Seminar Nasional Teknik Kimia Kejuangan
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Pengaruh Variasi Kosentrasi Tepung Tapioka Termodifikasi Dengan Metode Enzimatis Sebagai Bahan Substitusi Pada Proses Pembuatan Mie
Full text linkIndonesia has dependency to rice Enough high , so request rice very tall And when happen scarcity rice inside _ country . So needed innovation product For cope problem such , ie Wrong only one replace rice with noodles wet as alternative replacement source carbohydrates . Material raw making noodles wet on study This is flour tapioca modified And flour wheat as material substitution . Expected with use material non- flour basis For product noodles capable replace dependency use flour flour . On study This use variation comparison composition flour tapioca modified And flour different flour _ namely ; (10%:90%, 25 % : 75%, and 30%:70%) use variation concentration enzyme 10%, 20%, 30%, 40%, and 0% as control parameters . Results study show comparison flour tapioca modified influential to noodle water content wet And quality noodles wet include (aroma, elasticity , and color ). Highest water content that is sample noodles wet on ratio of 30% flour tapioca modified and 70% flour wheat with 40% enzyme concentration of 64.54 % . According to Body Standard Indonesian National requirements quality noodle water content good wet is 65%, got concluded that noodles wet fulfil requirements
Pengaruh Waktu Pemasakan dan Konsentrasi NaOH Terhadap Penurunan Kadar Lignin Pulp dari Batang Pisang Kepok dengan Proses Soda
Full text linkBanana is a plant that has very high cellulose content so it can be used as a raw material for making pulp. This research was conducted with the aim of knowing the effect of cooking time and sodium hydroxide concentration on reducing the lignin content of banana stem pulp by soda process. The cooking solution used in the soda process is NaOH solution. With various concentrations of NaOH 20%, 25%, and 30% and cooking time 40, 80, and 120 minutes. The highest lignin content was 1.8785% during pulping for 40 minutes with 20% NaOH concentration. While the lowest lignin content was 1.3093% during pulping for 120 minutes with 30% NaOH concentration
Sintesis dan Karakterisasi Nano-Hidroksiapatit dari Cangkang Rajungan Sebagai Material Pembuatan Filament 3D Printing dengan Kombinasi Poly(caprolactone)
Full text linkAn orthopedic anchoring rotator cuff is often used to reattach a torn rotator cuff tendon to the bone. However, anchoring rotator cuffs commonly use non-biodegradable metals and require a second surgery. Furthermore, manufacturing processes for retaining rotator cuff implants are developed using filament-based 3D printing. So that biodegradable and biocompatible materials are needed as filament materials for making anchoring rotator cuffs, one of which is by mixing poly(caprolactone) (PCL) and hydroxyapatite (HAp). In this research, we will synthesize nano-sized HAp from crab shell waste using the precipitation method. The synthesis results will be reviewed through XRF, FTIR, XRD, and SEM analysis. In addition, the mechanical properties of PCL/HAp composite filaments for tissue scaffolds at variables of 9.5:0.5, 9:1, and 8.5:1.5 were also reviewed. XRF characterization results show that the crab shell has a calcium content of 93.09%. FTIR testing shows the formation of hydroxyapatite functional groups, namely OH- and PO43. XRD test results show conformity with the JCPDS 09-0432 graph with a degree of crystallinity of 88.32%. SEM analysis showed that the HAp produced has a nano size with a particle diameter of about 126.3 nm. In mechanical analysis, the best PCL/HAp filaments were obtained at a mixing ratio of (9:1
Pemodelan Dekomposisi Ammonium Carbamate pada Tekanan Tinggi di Pabrik Urea
Full text linkUrea acts as a nitrogen-based fertilizer to boost crop production and prevent a worldwide hunger crisis. Considering ways to make urea production in existing plants more environmentally friendly, a detailed study has been conducted on the high-pressure stripper, in which the equipment uses intensive energy to decompose ammonium carbamate. The mathematical model was prepared using the two-film theory. The UNIQUAC and Redlich-Kwong equations of state have been used to express nonideality in the NH3-CO2-H2O-urea system under high pressure and temperature circumstances. Due to the lack of transport properties in extreme conditions, the properties were estimated using a theoretical method. The present study obtained the mass-transfer coefficient in dimensionless form and . Moreover, the heat-transfer coefficient was calculated using the Chilton-Colburn analogy. The proposed model result matches what is expected with the commercial plant data. Furthermore, with less than 5% relative deviations, the model deserves significant consideration for any practical use in high-pressure stripper simulatio
CFD Simulation and Efficiency Analysis of Natural Gas Ejector-Booster System
Full text linkNatural gas production involving several gas-well streams with different operating pressure creates a problem, especially for lower-pressure streams. Usually, a compressor unit is installed to enable a lower-pressure stream to tie in the higher-pressure stream. However, this solution requires high costs and investment related to compressor operation. Natural gas ejector provides an alternative, where a higher-pressure stream act as the motive fluid to withdraw the lower-pressure stream. This work aims to simulate the flow inside the ejector using ANSYS Fluent CFD simulator. The model used is validated to published data by other authors. Ejector efficiency is calculated for several operating pressure and ejector geometry: ratio of mixing tube length to diameter. We found that the variation in L/D ratio of mixing tube in current study did not significantly affect the ejector performance. Conversely, it was strongly affected by both motive and suction pressure, where the entrainment ratio is generally higher for lower pressure ratio. On the other hand, the efficiency of ejector process exhibited an optimum behavior, where we obtained the highest efficiency of 26.7% at pressure ratio of 0.1765. Therefore, this result can be utilized as the recommended operating condition
Pengaruh Konsentrasi Polyaluminium Choride (PAC) dan Polydadmac Terhadap Proses Koagulasi dan Flokulasi pada Pengolahan Air Sungai Cengkareng Drain
Full text linkThis study was conducted to determine the effect of the concentration ratio of Polyaluminium Choride (PAC) and Polydadmac coagulants on the coagulation and flocculation processes in river water treatment. The raw water used is raw water that is processed by IPA Taman Kota PT. XYZ namely Cengkareng Drain river water with a turbidity of 19.3 NTU and a pH of 7.22. This study uses the jar test method. The selected variables are variations in the concentration of PAC and polydadmac. The water produced from the jar test was tested for its turbidity and pH. This research was started by sampling raw water, then 1000 ml was put in each glass jar test tool. Then the flocculation process was carried out with a stirring speed of 200 rpm for 2 minutes. Followed by the coagulation process with a stirring speed of 40 rpm for 18 minutes. The process continued with sedimentation for 10 minutes. The optimum dose obtained was the combination of 20 ppm PAC and 0.4 ppm polydadmac with a turbidity value of 1.08 NTU or with a removal efficiency value of 94.40% and a pH value of 7.06
Pengaruh Penambahan Silika Carbon Nanotube dalam Membran sPEEK PVA terhadap Karakteristik Membran pada Sel Bahan Bakar Metanol
Full text linkRecently, the efforts of finding proton exchange membrane (PEM) to replace Nafion membrane which is the important component in direct methanol fuel cell (DMFC) has been done continuously. The aromatic polymer of polyether ether ketone (PEEK) had been developed because this polymer have good chemical, mechanical, and thermal stabilities. High proton conductivity, good mechanical stability, and low methanol permeability are desirable characteristic of the membranes. Composting polymers and/or addition inorganic material is strategies to improve characteristic of membranes. The addition of silica coated carbon nanotubes (SCNTs) would be capable to increase proton conductivity of sPEEK-PVA membrane. This research aims to study the characterization of PEEK membrane combined with PVA and varied silica carbon nanotubes (SCNTs) of 2,5-10% w/w. The experiment result showed that water uptake in the range of 30.7-57.7%, swelling degree in the range of 10-25%, ion exchange capacity (IEC) in the range of 0.48-0.59 meq/g, and methanol permeability in the range of 2.3-4.5 x 10-6 cm2/s. These prepared membranes exhibitted a promising performance even though further investigations should be taken into account
Pemurnian Batuan Emas Ramah Lingkungan Menggunakan Teknik Sink and Flotation dengan Media Tribromometana
Full text linkSeparation of gold from its ore by sink and float method with tribromomethane as a medium is considered economical and environmentally friendly due to the absence of Mercury used in the process. The sink and float technique is based on the specific gravity difference among each constituents. The ore was initially cleaned, washed, crushed and then sieved to obtain various powder sizes, equivalent to 20, 50, and 80 mesh size. The characterization was performed by means of XRD and XRF analysis to determine the initial gold content. Afterward, the ore were processed by using 300 ml tribromomethane, so that two phases, namely the sinking and floating phase, will be formed. Each phase was then undergone weighing, drying and purifying or destructuring by using aqua regia. The results show that the optimum yield of 5.87403% with a gold content (Au) of 0.25976%, was obtained in the sinking phase for 80 mesh size with 3 M tribromomethane concentration and in the floating phase having 0.000001756% with gold content of 0.0000001568%
Kesetimbangan Cair-cair untuk Perhitungan Jumlah Tingkat Mixer Settler pada Pemisahan Konsentrat Neodimium dari Itrium
Full text linkNeodymium (Nd) as raw material for permanent magnet begins to globally develop in various fields. The magnetic quality is far better than other materials such as iron, Al-Ni-Co, Sm-Co, and Sm-Fe-N alloy. However, Nd must be separated from other elements especially yttrium (Y). The presence of Y can reduce the quality of permanent magnet produced since Y has magnetic properties opposite to Nd. One of the separating methods that can be applied is liquid – liquid extraction. Extraction was carried out by using 10% of di-ethyl-hexyl-phosphate (D2EHPA) as the solvent. Information on the phase equilibrium is of importance in the design of large scale extraction system. With a stirring speed of 200 rpm the phase equilibrium conditions were reached after 25 minutes. This study aimed to generate phase equilibrium data and to develop mathematical model to quantitatively describe the phase equilibrium, then to predict the number of extraction stages for the separation. The calculation was done by using stage to stage calculation method based on the mass balance and liquid-liquid equilibrium model proposed. The result shown the number of stages to separate Y from Nd concentrated by using mixer settler is 6 stages with the total recovery of Y is 93%
Analisis Kegagalan Hasil Uji Produk Pelek Aluminium Berdasarkan SNI 1896 : 2008
Full text linkThe aluminium wheel rim product is one of the mandatory SNI products. The wheel rim product is directly related to the safety of the wearers. Some domestic industries have failed to meet the requirements of the SNI 1896: 2008, especially in testing the resistance for impact loads. The purpose of this research was to discover the causes of that failure. Several methods were carried out to find out the causes, namely the metallographic examination, the Scanning Electron Microscopy/Energy Dispersive X-Ray Spectroscopy (SEM/EDS), and the chemical composition. All data would be compared with Original Equipment Manufacturer (OEM) products. The results of the research proved that the too-high Fe content would form a needle structure which had a low interface bond to the aluminium matrix. This condition simplified the spreading of cracks. Based on the results of the chemical composition test and the Al-Si-Fe phase diagram, the intermetallic phase formed was β-AlFeSi, presumably. Also, two types of defect were found, interdendritic shrinkage and less gas porosity with the uneven distribution. The sharp form of the shrinkage defect and β-AlFeSi phase caused the stress concentration would become the initial crack. Consequently, all these conditions caused the low durability of the wheel rim product for the impact load