Reaktor最新文献

{"title":"Design of Propellant Composite Thermodynamic Properties Using Rocket Propulsion Analysis (RPA) Software","authors":"A. Pinalia, Bayu Prianto, Henny Setyaningsih, Prawita Dhewi, R. Ratnawati","doi":"10.14710/reaktor.22.1.1-6","DOIUrl":"https://doi.org/10.14710/reaktor.22.1.1-6","url":null,"abstract":"Rocket Propulsion Analysis (RPA) is software for predicting the performance of a rocket engine. It is usually used in conceptual and preliminary design. Heat capacity and specific impulse are two properties related to the performance of a propellant. This work aimed to design AP/HTPB-based solid propellant composite with various compositions and predict the heat capacity and specific impulse using the RPA software. The materials used were ammonium perchlorate (AP) as the oxidizer, Hydroxy-Terminated Polybutadiene (HTPB) as the fuel binder, Al powder as the metal fuel, and other additives. Four propellants with different formulations were prepared and tested for heat capacity and specific impulse. The experimental heat capacity was obtained using a differential scanning calorimeter (DSC), while the specific impulse was obtained using a bomb calorimeter. The same propellant formulations were used as the input to the RPS to predict the heat capacity and specific impulse. The results show that the experimental heat capacity of the propellant ranges from 1.576 to 4.08 J g–1 K–1, and the simulation result ranges from 1.78 to 3.48 J g–1 K–1. The overall average deviation is 16.3%. The predicted specific impulse at vacuum and sea level ranges from 231.3 to 234.0 s and from 219.8 to 220.9 s, respectively. Meanwhile, the experimental specific impulse at vacuum and sea level varies from 236.2 to 240.3 s and from 228.5 to 232.9 s, respectively. The overall average deviation is 3.7%. Therefore, the RPA is reliable for predicting specific impulse of propellant, but it is not accurate enough for predicting the heat capacity of propellant composite.","PeriodicalId":20874,"journal":{"name":"Reaktor","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72764216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effect of Flowrate on Dye Removal of Jumputan Wastewater in a Fixed-Bed Column by Using Adsorption Model: Experimental and Breakthrough Curves Analysis","authors":"L. Cundari, B. D. Afrah, A. Jannah, Patrick Rudy Meizakh, Muhammad Alik Aziz, Wulan Ayum Larasati","doi":"10.14710/reaktor.22.1.28-35","DOIUrl":"https://doi.org/10.14710/reaktor.22.1.28-35","url":null,"abstract":"One of the traditional arts in Indonesia is Jumputan fabric which produced by using tie and dye technic. The Jumputan wastewater contains organic compounds which can decrease the oxygen content in water. An economic and applicable process to handle the Jumputan wastewater is adsorption. The research was conducted to find out the effect of flowrate to the adsorption performance of the dye onto activated carbon in a continuous fixed-bed column based on the breakthrough curve parameter. The activated carbon made from betel nuts (Cyrtostachys lakka) with size particle of 60 mesh. The column dimension was 2 inches of inside diameter and 60 cm of height column. The bed height was 10 cm. The feed pumped from the top of column with variation of flowrate of 10, 20 and 30 ml/min. The absorbance of the dye was analyzed by using UV-Vis spectrophotometer. The adsorption column models were analyzed using Thomas, Yoon-Nelson, and Adam-Bohart. The result of this research was the dye removal efficiency decreased with the increase in flowrate, which was 61.4%; 56.9%; and 47.6% for 10, 20, and 30 ml/min respectively. Feed flowrate showed a negative effect on the saturation time, the higher the flowrate, the faster it reaches the saturation point of the adsorbent. The breakpoints were 180, 260, and 420 minutes at 30, 20, 10 ml/min flowrate. The model data indicated that Thomas and Yoon-Nelson are fitted well with the experimental results. The models show the largest regression and the smallest error with the value of each 0.99 and 0.0035 at flowrate of 10 ml/min.","PeriodicalId":20874,"journal":{"name":"Reaktor","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77504273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"One-phase Transesterification of Palm Oil in to Biodiesel with Co-solvent Methyl Esters: The Effect of Adding Co-solvent to Kinetic Energy and Dipole Moment","authors":"E. Daryono, L. Mustiadi","doi":"10.14710/reaktor.22.1.7-13","DOIUrl":"https://doi.org/10.14710/reaktor.22.1.7-13","url":null,"abstract":"In the transesterification process, the problem is the low solubility of oil in methanol, so the reaction will run slowly. The solution to this problem is to add a co-solvent to increase the solubility so that a one-phase reaction will be formed. The co-solvent methyl ester is the right choice because it is a product of the reaction itself so that it does not require a separation process. The operating conditions of the study were mass of palm oil 250 g, mass of NaOH catalyst 0.8%wt, stirring speed 100 rpm, reaction temperature 60oC, the molar ratio of oil:methanol = 1:6, reaction time (5,10,15,20,25,30 minutes), and the mass of co-solvent (0,5,10,15%wt). The first stage of the research was to make co-solvent, then proceed with the transesterification reaction by adding  co-solvent which was carried out according to the research operating conditions. The optimum condition of the study was obtained at reaction time 30 minutes and the addition of co-solvent 5%, with yield 97.4171%. The density of FAME 0.88 g/mL and the concentration of FAME 99.963% which complied with SNI 7185-2015. The simulation results of ChemDraw for components of triglyceride+methanol+NaOH+co-solvent obtained kinetic energy 3479.0264 kJ/mol and dipole moment 43279.8007 debyes.","PeriodicalId":20874,"journal":{"name":"Reaktor","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88506074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Production of Activated Carbon from High-Grade Bituminous Coal to Removal Cr (VI)","authors":"E. Kusdarini, Denis Rocky Pradana, A. Budianto","doi":"10.14710/reaktor.22.1.14-20","DOIUrl":"https://doi.org/10.14710/reaktor.22.1.14-20","url":null,"abstract":"Activated carbon was produced from high-grade bituminous coal, potentially removing Cr metal in textile industrial waste. The purposes of this study were 1) getting activated carbon characteristics, 2) studying the impact of reagent concentration and activation temperature on the activated carbon characteristics, and 3) getting the isotherm adsorption equation for activated carbon developed by Freundlich and Langmuir on Cr metal. This research used an experimental method with a laboratory scale, which means the manufacture of activated carbon and a test of adsorbs power of activated carbon to the Cr metal were conducted in the laboratory. Activated carbon manufacture through carbonization process of chemical activation used reagent (NH4)3PO4, neutralization, filtration, physical activation, and cooling. At the same time, it tested the adsorption power of the activated carbon to Cr metal through activated carbon contact with a solution containing some Cr6+ ion. The update in this research was using reagent (NH4)3PO4 and the test of adsorption power of activated carbon to Cr6+ ion contained in the artificial waste. This research showed activated carbon that has been activated using reagent (NH4)3PO4 0.5 – 2 M at physical activation temperature of 825oC and has met the standard of SNI number 06-3730-1995. The best-activated carbon was produced from chemical activation using (NH4)3PO4 1 M solution and physical activation at 825oC. The best-activated carbon characteristics contained 1.27% water; 17.17% content of volatile matter, 9.39% was ash content; 73.17% contained fixed carbon, and the iodine value was 1248.30 mg/g. The best Equation of Langmuir isotherm adsorption of activated carbon to the Cr6+ produced Constant Ar = -90.0901 and Kc = -0.0075.","PeriodicalId":20874,"journal":{"name":"Reaktor","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72626219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cracking of Methyl Ester from Used-Cooking Oil Using Ni-Impregnated Active Charcoal Catalyst","authors":"N. Nazarudin, U. Ulyarti, O. Alfernando, Yogie Yogendra Hans","doi":"10.14710/reaktor.22.1.21-27","DOIUrl":"https://doi.org/10.14710/reaktor.22.1.21-27","url":null,"abstract":"Current petroleum energy sources have been starting to diminish along with the increasing a demand in industries and transportations. In the next few years Indonesia is predicted to experience a fuel crisis. One way to solve this problem is to find the alternative energy sources from renewable raw materials. This study was conducted to obtain alternative renewable energy sources through catalytic cracking of used cooking oil-derived methyl ester into biofuel using active charcoal catalyst.  The active charcoal was made out of solid waste (shells) of the oil palm industry. Nickel solutions of varying concentrations (1%, 2%, 3%) ware impregnated into active charcoal to produce the Ni- charcoal catalyst. This catalyst was then used for catalytic cracking of methyl esters with variations in the reaction temperature of 400oC, 450oC and 500oC. The Methyl ester was produced from filtered used-cooking oil by transesterification method. SEM-EDX analysis showed that Nickel metal was successfully embedded into active charcoal where the highest concentration of Nickel (18.4%) was found at a impregnation treatment using 2% of Nickel solution. From the SEM image, it can also be seen that the catalyst produced unique pores. The gravimetric analysis of the catalytic cracking product showed that the highest fraction of oil liquid resulting from catalytic cracking at 400oC using Ni-charcoal catalyst impregnated with 3% Nickel solution.","PeriodicalId":20874,"journal":{"name":"Reaktor","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76446154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fouling Analysis on Polysulfone/Peg400/ZnO Membrane during Textile Wastewater Treatment","authors":"P. Aryanti, Febrianto Adi Nugroho, Gatra Buana Winiarti, Ghina Shofi Pratiwi, I. N. Widiasa","doi":"10.14710/reaktor.1.1.139-145","DOIUrl":"https://doi.org/10.14710/reaktor.1.1.139-145","url":null,"abstract":"Fouling has become the main problem in long-term application of ultrafiltration (UF) membrane for water and wastewater treatment, significantly reducing membrane productivity. In this paper, fouling on polysulfone-based membrane was analyzed using Hermia’s model during textile wastewater treatment. The UF membrane has been prepared by blending polysulfone (PSf), acetone, and PEG400 in DMAc, with ZnO nanoparticles at a concentration of 1% by weight of polymers (PSf and PEG400). The influence of polysulfone concentration (18 and 20 wt.%) and PEG400 (0 - 25 wt.%) on fouling mechanisms was investigated. It was found that the increase of polysulfone from 18 to 20 wt.% reduced permeate flux from 54 to 25 L.m-2.h-1. Vise versa, the increase of PEG400 concentration enhanced the permeate flux. More stable flux was achieved when 18 wt.% of polysulfone was used to prepare the UF membrane. The fouling type in the UF membrane depends on the characteristics of the membrane. A significant flux decline occurred when used 20 wt.% of polysulfone without the addition of PEG400. Smaller membrane pore and higher hydrophobicity due to high polysulfone concentration induced cake layer of fouling on the membrane surface at the first 40 minutes of ultrafiltration. Further increase of operating time, internal fouling was formed due to the movement of pollutants to the permeate side caused by different concentrations. The highest color rejection (86%) was achieved when 25 wt.% of PEG400 was added in 20 wt.% of polysulfone solution.Keywords: fouling, hermia model, ultrafiltration, wastewater treatment.","PeriodicalId":20874,"journal":{"name":"Reaktor","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79949263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic and Steady Model Development of Two-Chamber Batch Microbial Fuel Cell (MFC)","authors":"A. Harimawan","doi":"10.14710/reaktor.1.1.160-169","DOIUrl":"https://doi.org/10.14710/reaktor.1.1.160-169","url":null,"abstract":"As an alternative source of renewable energy that has piqued researchers’ interest, Microbial Fuel Cell’s (MFC) limitation of low power density requires further development. Various factors affect the performance, but performing all will be costly and time-consuming. Through a combination of dynamic and steady-state mathematical model modified from past research, effect of microbe types towards dynamic biofilm formation and stead-state OCV can be observed, followed by steady-state simulation to determine maximum power density and its’ corresponding voltage. Similarity with previous research has been observed, with maximum OCV of 838.93 mV achieved by heterotrophic biomass in 75-100 hours with biofilm thickness of 2.087 x 10-4 m, while generating maximum power density of 2050.12 mW//m2 and voltage of 408.16 mV. Lowest OCV value of 838.76 mV was observed in C. sporogenes in 450-475 hours with a biofilm thickness of 2.079 x 10-4 m, while the lowest value of maximum power density was observed in anaerobic microbial communities at 8.48 mW/m2 with voltage of 90.43 mV. Furthermore, it has been observed that variations with higher  and lower  results in higher stead-state OCV in the shortest amount of time, while increasing power density and its’ corresponding voltage. @font-face {font-family:\"Cambria Math\"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:0; mso-generic-font-family:roman; mso-font-pitch:variable; mso-font-signature:-536869121 1107305727 33554432 0 415 0;}@font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4; mso-font-charset:0; mso-generic-font-family:swiss; mso-font-pitch:variable; mso-font-signature:-469750017 -1073732485 9 0 511 0;}p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-unhide:no; mso-style-qformat:yes; mso-style-parent:\"\"; margin:0cm; mso-pagination:widow-orphan; font-size:12.0pt; font-family:\"Times New Roman\",serif; mso-fareast-font-family:\"Times New Roman\"; mso-ansi-language:EN-US;}.MsoChpDefault {mso-style-type:export-only; mso-default-props:yes; font-size:10.0pt; mso-ansi-font-size:10.0pt; mso-bidi-font-size:10.0pt; font-family:\"Calibri\",sans-serif; mso-ascii-font-family:Calibri; mso-fareast-font-family:Calibri; mso-hansi-font-family:Calibri; mso-ansi-language:IN; mso-fareast-language:IN;}div.WordSection1 {page:WordSection1;}","PeriodicalId":20874,"journal":{"name":"Reaktor","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87315733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Valorisation of Shrimp Waste into Chitosan/Montmorillonite-Sulfosuccinic Acid Composite Membrane for DMFC Application","authors":"Shalahudin Nur Ayyubi, L. Atmaja, A. Purbasari","doi":"10.14710/reaktor.1.1.146-154","DOIUrl":"https://doi.org/10.14710/reaktor.1.1.146-154","url":null,"abstract":"Composite membranes have been synthesized from biopolymer chitosan (CS) and nanosized montmorillonite (MMT) filler crosslinked with sulfosuccinic acid (SSA) as an alternative membrane electrolyte for direct methanol fuel cell (DMFC) application. All prepared membranes were obtained by solution casting technique. Prepared membranes were systematically characterized in terms of water uptake, methanol uptake, and methanol permeability as membrane performance parameter for DMFC applications. Fourier transform infrared spectroscopy was used to confirm the structures of the CS/MMT-SSA composite electrolyte membranes. The addition of sulfosuccinic acid evidently decreased the value of methanol permeability with the lowest value of 2.9973 × 10-7 cm2/s was obtained from CS/MMT-SSA 16% membrane. The addition of sulfosuccinic acid also decreased the absorption of methanol with the lowest value of 45.9459% while the water absorption of 53.6424% occurred in the membrane with the addition of 16% sulfosuccinic acid. As a result, the CS/MMT-SSA composite membrane appears to be a potential candidate for the DMFC applications.Keywords: direct methanol fuel cell; proton exchange membrane; methanol permeability; chitosan","PeriodicalId":20874,"journal":{"name":"Reaktor","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82803347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characteristic of Kimpul (Xanthosoma sagittifolium) Flour Modified with Hydrogen Rich Water","authors":"G. Budiarti, E. Sulistiawati, Nurani Sofiana, Dessy Norma Yunita","doi":"10.14710/reaktor.1.1.155-159","DOIUrl":"https://doi.org/10.14710/reaktor.1.1.155-159","url":null,"abstract":"Kimpul one of tuber that potentially for substitute wheat in Indonesia. The disadvantage of kimpul tubers is that they are easily damaged or not durable because they have a high moisture content. Either method to modify starch is to use hydrogen rich water. The advantages of HRW compared to other modification methods are that HRW is safer, healthier for the body and more economical. The objective of the work was to determine the effect of hydrogen rich water and drying temperature on characteristic kimpul flour. Variables were used in this research pH (3, 6,7,9,11), soaking time (15, 30, 45, 60, and 75 minutes), temperature drying (100,110,120°C). The result is yield maximum obtained 38.67% at pH 7, soaking time 45 minutes and temperature drying 100°C. Swelling power is 0.52%. Structure molecule spherical and, separated. Result of proximate analysis for modified kimpul flour are ash content 4.49%; fat content 0.27%; fiber 4.69%; carbohydrate content 76.25%; protein 4.15%; moisture content 10.14%, energy 313.76 Kal/100 g; reducing sugar 0.78%. Color analysis result L, a and b are 19.63; 1.78 and 9.23 respectively. Hydrogen rich water has a good effect on molecules and color.Keywords: flour, kimpul, hydrogen rich water","PeriodicalId":20874,"journal":{"name":"Reaktor","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90313031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reduction of Fe Using Advanced Oxidation Processes (AOPs) and Electromagnetic Water Treatment (EWT)","authors":"V. Luvita, N. A. Mahardiono, Hanif Fakhrurroja, A. Waskito","doi":"10.14710/reaktor.1.1.133-138","DOIUrl":"https://doi.org/10.14710/reaktor.1.1.133-138","url":null,"abstract":"The processing on water treatment in this research is carried out by using two combination methods of Advanced Oxidation Processes (AOPs) and Electromagnetic Water Treatment (EWT). The application of AOPs method is one of alternative to remove heavy metals while the application of EWT method is to improve water quality and to prevent the using of expensive chemicals or corrosive substances. The using of chemicals can cause new problems that endanger human health or damage the environment. This paper presents the advantage of the combining these methods is the high ability to process contaminated water into clean water. AOPs and EWT system configuration is needed to determine the effectiveness of the processing system, especially in removing heavy metal minerals such as iron (Fe). Based on the efficiency result, the configuration by using AOPs + EWT reduces the iron (Fe) mineral content by 99,33% and increases the pH value by 6.09.Keywords: water; treatment; substances; metal; mineral","PeriodicalId":20874,"journal":{"name":"Reaktor","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88834161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}