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.).
Articles
273 Documents
<![CDATA[Pengaruh jenis limbah dan rasio umpan pada biokonversi limbah domestik menggunakan larva black soldier fly (Hermetia illucens) ]]>
<![CDATA[Mahfudl Sidiq Muhayyat]]>;
<![CDATA[Ahmad Tawfiequrrahman Yuliansyah]]>;
<![CDATA[Agus Prasetya]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 10 No 1 (2016): Volume 10, Number 1, 2016 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.34424
<![CDATA[The high content of protein is the main reason for domestic waste to be potentially processed by bioconversion using Hermetia illucens larvae. Hermetia illucens larva can accumulate protein content as high as 45-50% and fat which reaches 24-30%, so that it becomes a good source of highly nutritious feed. This research studied the production of Hermetia illucens larvae through bioconversion process on rice waste, cassava leaf, and mixed rice-cassava leaf (with the weight ratio of 1: 1), by varying the feed rate of 60, 80, and 100 mg/larva/day. The experiment was conducted for 21 days. Samples were taken periodically to be analyzed for their weight, substrate consumption, and waste reduction index. Proximate analysis was conducted on raw material and larvae media. The results of this study indicated that the optimum waste for larvae was the mixed rice-cassava leaf waste with feed rate of 60 mg/larva/day or total weight of 10.00 grams per feeding. At this condition, the optimal waste reduction in the bioconversion process was observed as substrate consumption of 65.82% and the waste reduction index of 18.02%.]]>
<![CDATA[Integrasi proses elektrokoagulasi-elektrooksidasi sebagai alternatif dalam pengolahan limbah cair batik zat warna naftol ]]>
<![CDATA[Fikry Nashrullah K]]>;
<![CDATA[Muslikhin Hidayat]]>;
<![CDATA[Moh. Fahrurrozi]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 10 No 1 (2016): Volume 10, Number 1, 2016 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.34425
<![CDATA[The production of batik produces wastewater which contains mixture of complex organic macromolecules. In this study, a sequential process of electrocoagulation-electrooxidation (EC-EO) using electrodes of aluminium-graphite and PbO2-graphite was proposed as an alternative method for treating wastewater of naphthol from batik dyeing process. The effects of parameter of current density of in the range of 3.7-7.90 mA/cm2, and the effect of electrical voltage to the decrease of color intensity. The electrocoagulation-electrooxidation method was carried out in a batch reactor with a capacity of 1.3 L, where the first 20 minutes is the electrocoagulation process and the next 100 minutes is the electrooxidation process. The samples were drawn at 10, 20, 40, 60, 80, 100 and 120 minutes and their color intensity was analyzed using spectrophotometric method. The results showed that the highest decreased value was at 99,78% at the current density (7,53 mA/cm2) during 120 minutes with electricity consumption 14,40 kWh/m3. The higher the density of the current, the greater the decrease value of color intensity in the liquid naphthol waste.]]>
<![CDATA[Kinetika adsorpsi nikel (II) dalam larutan aqueous dengan karbon aktif arang tempurung kelapa ]]>
<![CDATA[Ardelita Adiningtyas]]>;
<![CDATA[Panut Mulyono]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 10 No 2 (2016): Volume 10, Number 2, 2016 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.33335
<![CDATA[The adsorption kinetics of nickel (II) in aqueous solution with activated carbon from coconut shell was studied by measuring the nickel concentration in the solution (C) as a function of time (t). The parameters studied in this study were adsorption temperature (T), particle diameter of activated carbon (d), and mass ratio of activated carbon to aqueous solution (r). It was found that the adsorption rate increased with the increase of the adsorption temperature and the mass ratio of activated carbon to aqueous solution. On the contrary, it was found that the rate of adsorption decreased with increasing the particle diameter of the activated carbon.]]>
<![CDATA[Pengaruh variasi organic loading rate sampah buah jeruk terhadap produksi biohidrogen pada reaktor kontinu ]]>
<![CDATA[Baruna Sakti Wicaksono Bonanza]]>;
<![CDATA[Sarto Sarto]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 10 No 2 (2016): Volume 10, Number 2, 2016 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.33336
<![CDATA[Biohydrogen is a potential alternative energy generated through the process of dark fermentation of organic waste. This research aims to determine the effect of organic loading rate (OLR) variations of orange waste on biohydrogen production. This research dealt with the production of biohydrogen in the continuous system. The reactor was equipped with circulation and operated anaerobically. The inoculum was taken from the sludge of the biogas installation in Gemah Ripah Fruit Market. Orange waste was used in three variations of organic loading rate (OLR) at 2.2, 2.5, and 3.1 L/day. The results revealed that the daily productions of gas for those OLR are about 15, 35, and 26 L/day respectively. Futhermore, for OLR of 2.5 L/day the total solid decreased from about 8 to 5%.]]>
<![CDATA[Pengaruh waktu dan konsentrasi NaOH pada proses delignifikasi wheat bran ]]>
<![CDATA[Devi Sepmita Wulansari]]>;
<![CDATA[Supranto Supranto]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 10 No 2 (2016): Volume 10, Number 2, 2016 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.33337
<![CDATA[There are approximately 14.5% of whole wheat which belongs to bran and contains cellulose (33.7-40%), hemicellulose (21-26%), lignin (11–22.9%) and the other components. Cellulose is polysaccharide which is composed of 2000-3000 unit of glucose. Cellulose purification from the wheat bran can be done by the hydrolysis, followed by the processes of delignification and bleaching. The experiments were perfomed first by hydrolizing 20 grams of wheat bran using 250 mL of 2.5 N HCl solution for 2 hours at temperature of 80oC. The next process was delignification using 400 mL of NaOH solution and was conducted by varying the time in 1 hour, 1,5 hours, 2 hours, and 2.5 hours and the concentration of NaOH solution in 0.5 N; 1 N; 1.5 N; 2 N. For the last process, bleaching was performed by using 300 mL of H2O2 10% solution in temperature of 80 oC for 1 hour. The sample was then dried in order to remove water content by getting the sample in the oven for 1 hour at temperature of 40 oC. The goals of the experiments were to find the correlation between the variation of time and NaOH concentration to the cellulose quality in terms of the color and the structure of cellulose sample and and to the quantitative measure which was the yield of the sample. The best product was obtained at the optimum operation of 2.5 hours delignification and 1.55 N of NaOH concentration.]]>
<![CDATA[Produksi organic preservative dan solid biofuel dari hydrothermal treatment tongkol jagung dengan variasi temperatur ]]>
<![CDATA[Haidar Ali]]>;
<![CDATA[Ahmad Tawfiequrrahman Yuliansyah]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 10 No 2 (2016): Volume 10, Number 2, 2016 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.33338
<![CDATA[Corn is one of staple food and influential commodity driving Indonesia’s economy. Indonesia currently produces as high as 19 million tons of corn which contains 50% of biomass in the form of cob. Waste from harvesting and consumption of corn, namely, corn cob (CC) is left as waste. This CC is actually a sustainable, easily accessible, and renewable biomass energy source as an alternative to Indonesia’s depleting fossil fuel reserves. Hydrothermal treatment is a conversion method that has some consequential advantages compared to other methods; e.g. the ability to treat high-moisture biomass like CC and the possibility to use lower temperature. This research aims to produce and characterize liquid and solid fuel subsequent to hydrothermal treatment of CC obtained from Sleman, Yogyakarta. After size reduction, fine particles were mixed with water to form slurry. Slurry was heated in an autoclave for hydrothermal treatment at initial pressure of 2.0 MPa and was held for 200 °C, 240 °C, and 270 °C in 30 minutes. The solid and liquid products were then separated. Liquid was analyzed using GC-MS and solid by using AAS. The result showed that, in comparison to raw material, solid product had higher carbon content which resulted in the increase of calorific value of the solid biofuel. The calorific value of solid product ranged from 19,59 -22,02 MJ/kg or 20,93-35,87% higher than raw materials and 4-17% higher than average coal used in Indonesia. Major component in liquid product are N, N-dimethyl formamide, furfural, and phenolic compound, with benzoic acid present as minor component. The potential of liquid products as organic preservatives are examined by testing the tenacity of wood against termite according to ASTM D3345-74 standard method. Result showed that liquid product were effective in exhibiting termiticidal activity and temperature 200 °C showed the optimum condition.]]>
<![CDATA[Pengaruh suhu pada esterifikasi amil alkohol dengan asam asetat menggunakan asam sulfat sebagai katalisator ]]>
<![CDATA[Muhammad Naufal Fakhry]]>;
<![CDATA[Suprihastuti Sri Rahayu]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 10 No 2 (2016): Volume 10, Number 2, 2016 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.33339
<![CDATA[Ester compounds are widely used as solvents, artificial aroma materials, and precursors of pharmaceutical ingredients. One of the ester compounds widely used in the chemical industry is amyl acetate. Amyl acetate can be synthesized by esterification of amyl alcohol and acetic acid, which is a liquid-liquid heterogeneous reaction. This study aims to study the kinetics of this particular reaction focusing on the effect of temperature. The catalyst used in this study was sulfuric acid. The mole ratio of acetic acid to amyl alcohol used was 2: 5. Reaction was run at constant temperature in a three-neck flask as a batch reactor. The acetic acid and sulfuric acid were first put into the reactor and heated while stirring. After reaching a certain temperature, the preheated amyl alcohol was added into the reactor. During reaction, the temperature was maintained at the desired temperature. The reactants and products involved in this reaction were immiscible. The product phases were separated and then the remaining acetic acid content in the water-soluble phase was analyzed by volumetric method. The study was carried out in 4 variations of temperature i.e. 70, 80, 90, and 100 oC. The results of experimental data analysis showed that the reaction will be faster when the temperature is higher. The mass transfer from the acetic acid phase to the amyl alcohol phase increased with the increase of temperature. The value of the reaction rate constant, the overall mass transfer coefficient, and the Henry’s constant were evaluated by the parameter fitting method using the MATLAB program. Based on the evaluation at the highest reaction temperature 100 oC, the rate constant was 0.0134 mL.mole-2s-1, the mass transfer coefficient was 0.3180 L s-1, and the Henry’s constant was 0.0174 (mole/L)A in phase II/(mole/L)A in phase I.]]>
<![CDATA[Komputasi dinamika fluida pada T–mikro mixer ]]>
<![CDATA[Putri Ramadhany]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 11 No 2 (2017): Volume 11, Number 2, 2017 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.26933
<![CDATA[Fluid diffusion can occur effectively if a high gradient concentration exists in every part of the fluid. This can be achieved by decreasing the cross section area of the channel into micro size. The miniatur size of micro mixer can be very effective for molecular diffusion in the mixing process. In this research, the modeling of mixing and heat transfer in the passive micro mixer was conducted. T-shaped mixer was chosen as micro mixer. Water was used as medium and passive tracers were added to differentiate water profile from two different inlets. Mixing and heat transfer profiles inside the T-micro mixer were observed. The computational fluid dynamics (CFD) modeling of mixing and heat transfer in the T-micro mixer was completed by ANSYS®. The effect of geometry and average input velocity of fluids on mixing process were observed. The result of this research included: (1) When the laminar flow is the dominant flow (Re is 25), the tracer mixing is not particularly seen. The tracer mixing is observed when the average velocity is increased (Re increases), (2) The heat flux to the wall (4.85x10-6 Watt/m2) occurred when T–micro mixer is no longer isothermal, (3) The scale–up to factor ten does not necessarily improve the mixing performance (Re is kept constant), and (4) When the shape of cross section is changed to circle (cross section area is kept constant), the mixing performance is not necessarily improved.]]>
<![CDATA[Pengaruh penambahan surfaktan sodium lignosulfonat (SLS) dalam proses pengendapan nano calcium silicate (NCS) dari geothermal brine ]]>
<![CDATA[M. Ridho Ulya]]>;
<![CDATA[Indra Perdana]]>;
<![CDATA[Panut Mulyono]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 11 No 2 (2017): Volume 11, Number 2, 2017 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.28245
<![CDATA[High concentration of dissolved silica in geothermal brine frequently causes operational problem in production of steam for electric generation. Mitigation of silica scaling is necessary to reduce the risk of steam production failure. In the present work, silicic acid in Dieng geothermal brine was reduced by introduction of calcium hydroxide that lead to formation of insoluble nano calcium silicates (NCS).The purpose of this work was to control size of the precipitated NCS by introducing surfactant sodium lignosulfonate (SLS) as surfactant in the Ca(OH)2 added geothermal brine. The effect of temperature (30, 50 and 70°C), pH (7, 8 and 9), and surfactant concentration (0.05, 0.15 and 0.30% (w/v)) on the particle size of the resulting NCS was studied to obtain the optimum operating condition. The precipitation-sedimentation behavior of the resulting particles was measured in a vertical tube. Having measured the solid density and solution density and viscosity, average diameter of the precipitated particles was determined using stoke’s principle. The calculated particle size was the compared with measurement result using particle size analyzer (PSA). The soluble silica concentration in the solution was measured using spectroscopy method while composition of the resulting solid particles was measured using EDX and FTIR. Experimental results showed that the dissolve silica in Dieng geothermal brine can be reduced and controlled with the addition of Ca(OH)2 and surfactant SLS. The greater the concentration of surfactant SLS, the smaller the resulting particle size. It was found that the formation of NCS particles was accompanied with precipitation of silica and salts. The optimum condition of NCS formation was at temperature 30°C and pH 9 while the concentration of surfactant SLS added to the brine was 0.3 % (w/v).]]>
<![CDATA[Evaluasi nilai difusivitas ion kalsium dan magnesium pada proses low salinity waterflood di batuan Berea ]]>
<![CDATA[Yusardhany Yusuf]]>;
<![CDATA[Suryo Purwono]]>;
<![CDATA[Sang Kompiang Wirawan]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 11 No 2 (2017): Volume 11, Number 2, 2017 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.22146/jrekpros.28890
<![CDATA[In recent years Low Salinity Waterflood (LSW) had been supposed as trusty method to improve oil recovery and the most essential aspect is a alteration of divalent ion concentration in reservoir pore volume as a respon LSW. The objective of this paper are to find divalent diffusivity constant (Ca2+ and Mg2+) in berea sandstone by ionsmass conservation equation along with Atomic Absorption Spectroscopy (AAS) as validation. The study was conducted at 2 berea core having porosity : 0.235 and 0.230 and permeability : 661 mD and 550 mD, we use synthetic formation water accordance to "LN" field property. Experiment was treated by by diluting Ca2+ up to 79% from its original value and by diluting Mg2+ up to 95% from its original value while other ion were maintained fit to their original value. As a result we got difusion constant 0.0620 cm2.min-1 and 0.2667 cm2.min-1for Ca2+ and Mg2+, respectively.]]>
