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Iwan Ridwan
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INDONESIA
FLUIDA
Published by Politeknik Negeri Bandung
ISSN : 14128543     EISSN : 27237680     DOI : https://doi.org/10.35313/fluida
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science Materials Science & Nanotechnology
FLUIDA (FLD, ISSN: 1412-8543, e-ISSN: 2723-7680) is a science and technology journal that contains articles taken from laboratory research results, simulation results of problems, conceptual analysis (the study of problem-solving in writing) about the production process, troubleshooting, and maintenance as well as results of studies/evaluations of the performance of a system process, especially in the fields of Chemical Engineering, Sustainable and Renewable Energy, Bioprocess Technology, and Food Technology.
Arjuna Subject : Teknik Kimia (semua kategori) - Teknik Kimia (Lain-Lain)
Articles 122 Documents
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The Impact of Bifunctional Catalyst Synthesis Method Cu/ZnO/ZrO2/Al2O3-HZSM-5 on Dimethyl Ether Production from CO2 and H2 Alfiana Adhitasari; Fitria Yulistiani; Tufana Muhallik Jahulan; Fauzan Fadhillah
Fluida Vol 17 No 1 (2024): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v17i1.4782

Abstract

Indonesia has initiated a zero-carbon emission plan; one strategy is to replace Liquid Petroleum Gas (LPG) with eco-friendly fuels like Dimethyl Ether (DME). However, high Operational Expenditure (OPEX) for CO2 conversion technology poses a challenge. This research aims to address these techno-economic barriers by examining how catalyst synthesis methods, specifically Ultrasonic (US) and coprecipitation (CP), impact the performance of the bifunctional catalyst Cu/ZnO/Zr/Al2O3 – H+ Zeolite Socony Mobil-5 (CZZA-HZSM-5) in DME synthesis. The catalysts are characterized using the Brunauer-Emmett-Teller (BET) method and tested in a fixed-bed reactor at 240°C and 27.6 bar, followed by a bubble reactor containing methanol. Gas Chromatography-Mass Spectrometry (GC-MS) is used for analysis. The US method produces catalysts with higher surface area, pore volume, and average pore diameter than the CP method, with values of 45.93 m²/g, 0.3822 cc/g, and 1.6646 nm, respectively. Correspondingly, the US catalyst shows higher CO2 conversion and methanol yield, at 13.3% and 59.7%. DME as the final product is undetected in GC-MS analysis, likely due to differences in HZSM5 specifications, high reaction rates, and ΔG values above 1. This study enhances understanding of how catalyst synthesis methods affect CO2 conversion efficiency, crucial for developing sustainable fuel alternatives.
Efektivitas Katalis Heterogen Fly Ash (FA-SO3H) pada Sintesis Biodiesel dari Palm Fatty Acid Distillate Abdulloh, Sudrajat Harris; Andrijanto, Eko; Saripudin, Saripudin; Putri, Anindya Indrita; Nurul, Dhea; Elizabeth, Lidya
Fluida Vol 17 No 1 (2024): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v17i1.5286

Abstract

The increase in fuel use along with the decline in production of petroleum exploration activities encourages efforts to find alternative fuels, one of which is biodiesel from PFAD (Palm Fatty Acid Distillate) with production reaching 6,000,000 tons while its utilization is still low. Biodiesel production from PFAD using Fly ash (FA)-SO3H catalyst which is a heterogeneous catalyst through esterification method. FA used in this study was wet impregnated using 6M sulfuric acid (H2SO4) for 24 hours, so that the highest acid concentration was obtained at a calcination temperature of 500 ⁰C of 1.1654 mmol/gram. The research was conducted with Response Surface Method (RSM) with Box Behnken Design model in Design Expert 13 software and 13 runs were obtained. The resulting model from RSM was obtained as optimum conditions at catalyst loading (%-w) 5-10, methanol:PFAD molar ratio (n/n) 10:1-30:1, reaction time 3-5 hours and temperature 60 ⁰C. Based on the experimental results and ANOVA, the high conversion is influenced by the high catalyst loading and methanol:PFAD ratio (n/n), with the conversion obtained of 72.89% at catalyst loading of 10%-w, methanol:PFAD molar ratio of 20 (n/n) and time for 5 hours.
Potential of Reducing CO2 Emission Using Parabolic Trough Collector for 13.75MW Desalination Processes Arya Krisnatama I Putu; Sri Paryanto Mursid; Sri Widarti
Fluida Vol 16 No sp1 (2023): FLUIDA x IRWNS Special Edition
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v16isp1.5311

Abstract

Desalination is an important process in fulfilling the freshwater demands of both the industrial sector and human needs. Typically, thermal desalination processes rely on fossil fuels to minimize production costs. However, using fossil fuel in desalination contributes to releasing CO2 emissions into the atmosphere. Therefore, it is essential to utilize renewable energy sources to mitigate the production of CO2 emissions. To reduce CO2 emissions research has been conducted to explore the potential use of parabolic trough solar collectors in harnessing available solar energy at the power plant site for thermal desalination processes which required 13.75 MW of thermal energy. The study utilized the system advisor model software to assess the collector’s system performance. The research findings indicate that 416 units of parabolic trough solar collectors are required to fulfill the thermal power needs. The presence of these solar collectors has the potential to generate 26.06 GWh of thermal power, thereby reducing coal consumption by 5,740.4 metric tons per year and directly lowering CO2 emissions by 13,892 metric tons per year.
The Influence of Tube Thickness on the Shell Side of the Air preheater As a Form of Corrosion Prevention Kinanti Ulyasa; Slameto Slameto; Sri Widarti
Fluida Vol 16 No sp1 (2023): FLUIDA x IRWNS Special Edition
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v16isp1.5326

Abstract

Air preheater as a heat recovery technology is generally applied in the powerplant industry and used to heat combustion air, which increases the efficiency of the combustion chamber in the boiler. In this case, air preheater has tubular recuperative type typically located at the bottom of the circulating fluidized boiler for utilizing the lowest temperature exhaust gas. A significant presence of SO2 in the exhaust gas can lead to cold-end corrosion and cause leaks. The low tube thickness in the air preheater provides a good heat transfer performance unfortunately the corrosion issue has not been considered. By increasing the tube thickness, its aimed to extend the life time of the tubes with good corrosion resistance. This study is performed with calculations using empirical equations and validated results using Heat Transfer Research Inc (HTRI) software. Increasing the tube thickness impacts decreasing the heat transfer coefficient, increasing the flue gas (shell) pressure drop, and increasing the fouling factor. The tube thickness which determined for the corrosion prevention design of the air preheater give an overdesign of 18.14%, a heat transfer rate coefficient of 1.726 Btu/hr. ft2. °F, a shell pressure drop of 0.000541 psi, and a fouling factor of 0.114 hr. ft2. °F/Btu.
Sintesis Biodiesel dari Limbah Biji Alpukat melalui Proses Esterifikasi dan Transesterifikasi Herawati Budiastuti; Aisyah Auliya Rahmawati; Susy Mardiana Susanto; Dhyna Analyes Trirahayu; Rusdianasari Rusdianasari
Fluida Vol 16 No sp1 (2023): FLUIDA x IRWNS Special Edition
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v16isp1.5342

Abstract

The avocado seed is a food waste that contains vegetable oil. The amount of avocado seed waste is very abundant, but there is no optimal processing or utilization. Fossil fuels as an energy source can experience scarcity because these energy sources are non-renewable. This research has important implications in waste management and development of renewable energy sources. One type of renewable energy is biodiesel. Biodiesel is an environmentally friendly alternative fuel made from vegetable oil. The use of biodiesel as an alternative fuel has advantages including being easier to decompose in nature and reducing emissions when compared to diesel oil. One type of plant that can be used as raw material for making biodiesel is avocado. This study aims to utilize avocado seed waste as a raw material for biodiesel synthesis and to test its characteristics that have not been found in previous studies in the form of analysis of acid value, density, and oxidation stability. The method used in the synthesis of biodiesel was esterification and transesterification reactions using methanol solvent with a mole ratio of avocado seeds to methanol of 1:6 and the addition of H2SO4 catalyst as much as 0.5% of the weight of oil for the esterification process and the addition of NaOH catalyst as much as 1% of the weight of oil for the transesterification process. This study complements previous research on biodiesel from avocado seeds and compares the obtained biodiesel characteristics to the Indonesian National Standard (SNI) 04-7182:2015. The final results of this study were 34,61%, 0.98 mg-KOH/g, 977 kg/m3, and 318 minutes for biodiesel yield, acid value, density, and oxidation stability, respectively.
The Effect of Papaya Leaf Concentration and Fermentation Time on The Decafeination Process of Robusta Coffee Tri Hariyadi; Keryanti Keryanti; Nurisa Salsabila; Sarah Sarah
Fluida Vol 16 No 2 (2023): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v16i2.5441

Abstract

High level of caffeine in Robusta coffee requires the reduction of level to accommodate person with low caffeine tolerance. The wet fermentation process with papaya leaf extract containing the papain enzyme was used to decaffeinate the coffee. This study aimed to investigate the effects of papaya leaf extract concentration and sampling time on the decaffeination of Robusta coffee green beans. The papaya leaf extract concentration ranged from 10% to 80% (w/v), with fermentation lasting 6 to 72 hours. The caffeine content was measured using a UV-Vis spectrophotometer, and organoleptic tests were performed on 40 untrained panelists. The results showed that both the concentration of papaya leaf extract and the fermentation time influenced the decaffeination. The optimum result was obtained after 48 hours of fermentation with 80% (w/v) papaya leaf extract resulting in a caffeine content of 0.268% (w/w) from an initial content of 1.20% (w/w), representing a 77.82% decrease in caffeine level efficiency. Fermented coffee was preferred by 58% of panellists over unfermented coffee. These findings imply that papain found in papaya leaves can reduce caffeine levels while also improving flavor and aroma.
Effect of Water Hyacinth’s Particle Size as Additional Substrate to the Leachate Anaerobic Bioreactor Laily Isna Ramadhani; Dewi Widyabudiningsih; Feri Wirawan; Aditya Almarnugraha; Sinta Setyaningrum
Fluida Vol 17 No 1 (2024): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v17i1.5503

Abstract

Municipal solid waste leachate contains landfill-produced organic contaminants. Leachate with the high organic content pottentially pollute nearby waterways. The high content of pollutants in leachate is represented by the measured Chemical Oxygen Demand (COD) content. Therefore, leachate was carried out using the anaerobic method. The anaerobic approach was chosen because it can process high-organic waste and produce biogas, in which methane in biogas may be used as renewable energy. Leachate from old landfills is heavy in nitrogen, thus to optimize the anaerobic process, it must be mixed with high-carbon substrates. Water hyacinth, a fast-growing plant with a high carbon content, is a weed because it pottentially damage the ecosystem. This research begins by comparing the anaerobic reactor with a single substrate of leachate and a mixed substrate (leachate and water hyacinth). Water hyacinth was added with size variations of 1 mm; 5 mm; 10 mm; and 15 mm. From the four variations, the mixed substrate reactor had a higher COD reduction efficiency than the single substrate in all water hyacinth sizes. The optimum particle size of water hyacinth is 1 mm, resulted the highest COD reduction efficiency of 81% and the highest biogas cummulative volume of 4,230 mL. The addition of water hyacinth as an additional substrate statisticaly proven has a strong correlation to the increasing efficiency of COD removal compared to the biogas production.
Effect of Diameter on Steam Pressure Sootblower to Eliminate Low Potential Slagging and Fouling Abigail Qutratuain Prabaswara; Ika Yuliyani; Sri Widarti
Fluida Vol 16 No sp1 (2023): FLUIDA x IRWNS Special Edition
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v16isp1.5594

Abstract

The combustion process in pulverized coal boilers utilizes coal fuel, which produces ash and heat. Ash from combustion process will be deposited and adhere to pipes, known as slagging and fouling. Cleaning of slagging and fouling is done using a sootblower by flowing pressurized fluid to generate a jet nozzle force, which can remove the slagging and fouling adhering to the pipes in the superheater. Based on testing of parameters, ash fusion temperature is 1415.42 oC, and silica ratio is 79.55%, indicating a low potential for slagging. For fouling testing yielded an index of 0.089, indicating a low potential for fouling. The existing retractable sootblower operates using superheated steam with a pressure of 70-75 bar. In the design of low-pressure sootblower, flow is derived from intermediate pressure turbine by modifying feed tube, lance tube, and sootblower nozzle. The design results in a feed tube diameter of 101.65 mm, a lance tube diameter of 114.3 mm, an inlet nozzle diameter of 21.1 mm, a throat nozzle diameter of 13.97 mm, and an outlet nozzle diameter of 41.02 mm, with a Mach number output of 2.09 and a total jet force of 2023.9 N.
Correlation of Steam Velocity and Pipe Diameter with Heat Transfer Performance on 120° Half-Pipe Jacket Sri Widarti; Irma Galuh Rahayu; Sapto Prayogo
Fluida Vol 16 No sp1 (2023): FLUIDA x IRWNS Special Edition
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v16isp1.5595

Abstract

Double jacket mixing tanks offer temperature control and versatility for industrial processes where temperature-sensitive materials need to be mixed, stored, or processed. The selection of the appropriate jacket type in a double-jacket mixing tank is based on the structural strength and the optimal heat transfer performance. The type of jackets can be conventional, dimple, and half-pipe. The conventional jacket is easier to manufacture, but it is not resistant to high temperature and pressure. The dimple jacket has good heat transfer, but it is susceptible to damage. The half-pipe jacket has good structural strength, but its heat transfer is affected by the central angle and pipe diameter. 120° central angle has greater heat transfer and pressure drop than 180° central angle. In order to determine the effects of steam velocity on heat transfer performance, heating time, and pressure drop of the 120° half-pipe jacket, research occurred on pipes with 2, 2.5, and 3 inches of diameter. The calculating method of heat transfer in agitated jacketed vessels is applied to visualize the relationships. The effects of steam velocity on heat transfer, heating duration, and pressure drop respectively are polynomials of order 2, power, and polynomials of order 2 with an average R2 close to 1. The greater R2, the better the relationship between two variables, according to the equation. The 120° half-pipe jacket performance will be highly effective, with 1774 W, 2.1 minutes heating duration, 8.94 kPa pressure drop if the steam velocity is 10.50 m/s with 2.5 inches pipe diameter.
Effect of Changes Turbidity on Oxygen Solubility in Fish Pond Water Electrocoagulation Process Sutanto Sutanto; Toto Supriyanto; Danang Widjajanto
Fluida Vol 16 No sp1 (2023): FLUIDA x IRWNS Special Edition
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v16isp1.5596

Abstract

The water used for fish farming by the Mina Lestari is very dirty, because many soil particles are dissolved in water. The water with high dirty in generally has very high turbidity. So that oxygen is difficult to dissolve in water and is not sufficient for fish life. So many fish die, due to insufficient oxygen for breathing. To reduce water turbidity is treated by electrocoagulation process combined with the aeration process. The aim of the research was to study the effect of changes in turbidity on dissolved oxygen in water. The study began by measuring the turbidity using a turbidimeter and dissolved oxygen using a DO meter. Furthermore, pour 10 liters of water into the electrocoagulation process tank. The electrocoagulation was carried out at 12 volt or 0,3 ampere for 10 minutes. The process was stopped, then the water flowed into the settling tank and left for 30 minutes to precipitate of the dirt. The water flowed into a holding tank and followed aeration process by flowing air at a rate of 500 cc per minute for 30 minutes. Then followed measuring turbidity by turbidimeter and dissolved oxygen by DO meter. Subsequent studies were carried out using the same procedure with an interval of 10 minutes processing time for electrocoagulation process. The results showed that an increase in processing time can reduce water turbidity from 68 NTU to 45 NTU or 33.82% and increase dissolved oxygen from 2.8 mg/L to 5.3 mg/L or 89.29% at 50 minutes processing.

Page 11 of 13 | Total Record : 122

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