from other minerals. Furthermore, solution that still contains many dissolved compounds is adsorbed by activated carbon and desorption back with NaOH solution. This study only focuses on the extraction process to obtain a stannate chloride solution with extraction temperature, solvent concentration, extraction time, and liquid/solid ratio as variables. Hydrochloric acid (HCl) has been used as solvent in this study. The concentration of tin in the extracts of each variable was analyzed to determine the percentage of recovery of tin and the optimum operating conditions in the recovery process of tin from waste slag. Experiment results show that the percentage of recovery increases with the increasing of extraction temperature and solvent concentration The highest recovery is 61.5% which is obtained when the extraction temperature is 80 ºC, concentration of HCl is 10 wt%, with a HCl solution and slag ratio is 7: 1 and extraction time is about 30 minutes.

Prediction of Gas-Liquid Equilibria of CO2-K2CO3-MDEA-H2O System by Electrolyte UNIQUAC Model saidah altway; Kuswandi Kuswandi; Ali Altway
IPTEK The Journal of Engineering Vol 1, No 1 (2014)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v1i1.a437

Carbon dioxide is an acid gas that can be harmful impurity especially in the chemical industry. Various processes have been developed to reduce the CO2 from the gas stream. Chemical absorption is the most economical method for CO2 separation. One of the processes that is widely used in industries is Benfield process with K2CO3 (potassium carbonate) as a solvent and amine as a promotor. In this study, MDEA (Methyldiethanolamine) is used as a promotor. As a reference for designing CO2 absorption/stripping packed column in industries, gas-liquid equilibrium data were required. The objective of this study is to predict the gas-liquid equilibria of CO2-K2CO3-MDEA-H2O system at 30oC and atmospheric pressure with 30% K2CO3 and variation of weight percent of MDEA 2, 5, 8, and 10%. The model used in this study is an electrolyte UNIQUAC. The simulation was conducted using Matlab programming. The deviation of predicted CO2 partial pressure with the experimental data is 14.85%. The energy interaction parameters of electrolyte UNIQUAC model were obtained from fitting with the experimental data by Least Square method. The results of this study represented that with increasing CO2 partial pressure, CO2 loading increased, and also at the same partial pressure of CO2, CO2 loading increased with the increase of weight percent of MDEA

Proses Katalitik Pirolisis Untuk Cracking Bitumen Dari Asbuton dengan Katalis Zeolit Alam Susianto Susianto; Yosita Dyah Anindita; Azka Afuza; Eldira Nindri Wena; Ali Altway
IPTEK Journal of Proceedings Series No 2 (2018): The 2nd Conference on Innovation and Industrial Applications (CINIA 2016)
Publisher : Institut Teknologi Sepuluh Nopember

Asbuton adalah aspal alam yang terkandung dalam deposit batuan terdapat di Pulau Buton, Sulawesi Tenggara. Asbuton berpotensi menjadi bahan bakar alternatif. Penelitian tentang pirolisis bitumen menjadi hidrokarbon (heavy oil) sudah mulai dikembangkan, namun belum banyak dilakukan. Oleh karena itu penelitian ini bertujuan untuk mempelajari pengaruh temperatur pirolisis terhadap % yield masing – masing produk, mempelajari pengaruh penambahan katalis pada masing-masing temperatur pirolisis terhadap % yield masing – masing produk, mempelajari pengaruh temparatur pirolisis terhadap % yield produk cair dengan dan tanpa katalis. Pirolisis bitumen yang terkandung dalam asbuton dilakukan secara semi-continue dalam reaktor pirolisis pada kondisi vakum dengan variable temperatur pirolisis sebesar 300oC, 350oC, 400oC, 450oC, dan 500oC. sedangkan zeolit klipnotilolit sebagai katalis divariasi sebesar 5%, 7%, dan 9% dari berat feed asbuton. Feed asbuton sebanyak 228 gram dicampur dengan katalis sesuai perbandingan kemudian dimasukan ke dalam reaktor pirolisis. Heater dioperasikan sesuai temperatur yang diinginkan kemudian di vakum dengan menggunakan pompa vakum. Gas yang terbentuk akan dialirkan melalui kondensor yang dijaga temperaturnya pada 25oC. Gas yang terkondensasi (produk cair) akan tertampung dalam erlenmeyer, sedangkan gas yang tidak terkondensasi (produk gas) akan ditampung dalam kantong gas. Kemudian %yield produk masing-masing dianalisa. Hasil penelitian menunjukan bahwa metode pirolisis dapat digunakan untuk cracking bitumen yang terkandung dalam asbuton dengan kondisi terbaik untuk mendapatkan yield produk cair tertinggi sebesar 61.531% diperoleh dalam kondisi temperatur pirolisis 350oC dengan penambahan 9% katalis.

Studi Pemisahan Bitumen dari Asbuton Menggunakan Media Air Panas dengan Penambahan Surfaktan Anionik dan NaOH Susianto Susianto; Yosita Dyah Anindita; Gissa Navira Sevie; Fadlilatul Taufany; Ali Altway
IPTEK Journal of Proceedings Series No 2 (2018): The 2nd Conference on Innovation and Industrial Applications (CINIA 2016)
Publisher : Institut Teknologi Sepuluh Nopember

Asbuton adalah aspal alam yang terkandung dalam deposit batuan terdapat di Pulau Buton, Sulawesi Tenggara. Asbuton dimanfaatkan sebagai bahan alternatif pengganti aspal minyak setelah bitumen dipisahkan dari mineralnya. Penelitian proses pemisahan bitumen dari asbuton menggunakan hot water process sebelumnya telah dilakukan, tetapi bitumen yang terambil kurang maksimal. Oleh karena itu, pada penelitian ini bertujuan untuk meningkatkan %recovery bitumen dengan modifikasi hot water process melalui penambahan surfaktan anionik dan NaOH. Proses pemisahan bitumen dari asbuton dilakukan melalui dua proses utama, yakni premixing-preheating dan digesting. Premixing-preheating dilakukan dengan mengaduk 250 rpm asbuton dan solar pada suhu 60,70,80, dan 90oC selama 30 menit. Proses digesting mengaduk 1500 rpm campuran solar-asbuton dengan penambahan wetting agent (Rwa), berupa larutan surfaktan LAS-NaOH sebesar 25%,30%,35% dan 40% terhadap massa campuran total. Konsentrasi larutan surfaktan LAS sebesar 0,5%,1%,1,5% dan 2%. Produk proses digesting dipisahkan secara gravitasi dengan menambahkan air garam konsentrasi 3.5% sehingga terbentuk tiga lapisan. Lapisan teratas merupakan larutan bitumen-solar, ditimbang berat dan diukur densitasnya untuk mengetahui persen (%) recovery yang diperoleh. Hasil penelitian menunjukkan bahwa % recovery bitumen tertinggi diperoleh sebesar 97,74% pada suhu 90oC dengan wetting agent 25% dan konsentrasi surfaktan 1.5%

Ethanol Production from Molasses with Immobilized Cells Technique in Packed Bed Bioreactor by Extractive Musfil AS; Tri Widjaja; Ali Altway; R. Darmawan Darmawan
IPTEK The Journal for Technology and Science Vol 21, No 1 (2010)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v21i1.26

The aim of this research was to study the effect of total sugar concentration, Ca-Alginate and K Carrageenan density in immobilized cells on packed-bed and batch bioreactor performance for ethanol production. In addition, this research was also aimed to study the effect of solvent flow rate on packed column performance expressed as % extraction recovery. This experiment was carried out with total sugar concentration of 10, 14, 18 % (v/v) and immobilized cells Ca-Alginate and K-Carrageenan at a density of 2% (w/v) with amyl alcohol as solvent. Based on the result of this study, it is concluded that the total sugar concentration influenced the concentration, yield and productivity of ethanol. The result of this study for immobilized Ca-Alginate cells showed that the maximum ethanol product concentration, yield and productivity were 7.28% g/l, 57.48 g/l, 38.22%, 71.85 g/l.hr, respectively. Meanwhile, immobilized K-Carrageenan cells showed the maximum ethanol product concentration, yield and productivity as 7.22% /56.99 g/l, 26.73%, and 68.40 g/l.hr, respectively. In extraction process, increasing amyl alcohol solvent flow rate will increase mass transfer and hence increase ethanol recovery.

KAJIAN TEORITIS PEMISAHAN H2S DALAM BIOGAS SECARA ABSORBSI REAKTIF KE DALAM LARUTAN Fe-EDTA MENGGUNAKAN PACKED COLUMN Ali Altway
Purifikasi Vol 10 No 1 (2009): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25983806.v10.i1.160

The presence of H2S in biogas gives dangerous effect on environment; Therefore, H2S must be eliminated from the biogas. The purpose of this research is to analyze theoretically the elimination process by reactive absorption of H2S in biogas into aqueous Fe-EDTA solution in packed column. This research was carried out by developing mathematical model of the process. The interfacial mass transfer phenomena were described by film model equations solved using van Krevelen approximation. Steady state, isothermal condition, and plug-like pattern of gas-liquid flow in packed column were assumed in this study. The model consists of differential mass balance of H2S in gas phase and Fe-EDTA in liquid phase arising system of non-linear first order differential equations solved numerically by Fourth order Runge-Kutta method under Mathlab facility. The system studied consists of a column 10 cm in diameter filled with 1cm raschig rings to the height of 100 cm. The gas flow rate was held constant at GV = 100 mL/s, liquid flow rate L’ was varied 20, 30, and 40 mL/s, pressure P was varied from 1 to 2.5 atm, the concentration of Fe-EDTA in inlet absorbent was varied from 0.02 to 0.06 kmol/m3. The experimental work was also carried out to validate the simulation prediction. The simulation results showed that the percentage of absorbed H2S can be enhanced by decreasing pressure, increasing temperature, liquid flow rate, and Fe-EDTA concentration The trend of pressure and temperature effect on % H2S recovery showed that the absorption process is controlled by the gas resistance. Using column with packing height of 1 meter, gas flow rate of 100 mL/s, using absorbent containing 0.06 kmol/m3 Fe-EDTA with flow rate of 20 mL/s, and at ambient pressure and temperature, the percentage recovery of H2S reached the value of above 99%. The simulation results agree very well with the experimental data within 3% error.

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

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