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PENGARUH POROSITAS PACKING STEEL WOOL TERHADAP PRESSURE DROP DIDALAM PACKED BED COLUMN PADA DISTILASI CAMPURAN ETANOL-AMIL-ALKOHOL-AIR Dhaniswara, Trisna Kumala; Widjaja, Tri; Altway, Ali
Journal of Research and Technology Vol 2, No 1 (2016)
Publisher : Universitas Nahdlatul Ulama Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (640.652 KB) | DOI: 10.5281/zenodo.2582225

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%.
STUDI EKSPERIMENTAL FALLING FILM EVAPORATOR PADA EVAPORASI NIRA KENTAL Fitri, Medya Ayunda; Suhadi, Suhadi; Altway, Ali; Susianto, Susianto
Journal of Research and Technology Vol 2, No 1 (2016)
Publisher : Universitas Nahdlatul Ulama Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (375.175 KB) | DOI: 10.5281/zenodo.2582030

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.
PENGARUH KONSENTRASI SURFAKTAN DAN KECEPATAN PUTAR PENGADUK TERHADAP PROSES PEMISAHAN BITUMEN DARI ASBUTON Novitrie, Nora Amelia; Susianto, Susianto; Altway, Ali
Journal of Research and Technology Vol 2, No 2 (2016)
Publisher : Universitas Nahdlatul Ulama Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (65.758 KB) | DOI: 10.5281/zenodo.2581969

Abstract

Asbuton is a rock that contain 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 then the speed of stirrer were set according to the variable and time was set 30 minutes. After the complete process, 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 gave the significant results. The highest recovery percentage of bitumen is 81,99 %. Keywords: asbuton, hot water, surfactant, speed of stirrer
SIMULASI UNIT STRIPPING CO2 DALAM PACKED COLUMN SKALA INDUSTRI DENGAN KONDISI NON-ISOTHERMAL Nisa, Nur Ihda Farikhatin; Altway, Ali; S, Susianto
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 1 (2019): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (298.8 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%. 
BIODEGRADATION OF EXTRACTABLE PETROLEUM HYDROCARBONS BY CONSORTIA BACILLUS CEREUS AND PSEUDOMONAS PUTIDA IN PETROLEUM CONTAMINATED-SOIL Tuhuloula, Abubakar; Suprapto, Suprapto; Altway, Ali; Juliastuti, Sri Rachmania
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%.
KAJIAN TEORITIS PEMISAHAN H2S DALAM BIOGAS SECARA ABSORBSI REAKTIF KE DALAM LARUTAN Fe-EDTA MENGGUNAKAN PACKED COLUMN Altway, Ali
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

Abstract

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.
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; Altway, Ali
Reaktor Volume 12, Nomor 3, Juni 2009
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (317.996 KB) | DOI: 10.14710/reaktor.12.3.154 – 160

Abstract

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%.
PENANGKAPAN CO2 DENGAN MENGGUNAKAN PELARUT KALIUM KARBONAT BERPROMOTOR ASAM BORAT (CO2 Capture Using Potassium Carbonate solvent with Boric Acid Promoter) Istiyanie, Dewi; Altway, Ali
Lembaran Publikasi Minyak dan Gas Bumi Vol 50, No 3 (2016)
Publisher : Lembaran Publikasi Minyak dan Gas Bumi

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

Abstract

Penangkapan CO2 dengan menggunakan pelarut kalium karbonat sampai saat ini masih terdapat kelemahan, yaitu laju reaksi yang lambat. Pada penelitian ini untuk mengatasinya maka digunakan promotor asam borat karena lebih ekonomis dan ramah lingkungan. Uji coba skala laboratorium dilakukan dengan sistem kontinu, yaitu dengan cara mengalirkan gas CO2 (20%) ke dalam pelarut K2CO3 (30%) berpromotor H3BO3 (3%) di dalam absorber pada suhu 50-70oC. Pelarut yang sudah mengandung CO2 akan dialirkan ke dalam desorber. Desorber dipanaskan hingga 70-90oC agar CO2 yang terabsorp di dalam pelarut dapat dilepaskan kembali. Pelarut K2CO3 akan masuk kembali ke dalam Tangki Pelarut untuk digunakan kembali dalam proses absorpsi CO2, dan seterusnya. Pada percobaan diukur konsentrasi gas CO2 yang masuk ke dalam absorber, yang keluar dari absorber, dan yang tidak terserap oleh absorber dengan menggunakan CO2 Analyzer. Sedangkan laju alir gas CO2 yang masuk ke dalam absorber dan yang keluar dari absorber diukur dengan menggunakan Flowmeter Digital. Konsentrasi pelarut juga diukur pada titik-titik yang sama dengan menggunakan metode titrasi. Laju alir pelarut yang masuk ke dalam absorber pada percobaan ini adalah konstan, sedangkan laju alir gas CO2 yang masuk ke dalam absorber divariasikan pada laju alir gas CO2 sebesar 1,25 liter/menit, 1,5 liter/menit, dan 2 liter/menit. Hasil terbaik dicapai pada laju alir gas CO2 sebesar 1,5 liter/menit dan diperoleh efisiensi penangkapan gas CO2 sebesar 87,63%. CO2 capture using potassium carbonate solvent until now there are still weaknesses, namely the slow reaction rate. In this research, to overcome this weakness, boric acid promoter was used due to more economical and environmental friendly. Laboratory scale trial run was conducted with a continuous system, namely by bubbling CO2 (20%) into K2CO3 solution (30%) promoted by H3BO3 (3%) in the absorber at a temperature of 50-70oC. Solvent already containing CO2 would be transported into a desorber. The desorber was operated at temperature of 70-90oC causing the absorbed CO2 in the solvent can be released again. K2CO3 solvent will go back into the solvent tank for reuse in the process of absorption of CO2, and so on. In the experiment the concentration of CO2 that goes into absorber, which came out of the absorber, and that is not absorbed by the absorber were measured using a CO2 Analyzer. While the flow rate of CO2 gas that goes into and out of the absorber were measured using Digital Flowmeter. The concentration of the solvent is also measured at the same points using titration method. The flow rate of solvent into the absorber in the experiment are constant, while the flow rate of CO2 gas into the absorber was varied at a flow rate of 1.25 liters / min, 1.5 liters / minute, and 2 liters / minute , Best results are achieved in CO2 gas flow rate of 1.5 liters / minute and acquired CO2 capture efficiency of 87.63%.
MODELING AND SIMULATION OF CO2 ABSORPTION INTO PROMOTED AQUEOUS POTASSIUM CARBONATE SOLUTION IN INDUSTRIAL SCALE PACKED COLUMN Altway, Ali; Susianto, Susianto; Suprapto, Suprapto; Nurkhamidah, Siti; Nisa, Nur Ihda Farihatin; Hardiyanto, Firsta; Mulya, Hendi Riesta; Altway, Saidah
Bulletin of Chemical Reaction Engineering & Catalysis 2015: BCREC Volume 10 Issue 2 Year 2015 (SCOPUS Indexed, August 2015)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (73.759 KB) | DOI: 10.9767/bcrec.10.2.7063.111-124

Abstract

Carbon dioxide gas is a harmful impurity which is corrosive and it can damage the utilities and the piping system in industries. Chemical absorption is the most economical separation method which is widely applied in chemical industries for CO2 removal process. Hot potassium carbonate (K2CO3) is the most effective solvent that has been used extensively, especially for the CO2 separation process from gas synthesis and natural gas. This paper aims to develop mathematical model for investigating the CO2 absorption into promoted hot K2CO3 solution in industrial scale packed column in an ammonia plant. The CO2 was removed from the gas stream by counter-current absorption in two stages column. To represent the gas-liquid system, a rigorous mathematical model based on the two-film theory was considered. The model consists of differential mass and heat balance and considers the interactions between mass-transfer and chemical kinetics using enhancement factor concept. Gas solubility, mass and heat transfer coefficients, reaction kinetics and equilibrium were estimated using correlations from literatures. The model was validated using plant data and was used to compute temperature and concentration profiles in the absorber. The variation of CO2 recovery with respect to changes in some operating variables was evaluated. The effect of various kinds of promoters added into K2CO3 solution on the CO2 recovery was also investigated. The simulation results agree well with the plant data. The results of the simulation prediction, for the absorber pressure of 33 atm with a lean flow rate of 32,0867 kg/h, temperature of 343 K, and semi lean flow rate of 2,514,122 kg/h, temperature of 385 K, showed %CO2 removal of 95.55%, while that of plant data is 96.8%. © 2015 BCREC UNDIP. All rights reservedReceived: 3rd July 2014; Revised: 5th January 2015; Accepted: 19th Januari 2015How to Cite: Altway, A., Susianto, S., Suprapto, S., Nurkhamidah, S., Nisa, N.I.F., Hardiyanto, F., Mulya, H.R., Altway, S. (2015). Modeling and Simulation of CO2 Absorption into Promoted Aqueous Potassium Carbonate Solution in Industrial Scale Packed Column. Bulletin of Chemical Reaction Engineering & Catalysis, 10 (2): 111-124. (doi:10.9767/bcrec.10.2.7063.111-124) Permalink/DOI: http://dx.doi.org/10.9767/bcrec.10.2.7063.111-124 
THE OPTIMIZATION OF NATURAL GAS UTILIZATION NETWORK IN SINGLE REGION USING PINCH ANALYSIS METHOD Anugraha, Rendra Panca; Annasit, Annasit; Altway, Ali; Juwari, Juwari; Handogo, Renanto
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.