Jurnal Rekayasa Proses
Jurnal Rekayasa Proses is an open-access journal published by Chemical Engineering Department, Faculty of Engineering, Universitas Gadjah Mada as scientific journal to accommodate current topics related to chemical and biochemical process exploration and optimization which covers multi scale analysis from micro to macro and full plant size. Specialization topics covered by Jurnal Rekayasa Proses are: 1. Kinetics and Catalysis Includes simulations and experiments in reaction kinetics, catalyst synthesis and characterization, reactor design, process intensification, microreactor, multiphase reactors, multiscale phenomena, transfer phenomena in multiphase reactors. 2. Separation and Purification System Includes phase equilibrium, mass transfer, mixing and segregation, unit operation, distillation, absorption, extraction, membrane separation, adsorption, ion exchange, chromatography, crystallization and precipitation, supercritical fluids, bioprocess product purification. 3. Process System Engineering Includes simulation, analysis, optimization, and process control on chemical/biochemical processes based on mathematical modeling; multiscale modeling strategy (molecular level, phase level, unit level, and inter-unit integration); design of experiment (DoE); current methods on simulation for model parameter determination. 4. Oil, Gas, and Coal Technology Includes chemical engineering application on process optimization to achieve utmost efficiency in energy usage, natural gas purification, fractionation recovery, CO2 capture, coal liquefaction, enhanced oil recovery and current technology to deal with scarcity in fossil fuels and its environmental impacts. 5. Particle Technology Includes application of chemical engineering concepts on particulate system, which covers phenomenological study on nucleation, particle growth, breakage, and aggregation, particle population dynamic model, particulate fluid dynamic in chemical processes, characterization and engineering of particulate system. 6. Mineral Process Engineering Includes application of chemical engineering concepts in mineral ore processing, liberation techniques and purification, pyrometallurgy, hydrometallurgy, and energy efficiency in mineral processing industries. 7. Material and biomaterial Includes application of chemical engineering concepts in material synthesis, characterization, design and scale up of nano material synthesis, multiphase phenomena, material modifications (thin film, porous materials etc), contemporary synthesis techniques (such as chemical vapor deposition, hydrothermal synthesis, colloidal synthesis, nucleation mechanism and growth, nano particle dispersion stability, etc.). 8. Bioresource and Biomass Engineering Includes natural product processing to create higher economic value through purification and conversion techniques (such as natural dye, herbal supplements, dietary fibers, edible oils, etc), energy generation from biomass, life cycle and economic analysis on bioresource utilization. 9. Biochemistry and Bioprocess Engineering Includes biochemical reaction engineering, bioprocess optimization which includes microorganism selection and maintenance, bioprocess application for waste treatment, bioreactor modeling and optimization, downstream processing. 10. Biomedical Engineering Includes enhancement of cellular productions of enzymes, protein engineering, tissue engineering, materials for implants, and new materials to improve drug delivery system. 11. Energy, Water, Environment, and Sustainability Includes energy balances/audits in industries, energy conversion systems, energy storage and distribution system, water quality, water treatment, water quality analysis, green processes, waste minimization, environment remediation, and environment protection efforts (organic fertilizer production and application, biopesticides, etc.).
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273 Documents
<![CDATA[Sintesis selulosa asetat dari limbah daun nanas memanfaatkan DES CHCL-OA untuk meningkatkan ekstraksi selulosa sebagai bahan filter masker kain ]]>
<![CDATA[Puji Nurhidayah]]>;
<![CDATA[Anggun Puspitarini Siswanto]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 18 No 2 (2024): Volume 18, Number 2, 2024 ]]>
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DOI: 10.22146/jrekpros.13255
<![CDATA[Selulosa asetat adalah senyawa organik yang terbentuk dari substitusi gugus hidroksil pada selulosa dengan gugus asetil. Senyawa ini memiliki potensi sebagai bahan baku untuk filter masker. Sintesis selulosa asetat dilakukan dengan mereaksikan senyawa selulosa dengan anhidrida asetat. Penelitian ini memodifikasi metode yang telah dilakukan oleh peneliti sebelumnya dengan menggunakan DES ChCl-OA dalam proses isolasi selulosa dari daun nanas. Tahapan penelitian meliputi persiapan daun nanas dan DES ChCl-OA, isolasi selulosa, pengujian kadar selulosa dan lignin, sintesis selulosa asetat, karakterisasi selulosa asetat, dan pembuatan filter. Selulosa daun nanas hasil preparasi menggunakan DES ChCl-OA menunjukkan kemampuan untuk mengisolasi sekitar 57,38% dari total selulosa yang terkandung dalam serat daun nanas. Selanjutnya, isolat selulosa tersebut diasetilasi menggunakan anhidrida asetat dengan variasi percobaan tertentu, dan menghasilkan selulosa asetat terbaik untuk pembuatan filter dengan yield antara 79,6-80,6%, kadar asetil sekitar 40,74-40,96%, dan DS (Degree of Substitution) sebesar 2,56. Variabel anhidrida asetat sebanyak 17,5 mL dan waktu asetilasi selama 1,5 jam memberikan hasil terbaik. Modifikasi pada proses persiapan serat limbah daun nanas menggunakan DES ChCl-OA terbukti efektif dan efisien dalam mengisolasi senyawa selulosa. Hasil penelitian terbukti memberikan hasil lebih baik daripada sebelumnya.]]>
<![CDATA[Enzymatic saccharification of liquid sugar from cassava peel starch: Optimization and characteristics ]]>
<![CDATA[Maulidia, Indah]]>;
<![CDATA[Rina, Oktaf]]>;
<![CDATA[Shintawati]]>;
<![CDATA[Elsyana, Vida]]>;
<![CDATA[Ramandani, Adityas Agung]]>;
<![CDATA[Siti Purnani, Mawar]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 18 No 2 (2024): Volume 18, Number 2, 2024 ]]>
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DOI: 10.22146/jrekpros.13727
<![CDATA[The province of Lampung generated 2.6 million tons of cassava and 0.28 million tons of inner cassava peel waste in 2020. This demonstrates that the value of production is closely correlated with the amount of trash generated. 44-59% starch is still present in the waste from the inside of cassava peels, and this starch can be used as an input to make liquid sugar. Using the Response Surface Methodology (RSM) tool, this study attempts to optimize the saccharification process with modifications in duration (2, 4, and 8 h) and temperature (55, 60, and 65°C). Liquification and saccharification are the enzymatic processes used to make liquid sugar from cassava peel. According to study findings, the starch yield from cassava peels was 11.54%, with corresponding levels of water, ash, starch, and crude fiber of 13.53, 0.61, and 88.32%, and 1.025%, respectively. The yield of liquid sugar obtained from saccharification of cassava peel starch is 58.36%. The water and ash contents are 58.07, 16.95, and 0.11%, respectively, with the quality of lowering sugar content. Using the RSM approach, this study was able to optimize the saccharification process of liquid sugar from cassava peel starch at a temperature of 67.07 °C and a time variation of 6.8 hours. The optimized conditions resulted in a higher yield of liquid sugar from cassava peel starch. This study highlights the potential of utilizing cassava peels as a valuable source for liquid sugar production.]]>
<![CDATA[Simulation and evaluation of fuel distribution line from fuel terminal Tuban into integrated terminal Perak at PT Pertamina MOR V through ASPEN Plus® modeling ]]>
<![CDATA[Budiman, Yosef]]>;
<![CDATA[Pratiwi, Dwita Cahaya]]>;
<![CDATA[Rofiqah, Umi]]>;
<![CDATA[Puspasari, Ifa]]>;
<![CDATA[Wibowo, Yudha Whastu]]>;
<![CDATA[Khotip, Moh.]]>;
<![CDATA[Vebriono, Hendrix Eko]]>;
<![CDATA[Hidayat, Arif]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 18 No 2 (2024): Volume 18, Number 2, 2024 ]]>
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DOI: 10.22146/jrekpros.14106
<![CDATA[This research aims to 1) to determine operating conditions that correspond to the amount of fuel needed to be distributed, 2) visualize the profile of pressure changes with pipe distance, and 3) compare actual conditions with simulated conditions. The research method consists of simulation of energy loss in the form of pressure drop for each type of fuel oil (gasoline and gasoil) using ASPEN Plus® software. Research results show that a greater pump pressure of 87 bar is required to distribute gasoil, compared to gasoline which only uses 82 bar to reach ideal atmospheric pressure at 750 m3/hour. Reduction in fuel pumping pressure is close to linearity, where pumping pressure will continue to decrease as piping distribution distance increases. % error is obtained by comparing the simulation results with the industrial standard which is evidenced by % error of 7.69 (moderate) in the type of gasoline fuel and % error value of 1.81 (strong) in the type of gasoil fuel. This research has been in accordance with the real conditions in the field, so it can predict the right conditions to maximize the process.]]>
<![CDATA[Increasing The Strength of Cellular Lightweight Concrete Bricks with The Addition of Bamboo Fiber ]]>
<![CDATA[Magnolia, An-Nisa]]>;
<![CDATA[Akmal, Jamiatul]]>;
<![CDATA[Martinus, Martinus]]>;
<![CDATA[Savetlana, Shirley]]>;
<![CDATA[Helmi, Masdar]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 18 No 2 (2024): Volume 18, Number 2, 2024 ]]>
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DOI: 10.22146/jrekpros.15320
<![CDATA[This research aims to obtain technology for improving the quality of CLC (Celullar Lightweight Concrete) bricks to be equivalent to AAC (Autoclaved Aerated Concrete). This is a response to the rapid development, especially in the property sector, which is followed by the increasing need for bricks as the main material for building walls. CLC bricks are an alternative product other than red bricks that have the potential to pollute the environment because in the production process there is burning. The problem is that the quality of CLC bricks is relatively lower compared to AAC bricks. The method is to add bamboo fiber as a reinforcement and optimize the elements. The design of the experiment was made using the Taguchi Method, but preliminary experiments had previously been carried out to predict the percentage of elements. The research includes manufacturing process technology and quality testing on samples. Bamboo fiber-reinforced CLC bricks are obtained with an optimal composition of 0.5% fiber and a ratio of cement mass to sand mass of 1:1.6. This sample has a compressive strength of 1.1235 MPa and a bending strength of 1.1723 MPa. From this composition, samples were obtained with an average compressive strength of 1.1285 MPa and an average bending strength of 1.3551 MPa. Thus, it can be concluded that the addition of fiber can increase the strength of CLC bricks to be equal to or stronger than AAC bricks on the market.]]>
<![CDATA[Pemanfaatan tandan kosong kelapa sawit dari produksi pabrik kelapa sawit Cikasungka sebagai alternatif pembuatan tinta printer ]]>
<![CDATA[Gunawan, Dandi Syahrul]]>;
<![CDATA[Pardosi, Ridho]]>;
<![CDATA[Widodo, Timbul]]>;
<![CDATA[Iqbal, Muhammad]]>;
<![CDATA[Africia, Nabillah Dwi]]>;
<![CDATA[Sandi, Aris]]>;
<![CDATA[Saputri, Lestari Hetalesi]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 18 No 2 (2024): Volume 18, Number 2, 2024 ]]>
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DOI: 10.22146/jrekpros.15659
<![CDATA[Tandan Kosong Kelapa Sawit (TKKS) merupakan limbah organik yang sangat banyak dijumpai diperkebunan kelapa sawit. TKKS memiliki nilai guna yang cukup tinggi karena terdapat kandungan serat di dalamnya. Namun, pemanfaatan TKKS di Pabrik Kelapa Sawit (PKS) masih sebatas sebagai pupuk. Oleh karena itu, pada riset ini dilakukan pemanfaatan kelapa sawit sebagai bahan baku pigmen organik untuk pembuatan tinta printer. Pigmen organik pada riset ini dibuat melalui beberapa tahapan, antara lain penghalusan bahan dengan parang, pengeringan dengan sinar matahari, proses karbonisasi (pengarangan) pada suhu 450oC menggunakan serangkaian alat karbonisasi, penghalusan arang (karbon) TKKS, pengayakan serbuk karbon dengan screen mesh T200 dan tahap pembuatan tinta printer dilakukan melalui pencampuran karbon TKKS dengan aquadest, alkohol, dan gum arab. Tinta yang dihasilkan akan diuji viskositas, uji transmitansi cahaya, uji adhesi, uji densitas, dan uji performa tinta. Hasil riset ini menunjukkan bahwa produk tinta printer terbaik didapatkan pada komposisi massa 2 g karbon dengan 5 mL alkohol, yang dicampur dengan bahan perekat berupa 3,5 g gum arab dalam 22,5 mL aquadest. Hasil uji cetak, transmitansi dan adhesi telah sesuai dengan Standar Nasional Indonesia (SNI) namun untuk uji viskositas perlu diteliti lebih lanjut.]]>
<![CDATA[Optimization of gembili (Dioscorea esculenta L.) starch partial hydrolysis in maltodextrin production with microwave assist using acetic acid catalyst ]]>
<![CDATA[Shalihin, Muhammad Zaki Riadhus]]>;
<![CDATA[Paramita, Vita]]>;
<![CDATA[Sitio, Septi Enjelina]]>;
<![CDATA[Nurlaili, Fitri Dwi]]>;
<![CDATA[Ariyanto, Hermawan Dwi]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 18 No 2 (2024): Volume 18, Number 2, 2024 ]]>
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DOI: 10.22146/jrekpros.83823
<![CDATA[The purpose of this study was to determine the optimal conditions for partial hydrolysis of gembili starch in the maltodextrin production. Novelty of this research is the use of acetic acid as a substitute for commonly used acids and microwaves for process efficiency. The process of maltodextrin production includes raw material pretreatment, gelatinization, liquefaction, drying and analysis. Variations in liquefaction time (30, 40, 50 min), microwave power (300, 400, 500 W) and acetic acid concentration (14, 15, 16 %) were used as independent variables. The equivalent dextrose analysis results were 9.389 ± 0.042 to18.980 ± 0.201%, the density analysis results were 1.059416 to 1.107796 g/ml and viscosity analysis results were 0.430554 to 0.974663 cP. This study produces that 96.705% of the total variability in response can be explained in the regression equation. Critical value of this study estimated dextrose equivalent value of maltodextrin produced of 16.636% and the validation of it is 16.254 ± 0,074%.]]>
<![CDATA[Analisis tekno-ekonomi proses pemisahan fraksi jenuh dan fraksi tak jenuh dari distilat asam lemak sawit ]]>
<![CDATA[Halim, Fadhli]]>;
<![CDATA[Indarto, Antonius]]>;
<![CDATA[Putrawan, I Dewa Gede Arsa]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 19 No 1 (2025): Volume 19, Number 1, 2025 ]]>
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DOI: 10.22146/jrekpros.16251
<![CDATA[Palm fatty acid distillate (PFAD) can be used as a raw material for two types of polyvinyl chloride (PVC) thermal stabilizers: organotin and mixed organometal. To produce high-quality thermal stabilizers, PFAD must first be separated into saturated and unsaturated fractions. This research aims to develop and analyze the techno-economics of separating these fractions from PFAD through solvent crystallization using methanol. The study began with the development of a process flow diagram, including the selection of unit operations and equipment. Mass and energy balances for the developed process were then calculated. Investment and production costs were estimated and used to determine economic indicators. These calculations were performed using Aspen Plus and Aspen Hysys software. Utility requirements were primarily driven by solvent evaporation and condensation. From an environmental perspective, higher crystallization temperatures are preferable due to reduced fuel consumption and lower CO2 emissions. However, higher crystallization temperatures resulted in a less pure unsaturated fraction, despite producing a larger quantity. The estimated investment for constructing a separation plant with the studied capacity and crystallization temperature range was between 13.6 and 13.9 million USD. Among the equipment, fired heaters and refrigeration compressors contribute the most to costs. The separation process at temperatures of -15°C and 0°C was found to be economically viable, with internal rates of return (IRR) of 36% and 49%, respectively. In contrast, the separation process at 10°C was not economically feasible. The findings of this study are expected to serve as a reference for the development of commercial-scale processes.]]>
<![CDATA[Perbedaan struktur molekul karet alam dengan proses termal koagulan berdasarkan analisis FTIR ]]>
<![CDATA[Achmad, Feerzet]]>;
<![CDATA[Simbolon, Yusril Mahendra]]>;
<![CDATA[Sinaga, Kristomi Yahya]]>;
<![CDATA[Az-Zahra, Syifa]]>;
<![CDATA[Yuniarti, Reni]]>;
<![CDATA[Bindar, Yazid]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 19 No 1 (2025): Volume 19, Number 1, 2025 ]]>
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DOI: 10.22146/jrekpros.11875
<![CDATA[Rubber is one of the most potential and abundant biological natural resources in Indonesia. This research was conducted to determine the content of compounds contained in rubber after coagulation by means of thermal coagulants. There are 2 (two) thermal coagulants used, traditional using firewood and modern using a laboratory oven. Variations in the weight of the latex used were 0.5 kg, 0.75 kg, 1 kg, 1.25 kg and 1.5 kg. Then the results of the thermal coagulant were subjected to the Fourier Transform Infrared (FTIR) test to see the compound content contained in the rubber. The results of the FTIR test on traditional thermal coagulants at high and medium heat and modern thermal coagulants in the oven showed the typical functional groups of rubber, namely the presence of C-H, C=C and C-C carbon bonds.]]>
<![CDATA[Filtrasi limbah batik Kutawaru Cilacap menggunakan fly ash yang diaktivasi asam sulfat ]]>
<![CDATA[Manasikana, Arina]]>;
<![CDATA[Ramadhani, Arnesya]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 19 No 1 (2025): Volume 19, Number 1, 2025 ]]>
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DOI: 10.22146/jrekpros.11219
<![CDATA[The batik industry is one of the largest contributors to liquid waste. Batik liquid waste if not treated properly has the potential to increase disease and pollute the environment. Pollutant levels contained in the waste can be degraded by using fly ash as an adsorbent. Fly ash is obtained from Steam Power Plant waste. The purpose of this study was to determine the best concentration of sulfuric acid between 1M and 3M added to activate fly ash to reduce COD, BOD, TSS, color change and pH of Kutawaru batik waste. The research consisted of three stages: the first stage was the activation of fly ash by immersing it in a solution of 1M and 3M sulfuric acid with a ratio of 1:5 for 3 hours. Then, wash with water until the pH is neutral. Furthermore, the fly ash was dried using an oven at 105oC for 4 hours to a constant weight, resulting in sulfuric acid-activated fly ash. The second stage of the adsorption process, where batik waste was mixed with sulfuric acid-activated fly ash in a ratio of 5:1 for 3 hours, resulted in the waste after adsorption. In the last stage, testing of the waste before and after adsorption was carried out at the Cilacap Environmental Laboratory. The results showed that the best concentration of sulfuric acid for the activation of fly ash was 1M because it reduced COD, BOD and TSS by up to 90%. Changes in COD, BOD, TSS, color and pH of batik waste before and after adsorption using 1 M sulfuric acid-activated fly ash, namely COD 13678 mg/L to 1302 mg/L, BOD 8480 mg/L to 870 mg/L, TSS 460 mg /L becomes 47 mg/L, the color of the batik waste changes from black to yellow, and pH 9 becomes 7.]]>
<![CDATA[Thermogravimetric Analysis of Indonesian Low-Rank Coal: Optimization of Drying Temperature and Kinetic Modeling ]]>
<![CDATA[Haq, Shofa Rijalul]]>;
<![CDATA[Shafiyurrhaman, Muhammad Faiz]]>;
<![CDATA[Kurniawan, Ade]]>;
<![CDATA[Prasetyo, Yuda]]>;
<![CDATA[Prasetyo, Imam]]>;
<![CDATA[Jeon, Sanghee]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 19 No 1 (2025): Volume 19, Number 1, 2025 ]]>
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DOI: 10.22146/jrekpros.18102
<![CDATA[Drying high-moisture of low rank coal in the mining sector is essential for increasing energy efficiency and ensuring stability in its use as an energy source. This study aims to determine the optimal drying temperature and kinetic parameters for Indonesian low rank coal (i.e., lignite and sub-bituminous) using thermogravimetric analysis (TGA) under both isothermal and non-isothermal conditions. Coal samples were tested at three heating rates (5, 10, and 20°C/min) and three fixed temperatures (150, 200, and 250°C). Several drying kinetics models, including the Newton, Henderson and Pabis, Logarithmic, and Page models, were used to evaluate the drying characteristics of both coal types. The results indicate that the Page model provided the best fit, with the highest ?2 value and the lowest ?2 value, making it the most accurate model for describing coal drying rates under various conditions. The optimal drying temperature for lignite was 83.04°C, with an activation energy of 3224.04 J/mol, while for sub-bituminous coal, the optimal temperature was 109.65°C with an activation energy of 17972.83 J/mol. These findings support the optimization of the drying process in the industry, particularly for efficiently reducing coal moisture content without compromising energy quality.]]>
