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[Pemanfaatan LNG sebagai sumber energi di Indonesia ]]>
<![CDATA[Nurhadi Budi Santoso]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 8 No 1 (2014): Volume 8, Number 1, 2014 ]]>
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DOI: 10.22146/jrekpros.5021
<![CDATA[The need of energy supplies in Indonesia, especially on diesel demand is increasing every year. However, this increase could not be fulfilled by national oil based energy supply due to the decrease of oil production and there has not been significant increase in term of oil fractionation plants. As a consequence, diesel import could not be avoided resulting an additional burden in nation budgeting. In order to solve this problem, LNG might be an alternative. Thus, diesel import can be eliminated; furthermore, domestic industries can be more competitive. Although Indonesia is one of the major LNG producers, most of the LNG production is exported to Japan, Korea, and China, but LNG has not been utilized by the society as well as domestic industries. A massive socialization of the utilization of LNG to replace diesel energy should be conducted. Moreover, facilities and infrastructures including transportation, storages, and converter kits have to be built to support this conversion process. Based on the cost saving analysis, the use of dual fuel (diesel and LNG) in a machine could possibly save 20-25% in comparison to that machine using single fuel (diesel).]]>
<![CDATA[Dekolorisasi dan deoilisasi parafin menggunakan adsorben zeolit, arang aktif dan produk pirolisis batu bara ]]>
<![CDATA[Bardi Murachman]]>;
<![CDATA[Eddie Sandjaya Putra]]>;
<![CDATA[Wulandary Wulandary]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 8 No 2 (2014): Volume 8, Number 2, 2014 ]]>
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DOI: 10.22146/jrekpros.11371
<![CDATA[Indonesian wax production was reaching 50277 barrels in 2009. Although the wax production rate in Indonesia is quite high, it is still not enough to fulfill the demand. Therefore, Indonesia has to import wax from China. Unfortunately, Indonesian wax qualities, especially related to colour and hardness, are less compared with those from China. Local wax is more brownish yellow, soft and easily melted compared with the wax from China which is whiter, harder and difficult to melt.Many research activities have been conducted to improve quality of local wax. Among of them is with the use of adsorption method with adsorbent.Various adsorbents can be used, including activated carbon, zeolite, and coal pyrolysis product. The present work aim was to find the ability of forementioned adsorbent in purpose to improve the quality of wax, i.e. colour and texture, by decolorization dan deoilization process. Adsorbent was added to the wax at 90°C and mixing was then conducted. Parameters under investigation were the influence of the ratio of wax to adsorbent and the optimum mixing time.Based on reduction of oil content and colour intensity, the best wax -adsorbent ratio was 6 : 6 with a mixing time of 50 minutes. Zeolite gives the best adsorption properties and high effectivity in deoilization and decolorization process.]]>
<![CDATA[Suhu dan rasio kukus optimum pada proses gasifikasi kukus berkatalis K2CO3 terhadap arang batu bara lignit hasil pirolisis dengan laju pemanasan terkontrol ]]>
<![CDATA[Dewi Tristantini]]>;
<![CDATA[Ricky Kristanda Suwignjo]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 8 No 2 (2014): Volume 8, Number 2, 2014 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
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DOI: 10.22146/jrekpros.11372
<![CDATA[In order to fulfill the raw material needs of Fischer Tropsch process for producing synthethic fuel (synfuel), high yield of synthesis gas (syngas) with H2/CO ratio ≈ 2.0 should be obtained from lignite coal gasification. Steam gasification can enhance H2 composition in syngas. Lower activation energy of gasification reaction can be obtained using K2CO3 catalyst during the process. Pyrolysis step with controlled heating rate will affect pore surface area of char which will influence the composition and yield of syngas. In this study, lignite char from pyrolysis with controlled heating rate with 172.5 m2/g surface area and K2CO3 catalyst was fed in fixed bed steam gasification reactor. Steam to char mass ratio (2.0; 3.0; 4.0) and gasification temperature (675; 750; 825°C) was varied. Optimum condition for syngas production obtained in this study was steam gasification at 675°C with steam/char mass ratio 2.0. This condition will produce syngas with H2/CO ratio 2.07 and gas yield 1.128 mole/mole C (45% carbon conversion).]]>
<![CDATA[Synthesis of oligoesters plastic film from polylactic acid with mono ester plasticizer of wood flour and rice bran and its hydro degradation ]]>
<![CDATA[Edwin Azwar]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 8 No 2 (2014): Volume 8, Number 2, 2014 ]]>
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DOI: 10.22146/jrekpros.11373
<![CDATA[Composites of polylactic acid (PLA) with mono ester plasticizer (MEP) from wood flour and rice bran were prepared to evaluate the effect of MEP filler content on the mechanical, functional, thermal, and morphological properties of the composites and its degradation. The SEM study provided evidence that there was sufficient interfacial adhesion between the PLA matrix and the MEP from wood flour and rice bran filler. This was likely a result of mechanical interlocking among them. An addition of 10 and 30% MEP from wood flour or rice bran resulted in an improvement of strain and tensile properties of the composite. The composites of PLA and MEP from wood flour and rice bran experienced degradation through hydrolysis of regions that have crystalline structure.]]>
<![CDATA[Sintesis ZSM-5 dari coal fly ash (CFA) dengan sumber silika penambah yang berasal dari abu sekam padi: pengaruh rasio SiO2/Al2O3 terhadap kristalinitas produk ]]>
<![CDATA[Azlia Metta]]>;
<![CDATA[Simparmin Br Ginting]]>;
<![CDATA[Hens Saputra]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 8 No 2 (2014): Volume 8, Number 2, 2014 ]]>
Publisher : <![CDATA[Jurnal Rekayasa Proses ]]>
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DOI: 10.22146/jrekpros.11374
<![CDATA[Coal Fly Ash and rice husk ash can be utilized by converting it into ZSM-5 synthetic zeolite. One of the influencing factors of ZSM-5 synthetis is ratio of SiO2/Al2O3. Synthesis of ZSM-5 was carried out in an autoclave at a temperature of 180°C with a variation of the ratio of SiO2/Al2O3, namely 20, 30, 40, 50 and 60 mol/mol during 24 hour crystallization using TPABr template. Characterization of ZSM-5 was conducted using X-ray Diffraction, Scanning Electron Microscopy, Adsorption-Desorption Analysis of Nitrogen and Acidity. The results showed that the ZSM-5 was formed in all the variations of SiO2/Al2O3 ratios with the highest percent crystallinity of 52.83%, at the ratio of 50 mol/mol. All products are still in accompany with the formation of side products such as Analsime and Silica Oxide. The ZSM-5 crystal product was in hexagonal shape. Results from Adsorption-Desorption Analysis of Nitrogen indicated that all products were mesoporous materials.]]>
<![CDATA[Pembuatan kitosan dari kulit dan kepala udang laut perairan kupang sebagai pengawet ikan teri segar ]]>
<![CDATA[Mamiek Mardyaningsih]]>;
<![CDATA[Aloysius Leki]]>;
<![CDATA[Oktovianus D. Rerung]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 8 No 2 (2014): Volume 8, Number 2, 2014 ]]>
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DOI: 10.22146/jrekpros.11375
<![CDATA[The objective of the study is to examine the feasibility of chitosan from skin and head of the shrimp from Kupang seas as a fresh anchovy preservative. The study was conducted through two stages: chitosan production and application of chitosan as fresh anchovy preservative. Chitosan production generally starts from shrimp waste flour manufacture, deproteinization, demineralization and deacetilation. The concentration of chitosan as fresh anchovy preservative is 1.5%. Chitosan characterization includes water, protein, ash and fat and fresh anchovy test which covers the organoleptic test, microbiology and proximate test. The results showed that chitosan has flake shape with moisture content of 2.81%, ash 0.75%, nitrogen 7.26%, clear transparent color and 79.11% degree of deacetilation. Characteristics of chitosan meet Proptan Laboratoris standards. Storage life of fresh anchovy soaked in chitosan is 3 days at room temperature storage, while for normal fresh anchovy is only 1 day. Chitosan can extend the storage life, increase the rate of protein fish, preserve the taste of fresh anchovy and make the fresh anchovy more shinny.]]>
<![CDATA[Pengaruh detoksifikasi dan konsentrasi substrat terhadap produksi biohidrogen dari hirolisat ampas tahu ]]>
<![CDATA[Amir Husin]]>;
<![CDATA[Sarto Sarto]]>;
<![CDATA[Siti Syamsiah]]>;
<![CDATA[Imam Prasetyo]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 8 No 2 (2014): Volume 8, Number 2, 2014 ]]>
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DOI: 10.22146/jrekpros.11376
<![CDATA[The effect of detoxification and substrate concentration on fermentative hydrogen production by mixed cultures was investigated in batch experiments using tofu solid waste (TSW) hydrolysate as substrate. TSW as the by product of tofu processing industry was hydrolyzed using diluted hydrochloric acids as catalyst (0.5% wt HCl, 104°C and 30 minutes). After neutralized by Ca(OH)2 (aq) and then treated by activated carbon for one hour, the hydrolysate was used for biohydrogen production. The experimental results show that, during fermentative hydrogen production under mesophilic condition and initial pH 6.5 were influenced both substrates without/with detoxification. The maximal hydrogen yield of 4.9 mmol/g reducing sugar (RS) were obtained at detoxified substrate consentration of 2 g GT/L. Detoxification has also shown to shortened lag phase of fermentation (l). Adaptation time of microbes during fermentation was reduced from 20 into 13.25 hours for fermentation without/with detoxification respectively at initial substrate concentration of 2 g GT/L.]]>
<![CDATA[Pemodelan dinamika awal adsorpsi Na2S dalam kolom bahan isian biji salak (Salacca zalacca) ]]>
<![CDATA[Irma Atika Sari]]>;
<![CDATA[Muhammad Mufti Azis]]>;
<![CDATA[Siti Syamsiah]]>;
<![CDATA[Sutijan Sutijan]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 9 No 1 (2015): Volume 9, Number 1, 2015 ]]>
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DOI: 10.22146/jrekpros.24523
<![CDATA[Biofiltration is a promising method for gas purification due to its efficiency and low operating cost. One way to utilize biofiltration is in biogas purification where H2S is removed from the biogas product. The presence of H2S may cause severe corrosion in biogas processing facilities. By the use of biofilter, H2S is dissolved and adsorbed on packing material. This study investigated the adsorption process that occured during the beginning of biofilter operation. Na2S has been used as a model compound for H2S with packing material from snake fruit seeds. In this study, we have investigated the influence of liquid flowrate and inlet concentration of Na2S solutions. Na2S solution was fed from the top part of the column and trickled down through the snake fruit seed bed. The dissolved sulfide left the column from the bottom part which was then collected in a sample bottle and analized periodically with UV-VIS spectrophotometer. A one dimensional mathematical model of the adsorption column with respect to z direction was proposed to describe the adsorption behavior. In addition, Freundlich isotherm was used to describe the solid-liquid adsorption equilibrium. The experimental results showed that low flowrates i.e. 1.59 and 2.97 mL/s gave larger adsorption capacities than higher flowrate i.e. 3.96 and 5.58 mL/s. In addition, the influence of inlet concentrations to the breakthrough characteristics were found to be negligible. The fitting results estimated the values of DL=1.3174.10-7 m2/s, α=1.002.10-4 and n=12.661. As a result, it could be concluded that the axial diffusion had small influence on the adsorption of Na2S solution. In addition, the small value of α as well as large value of n indicated that the adsorption capacity of snake fruit seeds was relatively small.]]>
<![CDATA[Karakterisasi larutan polimer KYPAM HPAM untuk bahan injeksi dalam enhanced oil recovery (EOR) ]]>
<![CDATA[Harimurti Wicaksono]]>;
<![CDATA[Sutijan Sutijan]]>;
<![CDATA[Ahmad Tawfiequrrahman Yuliansyah]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 9 No 1 (2015): Volume 9, Number 1, 2015 ]]>
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DOI: 10.22146/jrekpros.24524
<![CDATA[Polymer injection is one method of Enhanced Oil Recovery (EOR), where the polymer is dissolved in water, usually the formation water. Hydrolyzed polyacrylamide (HPAM) polymer types are most commonly used. This study aims to investigate the effect of KYPAM HPAM polymer concentration and operating conditions upon the water injection in order to determine the optimal injection system. Viscosity of polyacrylamide solution was measured with a Brookfield viscometer. Variation in salinity is carried out by mixing formation water with distilled water, whereas for high salinity of formation water using evaporation method. Shear rate was varied in the range of 1-45 s-1, while solution temperature was varied in the range of 70 - 87°C , and the effect of H2S gas in the solution was conducted by saturating the solution using natural gas which has concentration of H2S as 100 ppm.The results show that the effect of salinity solution has the greatest influence on the decrease in viscosity of the solution when compared to the other factors. Decrease in viscosity was due to agglomeration process resulting precipitate of polyacrylamide in the form of vaterite and aragonite morphology. The result also show that an increase in shear rate resulting lower viscosity. The increase in temperature causes the viscosity of the solution decreases. Meanwhile, the presence of H2S in the solution reduces the viscosity of the solution due to chemical degradation.]]>
<![CDATA[Optimasi dan pemodelan matematis deasetilasi kitin menjadi kitosan menggunakan KOH ]]>
<![CDATA[Edwin Rizki Safitra]]>;
<![CDATA[Budhijanto Budhijanto]]>;
<![CDATA[Rochmadi Rochmadi]]>
<![CDATA[ Jurnal Rekayasa Proses Vol 9 No 1 (2015): Volume 9, Number 1, 2015 ]]>
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DOI: 10.22146/jrekpros.24525
<![CDATA[Chitosan is valuable product that can be produced from crustacean shell wastes. Chitosan is important ingredient in various fields, for example food industry, biotechnology, pharmacy, medicine, and environment. The objective of this experiment was to obtain optimum conditions of chitin deacetylation process and to propose mathematical model of deacetylation reaction to be used in reactor design. This experiment used KOH solution at various concentration of 40 to 70% (weight fraction), temperature of 80 to 120oC, and reaction time of 4-6 hours. The results showed that optimum condition was achieved at the concentration of KOH of 60%, temperature of 100oC, and reaction time of 5.5 hours. At that condition, the degree of deacetylation (DD) of the chitosan produced was 80.79%, which well met the market standard of 80% DD. The mathematical model proposed in this study indicated that diffusion controlled the the overall rate of reaction.]]>
