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Zuchra Helwani
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Journal : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Perancangan Algoritma Komputasi Heat Exchanger Network (HEN) Arini Puspita Ramadhanti; Zuchra Helwani; Hari Rionaldo
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Heat integration is a method used to increase energy efficiency in a circuit that process with utilizing the energy potential of other process units. The utilization of the energy potential ofother process units can be done with the installation of the Heat Exchanger Network (HEN) which aims to save usage utility either steam or cooling water, so that the production cost can beminimized. Design HEN need analysis, start from the analysis of the minimum energy efficient in a network that is calculate the Maximum Energy Recovery (MER) targets, design heat exchanger network system that is network design. In this research, the MER calculation using the temperature interval and network design using the pinch method. Goals at this research is to generate algorithm computation and tools computation for design HEN. Algorithm computation of MER calculation with temperature interval method consist of input, problem tablecomputation, cascade diagram computation and output. Algorithm computation of network design with pinch method consist of identification the flow on hot side and cold side, identification sream matching at hot side and cold side, calculation of heat (Q) of heat exchangers, analysis heat (Q) of heat exchanger, and analysis hot utility ( H Q ), cold utility, and(QC ) dan T . At MER calculation was obtained minimum hot utility ( hmin Q ), minimum cold utility ( cmin Q ), and pinch temperature ( pinch T ). Sythesis HEN was displayed in Grid Diagram. Design algorithm of computation was simulated by Java programming that is displayed by Graphical User Interface (GUI).Kata kunci : heat integration, Heat Exchanger Network (HEN), Maximum Energy Recovery (MER), network design, pemoraman Java. 
Pembuatan Biodiesel Dari Minyak Sawit Off-Grade Menggunakan CaO/Fly Ash Sebagai Katalis Pada Tahap Transesterifikasi Viqrie Wahyudi; Zuchra Helwani; Edy Saputra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Indonesia needs the development of renewable energy. Biodiesel is one of renewable energy that formed as liquid fuel and has same property with petrodiesel. Biodiesel is able to be synthesis from off-grade palm oil using CaO/fly ash as catalyst in transesterification process. Employing fly ash as support in CaO has a good impact due to environmentally friendly, good economic potential and the utilization of Ca compound in fly ash. Biodiesel production in this study aims is to see the influence of reaction temperature, molar ratio of methanol and oil and concentration of CaO/fly ash towards biodiesel yield. The process was conducted through reaction of esterification and followed by transesterification reaction. Processing the data in this study was conducted by Response Surface Methodology (RSM) using Design Expert 7.0 program which is experimental design determined by Central Composite Design (CCD) which consists of three variables. The highest result of biodiesel yield was 59,34% at 70oC reaction temperature, molar ratio of methanol : oil 6 : 1 and catalyst concentration of CaO/fly ash 6%-w. Biodiesel characteristics like as density, kinematic viscosity, acid value and flash point has been appropriate by Indonesian biodiesel standard. The most significant process condition affecting the yield of biodiesel was catalyst concentration.Keywords: biodiesel, off-grade palm oil, catalyst, fly ash, transesterification
Preparasi Katalis CaO/Fly Ash Dan Penggunaannya Pada Reaksi Transesterifikasi Minyak Sawit Off-Grade Menjadi Biodiesel Robi Maulana; Zuchra Helwani; Edy Saputra
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

A palm fly ash supported calcium oxide (CaO) catalyst was prepared and used in transesterification from off-grade palm oil for biodiesel production. The catalyst synthesized by loading CaO of calcium nitrate tetrahydrate (Ca(NO3)2.4H2O) into fly ash through impregnation method. The optimum catalyst preparation conditions were determined by influence of calcination temperature and weight ratio of Ca(NO3)2.4H2O and fly ash. Catalyst with highest catalytic activity was achieved when calcined at 800 oC and proportion of Ca(NO3)2.4H2O to fly ash is 80:20. Under the conditions of oil : methanol ratio of 1:6, catalyst dosage of 6 wt% and temperature of 70 oC for 2 h, the biodiesel yield reaches to 71,77%. CaO, SiO2, Ca(OH)2 and Ca2SiO4 were found in the catalyst through X-ray diffraction (XRD) while the basic strength of the catalyst H_ > 9,3 was determined by using Hammett indicator phenolphthalein. Surface area of the developed catalyst is 24,342 m2/g through Brunauer-Emmett-Teller (BET). Characteristics of biodiesel such as density, kinematic viscosity, acid value, flash point has been matched with standard for biodiesel specification of Indonesia.Keywords: calcium oxyde, catalyst, fly ash, biodiesel, off-grade palm oil, impregnation,calcination, transesterification.
Sintesis Biodiesel Dari Minyak Nyamplung (Calophyllum Inophyllum) Menggunakan Katalis Heterogen Nh4-Geopolimer Ganis Kharisma Wiranti; Edy Saputra; Zuchra Helwani
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

Biodiesel is an alternative energy to replace fossil fuels that have the advantage of producing less gas emissions and higher combustion efficiency. Biodiesel is produced by transesterification reaction of vegetable oil. During the process of making biodiesel usually used NaOH or KOH as homogeneous catalyst which has the disadvantage of formation side products such as soaps and complexity of the separation of catalyst because having the same phase. Therefore, in this study biodiesel was synthesized from calophyllum inophyllum oil using geopolymer catalyst. Geopolymer was synthesized by mixing sodium silicate, metakaolin, sodium hydroxide, aquadest, and ammonium nitrate. The process variables are weight of oil 50 grams, stirring rate 400 rpm, reaction time 120 minutes, and temperature of 65 oC, with catalyst 3% (w/w) and mole ratio of methanol:oil 1:12. The yield of biodiesel 94,14% with density 881,17 kg/m3, kinematic viscosity 3,66 mm2/s, the acid number of 0,25 mg-KOH/g biodiesel, and the flash point 146°C respectively accordance with the standards of Indonesian biodiesel (SNI 7182:2015). Keywords: biodiesel, callophyllum inophyllum oil, geopolymer, transesterification, yield
Hidrodeoksigenasi Pirolisis Kayu Ketapang (Terminalia Catappa L) Menjadi Bio-Oil Menggunakan Katalis Mo/Lempung Andi Mulya Adha; Syaiful Bahri; Zuchra Helwani
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Bio-oil can be produced by hydrodeoxygenation pyrolysis of terminalia catappa wood using Mo/Clay catalyst. Objective of this research is to produce bio - oil from catappa wood using hydrodeoxygenation pyrolysis method, determine the effect of hydrodeoxygenation temperature and percentage of Mo/clay catalyst to the yield of bio - oil produced, as well as determine the effect of hydrodeoxygenation pyrolysis on physical properties and chemical properties of bio - oil produced. Hydrodeoxygenation pyrolysis process was carried out using catappa woody biomass 50 grams with -100 + 200 mesh sieve size, silinap 500 ml, variation Mo / clay catalyst to the biomass amounted to 0 %; 0,5 %; 1,5 % and 2,5 % by weight to biomass and hydrodeoxygenation pyrolysis temperature variations are: 300, 310, 320, and 330°C. Results of this study produced bio - oil yields the largest on the use of Mo / clay catalyst 1,5 % by weight to biomass and temperature of 320°C which is 65,477 %. Characterization of physical properties of bio - oil measured of density of 0,909 g /ml, 1,797 cSt viscosity, acid number 30,089 mg NaOH / gram sample, 48 °C flash point and calorific value 44,725 MJ / kg. Respectively the characterization of the chemical properties of bio - oil using Gas Chromatography - Mass Spectroscopy (GC - MS) obtained some dominant chemical components such as: (2,4,4-trimethyl, 2-pentene), (2,2,4,4-tetramethyl, Pentane), (3 (3,3-dimethyl butyl), Cyclohexanone), (5,5-dimetyl, 2-Hexene), and (1-propene, 2-methyl, tetramer). Keywords: bio – oil, catappa wood, hydrodeoxygenation pyrolysis, Mo/clay catalyst
Sintesis Biodiesel Dari Low Grade Crude Palm Oil (LGCPO) Menggunakan Katalis Sulfonated Carbon Nanospheres@Ferromagnetic (HSO3-CNSS@Fe3O4) Heru Kristianto; Edy Saputra; Zuchra Helwani
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
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Biodiesel is an alternative fuel that is environmentally friendly. Catalysts is commonly used in the production of biodiesel is strong base catalysts which is difficult to separate from the product because it has the same phase as the reactant. Therefore, it is necessary to develop catalyst technology that is more economical, easy to implement, and environmentally friendly, such as sulfonated carbon nanospheres@ferromagnetic catalyst. The catalyst was synthesized by reacting granulated sugar, FeCl2, FeCl3, and the addition of ammonia through a hydrothermal carbonization process for further sulfonated using 98% concentrated sulfuric acid. The catalyst produced has a nanospherical shape with a size of 0.08-0.16 μm. The catalyst is then used in the transesterification reaction to produce biodiesel. Optimum condition is reached at process variables LGCPO weight of 50 grams, stirring speed of 400 rpm, reaction time of 120 minutes, and temperature of 60 oC, with catalyst concentration of 1.5% (w/w) and molar ratio methanol:oil 1:9. The yield of biodiesel is 96.62% with density 878.67 kg/m3, viscosity 3.28 mm2/s, the acid number of 0.29 mg-KOH/g biodiesel and the flash point 127°C comply with the SNI standards (SNI 7182: 2015). Keywords: Biodiesel, carbon nanosphere, LGCPO, transesterification, yield
Pengaruh Kondisi Proses Terhadap Kuat Tarik Pulp Pada Pembuatan Pulp Rumput Perimping Dengan Pelarut Organik Asam Formiat Edi Susanto; Zuchra Helwani; Zulfansyah Zulfansyah
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Perimping grass is one of lignocellulosic material which has not been fully utilized, so it is potential to be used as raw material for pulping which will provide economic value added. Organosolv pulping is the process of pulp making using organic solution. The objectives of this research is to study effect of the process conditions on tensile index. Effect of the process conditions were studied by Response Surface Methodology (RSM) with Central Composite Design (CCD). The experiment pulping is carried out at the boiling temperature of liquor at atmospheric pressure, with 40 grams of perimping grass using formic acid (concentrations of 60%, 70%, and 80%), reaction time (60 minutes, 120 minutes, and 180 minutes), liquid to solid ratio (10/1, 15/1 , And 20/1 b/b), with HCl catalyst 0.1% wt. The result pulp of the perimping grass for tensile index is 659.3-2.1149 N m/g. The variable interaction (concentration of formic acid and reaction time) is a significant factor to the pulp tensile index.Keywords: formic acid, organosolv pulping, perimping grass, RSM, tensile index
Sintesis Hidroksiapatit Melalui Precipitated Calcium Carbonate (PCC) Cangkang Kerang Darah Dengan Metode Hidrotermal Pada Variasi pH Dan Waktu Reaksi Ari Wibowo Harahap; Zuchra Helwani; Zultiniar Zultiniar; Yelmida Yelmida
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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Hydroxyapatite Ca10(PO4)6(OH)2 is a calcium phosphate compound which is a bioactive ceramic material with high bioafinitas, used as bone implants, adsorbents and catalysts. Synthesis of hydroxyapatite can be made by using material which is rich of CaCO3 like PCC blood calm shell with a composition of 95.5% CaCO3. In this research, PCC blood calm shell which has calcium source was synthesized to HAp by hydrothermal process. pH of the reaction (10, 11, 12) and time reaction (22,24,26 hours) was be varied. The outcome of synthesis was characterized by using FTIR, XRD, SEM. The results of FTIR analysis, synthesis of HAp with hydrothermal method showed the formation of hydroxyapatite in the presence of peaks PO43- dan OH-. The highest peak is obtained at pH 10,11,12 at time reaction of 26 hours. XRD diffraction results in hydroxyapatite get the highest crystallinity at pH 12 at time reaction 26 hours with a hexagonal crystal structure and produce a more pure hydroxyapatite. SEM results showed morphology with clots and irregular round shape.Keywords : PCC blood calm shell, pH, time reaction, hydroxyapatite, hydrothermal method.
Modifikasi Kulit Telur Ayam Dan Serbuk Besi Sebagai Katalis untuk Reaksi Transesterifikasi Minyak Sawit Off Grade Menjadi Biodiesel Delvi Yolanda; Zuchra Helwani; Edy Saputra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Eggshells modificated of solid base catalyst through calcination, hydration, dehydration methods with iron powder through impregnation method to load calcium oxide with eggshells as precursor. Effect of dehydration temperature and time on the catalytic performance were studied. The catalyst with the highest activity is obtained when the dehydration temperature of 600 °C and the dehydration time of 2 hours under transesterification reaction conditions of a molar ratio of methanol/oil 10:1, catalyst dosage of 1% by weight, temperature of 70 °C for 2 hours with yield biodiesel results reached 90%.Keywords: biodiesel, calcination, calcium oxide, catalysts, dehydration, hydration, impregnation, iron powder, transesterification.
Modifikasi Kulit Telur Puyuh Dan Serbuk Besi Menjadi Katalis CaO/Serbuk Besi Untuk Reaksi Transesterifikasi Minyak Sawit Off Grade Produksi Biodiesel Vandhe Melsa Sembiring; Zuchra Helwani; Rozanna Sri Irianty
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

Biodiesel can be synthesized from palm oil off grade using a CaO / iron powder catalyst in the transesterification stage. This study aims to produce biodiesel from low-quality raw materials and determine the effect of the process by looking at the effect of process conditions such as dehydration temperature and dehydration temperature on biodiesel yield. The process of making biodiesel is carried out by esterification and transesterification reactions. The catalyst with the highest catalytic activity was obtained at a dehydration temperature of 600°C and dehydration time for 3 hours with the condition of the transesterification reaction at 10:1 molar ratio of methanol/oil, catalyst concentration of 1% -b oil, reaction temperature of 70° C for 2 hours with yield biodiesel reached 90%. Keywords: biodiesel, CaO, off grade palm oil, iron powder, transesterification.
Co-Authors Abdullah Syafi’i Adi Maulana Putra Ahmad Fadli Al Qohyum Fernando Andi Mulya Adha Andreas Sahat Parsaulian Andry Sutanto Anna Apryana Ari Wibowo Harahap Arief Maulana Ilham Arini Puspita Ramadhanti Ayu Naluri Bahruddin Bettry Rifani Dedi Meier Silaban Delvi Yolanda Desi Ivo Andri Ari Desly Fadilla Simbolon Dwi Yuni Ernawati Edi Susanto Edy Saputra Eferius Mendrofa Febrian Adhitya Febryanto Febryanto Firman Tampubolon Fitra Annisa Ganis Kharisma Wiranti Gusti Ayu Nurjanah Hari Rionaldo Heriza Saputri Heru Kristianto Holyness Nurdin Singadimedja Ida Zahrina Jhon Fery Marihot Tua S Jimmy Anderson Khairat Khairat Komalasari Komalasari M. Wahyu Nugraha Mery Christina Mia Afriyenti Mohd Fajri Amrullah Monika Shecilia Muh. Fadlan Alfuadi Muhammad Gus Iqbal Al-Pakningi Muhammad Rahman Muhammad Rifki Aulia Rahman Mustapa Ardi Nirmala Sari Nur Khairiati Qurotullaili Qurotullaili Ramdhani Asywal Ricfan Anggriawan Rina Maryenti Rio Nanda Novendra Rivo Fernando Romie Jhonnerie Romy Romy Rozanna Sri Irianty Sherly Oktarizona, Shinta Anggraini Silvia Reni Yenti Solly Aryza Sri Helianty Syafrima Wahyu SYAIFUL BAHRI Trisuciati Syahwardini Triyana Defi Vandhe Melsa Sembiring Viqrie Wahyudi Walter Valentino Sinaga Warman Fatra, Warman Wenny Susanty Widya Yoesepha Yelmida Azis Z Zulfansyah Zultiniar Zultiniar