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All Journal Jurnal Kebidanan Jurnal Penelitian dan Evaluasi Pendidikan Reaktor Jurnal Sains dan Teknologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains AVERROUS: Jurnal Kedokteran dan Kesehatan Malikussaleh Unri Conference Series: Community Engagement Jurnal Kesehatan Amanah Al-'Adad: Jurnal Tadris Matematika Karakter: Jurnal Riset Ilmu Pendidikan Islam
Komalasari Komalasari
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Prarancangan Pabrik Etilen Dari Cracking Nafta Menggunakan Proses Maxene Dengan Disain Alat Utama Reaktor Thermal Cracking Abdul Hafiz Hidayat; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Ethylene is one of the most important petrochemical substances and it’s uses as raw material for various products. The last products made with ethylene include food packaging, toys, food containers, bottles, pipes, antifreeze, carpets, insulation, household appliances, etc. Chemicals made from ethylene to produce end products such as polyethylene, ethylene dichloride, ethylene oxide, ethylbenzene, and vinyl acetate. The ethylene production process is carried out by feeding naphtha into the thermal cracking reactor and a production capacity of 155,000 tons / year is obtained. In the thermal cracking reactor design to break the hydrocarbon chain of naphtha, the feed temperature is 650 oC with a feed flow rate of 70,620.95 kg/hour dimensions of the thermal cracking reactor is 20 ft long, 40 ft wide and 100 ft high including chimney 100 ft. Heat (Q) required is 88,314,298.72 Btu / hour. The amount of Fixed Capital Investment (FCI) is $ 45,879,155.2. The Cost of Working Capital Investment (WCI) is $ 8,096,321,505 and the Total Capital Investment (TCI) cost is $ 53,975,476.7. The Cumulative Cash Ratio (CCR) values for nondiscounted and discounted 10% are 2.2 and 1.21, respectively. The amount of rate of return on investment (ROROI) is 22.7%, Pay Out Time (POT) for non-discounted profitability and discounted 10% profitability are 3.46 years and 6.84 years respectively, the value of the Discounted cash flow rate of return (DCFROR) is 13.55% and every 2% increase in sales and investment (FCI) there is a change in NPV of $ 129,886,499.71. Therefore based on the analysis that has been done it can be concluded that the factory is feasible to build. Keywords: ethylene, naphta, thermal cracking, total capital investment
Proteksi Katodik Dengan Menggunakan Anoda Korban Pada Struktur Baja Karbon Dalam Larutan Natrium Klorida Rahmat Ilham; Komalasari Komalasari; Rozanna Sri Irianty
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Pipe installation of oil and gas processing are located on land or at sea are generally made of carbon steel are susceptible to corrosion by the environment. A system to protect the corrosion of carbon steel is a sacrificial anode cathodic protection. Sample material used is low carbon steel with aluminum and zinc sacrificial anodes.Test condensation used is NaCl at a concentration of 500 ppm, 5.000 ppm, 15.000 ppm and 30.000 ppm then performed by varying the distance between the anode and cathode at a distance of 2 cm,3 cm and 4 cm. The results using the sacrificial anode aluminum and zinc. Where the best results in the sacrificial anode aluminum with carbon steel corrosion rate of 1,08 mpy for NaCl concentration of 500 ppm with the distance between electrodes 2 cm.Keywords: sacrificial anode, NaCl, corrosion rate, cathodik protection.
Proses Densifikasi Pelepah Sawit Menggunakan Gliserol Sebagai Filler Menjadi Bahan Bakar Padat Jimmy Anderson; Zuchra Helwani; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Palm frond has been utilized only for raw source of animal feed, compost and organic fertilizer in plantation area. Oil palm fronds has calorific value of 15,184.05 kJ/kg with a density of 0.1383 g/cm3. Calorific value can be enhanced by densification. By biomass densification aims to increase density and decrease handling issue such as storage and transportation. The aims of this research is to produce solid fuel from palm fronds by densification process, to determine the characteristics of the product and to know the effect of gliserol as filler composition and pressing pressure in the processing by densification and also to know density, calorific value and proximate of product. The composition of gliserol filler used were 15%, 25% and 35%. Pressing pressure used were 50, 75 and 100 bar. The particle size used were < 850 μm. The highest density of the product is 1.07475 gr/cm3 was obtained at gliserol filler composition 35% and pressure 100 bar. The highest calorific value of the product is 16,928.12 kJ/kg was obtained at gliserol filler composition 35% filler and pressure 100 bar. The most affecting factor to caloric value and density are pressing pressure and filler composition.Keywords: calorific value, densification, density, filler, pressing pressure, palm fronds.
Pembuatan Bahan Bakar Padat Dari Pelepah Sawit Menggunakan Proses Torefaksi Pada Variasi Suhu Waktu Torefaksi Rina Maryenti; Komalasari Komalasari; Zuchra Helwani
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Oil Palm Fronds can be used as alternative energy source by using torrefaction process. Oil Palm Fronds has a calorific value of 15439.39 kJ/kg. The calorific value can be increased by torrefaction. Torrefaction is a pre-treatment process of biomass into solid fuel within temperature range of 200 - 300 oC in an inert condition. This research aims to produce solid fuel from oil palm fronds and study the effect of variation in temperature and time torrefaction towards characteristic of solid fuel resulted. Torrefaction of oil palm fronds was using fixed bed horizontal reactor at temperature of 250 - 300 oC and time of 20 - 40 minutes. Product quality resulted was calorific value, mass yield, energy yield and proximate. The result obtained for calorific value in range was 18152.26 - 24060.32 kJ/kg, mass yield was 45.22 - 75.04 %, and energy yield was 70.49 - 88.23 %. Proximate analysis resulted in the form of moisture content was 3.42 - 5.44 %, ash content was 4.67 - 6.89 %, volatile content was 38.63 - 65.34 %, and fixed carbon was 24.55 - 51.06 %.Keywords: calorific value, energy yield, mass yield, oil palm fronds,torrefaction.
Uji Kinerja Fotokatalis Komposit Tio2-Graphene (Cocopas) Untuk Degradasi Fenol Fadhila Ulfa; Desi Heltina; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Phenol is a chemical compound that is one of the hazardous industrial wastes. An excessive concentration of phenol can cause damage in the environment and human life. Phenol removal can be done by photocatalysis process using photocatalyst materials such as titanium dioxide (TiO2).TiO2 was composited with graphene to increase the photocatalytic activity of TiO2. Graphene was modified with cocoPAS before to disperse graphene when composited with TiO2. TiO2-Graphene (cocoPAS) composite was characterized by SEM. Based on the results of characterization, it can be seen that TiO2 particle loaded on the graphene sheet which indicates that the composites have been successfully made. The performance of the TiO2-Graphene (cocoPAS) composite in phenol degradation was tested in a photocatalysis process for 4 hours. A variable in this photocatalysis process is photocatalysis temperature (40 and 50 oC). the most effective TiO2-Graphene (cocoPAS) composite performance was achieved when the photocatalysis temperature is 50 oC, which can degrade phenol by 97% in 4 hours.Keywords: CocoPAS , degradation, photocatalysis, phenol, graphene, titanium dioxide
Pengendalian Korosi Pipa perminyakan Dengan Menggunakan Inhibitor Korosi Teuku Azhari Hassan; Komalasari Komalasari; Ida Zahrina
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Addition of corrosion inhibitor volume into mixing produce oil and water is the methode to protect the inner pipe that can support reliability of the system. The used inhibitor is a kind of organic inhibitor which is generally contain of amin and used to resist corrosion rate for carbon steel which is a pipe material to distribute mixing produce oil and water. The relationship of fluide flow rate and addition of inhibitor volume is very important to understand. One of its parameter is corrosion rate measurement using corrosion coupon. The purpose of this study is to understand the effect of fluide flow rate and addition of inhibitor volume and to find the best condition of corrosion rate in the system. From the experimental results can be concluded that the highest fluide flow rate can increase the corrosion rate. The addition of corrosion inhibitor volume can resist the corrosion rate. The 2,5 gal/day inhibitor was the best inhibitor volume to resist the corrosion rate at variant fluide floe rate, which is 0,3 MPY for 40.000 bbl/day, 0,44 MPY for 60.000 bbl/day, 0,7 MPY for 80.000 bbl/day. Keyword: fluide flow rate, corrosion inhibitor, corrosion rate
Sintesa Coating Kobalt Oksida Dengan Proses Sol-Gel Dip-Coating Sebagai Solar Selective Absorber : Pengaruh Konsentrasi Molar Co Dan Ulang Deposisi Dimas Nofriyan; Amun Amri; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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The Study of the solar absorber with cobalt oxide as the heat absorbing surfaces has been conducted. A dip-coating technique has been used to deposit cobalt oxide coatings on aluminum substrates. A solution of cobalt oxide was prepared in a bath by first mixing Co(NO3)2.6H2O, ethanol and a small amount of propionic acid. The sol prekursor was stirred for 2 hours at room temperature. Pieces of aluminum with size 2x4x0.5cm were cleaned using a solution of phosphoric acid 10% at temperature 50oC for 10 minutes. The coating was synthesized by varying molar percursors 0.1M; 0.2M; 0.3M and the number of dipping-drying cycles 2x, 4x, 6x, 8x and 10x, then annealed at temperature 550 oC for 1 hour. The solar absorptance and emittance were parameters to characterize the performance of the absorber. In practical terms, this generally corresponded to absorbing short wavelengths up to a certain cut-off wavelength (solar spectrum, UV-VIS-NIR), and a low thermal emittance in the IR wavelength region. Consequently, this research attained high performance solar selective absorber of which solar absorptance was 80,14% and emittance was 7,65% on 4 cylcles. Values of selectivity, α/ɛ = 10,48 were obtained. XRD test showed the crystal structure of cobalt oxide, SEM test showed the surface structure of the coating was relatively homogenous and adhesion test showed the adhesion between the coating and the substrate can be categorized as very strong (5B scale ASTM D 3359).Keyword : coating, solar selective absorber, sol-gel dip-coating
Pengaruh Waktu Reaksi pada Sintesis Hidroksiapatit Dari Precipitated Calcium Carbonate (PCC) Terumbu Karang Melalui Proses Hidrotermal Dani Pradana; Yelmida Azis; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Abstract

Coral reefs in Indonesia have a good predicate of around 65%, while damaged coral reefs are around 35%. The damaged coral reefs have not been used optimally, whereas coral reefs have a high content of calcium carbonate which is as much as 78.81%, so that damaged coral reefs can be used as raw material for the synthesis of Hydroxyapatite (HAp). Hydroxyapatite is a bioceramics that can be used as a bone and dental grafting material, catalyst or adsorbent. This study aims to synthesize hydroxyapatite through the formation of Precipitated Calcium Carbonate (PCC) from coral reefs. The research procedure begins with the coral reefs calcination process to form CaO which is then made into PCC with the carbonation method. PCC as a source of calcium was synthesized into hydroxyapatite using a hydrothermal process at 140oC with various reaction times 11, 12, 13, 14, 15, 16, and 17 hours. Hydroxyapatite from the synthesis results is analyzed by X-ray Diffraction (XRD). The results of XRD analysis showed the formation of hydroxyapatite compounds from an angle of 2θ which corresponds to the data (ICDD 01-072-1243). Hydroxyapatite synthesized at a reaction time of 15 hours gave the best results with a hexagonal crystal structure and a crystal size of 49.81141 nm.Keywords : carbonation, hydrothermal, PCC, reaction time.
Proteksi Katodik Dengan Menggunakan Anoda Korban Pada Struktur Baja Karbon Untuk Mengendalikan Laju Korosi Ian Desi Rosalina Situmeang; Komalasari Komalasari; Evelyn Evelyn
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Pipes that are on land or at sea are generally made of steel which is susceptible to corrosion by the environment. The absence of control of the corrosion system metal structures directly related to the environment will be susceptible to corrosion. Prevention of corrosion in water and in the soil can use the principle of cathodic protection. Cathodic protection is a metal surface protection system by passing adequate direct current to the metal surface and converting all anode areas on the metal surface into cathodic regions. This research aims to study the effect of cathodic protection in controlling the corrosion rate of carbon steel, determine the best immersion time between the cathode and anode and choose the type of anode in its use to protect corrosion. The sample material used are low carbon steel with aluminum and zinc sacrificial anodes. The test solution used was a solution of Sodium Chloride with a concentration of 25,000 ppm then carried out by varying the immersion time of the anode and the cathode which were 10 days, 20 days, and 30 days with the distance of the anode to the cathode which was 3 cm. The results of the study using aluminum and zinc sacrificial anodes obtained the best results with a immersion time of 10 days where the corrosion rate of carbon steel protected by aluminum sacrificial anode was 1.596 mpy with an efficiency of 58.182% while the corrosion rate of carbon steel protected by anodes zinc sacrifice of 2.706 mpy with an efficiency of 29.091%.Keywords: carbon steel, cathodic protection, corrosion rate, electrode, sacrificial anode
Pengendalian Korosi Dengan Menggunakan Daun Nanas Sebagai Green Inhibitor Pada Baja ASTM A36 Viona Aulia Rahmi; Komalasari Komalasari; Rozanna Sri Irianty
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Corrosion is a decline quality of a metal because of chemical reaction a metal with its environment. The use of inhibitors is one way of corrosion control on metals, especially on the inside of the pipe. Pineapple leaf extract can be used as a green inhibitor. This study aims to utilize pineapple leaf extract as a green inhibitor about concentration of the inhibitor in controlling the corrosion rate by varying the time of the metal immersion. Extraction is done with a ratio of ethanol: distilled water, which is 1: 4. Research variations were corrosive media (0.1 M H2SO4), inhibitor concentrations (0, 2 gr/L) and immersion time (16, 32 and 48 hours). The method used is the weight loss method. The lowest corrosion rate in 0.1M H2SO4 solution is a concentration of 2 gr/L and a 48 hour immersion time of 20,686 mpy. The highest inhibitor efficiency in 0.1M H2SO4 solution concentration of 2 gr/L and time immersion for 48 hours amounted to 85.48%. It can be concluded that more inhibitors on corrosive media are able to produce low corrosion rates with high inhibition efficiency.Keywords: corrosion rate, inhibition efficiency, inhibitor, pineapple leaf
Co-Authors A. Fadli Abdul Hafiz Hidayat Abdul Rahman Marwis Karim Abdullah Agung Hayyuka Adela Shofia Addabsi Adha Widoni Agung Prabowo Ahmad Fadli Al Qarni Putra Amun Amri Astri Gusrita Asyraful Akbar Ayu Annisya Tri Adriana Boy Jansen Roberto Manik d R. Sari Dani Pradana Desi Heltina Dhamala Shobita Chandra Dimas Nofriyan Drastinawati Drastinawati Edy Saputra Eferius Mendrofa Evelyn Evelyn Fachry Abda El Rahman Fadhila Ulfa Farhan Hidayatullah Farida Farida Fauzia Mulyana Fikri Miftahul Shiddiq Firman Tampubolon fitriyanti fitriyanti Getra Anugrah Hadrian Yonas Sebastian Napitupulu Harfiah Faradila Ian Desi Rosalina Situmeang Ida Zahrina Ilham Habib Ines Indriyani Jimmy Anderson Kartono Kartono Kendro Prasetyo M. S. Amir Mardianti Mardianti Mastiar Krisdayanti Sinaga Muhammad Alfin Khairullah Muhammad Khairil Amri Muhammad Rivaldiansyah Mustika Canra Oding Sitorus Paian Harianja Primadevi, Inggit Putri Rahmadani Qurotullaili Qurotullaili Rahmat Ilham Rajuddin Rajuddin rima siburian Rina Maryenti Riona Sanjaya Roin Nuretha Rozanna Sri Irianty Roziana Roziana Saefudin Zuhri Siska Siska Siti Chotijah Sri Rezeki Muria Sry Utami Pardede Syelvia Putri Utami Teuku Azhari Hassan Tubagus Maruf Ansori Vina Sutratul Putri Viona Aulia Rahmi Wahyu Hidayat Yelmida Azis Zuchra Helwani Zultiniar Zultiniar